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Full text of "Montana Plumbing Code"

24.301.301 INCORPORATION BY REFERENCE OF UNIFORM PLUMBING CODE 
(1) The Department of Labor and Industry adopts and incorporates by reference the 
Uniform Plumbing Code, 2006 edition, referred to as the Uniform Plumbing Code, unless 
another edition is specifically stated, together with the following appendix chapters and 
amendments: 

(a) Appendix A, Recommended Rules for Sizing the Water Supply System is adopted. 

(b) Appendix B, Explanatory Notes on Combination Waste and Vent Systems is 
adopted. 

(c) Appendix D, Sizing Stormwater Drainage Systems is adopted. 

(d) Subsection 103.1.3, is amended with the addition of the following language: The 
requirements for who must be licensed to perform plumbing work is regulated by Title 37, 
chapter 69, MCA. 

(e) Subsections 102.3, 103.1, 103.2, 103.3, 103.4, 103.5, and 103.6 will be left as is for 
use by local governments (i.e., municipalities and counties) but will not be used by the 
department and the state of Montana. For the purposes of enforcement by the department, 
these subsections are replaced with provisions of Title 50, chapter 60, part 5, MCA. 

(i) No permit is required for any minor replacement or repair work, the performance of 
which does not have a significant potential for creating a condition hazardous to public 
health and safety. 

(ii) No permit is required where the installation is exempt under the provisions of 
50-60-503 or 50-60-506 , MCA. 

(iii) The requirements for permits do not apply to regularly employed maintenance 
personnel doing maintenance work on the business premises of their employer unless 
work is subject to the permit provisions of these rules. 

(iv) Factory-built buildings covered by an insignia issued by the department need not 
have a plumbing permit for the construction of the unit; however, a permit will still be 
required for on-site work, as provided for in these rules. 

(f) Delete Table No. 1 .1 - PLUMBING PERMIT FEES and replace with the following 
schedule: 

(i) for issuing each permit $20* 

(ii) for each plumbing fixture 7 

(iii) water service - domestic or commercial 7 

(iv) for each building sewer and each trailer park sewer 11 

(v) storm drains and storm drainage 7 

(vi) for each water heater 7 

(vii) for each industrial water pretreatment interceptor, 

including its tray and vent, excepting kitchen type grease 

interceptors functioning as fixture traps 7 

(viii) for installation, alteration, or repair of water piping 

and/or water treatment equipment 7 

(ix) for repair or alteration of drainage or vent piping 7 

(x) for each lawn sprinkler system and fire protection 

system or any one meter, including backflow protection devices therefore 7 

(xi) for vacuum breakers or backflow protective devices 

on tanks, vats, etc., or for installation on unprotected plumbing 

fixtures, including necessary water piping 

(A) one to four 7 

(B) five or more, each 2 

(xii) requested plumbing inspection fee 

(provided that such service is not in excess of one hour in duration. 



and then $25 for each 30 minutes or fractional part thereof 

in excess of one hour. Travel and per diem will be charged 

as per the state of Montana's existing rate for these items) 45 

(xiii) reinspection (provided the $30 does not exceed the 

original permit fee, in which case the original fee will be charged) 30 

(xiv) for each gas piping system of one to four outlets 7 

(xv) for each gas piping system of five or more, per outlet 2 

(xvi) for each medical gas piping system serving 

one to five inlet(s)/outlet(s) for a specific gas 50 

(xvii) for each additional medical gas piping inlet(s)/outlet(s) 5 

*except for replacement of water heaters. 

(g) Section 218, Definition of Plumbing System, is amended to read: "Includes all 
potable water supply and distribution pipes, all plumbing fixtures and traps, all drainage 
and vent pipes, building drains and building sewers, including their respective joints and 
connections, devices, receptacles, and appurtenances within the property line of any 
premises, and includes water heaters and vents for the premises." 

(h) Subsection 405.2, Prohibited Urinals, is amended by adding the following: 
"Exception: Nonwater supplied urinals may be installed and shall be maintained in 
accordance with manufacturer's installation instructions and required maintenance 
schedule. A properly sized drain, vent, and water supply line, permanently capped, shall 
be installed for future use in the event the owner decides or is ordered to replace the 
nonwater supplied urinal with a water supplied urinal." 

(i) Table 4-1, Minimum Plumbing Facilities, is deleted and replaced with ARM 
24.301.351 Minimum Required Plumbing Fixtures. 

G) Subsection 508.14, paragraph one is amended to read as follows: "Gas utilization 
equipment, or any equipment that generates a glow, spark, or flame, in residential garages 
and in adjacent spaces that open to the garage and are not part of the living space for a 
dwelling unit shall be installed so that all burners, burner-ignition devices, and heating 
elements are located not less than 18 inches (450 mm) above the floor unless listed as 
flammable vapor ignition resistant." 

(k) Delete Subsection 603.3.3. 

(I) Subsection 603.1, Approval of Devices or Assemblies, is amended to read as 
follows: "Before any device or assembly is installed for the prevention of backflow, it shall 
have first been approved by the authority having jurisdiction. Devices or assemblies shall 
be tested for conformity with recognized standards or other standards acceptable to the 
authority having jurisdiction, so long as those standards are consistent with the intent of 
this code. All devices or assemblies installed in a potable water supply system for 
protection against backflow shall be maintained in good working condition by the person or 
persons having control of such devices or assemblies. If found to be defective or 
inoperative, the device or assembly shall be repaired or replaced. No device or assembly 
shall be removed from use or relocated or other device or assembly substituted, without 
the approval of the authority having jurisdiction." 

(m) Subsection 603.4.10, is amended with the addition of the following language: 
"Boiler feed lines, in single family dwellings on their own private well, may be protected 
with a dual check valve with intermediate atmospheric vent when a nontoxic transfer fluid 
is utilized in the boiler." 

(n) Subsection 604.1, Materials, is amended to read as follows: 

(i) "Water pipe and fittings shall be of brass, copper, cast iron, galvanized malleable 
iron, galvanized wrought iron, galvanized steel, or other approved materials." 



(ii) Cast iron fittings used for water need not be galvanized if over 2 inches (51 mm) in 
size. 

(iii) Asbestos-cement, PB, CPVC, RE, PEX, PEX-AL-PEX or PVC water pipe 
manufactured to recognized standards may be used for cold water distribution systems 
outside a building. These approved outside cold water piping materials except for 
asbestos-cement may extend to a point within the foundation perimeter of the building 
provided that the piping is buried a minimum of 12 inches, the piping is contained within a 
protective sleeve where it passes through concrete construction and the piping does not 
extend for more than 24 inches out of the ground at such point where it connects to 
approved interior cold water piping material. 

(iv) All materials used in the water supply system, except valves and similar devices 
shall be of a like material, except where otherwise approved by the administrative 
authority. 

(v) Table 6-4 is amended to add the following: "PB is allowed for hot and cold water 
distribution." 

(o) Subsection 604.2, the exception is amended to read as follows: Exception: Type M 
copper tubing may be used for water piping when piping is above ground in, or on, a 
building. 

(p) Subsection 701.1 is amended to read as follows: "Drainage piping shall be cast 
iron, galvanized steel, galvanized wrought iron, lead, copper, brass. Schedule 40 ABS 
DWV, Schedule 40 ABS DWV cellular core. Schedule 40 PVC DWV, Schedule 40 PVC 
DWV cellular core, extra strength vitrified clay pipe, or other approved materials having a 
smooth and uniform bore, except that: 

"(1) Galvanized wrought iron or galvanized steel pipe shall not be used underground, 
and it shall be kept at least six inches (152 mm) above ground. 

"(2) ABS and PVC DWV piping installations must be installed in accordance with IS 5, 
IS 9 and Chapter 15 "Firestop Protection for DWV and Stormwater Application." Except for 
individual single family dwelling units, materials exposed within ducts or plenums shall 
have a flame-spread index of not more than 25 and a smoke-developed index of not more 
than 50, when tested in accordance with the Test for Surface-Burning Characteristics of 
the Building Materials (See the building code standards based on ASTM E-84 and 
ANSI/UL723). 

"(3) Vitrified clay pipe and fittings shall not be used above ground or where pressurized 
by a pump or ejector. They shall be kept at least 12 inches (305 mm) below ground. 

"(4) Copper tube for drainage and vent piping shall have a weight not less than that of 
copper drainage tube type DWV." 

(q) Subsection 610.8, second paragraph, is amended to read as follows: No building 
supply pipe shall be less than 3/4 inch (19.1 mm) in inside diameter. 

(r) Subsection 701.1.4, is amended with the addition of the following language: Copper 
tube for underground drainage and vent piping shall have a weight of not less than that of 
copper tube type L. 

(s) Subsection 707.4, first paragraph, is amended to read as follows: Each horizontal 
drainage pipe shall be provided with a cleanout at its upper terminal and each run of 
piping, which is more than 50 feet in total developed length, shall be provided with a 
cleanout for each 50 feet, or fraction thereof, in length of such piping. 

(t) Section 708.0, Grade of Horizontal Drainage Piping, is amended to read as follows: 
Horizontal drainage piping shall be run in practical alignment and a uniform slope of not 
less than 1/4 of an inch per foot or 2 percent toward the point of disposal provided that, 
where it is impractical due to the depth of the street sewer or to the structural features or to 
the arrangement of any building or structure to obtain a slope of 1/4 of an inch per foot or 2 



percent, any such pipe or piping 2 inches or larger in diameter may have a slope of not 
less than 1/8 of an inch per foot or 1 percent. 

(u) Subsection 710.1, is amended to read as follows: "Where a fixture is installed on a 
floor level that is lower than the next upstream manhole cover of the public or private 
sewer serving such drainage piping may be protected from the backflow of sewage by 
installing an approved type backwater valve. Fixtures on floor levels above such elevation 
shall not discharge through the backwater valve." 

(v) Subsection 718.1, the exception is amended to read as follows: Exception: Where it 
is impractical, due to the depth of the street sewer or to the structural features or to the 
arrangement of any building or structure, to obtain a slope of 1/4 of an inch per foot, any 
pipe or piping 3 inches or larger in diameter may have a slope of 1/8 of an inch per foot 
and any such pipe or piping 8 inches in diameter or larger may have a slope of 1/16 of an 
inch per foot. 

(w) Subsection 903.2.1 is amended to read as follows: "Copper tube for underground 
drainage and vent piping shall have a weight of not less than that of copper tube Type L." 

(x) Subsection 906.1, is amended to read as follows: Each vent pipe or stack shall 
extend through its flashing and shall terminate vertically not less that 12 inches above the 
roof nor less than 1 foot from any vertical surface. 

(y) Subsection 906.3, is amended to read as follows: Vent pipes shall be extended 
separately or combined, of full required size, not less than 12 inches above the roof or fire 
wall. 

(z) Subsection 906.7, is amended to read as follows: Frost and Snow Closure: Where 
frost or snow closure is likely to occur in locations having a minimum design temperature 
below zero degrees Fahrenheit vent terminals shall be a minimum of 3 inches in diameter, 
but in no event smaller than the required vent pipe. The change in diameter shall be made 
inside the building at least 1 foot below the roof and terminate not less than 12 inches 
above the roof, or as required by the administrative authority. 

(aa) Section 908.0, is amended to read as follows: Wet venting. 

(ab) Subsection 908.1, is amended to read as follows: 

(i) Wet venting is limited to drainage piping receiving the discharge from the trap arm of 
one and two fixture unit fixtures that also serves as a vent for not to exceed four fixtures. 

(ii) All wet vented fixtures shall be within the same story; provided, further, that fixtures 
with a continuous vent discharging into a wet vent shall be within the same story as the 
wet vented fixtures. 

(ac) Subsection 908.2, is amended to read as follows: The piping between any two 
consecutive inlet levels shall be considered a wet vented section. Each wet vented section 
shall be a minimum of one pipe size larger than the required minimum waste pipe size of 
the upper fixture or shall be one pipe size larger than the required minimum pipe size for 
the sum of the fixture units served by such wet vented section, whichever is larger, but in 
no case less than 2 inches. 

(ad) Chapter 12, Fuel Piping, is deleted and replaced with the International Fuel Gas 
Code. 

(ae) Chapter 13, Health Care Facilities and Medical Gas and Vacuum Systems, is 
deleted. In lieu of Chapter 13, the Department of Labor and Industry adopts and 
incorporates by reference the National Fire Protection Association's Standard NFPA99C, 
Gas and Vacuum Systems, 2005 edition, referred to as NFPA99C, unless a different 
edition date is specifically stated, as the standard for the installation of medical gas and 
vacuum systems. The requirements of this rule shall not be construed as to replace or 
supersede any additional requirements for testing and certification of medical gas and 
vacuum systems, including independent third party certification of systems, as may be 



applicable. NFPA99C is a nationally recognized standard setting forth minimum standards 
and requirements for medical gas and vacuum systems. A copy of NFPA 99C may be 
obtained from the National Fire Protection Association, One Batterymarch Park, P.O. Box 
9101, Quincy, MA 02269-91 01. 

(2) The purpose of this code is to provide minimum requirements and standards for 
plumbing installations for the protection of the public health, safety, and welfare. The 
Uniform Plumbing Code is a nationally recognized model code setting forth minimum 
standards and requirements for plumbing installations. A copy of the Uniform Plumbing 
Code may be obtained from the Department of Labor and Industry, Bureau of Building and 
Measurement Standards, P.O. Box 200517, Helena, MT 59620-0517, at cost plus postage 
and handling. A copy may also be obtained by writing to the International Association of 
Plumbing and Mechanical Officials, 20001 South Walnut Drive, Walnut, CA91789. 

History: 50-60-203 . 50-60-504 . 50-60-508 . MCA; [MP , 50-60-201 . 50-60-203 . 
50-60-504 . 50-60-508. MCA; NEW , 1978 MAR p. 380, Eff. 3/25/78; AMD , 1978 MAR p. 
1480, Eff. 10/27/78; AMD , 1979 MAR p. 1662, Eff. 12/28/79; AMD , 1981 MAR p. 1052, 
Eff. 9/18/81; AMD, 1982 MAR p. 2170, Eff. 12/31/82: TRANS .from Dept. of Admin. , Ch. 
352, L. 1985, Eff. 7/1/85; AMD , 1986 MAR p. 106, Eff. 1/31/86; AMD , 1989 MAR p. 476, 
Eff. 4/28/89; AMD , 1992 MAR p. 1133, Eff. 5/29/92: AMD . 1994 MAR p. 299, Eff. 2/11/94; 
AMD , 1996 MAR p. 420, Eff. 2/9/96; AMD , 1997 MAR p. 44, Eff. 1/17/97; AMD , 1997 
MAR p. 2061, Eff. 11/18/97: AMD , 1998 MAR p. 2563, Eff. 9/25/98: AMD , 1999 MAR p. 
1885, Eff. 10/1/99; AMD , 2000 MAR p. 3168, Eff. 11/10/00: TRANS .from Commerce, 
2001 MAR p. 2301: AMD , 2004 MAR p. 571, Eff. 3/12/04; AMD , 2006 MAR p. 567, Eff. 
2/24/06; AMD , 2007 MAR p. 112, Eff. 1/26/07. 



An American National Standard 

lAPMO/ANSI UPC 1-2006 



2006 
UNIFORM 
PLUMBING 
CODE 



lAPMO. 




® 



^ 



.^ tf^^'lona /s,. 



v*. 



ANSI 




MCAA 






WORLD PLUMBING 
COUNCIL 



"^^^^^^I^^K^^"^ 




REVISION MARKINGS 



Code changes from the 2003 edition are marked in the margins as follows: 



An arrow denotes a deletion. 



I A vertical denotes a change. 



TiA TIA indicates that the revision is the result of a Tentative Interim Amendment 

^,, For further information on tentative interim amendments see Section 5 of the lAPMO 

TIA 

jiA Regulations Governing Committee Projects available at http://www.iapmo.org/iapmo/ 

TIA code_rules-regs.html 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



A reference in brackets [ ] following a section or paragraph indicates material that has 
been extracted from another document. This reprinted material is not the complete and 
official position of the National Fire Protection Association on the reference subject which 
is represented by the standard in its entirety. Text which has been extracted pursuant to 
lAPMO's Extract Guidelines is denoted with the use of "NFPA" in the margin. This text 
has not been fully processed by lAPMO in accordance with ANSI's public announcement 
consensus requirements for an American National Standard (ANS) nor approved by 
ANSI's Board of Standards Review, but will be fuUy processed in accordance with those 
requirements as part of the next revision cycle for this document. 



Information on referenced publications can be found in Chapter 14. 

All pressures used in this code are gauge pressures imless otherwise indicated. 



Copyright © 2006 

by 

International Association of Plumbing and Mechanical Officials 

All Rights Reserved 

No part of this work may be reproduced or recorded in any form or by any means, 
except as may be expressly permitted in writing by the publisher. 

Twenty-Fourth Edition 

First Printing, January 2006 

Second Printing, April 2006 

Third Printing, May 2006 

Fourth Printing, January 2007 

Fifth Printing, June 2007 
Sixth Printing, October 2007 

ISSN 0733-2335 

Published by the International Association of Plumbing and Mechanical Officials 

5001 E. Philadelphia Street • Ontario, CA 91761-2816 - USA 

Main Phone: (909) 472-4100 • Main Fax: (909) 472-4150 




897-M 



2006 UPC Foreword 

The advantages of a uniform plumbing code adopted by various local jurisdictions has long been recognized. 
Disorder in the industry as a result of widely divergent plumbing practices and the use of many different, 
often conflicting, plumbing codes by local jurisdictions influenced the Western Plumbing Officials Association 
(now the International Association of Plumbing and Mechanical Officials [lAPMO]) to form a committee of 
plumbing inspectors, master and journeyman plumbers, and sanitary and mechanical engineers, assisted by 
public utility companies and the plumbing industry to create a basic plumbing document for general use. The 
product of this effort, the first edition of the Uniform Plumbing Code'^^ (UPC^"^) was officially adopted by 
lAPMO in 1945. The widespread use of this code over the past five decades by jurisdictions throughout the 
United States and internationally is testament to its merit. 

With the publication of the 2003 Edition of the Uniform Plumbing Code, another significant milestone was 
reached. For the first time in the history of the United States, a plumbing code was developed through a true 
consensus process. The 2006 edition represents the most current approaches in the plumbing field and is the 
second edition developed under the ANSI consensus process. Contributions to the content of the code were 
made by every segment of the built industry, including such diverse interests as consumers, enforcing 
authorities, installers /maintainers, insurance, labor, manufacturers, research/standards/testing laboratories, 
special experts, and users. 

The UPC is designed to provide consumers with safe and sanitary plumbing systems while, at the same time, 
allowing latitude for innovation and new technologies. The public at large is encouraged and invited to 
participate in lAPMO's open consensus code development process. This code is updated every three years. A 
code development timeline and other relevant information is available at lAPMO's website at 
www.iapmo.org. 

The Uniform Plumbing Code is dedicated to all those who, in working to achieve "the ultimate plumbing code," 
have imselfishly devoted their time, effort, and personal fimds to create and maintain this, the finest plumbing 
code in existence today. 

The 2006 Uniform Plumbing Code is supported by the American Society of Sanitary Engineering (ASSE), the 
Mechanical Contractors Association of America (MCAA), the Plumbing-Heating-Cooling Contractors National 
Association (PHCC-NA), the United Association (UA), and the World Plumbing Council (WPC). The presence 
of these logos, while reflecting support, does not imply any ownership of the copyright to the UPC, which is 
held exclusively by lAPMO. Further, the logos of these associations indicates the support of lAPMO's open, 
consensus process being used to develop lAPMO's codes and standards. 

The addresses of the organizations are as follows: 

ASSE - 901 Canterbury Road, Suite A • Westiake, OH 44145-7201 • (440) 835-3040 
MCAA - 1385 Piccard Drive • Rockville, MD 20850 • (301) 869-5800 
PHCC-NA - PO Box 6808 • Falls Church, VA 22046 • (800) 533-7694 
UA - 901 Massachusetts Avenue NW • Washington, DC 20001 • (202) 628-5823 
WPC - WPC Secretary • c/o The Institute of Plumbing • 64 Station Lane • Hornchurch Essex 
RM12 6NB • United Kingdom • +44 17-08-47-27-91 



Tentative Interim Amendment (TIA) 

A Tentative Interim Amendment (TIA) to any Document may be processed if the Council Secretary 
determines, after a preliminary review, and consultation with the appropriate Chair, that the Amendment 
appears to be of an emergency nature requiring prompt action and has the endorsement of a Member of the 
involved Technical Committee; 



Section 206.0 Design Flood Elevation - This Tentative Interim Amendment (TIA) was issued on September 
26, 2005. 

Section 208.0 Flood Hazard Area - This Tentative Interim Amendment (TIA) was issued on September 

26. 2005. 

Section 301.3 Flood Hazard Resistance - This Tentative Interim Amendment (TIA) was issued on 
September 26, 2005. 

Section 301.3.1 General - This Tentative Interim Amendment (TIA) was issued on September 26, 2005. 

Section301.3.2 Flood hazard areas subject to high velocity wave action - This Tentative Interim 
Amendment (TIA) was issued on September 26, 2005. 

Section 41 1 .7 - This Tentative Interim Amendment (TIA) was issued on December 7, 2005. 

Section 507.8 - This Tentative Interim Amendment (TIA) was issued on December 7, 2005. 

Section 603.4.21 Pure water process systems - This Tentative Interim Amendment (TIA) was issued on 
December 7, 2005. 

Section 603.4.21 .1 Dialysis water systems - This Tentative Interim Amendment (TIA) was issued on 
December 7, 2005. 

Section 715.3 - This Tentative Interim Amendment (TIA) was issued on September 17, 2003. 

Section 1202.0 General. - This Tentative Interim Amendment (TIA) was issued on August 28, 2006. 

Section 1216.1 Required Gas Supply. - This Tentative Interim Amendment (TIA) was issued on August 

28. 2006. 

Section 1217.1 Pipe Sizing Methods. - This Tentative Interim Amendment (TIA) was issued on August 
28,2006. 

Section 1217.1.1 Longest Length IVlethod. - This Tentative Interim Amendment (TIA) was issued on 
August 28, 2006. 

Section 1217.1.2 Branch Length Method. - This Tentative Interim Amendment (TIA) was issued on August 
28, 2006. 

Section 1217.1.3 Hybrid Pressure. - This Tentative Interim Amendment (TIA) was issued on August 
28, 2006. 

Section 1217.2 Tables for Sizing Gas-Piping Systems. - This Tentative Interim Amendment (TIA) was 
issued on August 28, 2006. 

Section 1217.3 Sizing Equations. - This Tentative Interim Amendment (TIA) was issued on August 28, 2006. 

Figure 12-2 Example Illustrating Use of Tables 12-1 and 12-8 - This Tentative Interim Amendment (TIA) 
was issued on August 28, 2006. 

Section 1217.4 - This Tentative Interim Amendment (TIA) was issued on August 28, 2006. 

Section 1 21 7.5 - This Tentative Interim Amendment (TIA) was issued on August 28, 2006. 

Section 1 21 7.6 - This Tentative Interim Amendment (TIA) was issued on August 28, 2006. 

Appendix K, K 1 Private Sewage Disposal - General - This Tentative Interim Amendment (TIA) was issued 
on September 26, 2005. 

Appendix K, K 5 Septic Tank Construction - This Tentative Interim Amendment (TIA) was issued on 
September 26, 2005. 



VI 



Appendix K, Table K-1 Location of Sewage Disposal Systems - This Tentative Interim Amendment (TIA) 
was issued on September 26, 2005. 

Appendix L, L8.6 Additional Venting Required - This Tentative Interim Amendment (TIA) was issued on 
February 7, 2006. 



For further information on Tentative Interim Amendments, see Section 5 of the lAPMO Rules Governing 
Committee Projects - www.iapmo.org. 



VII 



COMMITTEE ON UNIFORM PLUMBING CODE 

These lists represent the membership at the time the Committee was balloted on the final text of this edition. Since that time, changes in the membership may have 
occurred. Please refer to the new members list below. 

Terry Swisher, Chairman 
State of Oregon, [E] 

James Weflen, Secretary 
Copper Development Association, [M] 



Robert Aagaard, American Society of Sanitary 

Engineering [R/S/T] 
Rand Ackroyd, Rand Engineering [M] 

Rep. Plumbing and Drainage Institute 
Julius Ballanco, JB Engineering/Code Consultant PC [SE] 

Rep. American Society of Plumbing Engineers 
George Bliss, United Association [L] 
Sylvanus Bloice, Roots Plumbing Ser\'ices [I/M] 
Jeremy Brown, NSF International [R/S/T] 
Lawrence Brown, National Association of Home Builders [U] 
Paul Cabot, American Gas Association [U] 
Richard Church, Plastic Pipe and Fittings Association [M] 
Donald Dickerson, Donald Dickerson Associates [SE] 
Rickey Fabra, Plumbers & Steamfitters Local [L] 
Lawrence Gibson, fntertek Testing Services [R/S/T] 



John M. Jacobs, Mechanical Contractors Association of America [I/M] 
Robert Kordulak, Plumbing-Heating-Cooling Contractors 

National Association [I/M] 
Theodore Lemoff, NFPA [R/S/T] 
William LeVan, Cast Iron Soil Pipe Institute [M] 
Thomas Pape, California Urban Water Conservation Council [C] 
Leonard Ramociotti, City of Reno [E] 
Phillips Ribbs, PHR Consultant [SE] 
Arnold Rodio, Pace Setter Plumbing [I/M] 
Anthony Scarano, Plastics Piping Consultant [SE] 
Joseph Stemola, National Propane Gas Association (NPGA) [U] 
Larry Soskin, Ace Duraflo [I/M] 
Amir Tabakh, City of Los Angeles [E] 
John Taecker, Underwriters Laboratories [R/S/T] 
Don Traylor, State Plumbing Board of Louisiana [E] 
David Viola, Plumbing Manufacturers Institute [M] 



Alternates 



Ian Chang, Intertek Testing Services [R/S/T] 
Shannon Corcoran, American Society of Sanitary 

Engineering [R/S/T] 
James Dingman, Underwriters Laboratories [R/S/T] 
Richard Emerson, Plumbing Manufacturers Institute [M] 
Bob Friedlander, Construction Code Consultant [M] 

Rep. Plastic Pipe aiid Fittings Association 
Myron Havis, Copper Development Association [M] 
Nasrin Kashefi, NSF International [R/S/T] 
Kirk Nelson, Plumbing-Heating-Cooling Contractors 



National Association [I/M] 

Michael Tharpe, City of Los Angeles [E] 

April Trafton, Donald Dickerson Associates [SE] 

Fred Volkers, United Association [L] 

James Walls, Cast Iron Soil Pipe Institute [M] 

Mike Wynne, Plumbers & Steamfitters Local [L] 



New Committee Members as of January 2006 



Tim CoUings, Salt Lake City, Utah [E] is the new chairman of the 
technical committee appointed as of March 2006 



Nasser Nikravi, State of California OSHPD [E] 

Ray Moore, American Society of Plumbing Enginner [SEl 



Nonvoting 



Chris Salazar, Ex-Officio, lAPMO [E]* 
Carl Marbery, lAPMO Staff Liaison 



Morrie Klimboff, Member Emeritus, M Klimboff Consulting [C]* 
Ljmne Simnick, lAPMO Saff Liaison 



COMMITTEE MEMBERSHIP CLASSIFICATION ABBREVIATIONS 

These classifications apply to Technical Committee members and represent their principal interest in the activity of a committee. 

M Manufacturer: A representative of a maker or marketer of a product, assembly, or system, or portion thereof, that is affected by the standard. 

U User: A representative of an entity that is subject to the provisions of tlie standard or that voluntarily uses the standard. 

I/M Inslaller/Maintainer: A representative of an entity that is in the business of ir\stalling or maintaining a product, assembly, or system affected by the standard. 

L Labor: A labor representative or employee concerned with safety in tl\e workplace. 

R/S/T Research/Standards/Testing Laboratory: A representative of an independent research organization; an organization that develops codes, standards or other similar documents; or 

an independent testing laboratory. 

E Enforcing Authority: A representative or an agency or an organization that promulgates and/or enforces standards. 

I Insurance: A representative of an insurance company, broker, agent, bureau, or inspection agency. 

C Consumer: A person who is, or represents, the ultimate purdiaser of a product, system, or ser\'ice affected by the standard, but who is not included in the User classification. 

SE Special Expert: A person not representing any of the previous classifications, but who has special expertise in the scope of the standard or portion thereof. 



VIII 



FORM FOR PROPOSALS ON lAPMO UPC/UMC COMMITTEE DOCUMENT 

NOTE: Ail proposals MUST be received by 5:00 Pl\/I PST/PDST on tlie published proposal-closing date. 



For further information on the standards-making process, please 

contact Codes and Standards Administration at 909-472-41 1 

For technical assistance, please call lAPMO at 909-472-41 1 1 or 

909-472-4104 



FOR OFFICE USE ONLY 



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Mail to: Secretary, Standards Council • lAPMO • 5001 E Philadelphia Street • Ontario • CA • 91761-2816 



IX 



INSTRUCTIONS FOR SyBMITTING PROPOSALS 
- PLEASE READ CAREFULLY - 

1 . Type or print in BLACK ink. 

2. Indicate the title of the document and the document year. Also indicate the specific 
section or paragraph that the proposed amendment applies to. 

3. Check the appropriate box to indicate whether this proposal recommends adding new 
text, revising existing text, or deleting text. 

4. In the space identified as "Proposal", indicate the exact wording you propose as new 
or revised text, or the text you propose be deleted. 

5. In the space titled "Statement of Problem and Substantiation for Proposal", state the 
problem that will be resolved by your recommendation and give the specific reason 
for your proposal. Include copies of test results, research papers, fire experience, or 
other materials that substantiate your recommendation. [See note below, item (f).] 

6. Check the appropriate box to indicate whether or not this proposal is original material, 
and, if it is not, indicate the source of the material. 

7. Sign the proposal. 

If supplementary material (photographs, diagrams, reports, etc.) is included, you may be 
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The technical committee is authorized to abstract the "Statement of Problem and 
Substantiation for Proposal" if it exceeds 200 words for publication in the Report on Proposals. 

NOTE: The lAPMO Regulations Governing Committee Projects in Paragraph 4-3.3 state: 
Each proposal shall be submitted to the Council Secretary and shall include: (a) identification 
of the submitter and his or her affiliation (i.e., technical committee, organization, company), 
where appropriate; (b) identification of the document, edition of the document, and paragraph 
of the document to which the proposal is directed; (c) the proposed text of the proposal, 
including the wording to be added, revised (and how revised), or deleted; (d) a statement of 
the problem and substantiation for proposal; (e) the signature of the submitter; and (f) two 
copies of any document(s) (other than an lAPMO document) being proposed as a reference 
standard or publication (see 3-3.7). 



TABLE OF CONTENTS 



Chapter 1 Administration 1 

101.0 Title, Scope, General . . .1 

101.1 Title • ..1 

101.2 Purpose 1 

101.3 Plans Required 1 

101.4 Scope 1 

101.5 Application to Existing 

Plumbing System ....;.. 2 

102.0 Organization and Enforcement 2 

102.1 Authority Having Jurisdiction 2 

102.2 Duties and Powers of the 

Authority Having Jurisdiction 2 

102.3 Violations and Penalties 3 

103.0 Permits and Inspections ........... . . . .3 

103.1 Permits ... .3 

103.2 Application for Permit 3 

103.3 Permit Issuance .4 

103.4 Fees 5 

103.5 Inspections 5 

103.6 Connection Approval . . .7 

103.7 Unconstitutional 7 

103.8 Validity .7 

Table 1-1 Plumbing Permit Fees 9 

Chapter 2 Definitions 11 

201.0 General 11 

202.0 Definition of Terms 11 

Chapter 3 General Regulations 21 

301 .0 Materials - Standards and Alternates . .21 

301.1 Minimum Standards 21 

301.2 Alternate Materials and Methods of 
Construction Equivalency 21 

301.3 Flood Hazard Resistance 22 

302.0 Iron Pipe Size (IPS) Pipe ......... .22 

303.0 Disposal of Liquid Waste 22 

304.0 Connections to Plumbing 

System Required .22 

305.0 Sewers Required .22 

306.0 Damage to Drainage System 

or Public Sewer 22 

307.0 Lidustrial Wastes 23 

308.0 Location 23 

309.0 Improper Location 23 

310.0 Workmanship 23 



311.0 Prohibited Fittings and Practices . . .23 

312.0 Independent Systems 23 

313.0 Protection of Piping, Materials, 

and Stiuctures 24 

314.0 Hangers and Supports 25 

315.0 Trenching, Excavation 

and Backfill 25 

316.0 Joints and Connections 25 

317.0 Increasers and Reducers 27 

318.0 Food-Handling 

Establishments 27 

319.0 TestGauges 27 

320.0 Medical Gas and Vacuum Systems . .27 

Chapter 4 Plumbing Fixtures and 

Fixture Fittings 29 

401.0 Materials -General Requirements . . .29 

402.0 Water-Conserving 

Fixtures and Fittings 29 

403.0 Overflows 29 

404.0 Strainers and Connections 29 

405.0 Prohibited Fixtures 29 

406.0 Special Fixtures and Specialties 30 

407.0 h\stallation 30 

408.0 Water Closets 30 

409.0 Urinals 30 

410.0 Flushing Devices for Water 

Closets and Urinals ..;... .31 

411.0 Floor Drains and Shower Stalls ... .31 

412.0 Minimum Number of 

Required Fixtures 33 

413.0 Fixtures and Fixture Fittings 

for Persons with Disabilities 34 

414.0 Bathtubs and Whirlpool Bathtubs ..34 

415.0 Installation of Fixture Fittings .... .34 

416.0 Bidets .34 

417.0 Future Fixtures ' ...... .34 

418.0 Shower and Tub-Shower 

Combination Contiol Valves .... . .34 

Table 4-1 Minimum Plumbing Facilities .... .35 

Chapter 5 Water Heaters Part I 39 

501.0 General 39 

502.0 Definitions 39 

503.0 Permits 40 



XI 



UNIFORM PLUMBING CODE 



504.0 Inspection 40 

505.0 Water Heater Requirements 40 

506.0 Oil-Burning and 

Other Water Heaters 40 

507.0 Air for Combustion and Ventilation . . . .40 
508.0 Other Water Heater 

Installation Requirements 40 

509.0 Equipment on Roofs 47 

510.0 Venting of Equipment 48 

511.0 Sizing of Category I Venting Systems ... 62 

512.0 Direct- Vent Equipment 66 

Part n Sizing of Venting Systems Serving 
Appliances Equipped with Draft 
Hoods, Category I Appliances, and 
Appliances Listed for Use with 
Type B Vents 86 

Chapter 6 Water Supply and Distribution . . .95 

601.0 Rurming Water Required 95 

602.0 Unlawful Connections 95 

603.0 Cross-Connection Control 96 

604.0 Materials 101 

605.0 Valves 102 

606.0 Joints and Connections 102 

607.0 Gravity Supply Tanks 103 

608.0 Water Pressure, Pressure Regulators, 

Pressure Relief Valves, and Vacuum 

Relief Valves 103 

609.0 Installation, Testing, Unions, 

and Location 104 

610.0 Size of Potable Water Piping 105 

611.0 Drinking Water Treatment Units . .107 

Table 6-5 Water Supply Fixture Units (WSFU) 

and Minimum Fixture 

Branch Pipe Sizes 108 

Table 6-6 Fixture Unit Table for Determining 

Water Pipe and Meter Sizes 109 

Chapter 7 Sanitary Drainage Ill 

Part I Drainage Systems Ill 

701.0 Materials Ill 

702.0 Fixture Unit Equivalents 113 

703.0 Size of Drainage Piping 113 

Table 7-3 Drainage Fixture Unit Values 

(DFU) 112 



Table 7-4 Discharge Capacity In Gallons per 
Minute (Liters per Second) For 

Intermittent Flow Only 113 

704.0 Fixture Connections (Drainage) . . .113 

705.0 Joints and Connections 114 

706.0 Changes in Direction of Drainage 

Flow 115 

707.0 Cleanouts 115 

708.0 Grade of Horizontal Drainage 

Piping 116 

709.0 Gravity Drainage Required 117 

710.0 Drainage of Fixtures Located Below 

the Next Upstream Manhole or Below 

the Main Sewer Level 117 

711.0 Suds Relief 118 

712.0 Testing 118 

Part II Building Sewers 119 

713.0 Sewer Required 119 

714.0 Damage to Public Sewer or Private 

Sewage Disposal System .119 

715.0 Building Sewer Materials 119 

716.0 Markings 119 

717.0 Size of Building Sewers 119 

718.0 Grade, Support, and Protection of 

Building Sewers 120 

719.0 Cleanouts 120 

720.0 Sewer and Water Pipes 120 

721.0 Location 121 

722.0 Abandoned Sewers and Sewage 

Disposal Facilities 122 

723.0 Building Sewer Test 122 

Chapter 8 Indirect Wastes 123 

801.0 Indirect Wastes 123 

802.0 Approvals . . .'. 123 

803.0 Indirect Waste Piping 124 

804.0 Indirect Waste Receptors 124 

805.0 Pressure Drainage Connections . . .124 

806.0 Sterile Equipment 124 

807.0 Appliances 124 

808.0 Cooling Water 124 

809.0 Drinking Fountains 124 

810.0 Steam and Hot Water Drainage 

Condensers and Sumps 125 

811.0 Chemical Wastes 125 

812.0 Clear Water Wastes 126 



XII 



TABLE OF CONTENTS 



813.0 Swimming Pools 126 

814.0 Condensate Wastes and Control . .126 

Chapter 9 Vents 127 

901.0 Vents Required 127 

902.0 Vents Not Required 127 

903.0 Materials 127 

904.0 Size of Vents 127 

905.0 Vent Pipe Grades and Connections . .128 

906.0 Vent Termination 128 

907.0 Vent Stacks and Relief Vents 128 

908.0 Vertical Wet Venting 129 

909.0 Special Venting for Island Fixtures . .129 

910.0 Combination Waste and 

Vent Systems 129 

Chapter 10 Traps and Interceptors 131 

1001.0 Traps Required 131 

1002.0 Traps Protected by Vent Pipes ....131 

1003.0 Traps - Described .131 

1004.0 Traps - Prohibited 132 

1005.0 Trap Seals 132 

1006.0 Floor Drain Traps 132 

1007.0 Trap Seal Protection 132 

1008.0 Building Traps 132 

1009.0 Industrial Interceptors (Clarifiers) 

and Separators 132 

1010.0 Slaughterhouses, Packing 

Establishments, etc 132 

1011.0 Minimum Requirements 

for Auto Wash Racks 132 

1012.0 Commercial and 

Industrial Laundries 133 

1013.0 Bottling Establishments 133 

1014.0 Grease Interceptors 133 

1015.0 FOG (Fats, Oils, and Greases) 

Disposal System 134 

1016.0 Sand Interceptors 135 

1017.0 Oil and Flammable 

Liquid Interceptors 136 

Chapter 11 Storm Drainage 137 

1101.0 General 137 

1102.0 Materials 137 

1103.0 Traps on Storm Drains 

and Leaders 139 

1104.0 Leaders, Conductors, 

and Connections 139 



1105.0 Roof Drains , 140 

1106.0 Size of Leaders, Conductors, and 

Storm Drains 140 

1107.0 Values of Continuous Flow 140 

1108.0 ControUed-Flow Roof Drainage . . .140 
1109.0 Testing 141 

Chapter 12 Fuel Piping 149 

1201.0 Scope of Gas Piping 149 

1202.0 General 149 

1203.0 Definitions ,149 

1204.0 h\spection 150 

1205.0 Certificate of Inspection 150 

1206.0 Authority to Render 

Gas Service 150 

1207.0 Authority to Disconnect 151 

1208.0 Temporary Use of Gas 151 

1209.0 Gas-Piping System Design, 

Materials, and Components . .151 

1210.0 Excess Flow Valve .157 

1211.0 Gas Piping Installation 158 

1212.0 Equipment Connections to Building 

Piping .165 

1213.0 Liquefied Petroleum Gas Facilities 

and Piping 166 

1214.0 Pressure Testing and Inspection . . .166 
1215.0 Interconnections Between 

Gas Piping Systems 168 

1216.0 Required Gas Supply 168 

1217.0 Required Gas Piping Size 168 

Table 12-7 to Table 12-23 171 

Chapter 13 Health Care Facilities and Medical 

Gas and Vacuum Systems 201 

Part I Special Requirements for Health 

Care Facilities 201 

1301.0 Application 201 

1302.0 Medical Gas and Vacuum Piping 

Systems -Installation Requirements . .201 

1303.0 Protrusions from Walls .201 

1304.0 Psychiatric Patient Rooms 201 

1305.0 Locations for Ice Storage 201 

1306.0 Sterilizers 201 

1307.0 Vapor Vents and Stacks 

for Sterilizers 202 

1308.0 Aspirators 202 



XIII 



UNIFORM PLUMBING CODE 



Part II Medical Gas and Vacuum System . .202 

1309.0 Application 202 

1310.0 Definitions 202 

1311.0 General Requirements 203 

1312.0 Plan Review 205 

1313.0 System Performance 205 

1314.0 Required Pipe Sizing 205 

1315.0 Workmanship 205 

1316.0 Materials 206 

1317.0 Cleaning for Medical 

Gas Piping Systems 207 

1318.0 Installation of Piping 207 

1319.0 Joints 208 

1320.0 Valves - Requirements, Locations, 

and Labeling 210 

1321.0 Pressure-Regulating Equipment ..211 

1322.0 Station Outlets /Inlets 212 

1323.0 Labeling and Identification 212 

1324.0 Alarms 213 

1325.0 Medical Air System 213 

1326.0 Medical Vacuum Pump System . . .214 

1327.0 Testing and Inspection 215 

1328.0 System Certification 218 

Chapter 14 Mandatory Referenced 

Standards 223 

Table 14-1 Standards for Materials, Equipment, 

Joints, and Connections 223 

Table 14-1 hidex 247 

Abbreviation in Table 14-1 259 

Chapter 15 Firestop Protection 261 

1501.0 General Requirements 261 

1502.0 Plans and Specifications 261 

1503.0 Installation 261 

1504.0 Definitions 261 

1505.0 Combustion Piping Installations . .261 

1506.0 Non-Combustible 

Piping Installation 261 

1507.0 Required Inspection 262 

Chapter 16 Gray Water Systems 263 

1601.0 Gray Water Systems - General 263 

1602.0 Definition , 263 

1603.0 Permit 263 

1604.0 Drawings and Specifications 263 

1605.0 Inspection and Testing 263 



1606.0 Procedure for Estimating Gray 

Water Discharge 264 

1607.0 Required Area of Subsurface 

Irrigation /Disposal Fields 264 

1608.0 Determination of Maximum 

Absorption Capacity .264 

1609.0 Holding Tank Construction 265 

1610.0 Valves and Piping 265 

1611.0 Irrigation/Disposal Field 

Construction .265 

1612.0 Special Provisions 266 

Part II 273 

1613.0 Reclaimed Water Systems - 

General 273 

1614.0 Definitions 273 

1615.0 Permit .273 

1616.0 Drawings and Specifications ..... .273 

1617.0 Pipe Material/Pipe Identification . .273 

1618.0 Installation .274 

1619.0 Signs 274 

1620.0 Inspection and Testing 275 

1621.0 Sizing 276 

1622.0 Approved Uses of Reclaimed 

Water 276 

Appendices Table of Contents 277 

Appendix A Recommended Rules for Sizing the 

Water Supply System 279 

Appendix B Explanatory Notes on Con\bination 

Waste and Vent Systems 295 

Appendix C Deleted 
Appendix D Sizing Stormwater 

Drainage Systems 297 

Appendix E Manufactured /Mobile Home Parks 

and Recreational Vehicle Parks 305 

Appendix F Firefighter Breathing Air 

Replenishment Systems 317 

Appendix I Installation Standards 

Table of Content 321 

Appendix K Private Sewage Disposal Systems . .421 
Appendix L Alternate Plumbing Systems 433 

Useful Tables 441 

Index 449 



XIV 



CHAPTER 1 



ADMINISTRATION 



101.0 Title, Scope, and General. 

101.1 Title. 

This document shall be known as the "Uniform 
Plumbing Code," may be cited as such, and will be 
referred to herein as "this code." 

101.2 Purpose. 

This code is an ordinance providing minimum 
requirements and standards for the protection of the 
public health, safety, and welfare. 

101.3 Plans Required. 

The Authority Having Jurisdiction may require the 
submission of plans, specifications, drawings, and 
such other information as the Authority Having 
Jurisdiction may deem necessary, prior to the 
commencement of, and at any time during the 
progress of, any work regulated by this code. 

The issuance of a permit upon plans and 
specifications shall not prevent the Authority Having 
Jurisdiction from thereafter requiring the correction 
of errors in said plans and specifications or from 
preventing construction operations being carried on 
thereunder when in violation of this code or of any 
other pertinent ordinance or from revoking any 
certificate of approval when issued in error. 

101 .4 Scope. 

101.4.1 The provisions of this code shall apply 
to the erection, installation, alteration, repair, 
relocation, replacement, aiddition to, use, or 
maintenance of plumbing systems within this 
jurisdiction. 

1 01 .4.1 .1 Repairs and Alterations. 

101.4.1.1.1 In existing buildings or 
premises in which plumbing installations 
are to be altered, repaired, or renovated, 
deviations from the provisions of this 
code are permitted, provided such 
deviations are found to be necessary 
and are first approved by the Authority 
Having Jurisdiction. 

101.4.1.1.2 Existing building sewers 
and building drains may be used in 
cormection with new buildings or new 
plumbing and drainage work only 
when they are found on examination 
and test to conform in all respects to the 
requirements governing new work, and 
the proper Autiiority Having Jurisdiction 
shall notify the owner to make any 



changes necessary to conform to this 
code. No building, or part thereof, shall 
be erected or placed over any part of a 
drainage system that is constructed of 
materials other than those approved 
elsewhere in this code for use under or 
within a building. 

1 01 .4.1 .1 .3 All openings into a drainage 
or vent system, excepting those openings 
to which plumbing fixtures are properly 
connected or which constitute vent 
terminals, shall be permanently plugged 
or capped in an approved manner, using 
the appropriate materials required by 
this code. 

1 01 .4.1 .2 Maintenance. The plumbing and 
drainage system of any premises under the 
Authority Having Jurisdiction shall be 
maintained in a sanitary and safe operating 
condition by the owner or the owner's 
agent. 

101.4.1.3 Existing Construction. No provi- 
sion of this code shall be deemed to 
require a change in any portion of a plumbing 
or drainage system or any other work 
regulated by this code in or on an existing 
building or lot when such work was 
installed and is maintained in accordance 
with law in effect prior to the effective date 
of this code, except when any such plumbing 
or drainage system or other work regulated 
by this code is determined by the Authority 
Having Jurisdiction to be in fact dangerous, 
unsafe, insanitary, or a nuisance and a 
menace to life, health, or property. 

101.4.1.4 Conflicts Between Codes. When 
the requirements within the jurisdiction of 
this plumbing code conflict with the require- 
ments of the mechanical code, this code shall 
prevail. 

101.4.2 Additions, alterations, repairs, and 
replacement of plumbing systems shall comply 
with the provisions for new systems except as 
otherwise provided in Section 101.5. 

101.4.3 The provisions in the appendices are 
intended to supplement the requirements of this 
code and shall not be considered part of this 
code unless formally adopted as such. 



101.5-102.2 



UNIFORM PLUMBING CODE 



101.5 Application to Existing Plumbing System. 

101.5.1 Additions, Alterations, or Repairs. 

Additions, alterations, or repairs may be made 
to any plumbing system without requiring the 
existing plumbing system to comply with all the 
requirements of this code, provided the addition, 
alteration, or repair conforms to that required for 
a new plumbing system. Additions, alterations, 
or repairs shall not cause an existing system to 
become unsafe, insanitary, or overloaded. 

101.5.2 Health and Safety. Whenever com- 
pliance with all the provisions of this code 
fails to eliminate or alleviate a nuisance, or any 
other dangerous or insanitary condition that 
may involve health or safety hazards, the owner 
or the owner's agent shall install such additional 
plumbing and drainage facilities or shall make 
such repairs or alterations as may be ordered by 
the Authority Having Jurisdiction. 

101.5.3 Existing Installation. Plumbing 
systems lawfully in existence at the time of the 
adoption of this code may have their use, 
maintenance, or repair continued if the use, 
maintenance, or repair is in accordance with the 
original design and location and no hazard to 
life, health, or property has been created by 
such plumbing system. 

101.5.4 Changes in Building Occupancy. 

Plumbing systems that are a part of any 
building or structure undergoing a change in use 
or occupancy, as defined in the Building Code, 
shall comply to all requirements of this code that 
may be applicable to the new use or occupancy. 

101.5.5 Maintenance. All plumbing systems, 
materials, and appurtenances, both existing and 
new, and all parts thereof shall be maintained in 
proper operating condition. All devices or safe- 
guards required by this code shall be maintained 
in conformance with the code edition under 
which installed. The owner or the owner's 
designated agent shall be responsible for mainte- 
nance of plumbing systems. To determine 
compliance with this subsection, the Authority 
Having Jurisdiction may cause any plumbing 
system to be reinspected. 

101.5.6 Moved Buildings. Plumbing systems 
that are part of buildings or structures moved 
into this jurisdiction shall comply with the 
provisions of this code for new installations, 
except as provided for in Section 103.5.5.2. 

102.0 Organization and Enforcement. 

102.1 Authority Having Jurisdiction. 

The Authority Having Jurisdiction shall be the 
Authority duly appointed to enforce this code. 



102.2 Duties and Powers of the Authority Having 
Jurisdiction. 

102.2.1 The Authority Having Jurisdiction may 
appoint such assistants, deputies, inspectors, or 
other employees as necessary to carry out the 
functions of the department and this code. 

102.2.2 Right of Entry. Whenever it is 
necessary to make an inspection to enforce the 
provisions of this code, or whenever the 
Authority Having Jurisdiction has reasonable 
cause to believe that there exists in any building 
or upon any premises any condition or violation 
of this code that makes the building or premises 
unsafe, insanitary, dangerous, or hazardous, the 
Authority Having Jurisdiction may enter the 
building or premises at all reasonable times to 
inspect or to perform the duties imposed upon 
the Authority Having Jurisdiction by this code, 
provided that if such building or premises is 
occupied, the Authority Having Jurisdiction 
shall present credentials to the occupant and 
request entry. If such building or premises is 
unoccupied, the Authority Having Jurisdiction 
shall first make a reasonable effort to locate the 
owner or other person having charge or control 
of the building or premises and request entry. If 
entry is refused, the Authority Having Juris- 
diction has recourse to every remedy provided 
by law to secure entry. 

When the Authority Having Jurisdiction 
shall have first obtained a proper inspection 
warrant or other remedy provided by law to 
secure entry, no owner, occupant, or person 
having charge, care, or control of any building or 
premises shall fail or neglect, after proper 
request is made as herein provided, to promptly 
permit entry herein by the Authority Having 
Jurisdiction for the purpose of inspection and 
examination pursuant to this code. 

102.2.3 Stop Orders. Whenever any work is 
being done contrary to the provisions of this 
code, the Authority Having Jurisdiction may 
order the work stopped by notice in writing 
served on any persons engaged in the doing or 
causing such work to be done, and any such 
persons shall forthwith stop work until 
authorized by the Authority Having Jurisdiction 
to proceed with the work. 

102.2.4 Authority to Disconnect Utilities in 
Emergencies. The Authority Having Jurisdiction 
shall have the authority to disconnect a plumbing 
system to a building, structure, or equipment 
regulated by this code in case of emergency 
where necessary to eliminate an immediate 
hazard to life or property. 



ADMINISTRATION 



102.2-103.2 



102.2.5 Authority to Condemn. Whenever the 
Authority Having Jurisdiction ascertains that 
any plumbing system or portion thereof, 
regulated by this code, has become hazardous 
to life, health, or property, or has become 
insanitary, the Authority Having Jurisdiction 
shall order in writing that such plumbing either 
be removed or placed in a safe or sanitary 
condition, as appropriate. The order shall fix a 
reasonable time limit for compliance. No person 
shall use or maintain defective plumbing after 
receiving such notice. 

When such plumbing system is to be 
disconnected, written notice shall be given. In 
cases of immediate danger to life or property, 
such discormection may be made immediately 
without such notice. 

102.2.6 Liability. The Authority Having 
Jurisdiction charged with the enforcement of this 
code, acting in good faith and without malice in 
the discharge of the Authority Having Jurisdiction's 
duties, shall not thereby be rendered personally 
liable for any damage that may accrue to 
persons or property as a result of any act or by 
reason of any act or omission in the discharge of 
duties. A suit brought against the Authority 
Having Jurisdiction or employee because of such 
act or omission performed in the enforcement of 
any provision of this code shall be defended by 
legal counsel provided by this jurisdiction until 
final termination of such proceedings. 

102.3 Violations and Penalties. 

102.3.1 Violations. It shall be unlawful for any 
person, firm, or corporation to erect, construct, 
enlarge, alter, repair, move, improve, remove, 
convert, demolish, equip, use, or maintain any 
plumbing or permit the same to be done in 
violation of this code. 

102.3.2 Penalties. Any person, firm, or cor- 
poration violating any provision of this code 
shall be deemed guilty of a misdemeanor, and 
upon conviction thereof, shall be punishable by 
a fine and /or imprisonment set forth by the 
governing laws of the jurisdiction. Each separate 
day or any portion thereof, during which any 
violation of this code occurs or continues, shall 
be deemed to constitute a separate offense. 

103.0 Permits and Inspections. 

103.1 Permits. 

103.1 .1 Permits Required. It shall be unlawful 
for any person, firm, or corporation to make any 
installation, alteration, repair, replacement, or 
remodel any plumbing system regulated by this 



code except as permitted in Section 103.1.2, or to 
cause the same to be done without first obtaining 
a separate plumbing permit for each separate 
building or structure. 

103.1.2 Exempt Work. A permit shall not be 
required for the following: 

103.1.2.1 The stopping of leaks in drains, 
soil, waste, or vent pipe, provided, however, 
that should any trap, drainpipe, soil, waste, 
or vent pipe become defective and it 
becomes necessary to remove and replace 
the same with new material, the same shall 
be considered as new work and a permit 
shall be procured and inspection made as 
provided in this code. 

103.1.2.2 (1) The clearing of stoppages, 
including the removal and reinstallation of 
water closets, or 

(2) the repairing of leaks ki pipes, valves, or 
fixtures, provided such repairs do not 
involve or require the replacement or 
rearrangement of valves, pipes, or fixtures. 

Exemption from the permit requirements 
of this code shall not be deemed to grant 
authorization for any work to be done in 
violation of the provisions of the code or 
any other laws or ordinances of this 
jurisdiction. 

1 03.1 .3 Licensing. Provision for licensing shall be 
determined by the Authority Having Jurisdiction. 

103.2 Application for Permit. 

103.2.1 Application. To obtain a permit, the 
applicant shall first file an application therefore 
in writing on a form furnished by the Authority 
Having Jurisdiction for that purpose. Every such 
application shall: 

103.2.1.1 Identify and describe the work to 
be covered by the permit for which 
application is made. 

103.2.1.2 Describe the land upon which the 
proposed work is to be done by legal 
description, street address, or similar 
description that will readily identify 
and definitely locate the proposed building 
or work. 

103.2.1.3 Indicate the use or occupancy for 
which the proposed work is intended. 

103.2.1.4 Be accompanied by plans, dia- 
grams, computations, and other data as 
required in Section 103.2.2. 

1 03.2.1 .5 Be signed by the permittee or the 
permittee's authorized agent, who may be 



103.2-103.3 



UNIFORM PLUMBING CODE 



required to submit evidence to indicate such 
authority. 

103.2.1 .6 Give such other data and information 
as may be required by the Authority Having 
Jurisdiction. 

103.2.2 Plans and Specifications. Plans, 
engineering calculations, diagrams, and other 
data shall be submitted in one or more sets with 
each application for a permit. The Authority 
Having Jurisdiction may require plans, 
computations, and specifications to be prepared 
by, and the plumbing designed by, an engineer 
and /or architect licensed by the state to practice 
as such. 

Exception: The Authority Having Jurisdiction 
may waive the submission of plans, calcu- 
lations, or other data if the Authority 
Having Jurisdiction finds that the nature of 
the work applied for is such that reviewing 
of plans is not necessary to obtain com- 
pliance within the code. 

103.2.3 Information on Plans and Specifications. 

Plans and specifications shall be drawn to scale 
upon substantial paper or cloth and shall be of 
sufficient clarity to indicate the location, nature, 
and extent of the work proposed and show in 
detail that it will conform to the provisions of 
this code and relevant laws, ordinances, rules, 
and regulations. 

103.3 Permit Issuance. 

103.3.1 Issuance. The application, plans, and 
specifications and other data filed by an 
applicant for a permit shall be reviewed by the 
Authority Having Jurisdiction. Such plans may 
be reviewed by other departments of this 
jurisdiction to verify compliance with applicable 
laws under their jurisdiction. If the Authority 
Having Jurisdiction finds that the work 
described in an application for permit and 
the plans, specifications, and other data filed 
therewith conform to the requirements of the 
code and other pertinent laws and ordinances, 
and that the fees specified in Section 103.4 have 
been paid, the Authority Having Jurisdiction 
shall issue a permit therefore to the applicant. 

When the Authority Having Jurisdiction 
issues the permit where plans are required, the 
Authority Having Jurisdiction shall endorse in 
writing or stamp the plans and specifications 
"APPROVED." Such approved plans and 
specifications shall not be changed, modified, or 
altered without authorization from the 
Authority Having Jurisdiction, and all work 
shall be done in accordance with approved plans. 



The Authority Having Jurisdiction may 
issue a permit for the construction of a part of a 
plumbing system before the entire plans and 
specifications for the whole system have been 
submitted or approved, provided adequate 
information and detailed statements have been 
filed complying with all pertinent requirements 
of this code. The holder of such permit may 
proceed at the holder's risk without assurance 
that the permit for the entire building, structure, 
or plumbing system will be granted. 

103.3.2 Retention of Plans. One set of 

approved plans, specifications, and computations 
shall be retained by the Authority Having 
Jurisdiction until final approval of the 
work covered therein. One set of approved plans 
and specifications shall be returned to the 
applicant, and said set shall be kept on the site of 
the building or work at all times during which 
the work authorized thereby is in progress. 

103.3.3 Validity of Permit. The issuance of a 
permit or approval of plans and specifications 
shall not be construed to be a permit for, or an 
approval of, any violation of any of the 
provisions of this code or of any other ordinance 
of the jurisdiction. No permit presuming to give 
authority to violate or cancel the provisions of 
this code shall be valid. 

The issuance of a permit based upon plans, 
specifications, or other data shaiU not prevent the 
Authority Having Jurisdiction from thereafter 
requiring the correction of errors in said plans, 
specifications, and other data or from preventing 
building operations being carried on thereunder 
when in violation of this code or of other 
ordinances of this jurisdiction. 

103.3.4 Expiration. Every permit issued by the 
Authority Having Jurisdiction under the 
provisions of this code shall expire by limitation 
and become null and void if the work authorized 
by such permit is not commenced within one 
hundred eighty (180) days from the date of such 
permit, or if the work authorized by such permit 
is suspended or abandoned at any time after the 
work is commenced for a period of one hundred 
eighty (180) days. Before such work can be 
recommenced, a new permit shall first be 
obtained to do so, and the fee therefore shall be 
one-half the amount required for a new 
permit for such work, provided no changes have 
been made or will be made in the original plans 
and specifications for such work, and provided 
further that such suspensions or abandonment 
has not exceeded one year. 



ADMINISTRATION 



103.3-103.5 



Any permittee holding an unexpired permit 
may apply for an extension of the time within 
which work may commence under that permit 
when the permittee is unable to commence work 
within the time required by this section for good 
and satisfactory reasons. The Authority Having 
Jurisdiction may extend the time for action by 
the permittee for a period not exceeding one 
hundred eighty (180) days upon written request 
by the permittee showing that circumstances 
beyond the control of the permittee have 
prevented action from being taken. No permit 
shall be extended more than once. In order to 
renew action on a permit after expiration, the 
permittee shall pay a new full permit fee. 

103.3.5 Suspension or Revocation. The 

Authority Having Jurisdiction may, in writing, 
suspend or revoke a permit issued under the 
provisions of this code whenever the permit is 
issued in error or on the basis of incorrect 
information supplied or in violation of other 
ordinance or regulation of the jurisdiction. 

103.4 Fees. 

103.4.1 Permit Fees. Fees shall be assessed in 
accordance with the provisions of this section 
and as set forth in the fee schedule Table 1-1. The 
fees are to be determined and adopted by this 
jurisdiction. 

103.4.2 Plan Review Fees. When a plan or 
other data is required to be submitted by Section 
103.2.2, a plan review fee shall be paid at the 
time of submitting plans and specifications for 
review. 

The plan review fees for plumbing work shall 
be determined and adopted by this jurisdiction. 

The plan review fees specified in this 
subsection are separate fees from the permit fees 
specified in this section and are in addition to 
the permit fees. 

When plans are incomplete or changed so as 
to require additional review, a fee shall be 
charged at the rate shown in Table 1-1. 

103.4.3 Expiration of Plan Review. Applications 
for which no permit is issued within one 
hundred eighty (180) days following the date of 
application shall expire by limitation, and plans 
and other data submitted for review may 
thereafter be returned to the applicant or 
destroyed by the Authority Having Jurisdiction. 
The Authority Having Jurisdiction may exceed 
the time for action by the applicant for a period 
not to exceed one hundred eighty (180) days 
upon request by the applicant showing that 
circumstances beyond the control of the 



applicant have prevented action from being 
taken. No application shall be extended more 
than once. In order to renew, action on an 
application after expiration, the applicant shall 
resubmit plans and pay a new plan review fee. 

103.4.4 Investigation Fees: Work Without a 
Permit. 

103.4.4.1 Whenever any work for which a 
permit is required by this code has been 
commenced without first obtaining said 
permit, a special investigation shall be made 
before a permit may be issued for such work. 

103.4.4.2 An investigation fee, in addition 
to the permit fee, shall be collected whether 
or not a permit is then or subsequently 
issued. The investigation fee shall be equal 
to the amount of the permit fee that would 
be required by this code if a permit were to 
be issued. The payment of such investigation 
fee shall not exempt any person from 
compliance with all other provisions of this 
code, nor from any penalty prescribed by law. 

103.4.5 Fee Refunds. 

103.4.5.1 The Authority Having Jurisdiction 
may authorize the refunding of any fee paid 
hereunder that was erroneously paid or 
collected. 

1 03.4.5.2 The Authority Having Jurisdiction 
may authorize the refunding of not more 
than a percentage, as determined by this 
jurisdiction when no work has been done 
under a permit issued in accordance with 
this code. 

1 03.4.5.3 The Authority Having Jurisdiction 
shall not authorize the refunding of any fee 
paid except upon written application filed 
by the original permittee not later than one 
hundred eighty (180) days after the date of 
fee payment. 

103.5 Inspections. 

103.5.1 General. All plumbing systems for 
which a permit is required by this code shall be 
inspected by the Authority Having Jurisdiction. 
No portion of any plumbing system shall be 
concealed until inspected and approved. Neither 
the Authority Having Jurisdiction nor the 
jurisdiction shall be liable for expense entailed in 
the removal or replacement of material required 
to permit inspection. When the installation of a 
plumbing system is complete, an additional and 
final inspection shall be made. Plumbing 
systems regulated by this code shall not be 
connected to the water, the energy fuel supply. 



103.5 



UNIFORM PLUMBING CODE 



or the sewer system uritil authorized by the 
Authority Having Jurisdiction. 

103.5.1.1 Inspection. No water supply 
system or portion thereof shall be covered or 
concealed until it first has been tested, 
inspected, and approved. 

103.5.1.2 Scope. All new plumbing work 
and such portions of existing systems as 
may be affected by new work, or any 
changes, shall be inspected by the Authority 
Having Jurisdiction to ensure compliance 
with all the requirements of this code and 
to ensure that the installation and construc- 
tion of the plumbing system is in accordance 
with approved plans. 

103.5.1.3 Covering or Using. No plumbing 
or drainage system, building sewer, private 
sewer disposal system, or part thereof, shall be 
covered, concealed, or put into use until it has 
been tested, inspected, and accepted as 
prescribed in this code. 

103.5.1.4 Uncovering. If any drainage or 
plumbing system, building sewer, private 
sewage disposal system, or part thereof, 
which is installed, altered, or repaired, is 
covered or concealed before being inspected, 
tested, and approved as prescribed in this 
code, it shall be uncovered for inspection 
after notice to uncover the work has been 
issued to the responsible person by the 
Authority Having Jurisdiction. 

103.5.2 Operation of Plumbing Equipment. 

The requirements of this section shall not be 
considered to prohibit the operation of any 
plumbing installed to replace existing equipmient 
or fixtures serving an occupied portion of the 
building in the event a request for inspection of 
such equipment or fixture has been filed with 
the Authority Having Jurisdiction not more than 
seventy-two (72) hours after such replacement 
work is completed, and before any portion of 
such plumbing system is concealed by any 
permanent portion of the building. 

103.5.3 Testing of Systems. All plumbing 
systems shall be tested and approved as 
required by this code or the Authority Having 
Jurisdiction. 

103.5.3.1 Test. Tests shall be conducted in 
the presence of the Authority Having 
Jurisdiction or the Authority Having 
Jurisdiction's duly appointed representative. 

103.5.3.2 Test Waived. No test or inspection 
shall be required where a plumbing system, 



or part thereof, is set up for exhibition 
purposes and has no connection with a 
water or drainage system. 

103.5.3.3 Exceptions. In cases where it 
would be impractical to provide the required 
water or air tests, or for minor installations 
and repairs, the Authority Having Jurisdiction 
may make such inspection as deemed 
advisable in order to be assured that the 
work has been performed in accordance 
with the intent of this code. 

103.5.3.4 Protectively Coated Pipe. 

Protectively coated pipe shall be inspected 
and tested, and any visible void, damage, or 
imperfection to the pipe coating shall be 
repaired to comply with Section 313.0 (see 
lAPMO IS-13, Hsted in Appendix I). 

103.5.3.5 Tightness. Joints and connections 
in the plumbing system shall be gastight 
and watertight for the pressures required by 
test. 

103.5.4 Inspection Requests. It shall be the 
duty of the person doing the work authorized by 
a permit to notify the Authority . Having 
Jurisdiction that such work is ready for 
inspection. The Authority Having Jurisdiction 
may require that every request for inspection be 
filed at least one working day before such 
inspection is desired. Such request may be in 
writing or by telephone, at the option of the 
Authority Having Jurisdiction. 

It shall be the duty of the person requesting 
inspections required by this code to provide 
access to and means for proper inspection of 
such work. 

103.5.4.1 Advance Notice. It shall be 
the duty of the person doing the work 
authorized by the permit to notify the 
Authority Having Jurisdiction, orally or 
in writing, that said work is ready for 
inspection. Such notification shall be 
given not less than twenty-four (24) 
hours before the work is to be inspected. 

103.5.4.2 Responsibility. It shall be the 
duty of the holder of a permit to make sure 
that the work will stand the test prescribed 
before giving the notification. 

The equipment, material, and labor 
necessary for inspection or tests shall be 
furnished by the person to whom the 
permit is issued or by whom inspection 
is requested. 

103.5.5 Other Inspections. In addition to 
the inspections required by this code, the 



ADMINISTRATION 



103.5 -103.8 



Authority Having Jurisdiction may require 
other inspections of any plumbing work to 
ascertain compliance with the provisions of 
this code and other laws that are enforced 
by the Authority Having Jurisdiction. 

103.5.5.1 Defective Systems. An air test 
shall be used in testing the sanitary condition 
of the drainage or plumbing system of any 
building premises when there is reason to 
believe that it has become defective. In 
buildings or premises condemned by the 
proper Authority Having Jurisdiction 
because of an insanitary condition of the 
plumbing system or part thereof, the 
alterations in such system shall conform to 
the requirements of this code. 

103.5.5.2 Moved Structures. All parts 
of the plumbing systems of any building or 
part thereof that is moved from one founda- 
tion to another, or from one location to another, 
shall be completely tested as prescribed 
elsewhere in this section for new work, except 
that walls or floors need not be removed 
during such test when other equivalent 
means of inspection acceptable to the 
Authority Having Jurisdiction are provided. 

103.5.6 ReJnspections. A reinspection fee 
may be assessed for each inspection or reins- 
pection when such portion of work for which 
inspection is called is not complete or when 
required corrections have not been made. 

This provision is not to be interpreted as 
requiring reinspection fees the first time a 
job is rejected for failure to comply with the 
requirements of this code, but as controlling 
the practice of calling for inspections before 
the job is ready for inspection or reinspection. 

Reinspection fees may be assessed when the 
approved plans are not readily available 
to the inspector, for failure to provide access on 
the date for which the inspection is requested, or 
for deviating from plans requiring the approval 
of the Authority Having Jurisdiction. 

To obtain reinspection, the applicant shall 
file an application therefore in writing upon a 
form furnished for that purpose and pay the 
reinspection fee in accordance with Table 1-1. 

In instances where reinspection fees have 
been assessed, no additional inspection of the 
work will be performed until the required fees 
have been paid. 

103.5.6.1 Corrections. Notices of correction 
or violation shall be written by the Authority 



Having Jurisdiction and may be posted at the 
site of the work or mailed or delivered to the 
permittee or his authorized representative. 

Refusal, failure, or neglect to comply 
with any such notice or order within ten 
(10) days of receipt thereof, shall be 
considered a violation of this code and 
shall be subject to the penalties set forth 
elsewhere in this code for violations. 

103.5.6.2 Retesting. If the Authority 
Having Jurisdiction finds that the work 
will not pass the test, necessary corrections 
shall be made, and the work shall then be 
resubmitted for test or inspection. 

103.5.6.3 Approval. Upon the satisfactory 
completion and final test of the plumbing 
system, a certificate of approval shall be 
issued by the Authority Having Jurisdiction 
to the permittee on demand. 

103.6 Connection Approval. 

103.6.1 Energy Connections. No person shall 
make connections from a source of energy or 
fuel to any plumbing system or equipment 
regulated by this code and for which a permit is 
required until approved by the Authority 
Having Jurisdiction. 

103.6.2 Other Connections. No person shall 
make connection from any water-supply line nor 
shall cormect to any sewer system regulated by 
this code and for which a permit is required until 
approved by the Authority Having Jurisdiction. 

103.6.3 Temporary Connections. The Authority 
Having Jurisdiction may authorize temporary 
connection of the plumbing equipment to the 
source of energy or fuel for the purpose of 
testing the equipment. 

103.7 Unconstitutional. 

103.7.1 If any section, subsection, sentence, 
clause, or phrase of this code is, for any reason, 
held to be unconstitutional, siich decision shall 
not affect the validity of the remaining portions 
. of this code. The Legislative body hereby 
declares that it would have passed this code, and 
each section, subsection, sentence, clause, or 
phrase thereof, irrespective of the fact that 
one or more sections, subsections, sentences, 
clauses, and phrases are declared 
unconstitutional. 

103.8 Validity 

103.8.1 If any provision of this code, or the 
application thereof to any person or circimistance, 
is held invalid, the remainder of the code, or the 
application of such provision to other persons or 
circumstances, shall not be affected thereby. 



103.8 UNIFORM PLUMBING CODE 

1 03.8.2 Wherever in this code reference is made 
to an appendix, the provisions in the appendix 
shall not apply unless specifically adopted. 



ADMINISTRATION Table 1-1 

TABLE 1-1 

Plumbing Permit Fees 
Permit Issuance 

1. For issuing each permit * 

2. For issuing each supplemental permit * 

Unit Fee Schedule (in addition to items 1 and 2 above) 

1 . For each plumbing fixture on one trap or a set of fixtures on one trap (including water, 

drainage piping, and backflow protection therefore) ....* 

2. For each building sewer and each trailer park sewer *_ 

3. Rainwater systems - per drain (inside building) * 

4. For each cesspool (where permitted) * 

5. For each private sewage disposal system * 

6. For each water heater and/or vent * 

7. For each gas piping system of one to five outlets * 

8. For each additional gas piping system outlet, per outlet * 

9. For each industrial waste pretreatment interceptor, including its trap and vent, 

except kitchen-type grease interceptors functioning as fixture traps * 

10. For each installation, alteration, or repair of water piping and/or water treating equipment, each ..* 

11. For each repair or alteration of drainage or vent piping, each fixture * 

12. For each lawn sprinkler system on any one meter including backflow protection devices therefore ...* 

13. For atmospheric-type vacuum breakers not included in item 12: 

1 to 5 * 

overs, each * 

14. For each backflow protective device other than atmospheric-type vacuum breakers: 

2 inch (51 mm) diameter and smaller * 

over 2 inch (51 mm) diameter * 

15. For each graywater system * 

16. For initial installation and testing for a reclaimed water system * 

17. For each annual cross-connection testing of a reclaimed water system (excluding initial test) * 

18. For each medical gas piping system serving one to five inlet(s)/outlet(s) for a specific gas * 

19. For each additional medical gas inlet(s)/outlet(s) * 



Other Inspections and Fees 

1 . Inspections outside of normal business hours 

2. Reinspection fee 

3. Inspections for which no fee is specifically indicated 

4. Additional plan review required by changes, additions, or 
revisions to approved plans (minimum charge - one-half hour). 

* Jurisdiction will indicate their fees here. 



UNIFORM PLUMBING CODE 



10 



CHAPTER 2 

DEFINITIONS 



201.0 General. 

For the purpose of this code, the following terms 
have the meanings indicated in this chapter. 

No attempt is made to define ordinary words, 
which are used in accordance with their established 
dictionary meanings, except where a word has been 
used loosely and it is necessary to define its meaning 
as used in this code to avoid misunderstanding. 

The definitions of terms are arranged alphabe- 
tically according to the first word of the term. 

202.0 Definition of Terms. 



203.0 



-A- 



ABS - Acrylonitrile-butadiene-styrene. 

Accessible - When applied to a fixture, connection, 
appliance, or equipment, "accessible" means having 
access thereto, but which first may require the 
removal of an access panel, door, or similar 
obstruction. "Readily accessible" means direct access 
without the necessity of removing any panel, door, 
or similar obstruction. 

Airbreak - A physical separation which may be a 
low inlet into the indirect waste receptor from the 
fixture, appliance, or device indirectly connected. 

Air Chamber - A pressure surge-absorbing device 
operating through the compressibility of air. 

Airgap, Drainage - The unobstructed vertical 
distance through the free atmosphere between the 
lowest opening from any pipe, plumbing fixture, 
appliance, or appurtenance conveying waste to the 
flood-level rim of the receptor. 

Airgap, Water Distribution - The unobstructed 
vertical distance through the free atmosphere 
between the lowest opening from any pipe or faucet 
conveying potable water to the flood-level rim of any 
tartk, vat, or fixture. 

Anchors - See Supports. 

Approved - Acceptable to the Authority Having 

Jurisdiction. 

Approved Testing Agency - An organization 
primarily established for purposes of testing to 
approved standards and approved by the Authority 
Having Jurisdiction. 

Area Drain - A receptor designed to collect surface 
or storm water from an open area. 



Aspirator - A fitting or device supplied with water 
or other fluid under positive pressure that passes 
through an integral orifice or constriction, causing a 
vacuum. 

Authority Having Jurisdiction - The organization, 
office, or individual responsible for enforcing the 
requirements of a code or standard, or for approving 
equipment, materials, installations, or procedures. 
The Authority Having Jurisdiction shall be a federal, 
state, local, or other regional department or an 
individual such as a plumbing official, mechanical 
official, labor department official, health department 
official, building official, or others having statutory 
authority. In the absence of a statutory authority, the 
Authority Having Jurisdiction may be some other 
responsible party. This definition shall include the 
Authority Having Jurisdiction's duly authorized 
representative. 

204.0 - B - 

Backflow - The flow of water or other liquids, 
mixtures, or substances into the distributing pipes of 
a potable supply of water from any sources other 
than its intended source. See Back-Siphonage, Back- 
Pressure Backflow. 

Backflow Connection - Any arrangement whereby 
backflow can occur. 

Back-Pressure Backflow - Backflow due to an 
increased pressure above the supply pressure, which 
may be due to pumps, boilers, gravity, or other 
sources of pressure. 

Backflow Preventer - A device or means to prevent 
backflow into the potable water system. 

Back-Siphonage - The flowing back of used, 
contaminated, or polluted water from a plumbing 
fixture or vessel into a water supply pipe due to a 
pressure less than atmospheric in such pipe. See 
Backflow. 

Backwater Valve - A device installed in a drainage 
system to prevent reverse flow. 

Bathroom - A room equipped with a shower or 
bathtub. 

Battery of Fixtures - Any group of two (2) or more 
similar, adjacent fixtures that discharge into a 
common horizontal waste or soil branch. 

Boiler Blowoff - An outlet on a boiler to permit 
emptying or discharge of sediment. 

Branch - Any part of the piping system other than a 
main, riser, or stack. 



11 



204.0 - 205.0 



UNIFORM PLUMBING CODE 



Branch, Fixture - See Fixture Branch. 

Branch, Horizontal - See Horizontal Branch. 

Branch Vent - A vent connecting one or more 
individual vents with a vent stack or stack vent. 

Building - A structure built, erected, and framed of 
component structural parts designed for the housing, 
shelter, enclosure, or support of persons, animals, or 
property of any kind. 

Building Drain - That part of the lowest piping of a 
drainage system that receives the discharge from 
soil, waste, and other drainage pipes inside the walls 
of the building and conveys it to the building sewer 
begiiming two (2) feet (610 mm) outside the building 
wall. 

Building Drain (Sanitary) - A building drain that 

conveys sewage only. 

Building Drain (Storm) - A building drain that 

conveys storm water or other drainage, but no 

sewage. 

Building Sewer - That part of the horizontal piping 
of a drainage system that extends from the end of the 
building drain and that receives the discharge of the 
building drain and conveys it to a public sewer, 
private sewer, private sewage disposal system, or 
other point of disposal. 

Building Sewer (Combined) - A building sewer 
that conveys both sewage and storm water or other 
drainage. 

Building Sewer (Sanitary) - A building sewer that 
conveys sewage only. 

Building Sewer (Storm) - A building sewer that 
conveys storm water or other drainage, but no 
sewage. 

Building Subdrain - That portion of a drainage 
system that does not drain by gravity into the 
building sewer. 

Building Supply - The pipe carrying potable water 
from the water meter or other source of water supply 
to a building or other point of use or distribution on 
the lot. Building supply shall also mean water service. 



205.0 



-C- 



Certified Baclcflow Assembly Tester - A person 
who has shown competence to test and maintain 
backflow assemblies to the satisfaction of the 
Authority Having Jurisdiction. 

Cesspool - A lined excavation in the ground that 
receives the discharge of a drainage system or part 
thereof, so designed as to retain the organic matter 
and solids discharging therein, but permitting the 
liquids to seep through the bottom and sides. 

Chemical Waste - See Special Wastes. 



Clarif ier - See Interceptor. 

Clear Water Waste - Cooling water and condensate 
drainage from refrigeration and air-conditioning 
equipment; cooled condensate from steam heating 
systems; cooled boiler blowdown water. 

Clinic Sinl< - A sink designed primarily to receive 
wastes from bedpans and having a flush rim, an 
integral trap with a visible trap seal, and the same 
flushing and cleansing characteristics as a water 
closet. 

Code - A standard that is an extensive compilation 
of provisions covering broad subject matter or that is 
suitable for adoption into law independently of other 
codes and standards. 

Combination Thermostatic/Pressure Balancing 
Valve - A mixing valve that senses outlet tempera- 
ture and incoming hot and cold water pressure and 
compensates for fluctuations in incoming hot and 
cold water temperatures and/or pressures to 
stabilize outlet temperatures. 

Combination Waste and Vent System - A specially 
designed system of waste piping embodying the 
horizontal wet venting of one or more sinks or floor 
drains by nieans of a comnion waste and vent pipe, 
adequately sized to provide free movement of air 
above the flow line of the drain. 

Combined Building Sewer - See Building Sewer 
(Combined). 

Common - That part of a plumbing system that is so 
designed and installed as to serve more than one (1) 
appliance, fixture, building, or system. 

Conductor - A pipe inside the building that conveys 
storm water from the roof to a storm drain, 
combined building sewer, or other approved point of 
disposal. 

Confined Space - A room or space having a volume 
less than fifty (50) cubic feet per 1,000 Btu/h (1.4 
mV293 W) of the aggregate input rating of all fuel- 
burning appliances installed in that space. 

Contamination - An impairment of the quality of 
the potable water that creates an actual hazard to the 
public health through poisoning or through the 
spread of disease by sewage, industrial fluids, or 
waste. Also defined as High Hazard. 

Continuous Vent - A vertical vent that is a 
continuation of the drain to which it connects. 

Continuous Waste - A drain connecting the 
compartments of a set of fixtures to a trap or 
connecting other permitted fixtures to a common trap. 

CPVC - Chlorinated Poly (Vinyl Chloride). 

Critical Level - The critical level (C-L or C/L) 
marking on a backflow prevention device or vacuum 
breaker is a point conforming to approved standards 



12 



DEFINITIONS 



205.0 - 208.0 



TIA 
TIA 
TIA 

FIA 
lA 



and established by the testing laboratory (usually 
stamped on the device by the manufacturer) that 
determines the minimum elevation above the flood- 
level rim of the fixture or receptor served at which 
the device may be installed. When a backflow 
prevention device does not bear a critical level 
marking, the bottom of the vacuum breaker, 
combination valve, or the bottom of any such 
approved device shall constitute the critical level. 

Cross-Connection - Any connection or 
arrangement, physical or otherwise, between a 
potable water supply system and any plumbing 
fixture or any tank, receptor, equipment, or device, 
through which it may be possible for non potable, 
used, unclean, polluted, and contaminated water, or 
other substances to enter into any part of such 
potable water system under any condition. 



207.0 



-E- 



206.0 



-D 



Department Having Jurisdiction - The Authority 
Having Jurisdiction, including any other law 
enforcement agency affected by any provision of 
this code, whether such agency is specifically named 
or not. 

Design Flood Elevation - The elevation of the 
"design flood," including wave height, relative to the 
datum specified on the community's legally 
designated flood hazard map. 

Developed Length - The length along the center 
line of a pipe and fittings. 

Diameter - Unless specifically stated, "diameter" is 
the nominal diameter as designated commercially. 

Domestic Sewage - The liquid and water-borne 
wastes derived from the ordinary living processes, 
free from industrial wastes, and of such character as 
to permit satisfactory disposal, without special 
treatment, into the public sewer or by means of a 
private sewage disposal system. 

Downspout - The rain leader from the roof to the 
building storm drain, combined building sewer, or 
other means of disposal located outside of the 
building. See Conductor and Leader. 

Drain - Any pipe that carries waste or waterborne 
wastes in a building drainage system. 

Drainage System - Includes all the piping within 
public or private premises that conveys sewage or 
other liquid wastes to a legal point of disposal, but 
does not include the mains of a public sewer system 
or a public sewage treatment or disposal plant. 

Durham System - A soil or waste system in which 
all piping is threaded pipe, tubing, or other such 
rigid construction, using recessed drainage fittings to 
correspond to the types of piping. 



Effective Opening - The minimum cross-sectional 
area at the point of water supply discharge measured 
or expressed in terms of (1) diameter of a circle or. (2) 
if the opening is not circular, the diameter of a circle 
of equivalent cross-sectional area. (This is applicable 
also to airgap.) 

Essentially Nontoxic Transfer Fluid - Essentially 
nontoxic at practically nontoxic. Toxicity Rating Class 
1 (reference "Clinical Toxicology of Commercial 
Products" by Gosselin, Smith, Hodge, & Braddock). 

Excess Flow Valve - A valve designed to close 
when the fuel gas passing through exceeds a 
prescribed flow rate. 

Existing Work - A plumbing system or any part 
thereof that has been installed prior to the effective 
date of this code. 



208.0 



>F- 



Fixture Branch - A water supply pipe between the 
fixture supply pipe and the water distributing pipe. 

Fixture Drain - The drain from the ti-ap of a fixture to 
the junction of that drain with any other drain pipe. 

Fixture Supply - A water supply pipe connecting 
the fixture with the fixture branch. 

Fixture Unit - A quantity in terms of which the load- 
producing effects on the plumbing system of 
different kinds of plumbing fixtures are expressed on 
some arbitrarily chosen scale. 

Flammable Vapor or Fumes is the concentration of 
flammable constituents in air that exceeds 25 percent 
of its lower flammability limit (LFL). 

Flood Hazard Area - The greater of the following 
two areas: 

1. The area within a floodplain subject to a 1 
percent or greater chance of flooding in any 
given year. 

2. The area designated as a flood hazard area 
on a community's flood hazard map, or 
otherwise legally designated. 

Flood Hazard Area Subject to High Velocity Wave 
Action - Area within the flood hazard area that is 
subject to high velocity wave action, and shown on a 
Flood Insurance Rate Map or other flood hazard map 
as Zone V, VO, VE or Vl-30. 

Flood Level - See Flooded. 

Flood-Level Rim - The top edge of a receptor from 
which water overflows. 

Flooded - A fixture is flooded when the liquid 
therein rises to the flood-level rim. 



TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 



13 



208.0-211.0 



UNIFORM PLUMBING CODE 



Flush Tank - A tank located above or integral with 
water closets, urinals, or similar fixtures for the 
purpose of flushing the usable portion of the fixture. 

Flush Valve - A valve located at the bottom of a 
tank for the purpose of flushing water closets and 
similar fixtures. 

Flushometer Tank - A tank integrated within an air 
accumulator vessel that is designed to discharge a 
predetermined quantity of water to fixtures for 
flushing purposes. 

Flushometer Valve - A valve that discharges a 
predetermined quantity of water to fixtures for 
flushing purposes and is actuated by direct water 
pressure. 

FOG Disposal System - A grease interceptor that 
reduces nonpetroleum fats, oils, and grease (FOG) in 
effluent by separation, and mass and volume 
reduction. 

209.0 - G - 

Gang or Group Shower - Two or more showers in a 
common area. 

Grade - The slope or fall of a line of pipe in reference 
to a horizontal plane. In drainage, it is usually 
expressed as the fall in a fraction of an inch (mm) or 
percentage slope per foot (meter) length of pipe. 

Gravity Grease Interceptor - A plumbing 
appurtenance or appUance that is installed in a sanitary 
drainage system to intercept nonpetroleum fats, oils, 
and greases (FOG) from a wastewater discharge and is 
identified by volume, 30-minute retention time, 
baffle(s), a minimum of two compartments, a 
minimum total volume of 300 gallons, and gravity 
separation. [These interceptors comply with the 
requirements of Chapter 10 or are designed by a 
registered professional engineer.] Gravity grease 
interceptors are generally installed outside. 

Grease Interceptor - A plumbing appurtenance or 
appliance that is installed in a sanitary drainage 
system to intercept nonpertroleuni fats, oil, and 
greases (FOG) from a wastewater discharge. 

Grease Removal Device (GRD) - Any hydro- 
mechanical grease interceptor that automatically, 
mechanically removes non-petroleum fats, oils and 
grease (FOG) from the interceptor, the control of 
which are either automatic or manually initiated. 

Grease Trap - A device designed to retain grease from 
one (1) to a maximum of four (4) fixtures. This term has 
been used in previous editions of this code. Refer to 
Hydromechanical Grease Interceptor and Gravity 
Grease Interceptor, GRD, and FOG disposal system. 



210.0 



-H 



Hangers - See Supports. 

High Hazard - See Contamination. 

Horizontal Branch - A drain pipe extending 
laterally from a soil or waste stack or building drain 
with or without vertical sections or branches, which 
receives the discharge from one or more fixture 
drains and conducts it to the soil or waste stack or to 
the building drain. 

Horizontal Pipe - Any pipe or fitting that is installed 
in a horizontal position or which makes an angle of 
less than forty-five (45) degrees with the horizontal. 

Hot Water - Water at a temperature greater than or I 
equal to 120T (49°C). I 

House Drain - See Building Drain. 

House Sewer - See Building Sewer. 

Hydromechanical Grease Interceptor - A 

plumbing appurtenance or appliance that is installed 
in a sanitary drainage system to intercept 
nonpetroleum fats, oil, and grease (FOG) from a 
wastewater discharge and is identified by flow rate, 
and separation and retention efficiency. The design 
incorporates air entrainment, hydromechanical 
separation, interior baffling, and /or barriers in 
combination or separately, and one of the following: 

A - External flow control, with air intake (vent): 
directly connected 

B - External flow control, without air intake 
(vent): directly connected 

C - Without external flow control, directly 
connected 

D - Without external flow control, indirectly 
connected 

[These interceptors comply with the requirements of 
Table 10-2.] Hydromechanical grease interceptors 
are generally installed inside. 



211.0 



-I- 



Indirect Waste Pipe - A pipe that does not connect 
directly with the drainage system but conveys liquid 
wastes by discharging into a plumbing fixture, 
interceptor, or receptacle that is directly connected to 
the drainage system. 

Individual Vent - A pipe installed to vent a fixture 
trap and that connects with the vent system above 
the fixture served or terminates in the open air. 

industrial Waste - Any and all liquid or water- 
borne waste from industrial or commercial 
processes, except domestic sewage. 

Insanitary - A condition that is contrary to sanitary 
principles or is injurious to health. 



14 



DEFINITIONS 



211.0-215.0 



Conditions to which "insanitary" shall apply 
include the following: 

(1) Any trap that does not maintain a proper 
trap seal. 

(2) Any opening in a drainage system, except 
where lawful, that is not provided with an 
approved water-sealed trap. 

(3) Any plumbing fixture or other waste- 
discharging receptor or device that is not 
supplied with water sufficient to flush and 
maintain the fixture or receptor in a clean 
condition. 

(4) Any defective fixture, trap, pipe, or fittiag. 

(5) Any trap, except where in this code 
exempted, directly cormected to a drainage 
system, the seal of which is not protected 
against siphonage and back-pressure by a 
vent pipe. 

(6) Any connection, cross-connection, construction, 
or condition, temporary or permanent, that 
would permit or make possible by any means 
whatsoever for any imapproved foreign 
matter to enter a water distribution system 
used for domestic purposes. 

(7) The foregoing enumeration of conditions to 
which the term "insanitary" shall apply 
shall not preclude the application of that 
term to conditions that are, in fact, insanitary. 

Interceptor (Clarifier) - A device designed and 
installed so as to separate and retain deleterious, 
hazardous, or undesirable matter from normal 
wastes and permit normal sewage or liquid wastes to 
discharge into the disposal terminal by gravity. 

Invert -The lowest portion of the inside of a 
horizontal pipe. 

212.0 -J- 

Joint, Brazed - Any joint obtained by joining of 
metal parts with alloys that melt at temperatures 
higher than 840°F (449°C), but lower than the 
melting temperature of the parts to be joined. 

Joint, Soldered - A joint obtained by the joining of 
metal parts with metallic mixtures or alloys that melt at 
a temperature up to and including 840°F (449°C). 



214.0 



-L- 



213.0 

No definitions 



K- 



Labeled - Equipment or materials bearing a label of 
a listing agency (accredited conformity assessment 
body). See Listed (third-party certified). 

Lavatories in Sets - Two (2) or three (3) lavatories 
that are served by one (1) trap. 

Leader - An exterior vertical drainage pipe for 
conveying storm water from roof or gutter drains. 
See Downspout. 

Liquid Waste - The discharge from any fixture, 
appliance, or appurtenance in cormection with a 
plumbing system that does not receive fecal matter. 

Listed (Third-party certified) - Equipment or 
materials included in a list published by a listing 
agency (accredited conformity assessment body) that 
maintains periodic inspection on current production 
of listed equipment or materials and whose listing 
states either that the equipment or material complies 
with approved standards or has been tested and 
found suitable for use in a specified manner. 

Listing Agency - An agency accredited by an 
independent and authoritative conformity 
assessment body to operate a material and product 
listing and labeling (certification) system and that is 
accepted by the Authority Having Jurisdiction, 
which is in the business of listing or labeling. The 
system includes initial and ongoing product testing, 
a periodic inspection on current production of listed 
(certified) products, and makes available a published 
report of such listing in which specific information is 
included that the material or product conforms to 
applicable standards and found safe for use in a 
specific manner. 

Lot - A single or individual parcel or area of land 
legally recorded or validated by other means 
acceptable to the Authority Having Jurisdiction on 
which is situated a building or which is the site of 
any work regulated by this code, together with the 
yards, courts, and unoccupied spaces legally 
required for the building or works, and that is 
owned by or is in the lawful possession of the owner 
of the building or works. 

Low Hazard - See Pollution. 

215.0 -M- 

Macerating Toilet System - A system comprised of 
a sump with macerating pump and with connections 
for a water closet and other plumbing fixtures, which 
is designed to accept, grind, and pump wastes to an 
approved point of discharge. 

IWain - The principal artery of any system of continuous 
piping to which branches maybe coraiected. 



15 



215.0-218.0 



UNIFORM PLUMBING CODE 



Main Sewer - See Public Sewer. 

Main Vent - The principal artery of the venting 
system to which vent branches may be connected. 

May - A permissive term. 

Mobile Home Park Sewer - That part of the 
horizontal piping of a drainage system that begins 
two (2) feet (610 mm) downstream from the last 
mobile home site and conveys it to a public sewer, 
private sewer, private sewage disposal system, or 
other point of disposal. 

216.0 -N- 

Nuisance - Includes, but is not limited to: 

(1) Any public nuisance known at cormnon law 
or in equity jurisprudence. 

(2) Whenever any work regulated by this code 
is dangerous to human life or is detrimental to 
health and property. 

(3) Inadequate or unsafe water supply or 
sewage disposal system. 

217.0 -O- 

Offset - A conibination of elbows or bends in a line 
of piping that brings one section of the pipe out of 
line but into a line parallel with the other section. 

Oil Interceptor - See Interceptor. 



218.0 



-P- 



PB - Polybutylene. 

PE - Polyethylene. 

PE-AL-PE - Polyethylene-aluminum-polyethylene. 

PEX - Cross-linked polyethylene. 

PEX-AL-PEX - Cross-linked polyethylene — 
aluininum-cross-linked polyethylene. 

Person - A natural person, his heirs, executor, 
administrators, or assigns and shall also include a 
firm, corporation, municipal or quasi-municipal 
corporation, or governmental agency. Singular 
includes plural, male includes fen\ale. 

Pipe - A cylindrical conduit or conductor 
conforming to the particular dimensions commonly 
known as "pipe size." 

Plumbing - The business, trade, or work having to 
do with the installation, removal, alteration, or repair 
of plumbing systems or parts thereof. 

Plumbing Appliance - Any one of a special class of 
devices or equipment that is intended to perform a 
special plumbing function. Its operation and /or 



control may be dependent upon one or more 
energized components, such as motors, controls, 
heating elements, or pressure- or temperature- 
sensing elements. Such device or equipment may 
operate automatically through one or more of the 
following actions: a time cycle, a temperature range, 
a pressure range, a measured volume or weight; or 
the device or equipment may be manually adjusted 
or controlled by the user or operator. 

Plumbing Appurtenance - A manufactured device, 
a prefabricated assembly, or an on-the-job assembly 
of component parts that is an adjunct to the basic 
piping system and plumbing fixtures. An 
appurtenance demands no additional water supply, 
nor does it add any discharge load to a fixture or the 
drainage system. It performs some useful function in 
the operation, maintenance, servicing, economy, or 
safety of the plumbing system. 

Plumbing Fixture - An approved-type installed 
receptacle, device, or appliance that is supplied with 
water or that receives liquid or liquid-borne wastes 
and discharges such wastes into the drainage system 
to which it may be directly or indirectly connected. 
Industrial or commercial tanks, vats, and similar 
processing equipment are not plumbing fixtures, but 
may be connected to or discharged into approved 
traps or plumbing fixtures when and as otherwise 
provided for elsewhere in this code. 

Plumbing Official - See Authority Having 
Jurisdiction. 

Plumbing System - Includes all potable water, 
building supply, and distribution pipes; all 
plumbing fixtures and traps; all drainage and vent 
pipes; and all building drains and building sewers, 
including their respective joints and connections, 
devices, receptors, and appurtenances within the 
property lines of the premises and shall include 
potable water piping, potable water treating or using 
equipment, medical gas and medical vacuum 
systems, liquid and fuel gas piping, and water 
heaters and vents for same. 

Pollution - An impairment of the quality of the 
potable water to a degree that does not create a 
hazard to the public health but which does adversely 
and unreasonably affect the aesthetic qualities of 
such potable water for domestic use. Also defined as 
Low Hazard. 

Potable Water - Water that is satisfactory for 
drinking, culinary, and domestic purposes and that 
meets the requirements of the Health Authority 
Having Jurisdiction. 

PP - Polypropylene. 



16 



DEFINITIONS 



218.0-221.0 



Pressure - The normal force exerted by a 
homoger\eous liquid or gas, per unit of area, on the 
wall of the container. 

(1) Static Pressure - The pressure existing 
without any flow. 

(2) Residual Pressure - The pressure available 
at the fixture or water outlet after allowance is 
made for pressure drop due to friction loss, 
head, meter, and other losses in the system 
during maximum demand periods. 

Pressure-Balancing Valve - A mixing valve that 
senses incoming hot and cold water pressures and 
compensates for fluctuations in either to stabilize 
outlet temperature. 

Private or Private Use - Applies to plumbing 
fixtures in residences and apartments, to private 
bathrooms in hotels and hospitals, and to restrooms 
in commercial establishments where the fixtures are 
intended for the use of a family or an individual. 

Private Sewage Disposal System - A septic tank 
with the effluent discharging into a subsurface 
disposal field, into one or more seepage pits, or into 
a combination of subsurface disposal field and 
seepage pit or of such other facilities as may be 
permitted under the procedures set forth elsewhere 
in this code. 

Private Sewer - A building sewer that receives the 
discharge from more than one (1) building drain and 
conveys it to a public sewer, private sewage disposal 
system, or other point of disposal. 

Public or Public Use - All buildings or structures 
that are not defined as private or private use. 

Public Sewer - A common sewer directly controlled 
by public authority. 

PVC - Poly(vinyl chloride). 

I PVDF - Polyvinylidene Fluoride. 

219.0 -Q- 

No definitions. 

220.0 - R - 

Receptor - An approved plumbing fixture or device 
of such material, shape, and capacity as to 
adequately receive the discharge from indirect waste 
pipes, so constructed and located as to be readily 
cleaned. 

Regulating Equipment - Includes all valves and 
controls used in a plumbing system that are required 
to be accessible or readily accessible. 

Relief Vent - A vent, the primary function of which 
is to provide circulation of air between drainage and 
vent systems or to act as an auxiliary vent on a 
specially designed system. 



Remote Outlet - When used for sizing water piping, 
it is the furthest outlet dimension, measuring from 
the meter, either the developed length of the cold- 
water piping or through the water heater to the 
furthest outlet on the hot-water piping. 

Rim - See Flood-Level Rim. 

Riser - A water supply pipe that extends vertically 
one (1) full story or more to convey water to 
branches or fixtures. 

Roof Drain - A drain installed to receive water 
collecting on the surface of a roof and to discharge it 
into a leader, downspout, or conductor. 

Roughing-ln - The installation of all parts of the 
plumbing system that can be completed prior to the 
installation of fixtures. This includes drainage, water 
supply, gas piping, vent piping, and the necessary 
fixture supports. 



221.0 



-S- 



Sand Interceptor - See Interceptor. 

SDR - An abbreviation for "standard dimensional 
ratio," which is the specific ratio of the average 
specified outside diameter to the minimum wall 
thickness for outside controlled diameter plastic pipe. 

Seepage Pit - A lined excavation in the ground 
which receives the discharge of a septic tank so 
designed as to permit the effluent from the septic 
tank to seep through its bottom and sides. 

Septic Tank - A watertight receptacle that receives 
the discharge of a drainage system or part thereof, 
designed and constructed so as to retain solids, 
digest organic matter through a period of detention, 
and allow the liquids to discharge into the soil 
outside of the tank through a system of open joint 
piping or a seepage pit meeting the requirements of 
this code. 

Sewage - Any liquid waste containing animal or 
vegetable matter in suspension or solution and that 
may include liquids containing chen\icals in solution. 

Sewage Ejector - A device for lifting sewage by 
entraining it on a high-velocity jet stream, air, or 
water. 

Sewage Pump - A permanently installed 
mechanical device, other than an ejector, for 
removing sewage or liquid waste from a sump. 

Shall - Indicates a mandatory requirement. 

Shielded Coupling - An approved elastomeric 
sealing gasket with an approved outer shield and a 
tightening mechanism. 

Shock Arrester - See Water Hammer Arrester. 



17 



221 .0 - 224.0 



UNIFORM PLUMBING CODE 



Should - Indicates a recommendation or that which 
is advised but not required. 

Single-Family Dwelling - A building designed to be 
used as a home by the owner of such building, which 
shall be the only dwelling located on a parcel of 
ground with the usual accessory buildings. 

Size and Type of Tubing - See Diameter. 

Slip Joint - An adjustable tubing connection, 
consisting of a compression nut, a friction ring, and a 
compression washer, designed to fit a threaded 
adapter fitting or a standard taper pipe thread. . 

Slope - See Grade. 

Soil Pipe - Any pipe that conveys the discharge of 
water closets, urinals, clinic sinks, or fixtures 
having similar functions of collection and removal 
of domestic sewage, with or without the discharge 
from other fixtures, to the building drain or 
building sewer. 

Special Wastes - Wastes that require some special 
method of handling, such as the use of indirect waste 
piping and receptors, corrosion-resistant piping, 
sand, oil or grease interceptors, condensers, or other 
pretreatment facilities. 

Stack - The vertical main of a system of soil, 
waste, or vent piping extending through one or 
more stories. 

Stack Vent - The extension of a soil or waste stack 
above the highest horizontal drain connected to 
the stack. 

Standard - A document, the main text of which 
contains only mandatory provisions using the 
word "shall" to indicate requirements and which is 
in a form generally suitable for mandatory 
reference by another standard or code or for 
adoption into law. Nonmandatory provisions shall 
be located in an appendix, footnote, or fine print 
note and are not to be considered a part of the 
requirements of a standard. 

Storm Drain - See Building Drain (Storm). 

Storm Sewer - A sewer used for conveying 
rainwater, surface water, condensate, cooling water, 
or similar liquid wastes. 

Subsoil Drain - A drain that collects subsurface or 
seepage water and conveys it to a place of disposal. 

Sump - An approved tank or pit that receives 
sewage or liquid waste and which is located below 
the normal grade of the gravity system and which 
must be emptied by mechanical means. 

Supports - Supports, hangers, and anchors are 
devices for properly supporting and securing pipe, 
fixtures, and equipment. 



222.0 - T - 

Tailpiece - The pipe or tubing that connects the 
outlet of a plumbing fixture to a trap. 

Thermostatic (Temperature Control) Valve - A 

mixing valve that senses outlet temperature and 
compensates for fluctuations in incoming hot or cold 
water temperatures. 

Trap - A fitting or device so designed and 
constructed as to provide, when properly vented, a 
liquid seal that will prevent the back passage of air 
without materially affecting the flow of sewage or 
wastewater through it. 

Trap Arm - That portion of a fixture drain between a 
trap and the vent. 

Trap Primer - A device and system of piping that 
maintains a water seal in a remote trap. 

Trap Seal - The vertical distance between the crown 
weir and the top dip of the trap. 

Crown Weir (Trap Weir) -The lowest point in 
the cross-section of the horizontal waterway at 
the exit of the trap. 

Top Dip (of trap) - The highest point in the 
internal cross-section of the trap at the lowest 
part of the bend (inverted siphon). By contrast, 
the bottom dip is the lowest point in the internal 
cross-section. 

223.0 - U - 

Unconfined Space - A room or space having a 
volume equal to at least 50 cubic feet per 1,000 Btu/h 
(1.4 m^/293 W) of the aggregate input rating of all 
fuel-burning appliances installed in that space. 
Rooms communicating directly with the space in 
which the appliances are installed, through openings 
not furnished with doors, are considered a part of 
the unconfined space. 

Unsanitary - See Insanitary. 

224.0 - V - 

Vacuum - Any pressure less than that exerted by the 
atmosphere. 

Vacuum Breaker - See Backflow Preventer. 

Vacuum Relief Valve - A device that prevents 
excessive vacuum in a pressure vessel. 

Vent - Any pipe provided to ventilate a plumbing 
system, to prevent trap siphonage and back- 
pressure, or to equalize the air pressure within the 
drainage system. 

Vent Pipe - See Vent. 



18 



DEFINITIONS 



224.0 - 228.0 



Vent Stack - The vertical vent pipe installed 
primarily for the purpose of providing circulation of 
air to and from any part of the drainage system. 

Vent System - A pipe or pipes installed to provide a 
flow of air to or from a drainage system or to 
provide a circulation of air within such system to 
protect trap seals from siphonage and back-pressure. 

Vented Flow Control Device - A device installed 
upstream, from the hydromechanical grease 
interceptor having an orifice that controls the rate of 
flow through the interceptor, and an air intake (vent) 
downstream from the orifice, which allows air to be 
drawn into the flow stream. 

Vertical Pipe - Any pipe or fitting that is installed in 
a vertical position or that makes an angle of not more 
than forty-five (45) degrees with the vertical. 

225.0 - W - 

Wall-Hung Water Closet - A water closet installed 
in such a way that no part of the water closet touches 
the floor. 

Waste - See Liquid Waste and Industrial Waste. 

Waste Pipe - A pipe that conveys only liquid waste, 
free of fecal matter. 

Water-Conditioning or Treating Device - A device 
that conditions or treats a water supply so as to 
change its chemical content or remove suspended 
solids by filtration. 

Water-Distributing Pipe - In a building or premises, 
a pipe that conveys potable water from the building 
supply pipe to the plumbing fixtures and other 
water outlets. 

Water Hammer Arrester - A device to absorb 
hydraulic shock, either of the air chamber or 
mechanical device design. 

Water Main (Street Main) - A water supply pipe for 
public or community use. 

Water Supply System - The building supply pipe, 
the water-distributing pipes, and the necessary 
connecting pipes, fittings, control valves, backflow 
prevention devices, and all appurtenances carrying 
or supplying potable water in or adjacent to the 
building or premises. 

Welded Joint or Seam - Any joint or seam obtained 
by the joining of metal parts in the plastic molten 
state. 

Welder, Pipe - A person who specializes in the 
welding of pipes and holds a valid certificate of 
competency from a recognized testing laboratory, 
based on the requirements of the ASME Boiler and 
Pressure Vessels code. Section IX. 

Wet Vent - A vent that also serves as a drain. 



Whirlpool Bathtub - A bathtub fixture equipped 
and fitted with a circulating piping system designed 
to accept, circulate, and discharge bathtub water 
upon each use. 



226.0 

No definitions. 

227.0 



-X- 



-Y- 



Yoke Vent - A pipe connecting upward from a soil 
or waste stack to a vent stack for the purpose of 
preventing pressure changes in the stacks. 



228.0 

No definitions. 



-Z- 



19 



UNIFORM PLUMBING CODE 



20 



CHAPTER 3 

GENERAL REGULATIONS 



301 .0 Materials - Standards and Alternates. 

301.1 Minimum Standards. 

301.1.1 Approvals. All pipe, pipe fittings, 
traps, fixtures, material, and devices used in a 
plumbing system shall be listed or labeled 
(third-party certified) by a listing agency 
(accredited conformity assessment body) and 
shall conform to approved applicable recognized 
standards referenced in this code, and shall be 
free from defects. Unless otherwise provided for 
in this code, all materials, fixtures, or devices 
used or entering into the construction of 
plumbing systems, or parts thereof, shall be 
submitted to the Authority Having Jurisdiction 
for approval. 

301.1.2 Marking. Each length of pipe and each 
pipe fitting, trap, fixture, material, and device 
used in a plumbing system shall have cast, 
stamped, or indelibly marked on it the 
manufacturer's mark or name, which shall readily 
identify the manufacturer to the end user of the 
product when such marking is required by the 
approved standard that applies. When required 
by the approved standard that applies, the 
product shall be marked with the weight and the 
quality of the product. All materials and devices 
used or entering into the coristruction of plumbing 
and drainage systems, or parts thereof, shall be 
marked and identified in a manner satisfactory to 
the Authority Having Jurisdiction. All such 
marking shall be done by the manufacturer. Field 
marking shall not be acceptable. 

301.1.3 Standards. Standards listed or referred 
to in this chapter or other chapters cover 
materials that will conform to the requirements 
of this code, w^hen used in accordance with the 
limitations imposed in this or other chapters 
thereof and their listing. Where a standard 
covers materials of various grades, weights, 
quality, or configurations, there may be only a 
portion of the listed standard that is applicable. 
Design and materials for special conditions or 
materials not provided for herein may be used 
only by special permission of the Authority 
Having Jurisdiction after the Authority Having 
Jurisdiction has been satisfied as to their 
adequacy. A list of accepted plumbing materials 
standards is included in Table 14-1. All lAPMO 
Installation Standards are included in Appendix 
I for the convenience of the users of this code. 



They are not considered as a part of this code 
unless formally adopted as such by the 
Authority Having Jurisdiction. 

301.1.4 Existing Buildings. In existing buildings 
or premises in which plumbing installations are 
to be altered, repaired, or renovated, the 
Authority Having Jurisdiction has discretionary 
powers to permit deviation from the provisions 
of this code, provided that such a proposal to 
deviate is first submitted for proper determi- 
nation in order that health and safety require- 
ments, as they pertain to plumbing, shall be 
observed. 

301.2 Alternate Materials and Methods of 
Construction Equivalency. Nothing in this code is 
intended to prevent the use of systems, methods, or 
devices of equivalent or superior quality, strength, 
fire resistance, effectiveness, durability, and safety 
over those prescribed by this code. Technical 
documentation shall be submitted to the Authority 
Having Jurisdiction to demonstrate equivalency. The 
Authority Having Jurisdiction shall approve the 
system method or device when determined to be 
equivalent or superior. 

However, the exercise of this discretionary 
approval by the Authority Having Jurisdiction shall 
have no effect beyond the jurisdictional boundaries 
of said Authority Having Jurisdiction. Any alternate 
material or method of construction so approved shall 
not be considered as conforming to the requirements 
and /or intent of this code for any purpose other than 
that granted by the Authority Having Jurisdiction 
when the submitted data does not prove equivalency. 

301 .2.1 Testing. The Authority Having Jurisdic- 
tion shall have the authority to require tests, as 
proof of equivalency. 

301.2.1.1 Tests shaU be made in accordance 
with approved standards, by an approved 
testing agency at the expense of the applicant. 
In the absence of such standards, the 
Authority Having Jurisdiction shall have the 
authority specify the test procedure. 

301 .2.1 .2 The Authority Having Jurisdiction 
shall have the authority to require tests to be 
made or repeated if, at any time, there is 
reason to believe that any material or device 
no longer conforms to the requirements on 
which its approval was based. 



21 



301.3-306.1 



UNIFORM PLUMBING CODE 



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301 .3 Flood Hazard Resistance. 

301.3.1 General. Plumbing systems shall be 
located above the design flood elevation. 

Exception: Plumbing systems are permitted 
to be located below the design flood 
elevation provided that the systems are 
designed and installed to prevent water from 
entering or accumulating within their 
components and the systems are constructed 
to resist hydrostatic and hydrodynamic 
loads and stresses, including the effects of 
buoyancy, during the occurrence of flooding 
to the design flood elevation. 

301 .3.2 Flood Hazard Areas Subject to High- 
Velocity Wave Action. Plumbing systems in 
buildings located in flood hazard areas subject to 
high-velocity wave action shall meet the 
requirements of Section 301.3.1, and the 
plumbing systems, pipes, and fixtures shall not 
be mounted on or penetrate through walls that 
are intended to breakaway under flood loads as 
required by the building code. 

301 .4 Alternative Engineered Design. 

301.4.1 Design Criteria. An alternative 
engineered design shall conform to the intent of 
the provisions of this code and shall provide an 
equivalent level of quality, strength, effective- 
ness, fire resistance, durability, and safety. 
Material, equipment, or components shall be 
designed and installed in accordance with the 
manufacturer's installation instructions. 

301.4.2 Permit Application. The registered 
professional engineer shall indicate on the design 
documents that the plumbing system, or parts 
thereof, is an alternative engineered design so 
that it is noted on the construction permit 
application. The permit and permanent permit 
records shall indicate that an alternative 
engineered desigri was part of the approved 
installation. 

301.4.3 Technical Data. The registered 
professional engineer shall submit sufficient 
technical data to substantiate the proposed 
alternative engineered design and to prove that 
the performance meets the intent of this code. 

301.4.4 Design Documents. The registered 
professional engineer shall provide two (2) 
complete sets of signed and sealed design 
documents for the alternative engineered design 
for submittal to the Authority Having Jurisdic- 
tion. The design documents shall include floor 
plans and a riser diagram of the work. Where 
appropriate, the design documents shall indicate 
the direction of flow, all pipe sizes, grade of 



horizontal piping, loading, and location of 
fixtures and appliances. 

301.4.5 Design Approval. Where the Authority 
Having Jurisdiction determines that the 
alternative engineered design conforms to the 
intent of this code, the plumbing system shall be 
approved. If the alternative engineered design is 
not approved, the Authority Having Jurisdiction 
shall notify the registered professional engineer 
in writing, stating the reasons therefore. 

301 .4.6 Inspection and Testing. The alternative 
engineered design shall be tested and inspected 
in accordance with the submitted testing and 
inspection plan and the requirements of this code. 

302.0 Iron Pipe Size (IPS) Pipe. 

Iron, steel, brass, and copper pipe shall be standard- 
weight iron pipe size (IPS) pipe. 

303.0 Disposal of Liquid Waste. 

It shall be unlawful for any person to cause, suffer, or 
permit the disposal of sewage, human excrement, or 
other liquid wastes, in any place or manner, except 
through and by means of an approved drainage 
system, installed and maintained in accordance with 
the provisions of this code. 

304.0 Connections to Plumbing System Required. 

All plumbing fixtures, drains, appurtenances, and 
appliances, used to receive or discharge liquid wastes 
or sewage, shall be connected properly to the drainage 
system of the building or premises, in accordance 
with the requirements of this code. 

305.0 Sewers Required. 

305.1 Every building in which plumbing fixtures are 
installed shall have a connection to a public or private 
sewer except as provided in Section 305.2. 

305.2 When a public sewer is not available for use, 
drainage piping from buildings and premises shall 
be connected to an approved private sewage 
disposal system. 

305.3 In cities and /or counties where the installation 
of building sewers is under the jurisdiction of a 
department other than the Authority Having Jurisdic- 
tion, the provisions of this code relating to building 
sewers need not apply. 

306.0 Damage to Drainage System or Public Sewer. 

306.1 It shall be unlawful for any person to deposit, 
by any means whatsoever, into any plumbing fixture, 
floor drain, interceptor, sump, receptor, or device. 



22 



GENERAL REGULATIONS 



306.1 -312.0 



which is connected to any drainage system, public 
sewer, private sewer, septic tank, or cesspool, any 
ashes; cinders; solids; rags; inflammable, poisonous, 
or explosive liquids or gases; oils; grease; or any 
other thing whatsoever that would, or could, cause 
damage to the drainage system or public sewer. 

306.2 Roofs, inner courts, vent shafts, light wells, or 
similar areas having rainwater drain, shall discharge 
to the outside of the building or to the gutter and 
shall not be connected to the sanitary drainage 
system unless first approved by the Authority 
Having Jurisdiction. 

307.0 Industrial Wastes. 

307.1 Wastes detrimental to the public sewer system 
or detrimental to the functioning of the sewage 
treatment plant shall be treated and disposed of as 
found necessary and directed by the Authority 
Having Jurisdiction. 

307.2 Sewage or other waste from a plumbing 
system that may be deleterious to surface or 
subsurface waters shall not be discharged into the 
ground or into any waterway unless it has first been 
rendered safe by some acceptable form of treatment 
as required by the Authority Having Jurisdiction. 

308.0 Location. 

308.1 Except as otherwise provided in this code, no 
plumbing system, drainage system, building sewer, 
private sewage disposal system, or parts thereof 
shall be located in any lot other than the lot that is 
the site of the building, structure, or premises served 
by such facilities. 

308.2 No subdivision, sale, or transfer of ownership 
of existing property shall be made in such manner 
that the area, clearance, and access requirements of 
this code are decreased. 

309.0 Improper Location. 

Piping, fixtures, or equipment shall not be so located 
as to interfere with the normal use thereof or with 
the normal operation and use of windows, doors, or 
other required facilities. 

310.0 Workmanship. 

310.1 All design, construction, and workmanship 
shall be in conformity with accepted engineering 
practices and shall be of such character as to secure 
the results sought to be obtained by this code. 

31 0.2 It is unlawful to conceal cracks, holes, or other 
imperfections in materials by welding, brazing, or 
soldering or by using therein or thereon any paint, 
wax, tar, or other leak-sealing or repair agent. 



310.3 Burred ends of all pipe and tubing shall be 
reamed to the full bore of the pipe or tube, and all 
chips shall be removed. 

310.4 Installation Practices. Plumbing systems 
shall be installed in a manner conforming to this 
code, applicable standards, and the manufacturer's 
installation instructions. In instances where the code, 
applicable standards, or the manufacturer's 
instructions conflict, the more stringent provisions 
shall prevail. 

31 1 .0 Prohibited Fittings and Practices. 

311.1 No double hub fitting, single or double tee 
branch, single or double tapped tee branch, side inlet 
quarter bend, running thread, band, or saddle shall 
be used as a drainage fitting, except that a double 
hub sanitary tapped tee may be used on a vertical 
line as a fixture connection. 

311.2 No drainage or vent piping shall be drilled 
and tapped for the purpose of making connections 
thereto, and no cast-iron soil pipe shall be threaded. 

31 1 .3 No waste connection shall be made to a closet 
bend or stub of a water closet or similar fixture. 

31 1 .4 Except as hereinafter provided in Sections 908.0, 
909.0, and 910.0, no vent pipe shaU be used as a soil or 
waste pipe, nor shall any soil or waste pipe be used as 
a vent. Also, single-stack drainage and venting 
systems with unvented branch lines are prohibited. 

31 1 .5 No fitting, fixture and piping connection, 
appliance, device, or method of installation that 
obstructs or retards the flow of water, wastes, 
sewage, or air in the drainage or venting systems, in 
an amount greater than the normal frictional 
resistance to flow, shall be used unless it is indicated 
as acceptable in this code or is approved per Section 
301.1 of this code. The enlargement of a three (3) inch 
(80 mm) closet bend or stub to four (4) inches (100 I 
mm) shall not be considered an obstruction. | 

311.6 Except for necessary valves, where inter- 
membering or mixing of dissimilar metals occurs, 
the point of connection shall be confined to exposed 
or accessible locations. 

31 1 .7 All valves, pipes, and fittings shall be installed 
in correct relationship to the direction of flow. 

311.8 Screwed Fittings. Screwed fittings shall be 
ABS, cast iron, copper, copper alloy, malleable iron, 
PVC, steel, or other approved materials. Threads 
shall be tapped out of solid metal or molded in soUd 
ABS or PVC. 



312.0 Independent Systems. 

The drainage system of each new building and of new 
work installed in any existing building shall be 
separate and independent from that of any other 



23 



312.0-313.12 



UNIFORM PLUMBING CODE 



building, and, when available, every building shall 
have an independent connection with a public or 
private sewer. 

Exception: Where one building stands in the 
rear of another building on an interior lot, and 
no private sewer is available or can be 
constructed to the rear building through an 
adjoining court, yard, or driveway, the building 
drain from the front building may be extended 
to the rear building. 

313.0 Protection of Piping, Materials, and Structures. 

313.1 All piping passing under or through walls 
shall be protected from breakage. All piping passing 
through or under cinders or other corrosive 
materials shall be protected from external corrosion 
in an approved manner. Approved provisions shall 
be made for expansion of hot water piping. Voids 
around piping passing through concrete floors on 
the ground shall be appropriately sealed. 

313.2 All piping in connection with a plumbing 
system shall be so installed that piping or 
connections will not be subject to undue strains or 
stresses, and provisions shall be made for expansion, 
contraction, and structural settlement. No plumbing 
piping shall be directly embedded in concrete or 
masonry. No structural member shall be seriously 
weakened or impaired by cutting, notching, or 
otherwise, as defined in the Building Code. 

313.3 All trenches deeper than the footing of any 
building or structure and paralleling the same shall be 
at least forty-five (45) degrees (0.79 rad) therefrom, or 

I as approved per Section 301.1 of this code. 

31 3.4 No building sewer or other drainage piping or 
part thereof, constructed of materials other than 
those approved for use imder or within a building, 
shall be installed under or w^ithin two (2) feet (610 
mni) of any building or structure, or less than one (1) 
foot (305 mm) below the surface of the ground. 

313.5 Piping subject to corrosion, erosion, or 
mechanical damage shall be protected in an 
approved manner. 

313.6 No water, soil, or waste pipe shall be installed 
or permitted outside of a building or in an exterior 
wall unless, where necessary, adequate provision is 
made to protect such pipe from freezing. 

313.7 All piping penetrations of fire-resistance-rated 
walls, partitions, floors, floor /ceiling assemblies, 
roof/ceiling assemblies, or shaft enclosures shall be 
protected in accordance with the requirements of the 
Building Code, lAPMO Installation Standards, and 
Chapter 15, "Firestop Protection." 



313.8 Waterproofing of Openings. Joints at the roof 
around pipes, ducts, or other appurtenances shall be 
made watertight by the use of lead, copper, 
galvanized iron, or other approved flashings or 
flashing material. Exterior wall openings shall be 
made watertight. Counterflashing shall not restrict 
the required internal cross-sectional area of the vent. 

313.9 Plastic and copper piping penetrating a | 
framing members to within one (1) inch (25.4 mm) of 
the exposed framing shall be protected by steel nail 
plates not less than 0.0478 inches (18 gauge) (1.3mm) 
in thickness. The steel nail plate shall extend along 
the framing member a minimurri of 1-1/2 inches 
beyond the outside diameter of the pipe or tubing. 

Exception: See Section 1211.3.4. 

313.10 Sleeves. 

313.10.1 Sleeves shall be provided to protect all 
piping through concrete and masonry walls and 
concrete floors. 

Exception: Sleeves shall not be required where 
openings are drilled or bored. 

313.10.2 Piping through concrete or masonry 
walls shall not be subject to any load from 
building construction. 

313.10.3 In exterior waUs, annular space between 
sleeves and pipes shall be sealed and made 
watertight, as approved by the Authority Having 
Jurisdiction. Any penetration through fire- 
resistive construction shall be in accordance with 
Section 313.7. 

313.10.4 Any pipe sleeve through a firewall shall 
have the space around the pipe completely 
sealed with an approved fire-resistive material 
in accordance with all other codes. 

31 3.11 Any structural member weakened or 
unpaired by cutting, notching, or otherwise shall be 
reinforced, repaired, or replaced so as to be left in a 
safe structural condition in accordance with the 
requirements of the Building Code. 

313.12 Ratproofing. 

31 3.1 2.1 Strainer plates on drain inlets shall be 
designed and installed so that no opening is 
greater than one-half (1/2) inch (12.7 mm) in the 
least dimension. 

313.12.2 Meter boxes shall be constructed in 
such a manner that rats cannot enter a building 
by following the service pipes from the box into 
the building. 

313.12.3 In or on buildings where openings 
have been made in walls, floors, or ceilings for 
the passage of pipes, such openings shall be 
closed and protected by the installation of 
approved metal collars securely fastened to the 
adjoining structure. 



24 



GENERAL REGULATIONS 



313.12-316.1 



313.12.4 Tub waste openings in framed 
construction to crawl spaces at or below the first 
floor shall be protected by the installation of 
approved metal collars or metal screen securely 
fastened to the adjoining structure with no 
opening greater than one-half (1/2) inch 
(12.7mm) in the least dimension. 

314.0 Hangers and Supports. 

314.1 Suspended piping shall be supported at 
intervals not to exceed those shown in Table 3-2. 

314.2 All piping shall be supported in such a 
manner as to maintain its alignment and prevent 
sagging. 

314.3 Piping in the ground shall be laid on a firm 
bed for its entire length; where other support is 
otherwise provided, it shall be approved per Section 
301.0 of this code. 

314.4 Hangers and anchors shall be of sufficient 
strength to support the weight of the pipe and its 
contents. Piping shall be isolated from incompatible 
materials. 

314.5 All piping, fixtures, appliances, and 
appurtenances shall be adequately supported in 
accordance with this code, the manufacturer's 
installation instructions, and as required by the 
Authority Having Jurisdiction. 

314.6 Hanger rod sizes shall be no smaller than 
those shown in Table 3-1. 

314.7 All gas piping shall be supported by metal 
straps or hooks at intervals not to exceed those 
shown in Table 3-2. 



TABLE 3-1 
Hanger Rod Sizes 



Pipe and Tube Size 


Rod Size 


inches 


mm 


Inches 


mm 


1/2-4 


12.7-102 


3/8 


9.5 


5-8 


127-203 


1/2 


12.7 


10-12 


254-305 


5/8 


15.9 



315.0 Trenching, Excavation, and Backfill. 

315.1 All trenches deeper than the footing of any 
building or structure and paralleling the same shall 
be at least forty-five (45) degrees (0.79 rad) therefrom, 

I or as approved per Section 301.0 of this code. 

31 5.2 Turmeling and driving may be done in yards, 
courts, or driveways of any building site. Where 



sufficient depth is available to permit, tunnels may 
be used between open-cut trenches. Tunnels shall 
have a clear height of two (2) feet (610 mm) above 
the pipe and shall be limited in length to one-half 
(1/2) the depth of the trench, with a maximum 
length of eight (8) feet (2438 mm). When pipes are 
driven, the drive pipe shall be at least one (1) size 
larger than the pipe to be laid. 

315.3 Open Trenches. All excavations required to 
be made for the installation of a building drainage 
system or any part thereof, within the walls of a 
building, shall be open trench work and shall be 
kept open until the piping has been inspected, 
tested, and accepted. 

31 5.4 All excavations shall be completely backfilled 
as soon after inspection as practicable. Adequate 
precaution shall be taken to ensure proper 
compactness of backfill around piping without 
damage to such piping. Trenches shall be backfilled 
in thin layers to twelve (12) inches (305 mm) above 
the top of the piping with clean earth, which shall 
not contain stones, boulders, cinderfill, frozen earth, 
construction debris, or other materials that would 
damage or break the piping or cause corrosive 
action. Mechanical devices such as bulldozers, 
graders, etc., may then be used to complete backfill 
to grade. Fill shall be properly compacted. Suitable 
precautions shall be taken to ensure permanent 
stability for pipe laid in filled or made ground. 

316.0 Joints and Connections. 

316.1 Types of Joints. 

316.1.1 Threaded Joints. Threads on iron pipe 
size (IPS) pipe and fittings shall be standard 
taper pipe threads in accordance with standards 
listed in Table 14-1. Threads on tubing shall be 
approved types. Threads on plastic pipe shall be 
factory cut or molded. Threaded plastic pipe 
shall be Schedule 80 minimum wall thickness. 
Tubing threads shall conform to fine tubing 
thread standards. When a pipe joint material is 
used, it shall be applied only on male threads, 
and such materials shall be approved types, 
insoluble in water and nontoxic. Cleanout plugs 
and caps shall be lubricated with water- 
insoluble, nonhardening material or tape. 
Thread tape or thread lubricants and sealants 
specifically intended for use with plastics shall 
be used on plastic threads. Conventional pipe 
thread compounds, putty, linseed-oil-based 
products, and unknown lubricants and sealants 
shall not be used on plastic threads. 

316.1.2 Wiped Joints. Joints in lead pipe or 
fittings or between lead pipe or fittings and brass 
or copper pipe, ferrules, solder rupples, or traps 



25 



316.1 -316.3 



UNIFORM PLUMBING CODE 



shall be full-wiped joints. Wiped joints shall 
have an exposed surface on each side of a joint 
not less than three-fourths (3/4) inch (19.1 mm.) 
and at least as thick as the material being joined. 
Wall or floor flange lead-wiped joints shall be 
made by using a lead ring or flange placed 
behind the joint at the wall or floor. Joints 
between lead pipe and cast iron, steel, or 
wrought iron shall be made by means of a 
caulking ferrule or soldering nipple. 

316.1.3 Soldered Joints. Joints in copper 
tubing shall be made by the appropriate use of 
approved copper or copper alloy fittings. 
Surfaces to be joined by soldering shall be 
cleaned bright by manual or mechanical means. 
The joints shall be properly fluxed with an 
approved-type flux and made up with approved 
solder. All solder and fluxes shall be 
manufactured to approved standards. Solders 
and fluxes with a lead content that exceeds two- 
tenths (0.20) of one (1) percent shall be 
prohibited in piping systems used to convey 
potable water. 

316.1.4 Flared Joints. Flared joints for soft 
copper tubing shall be made with fittings 
meeting approved standards. The tubing shall 
be reamed to the full inside diameter, resized to 
round, and expanded with a proper flaring tool. 

316.1.5 Flexible Compression Factory- 
Fabricated Joints. When pipe is joined by 
means of flexible compression joints, such 
joints shall conform to approved standards 
and shall not be considered as slip joints. 

316.1.6 Solvent Cement Plastic Pipe Joints. 

Plastic pipe and fittings designed to be joined by 
solvent cementing shall comply with appropriate 
lAPMO Installation Standards. 

ABS pipe and fittings shall be cleaned and 
then joined with solvent cement(s). 

CPVC pipe and fittings shall be cleaned and 
then joined with listed primer(s) and solvent 
cement(s). 

Exception: Listed solvent cements that do not 
require the use of primer shall be permitted 
for use with CPVC pipe and fittings, 
manufactured in accordance with ASTM 
D2846, 1/2 inch through 2 inches in diameter. 

PVC pipe and fittings shall be cleaned and 
joined with primer(s) and solvent cement(s). 

A solvent cement transition joint between 
ABS and PVC building drain or building sewer 
shall be made using a listed transition solvent 
cement. 



316.1.7 Brazing and Welding. Brazing and 
welding shall conform to the applicable 
standard(s) in Table 14-1. Only brazing alloys 
having a liquid temperature above 1,000°F shall 
be used. All brazing on medical gas systems 
shall be performed by certified installers 
meeting the requirements of ANSI/ASME Boiler 
and Pressure Vessel Code, Section IX, Welding 
and Brazing Qualifications, or AWS B2.2, 
Standard for Brazing Procedure and Perfor- 
mance Qualifications. 

316.1.8 Pressure-Lock-Type Connection. Tliis 
is a mechanical connection that depends on an 
internal retention device to prevent pipe or 
tubing separation. Connection is made by 
inserting the pipe or tubing into the fitting to a 
prescribed depth. 

316.1.9 Pressed Fitting. This is a mechanical 
connection for joining copper tubing that uses a 
crimping tool to affix the O-ring seal copper or 
copper alloy fitting to the tubing. The tubing 
shall be inserted into the fitting, and the crimp 
shall be made using the tool recommended by 
the manufacturer. 

316.2 Special Joints. 

316.2.1 Copper Tubing to Screw Pipe Joints. 

Joints from copper tubing to threaded pipe shall be 
made by tlie use of brass adapter fittings. The joint 
between the copper tubing and the fitting shall be 
a soldered brazed flared, or pressed joint and the 
connection between the threaded pipe and the 
fitting shall be made with a standard pipe size 
screw joint. Solder shall conform to the require- 
ments of Section 316.1.3. Brazed joints shall conform 
to the requirements of Section 316.1.7. Flared joints 
shall conform to the requirements of Section 316.1.4. 
Pressed joints shaU conform to tlie requirements of 
316.1.9. 

316.2.2 Unions. Approved unions may be used 
in drainage piping when accessibly located in 
the trap seal or between a fixture and its trap in 
the vent system, except underground or in wet 
vents, at any point in the water supply system, 
and in gas piping as permitted by Section 
1211.3.2(4). 

316.2.3 Plastic Pipe to Other Materials. When 
connecting plastic pipe to other types of piping, 
only approved types of fittings and adapters 
designed for the specific transition intended 
shall be used. 

316.3 Flanged Fixture Connections. 

316.3.1 Fixture connections between drainage 
pipes and water closets, floor outlet service sinks 
and urinals shall be made by means of approved 
brass, hard lead, ABS, PVC, or iron flanges 



26 



GENERAL REGULATIONS 



316.3-320.0 



caulked, soldered, solvent cemented; rubber 
compression gaskets; or screwed to the drainage 
pipe. The connection shall be bolted with an 
approved gasket, washer, or setting compound 
between the fixture and the connection. The bottom 
of the flange shall be set on an approved firm base. 

31 6.3.2 Closet bends or stubs shall be cut off so as 
to present a smooth surface even with the top of 
the closet ring before rough inspection is called. 

316.3.3 Wall-mounted water closet fixtures shall 
be securely bolted to an approved carrier fitting. 
The cormecting pipe between the carrier fitting 
and the fixture shall be an approved material 
and designed to accommodate an adequately 
sized gasket. Gasket material shall be neoprene, 
felt, or similar approved types. 

316.4 Prohibited Joints and Connections. 

316.4.1 Drainage System. Any fitting or 
connection that has an enlargement, chamber, 
or recess with a ledge, shoulder, or reduction of 
pipe area that offers an obstruction to flow 
through the drain shall be prohibited. 

316.4.2 No fitting or connection that offers 
abnormal obstruction to flow shall be used. The 
enlargement of a three (3) inch (80 mm) closet 
bend or stub to four (4) inches (100 mm) shall 
not be considered an obstruction. 

317.0 increasers and Reducers. 

Where different sizes of pipes and fittings are to be 
connected, the proper size increasers or reducers or 
reducing fittings shall be used between the two sizes. 
Brass or cast-iron body cleaniouts shall not be used as 
a reducer or adapter from cast-iron drainage pipe to 
iron pipe size (IPS) pipe. 

318.0 Food-Handling Establishments. 

Food or drink shall not be stored, prepared, or 
displayed beneath soil or drain pipes, unless those 
areas are protected against leakage or condensation 
from such pipes reaching the food or drink as 
described below. Where building design requires 
that soil or drain pipes be located over such areas, 
the installation shall be made with the least possible 
number of joints and shall be installed so as to 
connect to the nearest adequately sized vertical stack 
with the provisions as follows: 

318.1 All openings through floors over such 
areas shall be sealed watertight to the floor 
construction. 

318.2 Floor and shower drains installed above 
such areas shall be equipped with integral 
seepage pans. 



318.3 All other soil or drain pipes shall be of an 
approved material as listed in Table 14-1 and Section 
701.0. All materials shall conform to established 
standards. Cleanouts shall be extended through the 
floor construction above. 

318.4 Piping subject to operation at temperatures 
that will form condensation on the exterior of the 
pipe shall be thermally insulated. 

318.5 Where pipes are installed in ceilings above 
such areas, the ceiling shall be of the removable 
type, or shall be provided with access panels in order 
to form a ready access for inspection of piping. 

319.0 Test Gauges. Tests required by this code, 
which are performed utilizing dial gauges, shall be 
limited to gauges having the following pressure 
graduations or incrementations. 

319.1 Required pressure tests of ten (10) psi (69 kPa) 
or less shall be performed with gauges of 1/10 
pound (0.7 kPa) incrementation or less. 

319.2 Required pressure tests exceeding ten (10) 
pounds (69 kPa) but less than one hundred (100) 
psi (689 kPa) shall be performed with gauges of 
one (1) psi (6.9 kPa) incrementation or less. 

319.3 Required pressure tests exceeding one 
himdred (100) psi (689 kPa) shall be performed with 
gauges incremented for two (2) percent or less of the 
required test pressure. 

319.4 Test gauges shall have a pressure range not 
greater than twice the test pressure applied. 

320.0 Medical Gas and Vacuum Systems. All such 
piping shall be installed, tested, and verified in 
compliance with the appropriate consensus 
standards referenced in Chapter 14 and the 
requirements of Chapter 13. The Authority Having 
Jurisdiction shall require evidence of the competency 
of the installers and verifiers. 



27 



Table 3-2 



UNIFORM PLUMBING CODE 



TABLE 3-2 
Hangers and Supports 



Materials 



Types of Joints 



Horizontal 



Vertical 



Cast 



Lead and Oakum 



Compression Gasket 



5 feet (1 ,524 mm), except may be 
10 feet (3,048 mm) where 10 foot 
lengths are installed '^^ 

Every other joint, unless over 4 feet 
(1,219 mm), then support each joint 



Base and each floor not to 
exceed 15 feet (4,572 mm) 

Base and each floor not to 
exceed 1 5 feet (4,572 mm) 



Cast-Iron Hubless 


Shielded Coupling 


Every other joint, unless over 4 feet 
(1,219 mm), then support each joint '^^■'' 


Base and each floor not to 
exceed 15 feet (4,572 mm) 


Copper Tube and Pipe 


Soldered or Brazed 


1-1/2 inches (40 mm) and smaller, 6 feet 
(1 ,829 mm), 2 inches (50 mm) and larger, 
10 feet (3,048 mm) 


Each floor, not to exceed 
10 feet (3,048 mm)= 


Steel and Brass Pipe for 
Water or DWV 


Threaded or Welded 


3/4 inch (20 mm) and smaller, 1 feet 
(3,048 mm), 1 inch (25 mm) and larger, 
12 feet (3,658 mm) 


Every other floor, not to 
exceed 25 feet (7,620 mm)' 



Steel, Brass, and Tinned Threaded or Welded 
Copper Pipe for Gas 



1/2 inch (15 mm), 6 feet (1829 mm), 
3/4 inch (20 mm) and 1 inch (25.4 mm) 
8 feet (2,438 mm, 1-1/4 inch (32 mm) 
and larger, 10 feet (3,048 mm) 



1/2 inch (12.7 mm), 6 feet 
(1 ,829 mm), 3/4 inch (19 mm) 
and 1 inch (25.4 mm), 8 
feet (2,438 mm), 1-1/4 
every floor level 



Schedule 40 PVC and Solvent Cemented 

ABS DWV 



All sizes, 4 feet (1 ,219 mm). Allow for 
expansion every 30 feet (9,144 mm).^* 



Base and each floor. Provide 
mid-story guides. Provide 
for expansion every 30 
feet (9,144 mm).» 



CPVC 


Solvent Cemented 


1 inch (25 mm) and smaller, 3 feet 
(914 mm), 1-1/4 inch (932 mm) and 
larger, 4 feet (1 ,219 mm) 


Base and each floor. Provide 
mid-story guides. ^ 


Lead 


Wiped or Burned 


Continuous Support 


Not to exceed 4 feet 
(1,219 mm) 


Copper 


Mechanical 


In accordance with standards acceptable to the Authority Having Jurisdiction 


Steel and Brass 


Mechanical 


In accordance with standards acceptable to the Authority Having Jurisdiction 


PEX 


Metal Insert and 
Metal Compression 


32 inches (800 mm) 


Base and each floor. 
Provide mid-story guides. 


PEX-AL-PEX 


Metal Insert and 
Metal Compression 


1/2 inch (12 mm) 1 All sizes 
3/4 inch (20 mm) > 98 inches 
1 inch (25 mm) J (2,489 mm) 


Base and each floor. 
Provide mid-story guides. 


PE-AL-PE 


Metal Insert and 
Metal Compression 


1/2 inch (12 mm) 1 All sizes 
3/4 inch (20 mm) J 98 inches 
1 inch (25 mm) (2,489 mm) 


Base and each floor. 
Provide midstory guides. 



Support adjacent to joint, not to exceed eighteen (18) Inches (457 mm). 

Brace at not more than forty (40) foot (12,192 mm) inten/als to prevent horizontal movement. 

Support at each horizontal branch connection. 

Hangers shall not be placed on the coupling. 

Vertical water lines may be supported in accordance with recognized engineering principles with regard to expansion and contraction, when first 

approved by the Authority Having Jurisdiction. 

See the appropriate lAPMO Installation Standard for expansion and other special requirements. 



28 



CHAPTER 4 

PLUMBING FIXTURES AND FIXTURE FITTINGS 



401 .0 Materials - General Requirements. 

401.1 Quality of Fixtures. Plumbing fixtures shall be 
constructed of dense, durable, non-absorbent materials 
and shall have smooth, impervious surfaces, free from 
unnecessary concealed fouling surfaces. Except as 
permitted elsewhere in this code, all fixtures shall 
conform in quality and design to nationally recognized 
applicable standards included in Table 14-1. 

401.2 Lead. See Table 14-1. Sheet lead shall be not 
less than the following: 

For safe pans not less than four (4) pounds per square 
foot (19.5 kg/m') or 1/16 inch (1.6 mm) thick. 

401.3 Plumbing fixture fittings covered under the 
scope of NSF 61 shall comply with the requirements of 
NSF61. 

402.0 Water-Conserving Fixtures and Fittings. 

402.1 Flush volumes for low-consumption and 
water-saver water closets and urinals shall be in 
accordance with applicable standards referenced 
in Table 14-1. 

402.2 Water Closets. Water closets, either flush 
tank, flushometer tank, or flushometer valve 
operated, shall have an average consumption of 
not more than 1.6 gallons (6.1 liters) of water per flush. 

402.3 Urinals. Urinals shall have an average water 
consumption of not more than 1.0 gallon (3.8 liters) of 
water per flush. 

402.4 Metered Faucets. Self-closing or self-closing 
metering faucets shall be installed on lavatories 
intended to serve the transient public, such as those in, 
but not limited to, service stations, train stations, 
airports, restaurants, and convention halls. Metered 
faucets shall deliver not more than 0.25 gallons (1.0 
liter) of water per use. 

402.5 Emergency Safety Showers. Emergency 
safety showers shall not be limited in their water 
supply flow rates. 

402.6 Installation. Water-conserving fixtures 
shall be installed in strict accordance with the 
manufacturers' instructions to maintain their 
rated performance. 

403.0 Overflows. 

When any fixture is provided with an overflow, the 
waste shall be so arranged that the standing water in 
the fixture cannot rise in the overflow when the 
stopper is closed or remain in the overflow when the 



fixture is empty. The overflow pipe from a fixture 
shall be cormected on the house or inlet side of the 
fixture trap, except that overflow on flush tax\ks may 
discharge into the water closets or urinals served by 
them, but it shall be unlawful to connect such 
overflows with any other part of the drainage system. 

404.0 Strainers and Connections. 

404.1 Strainers. All plumbing fixtures, other 
than water closets and urinals, shall be equipped 
with approved strainers having an approved 
waterway area. Strainers serving shower drains 
shall have a waterway equivalent to the area of 
the tailpiece. 

404.2 Connections. Fixtures having concealed 
slip joint connections shall be provided with an 
access panel or utility space at least twelve (12) 
inches (305 mm) in its least dimension and so 
arranged without obstructions as to make such 
connections accessible for inspection and repair. 

404.3 Continuous wastes and fixture tailpieces shall 
be constructed from the materials specified in Section 
701.0 for drainage piping, provided, however, that 
such connections where exposed or accessible may be 
of seamless drawn brass not less than No. 20 B&S 
Gauge (0.032 inches) (0.8 mm). Each such tailpiece, 
continuous waste, or waste and overflow shall not be 
less than one and one-half (1-1/2) inches (40 mm) O.D. 
for sinks, dishwashers, laundry tubs, bathtubs, urinals, 
and similar fixtures, and not less than one and one 
quarter (1-1 /4) inches (32 mm) for lavatories, drinking 
fountains, and similar small fixtures. 

404.4 Approved wye or other directional-type 
branch fittings shall be installed in all continuous 
wastes connecting or receiving the discharge from 
food waste disposal units, dishwashers, clothes 
washers, or other force discharge fixtures or 
appliances. No dishwasher drain shall be connected to 
a sink tailpiece, continuous waste, or trap on the 
discharge side of a food waste disposal unit. 

405.0 Prohibited Fixtures. 

405.1 Water closets having an invisible seal or an 
unventilated space or having walls which are not 
thoroughly washed at each discharge shall be 
prohibited. Any water closet that might permit 
siphonage of the contents of the bowl back into the 
tank shall be prohibited. Drinking fountains shall not 
be installed in public toilet rooms. 



29 



405.2 - 408.2 



UNIFORM PLUMBING CODE 



405.2 Prohibited Urinals. Floor-type and wall-hung 
type trough urinals shall be prohibited. Urinals that have 
an invisible seal or that have an unventilated space or 
wall that is not thoroughly washed at each discharge 
shall be prohibited. 

405.3 Fixed wooden, or tile wash trays or sinks for 
domestic use shall not be installed in any building 
designed or used for human habitation. No sheet 
metal-lined wooden bathtub shall be installed or 
reconnected. No dry or chemical closet (toilet) shall be 
installed in any building used for human habitation, 
unless first approved by the Health Officer. 

406.0 Special Fixtures and Specialties. 

406.1 Water and Waste Connections. Baptisteries, 
ornamental and lily ponds, aquaria, ornamental 
fountain basins, and similar fixtures and specialties 
requiring water and /or waste connections shall be 
submitted for approval to the Authority Having 
Jurisdiction prior to installation. 

406.2 Restaurant kitchen and other special use sinks 
may be made of approved-type bonderized and 
galvanized sheet steel of not less than No. 16 U.S. 
gauge (0.0625 inches) (1.6 mm). All sheet-metal 
plumbing fixtures shall be adequately designed, 
constructed, and braced in an Approved manner to 
satisfactorily accomplish their intended purpose. 

406.3 Special Use Fixtures. Special use fixtures 
shall be made of one of the following: 

(A) Soapstone 

(B) Chemical stoneware 

(C) Copper-based alloy 

(D) Nickel-based alloy 

(E) Corrosion-resistant steel 

(F) Other materials suited for the intended use of the 
fixture. 

406.4 Zinc Alloy Components. Zinc alloy com- 
ponents shall meet the applicable nationally 
recognized standards and shall be used in accordance 
with their listing. 



designed, by screws or bolts of copper, brass, or other 
equally corrosion-resistant material. 

407.4 Wall-Hung Fixtures. Wall-hung fixtures shall 
be rigidly supported by metal supporting members so 
that no strain is transmitted to the connections. Flush 
tanks and similar appurtenances shall be secured by 
approved non-corrosive screws or bolts. 

407.5 Securing Floor-Mounted, Back-Outlet Water 
Closet Bowls. Floor-mounted, back-outlet water 
closet bowls shall be set level with an angle of runety 
(90) degrees (1.58 rad) between the floor and wall at 
the centerline of the fixture outlet. The floor and wall 
shall have a flat mounting surface for at least five (5) 
inches (127 mm) to the right and left of the fixture 
outlet centerline. The fixture shall be secured to the 
wall outlet flange or drainage connection and to the 
floor by corrosion-resistant screws or bolts. The closet 
flange shall be secured to a firm base. 

Where floor-mounted, back-outlet water closets 
are used, the soil pipe shall not be less than three (3) 
inches (80 mm) in diameter. Offset, eccentric, or 
reducing floor flanges shall not be used. 

407.6 Setting. Fixtures shall be set level and in 
proper alignment with reference to adjacent walls. 
No water closet or bidet shall be set closer than 
fifteen (15) inches (381 mm) from its center to any 
side wall or obstruction nor closer than thirty (30) 
inches (762 mm) center to center to any similar 
fixture. The clear space in front of any water closet or 
bidet shall not be less than twenty-four (24) inches 
(610 mm). No urinal shall be set closer than twelve 
(12) inches (305 mm) from its center to any side wall 
or partition nor closer than twenty-four (24) inches 
(610 mm) center to center. 

407.7 installations for Persons with Disabilities. 

Where facilities for persons with disabilities are 
required in applicable building regulations, the 
facilities shall be installed in accordance with those 
regulations. 

407.8 Supply Fittings. The supply lines and fittings 
for every plumbing fixture shall be so installed as to 
prevent backflow as required in Chapter 6. 



407.0 Installation. 

407.1 Cleaning. Plumbing fixtures shall be installed 
in a manner to afford easy access for repairs and 
cleaning. Where practical, all pipes from fixtures shall 
be run to the nearest wall. 

407.2 Joints. Where a fixture comes in contact with 
the wall or floor, the joint between the fixture and the 
wall or floor shall be made watertight. 

407.3 Securing Fixtures. Floor-outlet or floor- 
mounted fixtures shall be rigidly secured to the 
drainage connection and to the floor, when so 



408.0 Water Closets. 

408.1 Water closet bowls for public use shall be of the 
elongated type. In nurseries, schools, and other similar 
places where plumbing fixtures are provided for the 
use of children under six (6) years of age, water closets 
shall be of a size and height suitable for children's use. 
All water closets shall be equipped with seats as 
required below. 

408.2 Water Closet Seats. 

408.2.1 Water closet seats shall be of smooth, 
non-absorbent material. 



30 



PLUMBING FIXTURES AND FIXTURE FITTINGS 



408.2 - 41 1 .5 



408.2.2 All water closet seats, except those 
within dwelling units, shall be either of the open 
front type or have an automatic seat cover 
dispenser. 

408.2.3 Water closet seats shall be properly 
sized for the water closet bowl type. 

408.2.4 Seats for use in public buildings shall 
conform to the standard listed in Table 14-1. 

409.0 Urinals. 

Every water supply to a urinal shall be protected by 
an approved-type vacuum breaker or other 
approved backflow prevention device as described 
in Section 603.3. 



410.0 Flushing Devices for Water Closets and 
Urinals. 

410.1 Flushing Devices Required. Each water 
closet, urinal, clinic sink, or other plumbing fixture 
that depends on trap siphonage to discharge its waste 
contents shall be provided with a flushometer valve, 
flushometer tank, or flush tank designed and installed 
so as to supply water in sufficient quantity and rate of 
flow to flush the contents of the fixture to which it is 
connected, to cleanse the fixture, and to refill the 
fixture trap, without excessive water use. Flushing 
devices shall meet anti-siphon requirements required 
in Chapter 6. 

410.2 Automatic Flushing Tanks. Tanks flushing 
more than one (1) urinal shall be automatic in 
operation and of sufficient capacity to provide the 
necessary volume to flush and properly cleanse all 
urinals simultaneously. Automatically controlled 
flushometer valves may be substituted for flush tanks. 

410.3 Flushometer Valves. No manually controlled 
flushometer valve shall be used to flush more than 
one (1) urinal, and each such urinal flushometer valve 
shall be an approved, self-closing type discharging a 
predetermined quantity of water. Flushometers shall 
be installed so that they will be accessible for repair. 
Flushometer valves shall not be used where the water 
pressure is insufficient to properly operate them. 
When the valve is operated, it shall complete the cycle 
of operation automatically, opening fully and closing 
positively under the line water pressure. Each 
flushometer shall be provided with a means for 
regulating the flow through it. 

410.4 Water Supply for Flush Tanks. An adequate 
quantity of water shall be provided to flush and clean 
the fixture served. The water supply for flushing tanks 
and flushometer tanks equipped for manual flushing 
shall be controlled by a float valve or other automatic 
device designed to refill the tar\k after each discharge 
and to completely shut off the water flow to the tank 



when the tank is filled to operational capacity. 
Provision shall be made to automatically supply water 
to the fixture so as to refill the trap seal after each 
flushing. The water supply to flush tanks equipped for 
automatic flushing shall be controlled by a suitable 
timing device. 

410.5 Overflows in Flush Tanks. Flush tariks shall 
be provided with overflows discharging into the 
water closet or urinal connected thereto. Overflows 
supplied as original parts with the fixture shall be of 
sufficient size to prevent tank flooding at the 
m.aximum rate at which the tank is supplied with 
water under normal operating conditions and when 
installed per manufacturer's instructions. 

411.0 Floor Drains and Shower Stalls. 

411.1 Floor drains shall be considered plumbing 
fixtures, and each such drain shall be provided with 
an approved-type strainer having a waterway 
equivalent to the area of the tailpiece. Floor drains, 
floor receptors, and shower drains shall be of an 
approved type, suitably flanged to provide a 
watertight joint in the floor. 

411.2 Location of Floor Drains. Floor drains shall 
be installed in the following areas; 

411.2.1 Toilet rooms containing two (2) or 
more water closets or a combination of one (1) 
water closet and one (1) urinal, except in a 
dwelling unit. 

41 1 .2.2 Commercial kitchens. 

41 1 .2.3 Laundry rooms in commercial buildings 
and common laundry facilities in multi-family 
dwelling buildings. 

41 1 .3 Food Storage Areas. If drains are provided in 
storerooms, walk-in freezers, walk-in coolers, 
refrigerated equipment, or other locations where food 
is stored, such drains shall have indirect waste piping. 
Separate waste pipes shall be run from each food 
storage area, each with an indirect cormection to the 
building sanitary drainage system. Traps shall be 
provided if required under Section 801.2.2 of this code 
and shall be vented. 

Indirect drains may be located in freezers or other 
spaces where freezing temperatures are maintained, 
provided that traps, when supplied, are located where 
the seal will not freeze. Otherwise, the floor of the 
freezer shall be sloped to a floor drain located outside 
of the storage compartment. 

41 1 .4 Floor Slope. Floors shall be sloped to floor drains. 

411.5 Shower receptors are plumbing fixtures and 
shall conform to the general requirements contained 
in Section 401.0. Each such shower receptor shall be 
constructed of vitrified china or earthenware, ceramic 
tile, porcelain-enameled metal, or of such other 



31 



411.5-411.8 



UNIFORM PLUMBING CODE 



TIA 
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TIA 
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TIA 
TIA 
TIA 
TIA 
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TIA 
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material as may be acceptable to the Authority Having 
Jurisdiction. No shower receptor shall be installed 
unless it conforms to acceptable standards as 
referenced in Table 14-1 or until a specification or a 
prototype or both of such receptor has first been 
submitted to and approval obtained from the 
Authority Having Jurisdiction. 

41 1 .6 Each shower receptor shall be an approved type 
and be so constmcted as to have a finished dam, curb, 
or threshold that is at least one (1) inch (25.4 mm) lower 
than the sides and back of such receptor. In no case 
shall any dam or threshold be less than two (2) inches 
(51 mm) or more than nine (9) inches (229 mm) in 
depth when measured from the top of the dam or 
threshold to the top of the drain. Each such receptor 
shall be provided with an integral nailing flange to be 
located where the receptor meets the vertical surface 
of the finished interior of the shower compartment. 
The flange shall be watertight and extend vertically a 
minimum of one (1) inch (25.4 mm) above the top of 
the sides of the receptor. The finished floor of the 
receptor shall slope uniformly from the sides toward 
the drain not less than one-quarter (1/4) inch per foot 
(20.9 mm/m), nor more than one-half (1/2) inch per 
foot (41.8 mm/m). Thresholds shall be of sufficient 
width to accommodate a minimum twenty-two (22) 
inch (559 mm) door. Shower doors shall open so as to 
maintain a minimum twenty-two (22) inch (559 mm) 
unobstructed opening for egress. 

Exception: Showers that are designed to 
comply with the accessibility standards listed in 
Table 14-1. 

41 1 .7 All shower compartments, regardless of shape, 
shall have a minimum finished interior of one 
thousand twenty-four (1,024) square inches (0.66 m^) 
and shall also be capable of encompassing a thirty (30) 
inch (750 mm) circle. The minimum required area and 
dimensions shall be measured at a height equal to the 
top of the threshold and at a point tangent to its 
centerline. The minimum area and dimensions shall 
be maintaiined to a point seventy (70) inches (1778 
mm) above the shower drain outlet with no 
protrusions other than the fixture valve or valves, 
shower head, soap dishes, shelves, and safety grab 
bars or rails. Fold-down seats in accessible shower 
stalls shall be permitted to protrude into the thirty (30) 
inch (750 mm) circle. 

Exception No. 1: Showers that are designed to 
comply with ICC/ANSI A117.1. 

Exception No. 2: The minimum required area 
and dimension shall not apply where an existing 
bathtub is replaced by a shower receptor having 
minimum overall dimensions of 30 inches (750 
mm) in width and 60 inches (1,500 mm) in length. 

411.8 When the construction of on-site built-up 
shower receptors is permitted by the Authority 



Having Jurisdiction, one of the following means shall 
be employed: 

(1) Shower receptors built directly on the 
ground: 

Shower receptors built directly on the ground 
shall be watertight and shall be constructed 
from approved-type dense, nonabsorbent 
and noncorrosive materials. Each such 
receptor shall be adequately reinforced, shall 
be provided with an approved, flanged floor 
drain designed to make a watertight joint in 
the floor, and shall have smooth, impervious, 
and durable surfaces. 

(2) Shower receptors built aboveground: 

When shower receptors are built above- 
ground, the subfloor and rough side of 
walls to a height of not less than three (3) 
inches (76 mm) above the top of the finished 
dam or threshold shall be first lined with 
sheet plastic,* lead,* or copper,* or shall be 
lined with other durable and watertight 
materials. 

All lining materials shall be pitched one- 
quarter (1/4) inch per foot (20.9 mm/m) to weep 
holes in the subdrain of a smooth and solidly 
formed subbase. All such lining materials shall 
extend upward on the rough jambs of the 
shower opening to a point no less than three (3) 
inches (76 mm) above the top of the finished 
dam or threshold and shall extend outward over 
the top of the rough threshold and be turned 
over and fastened on the outside face of both the 
rough threshold and the jambs. 

Nonmetallic shower subpans or linings 
may be built up on the job site of not less than 
three (3) layers of standard, grade fifteen (15) 
pound (6.8 kg) asphalt-impregnated roofing 
felt. The bottom layer shall be fitted to the 
formed subbase and each succeeding layer 
thoroughly hot-mopped to that below. All 
corners shall be carefully fitted and shall be 
made strong and watertight by folding or 
lapping, and each corner shall be reinforced 
with suitable webbing hot-mopped in place. 
All folds, laps, and reinforcing webbing shall 
extend at least four (4) inches (102 mm) in all 
directions from the corner, and all webbing 
shall be of approved type and mesh, producing a 
tensile strength of not less than fifty (50) psi 
(344.5 kPa) in either direction. Nonmetallic 
shower subpans or linings may also consist of 
multilayers of other approved equivalent 
materials suitably reinforced and carefully 
fitted in place on the job site as elsewhere 
required in this section. 



32 



PLUMBING FIXTURES AND FIXTURE FITTINGS 



411.8-412.5 



Linings shall be properly recessed and 
fastened to approved backing so as not to 
occupy the space required for the wall covering 
and shall not be nailed or perforated at any 
point that may be less than one (1) inch (25.4 
mm) above the finished dam or threshold. An 
approved-type subdrain shall be installed with 
every shower subpan or lining. Each such sub- 
drain shall be of the type that sets flush with the 
subbase and shall be equipped with a clamping 
ring or other device to make a tight connection 
between the lining and the drain. The subdrain 
shall have weep holes into the waste line. The 
weep holes located in the subdrain clamping 
ring shall be protected from clogging. 

All shower lining materials shall conform to 
approved standards acceptable to the Authority 
Having Jurisdiction. 



*Lead and copper subpans or linings shall be insulated 
from all conducting substances other than their 
connecting drain by fifteen (15) pound (6.8 kg) asphalt 
felt or its equivalent, and no lead pan or liner shall be 
constructed of material weighing less than four (4) 
pounds per square foot (19.5 kg/m^). Copper pans or 
liners shall be at least No. 24 B & S Gauge (0.02 inches) 
(0.5 mm). Joints in lead pans or liners shall be burned. 
Joints in copper pans or liners shall be soldered or 
brazed. Plastic pans shall not be coated with asphalt- 
based materials. 

411.8.1 Tests for Shower Receptors. Shower 
receptors shall be tested for watertightness by 
filling with water to the level of the rough 
threshold. The test plug shall be so placed that 
both upper and under sides of the subpan shall 
be subjected to the test at the point where it is 
clamped to the drain. 

41 1 .9 Floors of public shower rooms shall have a 
nohskid surface and shall be drained in such a 
manner that wastewater from one bather will not 
pass over areas occupied by other bathers. Gutters in 
public or gang shower roorhs shall have rounded 
corners for easy cleaning and shall be sloped not less 
than two (2) percent toward drains. Drains in gutters 
shall be spaced not more than eight (8) feet (2438 
mm) from sidewalls nor more than sixteen (16) feet 
(4879 mm) apart. 

411.10 Location of Valves and Heads. Control 
valves and showerheads shall be located on the 
sidewall of shower compartments or be otherwise 
arranged so that the showerhead does not discharge 
directly at the entrance to the compartment and the 
bather can adjust the valves prior to stepping into the 
shower spray. 



411.11 Water Supply Riser. Every water supply 
riser from the shower valve to the showerhead outlet, 
whether exposed or not, shall be securely attached to 
the structure. 

412.0 Minimum Number of Required Fixtures. 

412.1 Fixture Count. Plumbing fixtures shall be 
provided for the type of building occupancy and 
in the minimum number shown in Table 4-1. 

412.2 Access to Fixtures. 

412.2.1 In multi-story buildings, accessibility to 
the required fixtures shall not exceed one (1) 
vertical story. 

412.2.2 Fixtures accessible only to private offices 
shall not be counted to determine compliance 
with this section. 

412.3 Separate Facilities. 

Separate toilet facilities shall be provided for each sex. 
Exceptions: 

(1) Residential installations. 

(2) In occupancies serving ten (10) or fewer 
people, one (1) toilet facility, designed for 
use by no more than one (1) person at a 
time, shall be permitted for use by both 
sexes. 

(3) In business and mercantile occupancies with 
a total floor area of fifteen hundred (1500) 
square feet (139.5 m^) or less, one (1) 
toilet facility, designed for use by no more 
than one (1) person at a time, shall satisfy 
the requirements for serving customers and 
employees of both sexes. 

412.4 Fixture Requirements for Special Occupancies. 

412.4.1 Additional fixtures may be required 
when unusual environmental conditions or 
special activities are encountered. 

412.4.2 In food preparation areas, fixture 
requirements may be dictated by health codes. 

41 2.4.3 Types of occupancy not shown in Table 
4-1 shall be considered individually by the 
Authority Having Jurisdiction. 

412.5 Facilities in Mercantile and Business 
Occupancies Serving Customers. 

412.5.1 Requirements for customers and 
employees shall be jpermitted to be met with a 
single set of restrooms accessible to both groups. 
The required number of fixtures shall be the 
greater of the required number for employees or 
the required number for customers. 

412.5.2 Fixtures for customer use shall be 
permitted to be met by providing a centrally 



33 



412.5-418.0 



UNIFORM PLUMBING CODE 



located facility accessible to several stores. The 
maximum distance from entry to any store to 
this facility shall not exceed five hundred (500) 
feet (152.4 m). 

412.5.3 In stores with a floor area of one 
hundred fifty (150) square feet (13.9 m^) or 
less, the requirement to provide facilities for 
employees shall be permitted to be met by 
providing a centrally located facility accessible 
to several stores. The maximum distance from 
entry to any store to this facility shall not 
exceed three hundred (300) feet (91.4 m). 

412.6 Food Service Establishments. Food service 
establishments with an occupant load of one hundred 
(100) or more shall be provided with separate faicilities 
for employees and customers. Customer and 
employee facilities may be combined for occupant 
loads less than one hundred (100). 

412.7 Toilet Facilities for Workers. 

Suitable toilet facilities shall be provided and 
maintained in a sanitary condition for the use of 
workers during construction. 

413.0 Fixtures and Fixture Fittings for Persons 
with Disabilities. 

Plumbing fixtures and fixture fittings for persons with 
disabilities shall conform to the appropriate standards 
referenced in Table 14-1 of this code. - 

413.1 Limitation of Hot Water Temperature for 
Public Lavatories. 

Hot water delivered from public-use lavatories shall 
be limited to a maximum temperature of 120°F. The 
water heater thermostat shall not be considered a 
control for meeting this provision. 

414.0 Bathtubs and Whirlpool Bathtubs. 

I Unless otherwise listed, all bathtubs and whirlpool 
bathtubs shall comply with the following requirements: 

414.1 A removable panel shall be provided to access 
and remove the pump. Whirlpool pump access 
located in the crawl space shall be located no more 
than twenty (20) feet (6096 mm) from an access door, 
trap door, or crawl hole. 

414.2 The circulation pump shall be located above the 
crown weir of the trap. 

414.3 The pump and the circulation piping shall be 
self-draining to minimize water retention in 
accordance with standards referenced in Table 14-1. 

414.4 Suction fittings on whirlpool bathtubs shall 
comply with the listed standards. 

414.5 Limitation of Hot Water in Bathtubs and 
Whirlpool Bathtubs. The maximum hot water 
temperature discharging from the bathtub and 



whirlpool bathtub filler shall be Limited to 120°F. The 
water heater thermostat shall not be considered a 
control for meeting this provision. 

415.0 Installation of Fixture Fittings. 

Where two separate handles control the hot and cold 
water, the left-hand control of the faucet when facing 
the fixture fitting outlet shall provide the means to 
alter the hot water temperature from the fixture fitting. 

Single-handle mixing valves shall have the flow of 
hot water correspond to the markings on the fitting. 

416.0 Bidets. 

416.1 Materials. Bidets shall conform to the 
standards listed in Table 14-1. 

416.2 Backflow Protection. The water supply to the 
bidet shall be protected according to Chapter 6, which 
allows for an airgap or vacuum breaker. 

417.0 Future Fixtures. 

When provision is made for the future installation of 
fixtures, those provided for shall be considered in 
determining the required sizes of drain pipes. 
Construction for future installations shall be 
terminated with a plugged fitting or fittings. Where 
the plugged fitting is at the point where the trap of a 
fixture may be installed, the plumbing system for such 
fixture shall be complete and conform with all 
plumbing requirements of this code. 

418.0 Shower and Tub-Shower Combination 
Control Valves. 

Showers and tub-shower combinations in all buildings 
shall be provided with individual control valves of the 
pressure balance, thermostatic, or combination 
pressure balance/ thermostatic mixing valve type that 
provide scald and thermal shock protection. These 
valves shall conform to ASSE 1016. Gang showers, 
when supplied with a single temperature-controlled 
water supply pipe, may be controlled by a master 
thermostatic mixing valve in lieu of individually 
controlled pressure balance, thermostatic, or 
combination pressure balance /thermostatic mixing 
valves. Handle position stops shall be provided on 
such valves and shall be adjusted per the 
manufacturer's instructions to deliver a maximum 
mixed water setting of 120°F (49°C). The water heater 
thermostat shall not be considered a suitable control 
for meeting this provision. 



34 



PLUMBING FIXTURES AND FIXTURE FITTINGS 



Table 4-1 



TABLE 4-1 
Minimum Plumbing Facilities^ 

Each building shall be provided with sanitary facilities, including provisions for persons with disabilities as prescribed by the Department Having Jurisdiction. For 
requirements for persons with disabilities, ICC/ANSI A1 17.1 , Accessible and Usable Buildings and Facilities, may be used. 

The total occupant load shall be determined by minimum exiting requirements. The minimum number of fixtures shall be calculated at fifty (50) percent male and 
fifty (50) percent female based on the total occupant load. 

The occupant load and use of the building or space under consideration shall first be established using the Occupant Load Factor Table A. Once the occupant 
load and uses are determined, the requirements of Section 412.0 and Table 4-1 shall be applied to determine the minimum number of plumbing fixtures required. 

This table applies to new buildings, additions to a building, changes of occupancy or type in an existing building resulting in increased occupant load (example: 
change an assembly room from fixed seating to open seating). Exception: New cafeterias for employee use are the only use exempted from this requirement. 



Type of Building 


Water Closets" 


Urinals^" 


Lavatories 


Bathtubs or Showers 


Drinking Fountains^ '*'= 


or Occupancy^ 


(Fixtures per Person) 


(Fixtures per Person) 


(Fixtures per Person) 


(Fixtures per Person) 


(Fixtures per Person) 


Assembly places - 


Male Female 


Male 


Male Female 






theatres, auditoriums. 


1:1-15 1:1-15 


0:1-9 


1 per 40 1 per 40 






convention halls, etc- 


2:16-35 3:16-35 


1:10-50 








for permanent 


3: 36-55 4: 36-55 


Add one fixture 








employee use 


Over 55, add 1 fixture 
for each additional 40 
persons. 


for each 
additional 50 males. 








Assembly places - 


Male Female 


Male 


Male Female 






theatres, auditoriums. 


1:1-100 3:1-50 


1:1-100 


1:1-200 1:1-200 




1:1-150 


convention Halls, etc. - 


2:101-200 4:51-100 


2:101-200 


2:201-400 2:201-400 




2:151-400 


for public use 


3:201-400 8:101-200 


3:201-400 


3:401-750 3:401-750 




3:401-750 




11:201-400 


4:401-600 


Over 750, add one fixture 




Over 750, add one fixture 




Over 400, add one fixture 


Over 600, add 1 fixture 


for each additional 500 




for each additional 500 




for each additional 500 


for each additional 


persons. 




persons. 




males and 1 for each 


300 males. 










additional 125 females. 










Dormitories'- 


Male Female 


Male 


Male Female 


1 per 8 


1 per 150'^ 


School or labor" 


1 per 10 1 per 8 


1 per 25 


1 per 12 1 per 12 


For females, add 






Add 1 fixture for each 


Over 150, add 1 fixture 


Over 12, add one fixture fo 


1 bathtub per 30. 






additional 25 males (over 


for each additional 50 


each additional 20 males 


Over 150, add 1 






10) and 1 for each additional 


males. 


and 1 for each 15 


bathtub per 20. 






20 females (over 8). 




additional females. 






Dormitories - 


Male Female 


Male 


Male Female 


1 per 8 




for staff use" 


1:1-15 1:1-15 
2:16-35 3:16-35 
3: 36-55 4: 36-55 
Over 55, add 1 fixture for 
each additional 40 persons. 


1 per 50 


1 per 40 1 per 40 






Dwellings^ 












Single dwelling 


1 per dwelling 




1 per dwelling 


1 per dwelling 




Multiple dwelling or 


1 per dwelling or 




1 per dwelling or 


1 per dwelling or 




apartment house" 


apartment unit 




apartment unit 


apartment unit 




Hospital waiting rooms 


1 per room 




1 per room 




1 per150'' 


Hospitals - 


Male Female 


Male 


Male Female 






for employee use 


1:1-15 1:1-15 
2:16-35 3:16-35 
3: 36-55 4: 36-55 
Over 55, add 1 fixture for 
_. each additional 40j)e.rsons. 


0:1-9 

1:10-50 

Add one fixture for each 

additional 50 males. 


1 per 40 1 per 40 






Hospitals 












Individual room 


1 per room 




1 per room 


1 per room 




Ward room 


1 per 8 patients 




1 per 10 patients 


1 per 20 patients 


1 per 150" 


Industrial warehouses, 


Male Female 




Up to 100, 1 per 10 


1 shower for 


1 per 150" 


workshops, foundries. 


1:1-10 1:1-10 




persons 


each 15 persons 




and similar 


2:11-25 2:11-25 






exposed to 




establishments - 


3: 26-50 3: 26-50 




Over 100, 1 per 15 


excessive heat or 




for employee use 


4:51-75 4:51-75 
5:76-100 5:76-100 
Over 100, add 1 fixture for 
each additional 30 persons. 




persons'" 


to skin contam- 
ination with poison- 
ous, infectious, or 
irritating material 




Institutional - other than 


Male Female 


Male 


Male Female 


1 per 8 


1 per 150" 


hospitals or penal 


1 per 25 1 per 20 


0:1-9 


1 per 10 1 per 10 






institutions (on each 




1:10-50 








occupied floor) 




Add one fixture for each 
additional 50 males. 








Institutional - other than 


Male Female 


Male 


Male Female 


1 per 8 


1 per 1 50" 


hospitals or penal 


1:1-15 1:1-15 


0: 1-9 


1 per 40 1 per 40 






institutions (on each 


2:16-35 3:16-35 


1:10-50 








occupied floor) - 


3: 36-55 4: 36-55 


Add one fixture for each 








for employee use 


Over 55, add 1 fixture for 
each additional 40 persons. 


additional 50 males. 









35 



Table 4-1 continued 



UNIFORM PLUMBING CODE 



Type of Building 


Water Closets" 


Urinals*^" 


lavatories 


Bathtubs or Showers 


Drinking Fountains*" 


or Occupancy'' 


(Fixtures per Person) 


(Fixtures per Person) 


(Fixtures per Person) 


(Fixtures per Person) 


(Fixtures per Person) 


Office or public 


Male Female 


Male 


Male Female 




1 per 150" 


buildings 


1:1-100 3:1-50 


1:1-100 


1:1-200 1:1-200 








2:101-200 4:51-100 


2: 101-200 


2:201-400 2:201-400 








3:201-400 8:101-200 


3:201-400 


3:401-750 3:401-750 








11:201-400 


4:401-600 


Over 750, add one fixture 








Over 400, add one fixture 


Over 600, add 1 fixture for 


for each additional 500 








for each additional 500 


each additional 300 males. 


persons. 








males and 1 for each 












additional 150 females. 










Office or public 


Male Female 


Male 


Male Female 






buildings - 


1:1-15 1:1-15 


0: 1-9 


1 per 40 1 per 40 






for employee use 


2: 16-35 3: 16-35 
3: 36-55 4: 36-55 
Over 55, add 1 fixture for 
each additional 40 persons. 


1:10-50 

Add one fixture for each 

additional 50 males. 








Penal institutions - 


Male Female 


Male 


Male Female 




1 per 150'= 


for employee use 


1:1-15 1:1-15 
2:16-35 3:16-35 
3: 36-55 4: 36-55 
Over 55, add 1 fixture for 
each additional 40 persons. 


0:1-9 

1:10-50 

Add one fixture for each 

additional 50 males. 


1 per 40 1 per 40 






Penal institutions - 












for prison use 












Cell 


1 per cell 


Male 


1 per cell 




1 per cell block floor 


Exercise room 


1 per exercise room 


1 per exercise room 


1 per exercise room 




1 per exercise room 


1 Public or 


Same as Office or Public 


Same as Office or Public 


Same as Office or Public 




Same as Office or Public 


1 professional offices'^ 


Buildings for employee use 


Buildings for employee use'* 


Buildings for employee use 


5 


Buildings for employee use" 


Restaurants, pubs, and 


Male Female ' 


Male 


Male Female 






tounges"-^^-^ 


1:1-50 1:1-50 


1:1-150 


1:1-150 1:1-150 








2:51-150 2:51-150 


Over 150, add 1 fixture for 


2: 151-200 2: 151-200 








3:151-300 4:151-300 


each additional 150 males. 


3:201-400 3:201-400 








Over 300, add 1 fixture for 




Over 400, add 1 fixture for 








each additional 200 persons. 




each additional 400 persons. 






Retail or 


Male Female 


Male 


One for each two 




0:1-30" 


Wholesale Stores 


1:1-100 1:1-25 


0:0-25 


water closets 




1:31-150 




2:101-200 2:26-100 


1:26-100 






One additional drinking 




3:201-400 4:101-200 


2:101-200 






fountain for each 150 




6:201-300 


3:201-400 






persons thereafter 




8:301-400 


4:401-600 










Over 400, add one fixture for 


Over 600, add one fixture 










each additional 500 males and 


for each additional 










one for each 150 females 


300 males 








Schools - for staff use 


Male Female 


Male 


Male Female 






All schools 


1:1-15 1:1-15 
2: 16-35 2: 16-35 
3: 36-55 3: 36-55 
Over 55, add 1 fixture for 
each additional 40 persons. 


1 per 50 


1 per 40 1 per 40 






Schools - for student use 


Male Female 




Male Female 




1 per 150" 


Nursery 


1:1-20 1:1-20 
2:21-50 2:21-50 
Over 50, add 1 fixture for 
each additional 50 persons. 




1:1-25 1:1-25 
2: 26-50 2: 26-50 
Over 50, add 1 fixture for 
each additional 50 persons. 






Elementary 


Male Female 


Male 


Male Female 




1 perl 50" 




1 per 30 1 per 25 


1 per 75 


1 per 35 1 per 35 






Secondary 


Male Female 


Male 


Male Female 




1 per 150" 




1 per 40 1 per 30 


1 per 35 


1 per 40 1 per 40 






Others (colleges, 


Male Female 


Male 


Male Female 




1 per 150" 


universities, adult 


1 per 40 1 per 30 


1 per 35 


1 per 40 1 per 40 






centers, etc.) 












Worship places 


Male Female 


Male 


1 per 2 water closets 




1 per 150" 


educational and 


1 per 150 1 per 75 


1 per 150 








activities Unit 












Worship places 


Male Female 


Male 


1 per 2 water closets 




1 per 150" 


principal assembly place 


1 per 150 1 per 75 


1 per 150 









36 



PLUMBING FIXTURES AND FIXTURE FITTINGS 

^ The figureis shown are based upon one (1) fixture being the minimum required for the number of persons indicated or any 
fraction thereof. 

^ Building categories not shown on this table shall be considered separately by the Authority Having Jurisdiction. 

^ Drinking fountains shall not be installed in toilet rooms. 

" Laundry trays. One (1 ) laundry tray or one (1 ) automatic washer standpipe for each dwelling unit or one (1 ) laundry tray or one 
(1) automatic washer standpipe, or combination thereof, for each twelve (12) apartments. Kitchen sinks, one (1) for each 
dwelling or apartment unit. 

^ For each urinal added in excess of the minimum required, one water closet may be deducted. The number of water closets 
shall not be reduced to less than two-thirds (2/3) of the minimum requirement. 

^ As required by ANSI Z4.1 , Sanitation in Places of Employment. 

' Where there is exposure to skin contamination with poisonous, infectious, or irritating materials, provide one (1 ) lavatory for 
each five (5) persons. 

^ Twenty-four (24) lineal inches (610 mm) of wash sink or eighteen (18) inches (457 mm) of a circular basin, when provided with 
water outlets for such space, shall be considered equivalent to one (1 ) lavatory. 

^ Laundry trays, one (1) for each fifty (50) persons. Service sinks, one (1) for each hundred (100) persons. 

^° General. In applying this schedule of facilities, consideration shall be given to the accessibility of the fixtures. Conforiiiity purely 
on a numerical basis may not result in an installation suited to the needs of the individual establishment. For example, schools 
should be provided with toilet facilities on each floor having classrooms. 

a. Surrounding materials, wall, and floor space to a point two (2) feet (61 mm) in front of urinal lip and four (4) feet 
(1219 mm) above the floor, and at least two (2) feet (610 mm) to each side of the urinal shall be lined with non- 
absorbent materials. 

b. Trough urinals shall be prohibited. 

" A restaurant is defined as a business that sells food to be consumed on the premises. 

a. The number of occupants for a drive-in restaurant shall be considered as equal to the number of parking stalls. 

b. Employee toilet facilities shall not be included in the above restaurant requirements. Hand-washing facilities shall be 
available in the kitchen for employees. 

'^ Where food is consumed indoors, water stations may be substituted for drinking fountains. Offices, or public buildings for use 
by more than six (6) persons shall have one (1) drinking fountain for the first one hundred fifty (150) persons and one (1) 
additional fountain for each three hundred (300) persons thereafter. 

^^ There shall be a minimum of one (1) drinking fountain per occupied floor in schools, theatres, auditoriums, dormitories, offices, 
or public buildings. 

'" The total number of water closets for females shall be at least equal to the total number of water closets and urinals required 
for males. This requirement shall not apply to Retail or Wholesale Stores. 

For smaller-type Public and Professional Offices such as banks, dental offices, law offices, real estate offices, architectural 
offices, engineering offices, and similar uses. A public area in these offices shall use the requirements for Retail or Wholesale 
Stores. 

A unisex facility (one water closet and one lavatory) may be used when the customer occupant load for the dining area, 
including outdoor seating area, is 10 or less and the total number of employees for the space is 4 or less. 

Recreation or community room in multiple dwellings or apartment buildings, regardless or their occupant load, shall be 
permitted to have separate single-accommodation facilities in common-use areas within tracts or multi-family residential 
occupancies where the use of these areas is limited exclusively to owners, residents, and their guests. Examples are 
community recreation or multi-purpose areas in apartments, condos, townhouses, or tracts. 

A drinking fountain shall not be required in occupancies of 30 or less. When a drinking fountain is not required, then footnotes 
3,12, and 13 are not applicable. 



37 



Table A 



UNIFORM PLUMBING CODE 



Table A. Occupant Load Factor: 



Occupancy*, 



Occupant Load Factor (square feet) 
(CBC 2001 , Table A-29A) 



Group A 



3. 



Auditoriums, convention halls, dance floors, 

lodge rooms, stadiums, and casinos 

(use 1/2 "one-half" the number of fixed seating) 

Conference rooms, dining rooms, drinking 
establishments, exhibit rooms, gymnasiums, 
lounges, stages, and similar uses, including 
restaurants classified as Group B occupancies 

Worship places; principal assembly area, 

educational and activity unit 

(use 1/2 "one-half" the number of fixed seating) 



Group B 



Office or public buildings (area accessible to 
the public) 

Group E 

Schools for daycare, elementary, secondary 

Educational Facilities Other than Group E 

Colleges, universities, adult centers, etc. 



Group F 



Workshops, foundries and similar establishments 



Group H 



Hazardous materials fabrication and storage 



Group I 



Hospital general use area, health care facilities 



Group M 



Retail or Wholesale stores 



Group R 



Congregate residence. Group R-1 



Group S 



Warehouse 



15 
(where no fixed seating is provided) 



30 



30 
(where no fixed seating is provided) 

200 

50 

50 

2,000 

2,000 

200 

200 

200 

5,000 



Any uses not specifically listed shall be based on similar uses listed in this table. 

For building or space with mixed occupancies, use appropriate occupancy group for each area (for 

example, a school may have an "A" occupancy for the gymnasium, a "B" occupancy for the office, an 

"E" occupancy for the classrooms, etc.) 

Accessory areas may be excluded (for example: hallway, restroom, stair enclosure) 



38 



CHAPTER 5 

WATER HEATERS 



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NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Parti 



501.0 General. 

The regulations of this chapter shall govern the 
construction, location, and installation of fuel- 
burning and other water heaters heating potable 
water, together with all chimneys, vents, and their 
connectors. The minimum capacity for water heaters 
shall be in accordance with the first hour rating listed 
in Table 5-1. All design, construction, and work- 
manship shall be in conformity with accepted 
engineering practices, manufacturer's installation 
instructions, and applicable standards and shall be of 
such character as to secure the results sought to be 
obtained by this code. No water heater shall be 
hereinafter installed that does not comply in all 
respects with the type and model of each size thereof 
approved by the Authority Having Jurisdiction. A 
list of accepted gas equipment standards is included 
in Table 14-1. 

502.0 Definitions. 

502.1 Appliance Categorized Vent Diameter/Area. 

The minimum vent area /diameter permissible for 
Category I appliances to maintain a nonpositive vent 
static pressure when tested in accordance with 
nationally recogruzed standards. [NFPA 54: 3.3.7] 

502.2 Chimney. (See also Gas Vent, and Venting 
System.) One or more passageways, vertical or 
nearly so, for conveying flue or vent gases to the 
outside atmosphere. [NFPA 54: 3.3.17] 

502.3 Chimney, Factory-Built. A chimney composed 
of listed factory-built components assembled in 
accordance with the terms of listing to form the 
completed chinmey. [NFPA 54: 3.3.17.2] 

502.4 Chimney, Masonry. A field-constructed 
chimney of solid masonry units, bricks, stones, listed 
masonry chimney units, or reinforced portland 
cement concrete, lined with suitable chimney flue 
liners. [NFPA 54: 3.3.17.3] 



502.5 Chimney, Metal. A field-constructed chimney 
of metal. [NFPA 54: 3.3.17.4] 

502.6 Combustible Material. As pertaining to 
materials adjacent to or in contact with heat-producing 
appliances, vent connectors, gas vents, chimneys, steam 
and hot water pipes, and warm air ducts, shall mean 
materials made of or surfaced with wood, compressed 
paper, plant fibers, or other materials that are capable 
of being ignited and burned. Such material shall be 
considered combustible even though flame-proofed, 
ftre-retardant treated, or plastered. [NFPA 54: 3.3.65.1] 

502.7 Direct-Vent Appliances. Appliances that are 
constructed and installed so that all air for combustion 
is derived directly from the outside atmosphere and 
all flue gases are discharged to the outside 
atmosphere. [NFPA 54: 3.3.6.3] 

502.8 Flue Collar. That portion of an appliance 
designed for the attachment of a draft hood, vent 
connector, or venting system. [NFPA 54: 3.3.45] 

502.9 Gas Vent, Type B. A vent for venting-Usted 
gas appliances with draft hoods and other Category I 
appliances listed for use with Type B gas vents. 
[NFPA 54: 3.3.103.2.2] 

502.10 Gas Vent, Type L. A vent for venting 
appliances listed for use with Type L vents and 
appliances listed for use with Type B gas vents. 
[NFPA 54: 3.3.103.2.4] 

502.11 Indirect-Fired Water Heater. A water heater 
consisting of a storage tank equipped with an internal 
or external heat exchanger used to transfer heat from 
an external source to heat potable water. The storage 
tank may contain heated potable water or water 
supplied from an external source, such as a boiler. 

502.12 Vent. A passageway used to convey flue gases 
from gas utilization equipment or their vent connectors 
to the outside atmosphere. [NFPA 54: 3.3.103] 

502.13 Vent Connector. The pipe or duct that 
connects a fuel-gas-burning appliance to a vent or 
chimney. [NFPA 54: 3.3.104] 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 







TABLE 5-r FIRST HOUR RATING 










Number of Bathrooms 


1 to 1 .5 


2 to 2.5 


3 to 3.5 


Number of Bedrooms 


1 


2 


3 


2 


3 


4 


5 


3 


4 1 


5 


6 


First Hour Rating,^ Gallons 


42 


54 


54 


54 


67 


67 


80 


67 


80 


80 


80 



Note: 

1 The first hour rating is found on the "Energy Guide" lable. 

2 Non-storage and solar water heaters shall be sized to meet the appropriate first hour rating as shown in the table. 



39 



502.14-506.1 



UNIFORM PLUMBING CODE 



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502.14 Venting System. A continuous open 
passageway from the flue collar or draft hood of a 
gas-burning appliance to the outside atmosphere for 
the purpose of removing flue or vent gases. [NFPA 
54:3.3.96.6] 

502.15 Water Heater. An appliance for supplying hot 
water for domestic or commercial purposes. [NFPA 
54: 3.3.55.7] 



503.0 Permits. 

It shall be unlawful for any person to install, remove, or 
replace or cause to be installed, removed, or replaced 
any water heater without first obtaining a permit from 
the Authority Having Jurisdiction to do so. 

504.0 Inspection. 

504.1 Inspection of Chimneys or Vents. This 
inspection shall be made after all chimneys, vents, or 
parts thereof, authorized by the permit, have been 
installed and before any such vent or part thereof has 
been covered or concealed. 

504.2 Final Water Heater Inspection. This 
inspection shall be made after all work authorized by 
the permit has been installed. The Authority Having 
Jurisdiction will make such inspection as deemed 
necessary to be assured that the work has been 
installed in accordance with the intent of this code. 
No equipment or part thereof shall be covered or 
concealed until the same has been inspected and 
approved by the Authority Having Jurisdiction. 

505.0 Water Heater Requirements. 

505.1 Location. Water heater installations in bed- 
rooms and bathroom^s shall comply with one of the 
following [NFPA 54: 10.28.1]: 

(1) Fuel-burning water heaters may be installed in a 
closet located in the bedroom or bathroom provided 
the closet is equipped with a listed, gasketed door 
assembly and a listed self-closing device. The self- 
closing door assembly shall ineet the requirements of 
Section 505.1.1. The door assembly shall be installed 
with a threshold and bottom door seal and shall 
meet the requirements of Section 505.1.2. All 
combustion air for such installations shall be 
obtained from the outdoors in accordance with 
Section 507.4. The closet shall be for the exclusive 
use of the water heater. 

(2) Water heater shall be of the direct vent type. 
[NFPA 54: 10.28.1.2] 

505.1.1 Self-Closing Doors. Self-closing doors 
shall swing easily and freely and shall be 
equipped with a self-closing device to cause the 
door to close and latch each time it is opened. 
The closing mechanism shall not have a hold- 
open featiire. [NFPA 80: 6.1.4.2] 



505.1.2 Gasketing. Gasketing on gasketed doors 
or frames shall be furnished only in accordance 
with the published listings of the doors, frame, 
or gasketing material manufacturer. [NFPA 80: 
6.4.8] 

Exception: Where acceptable to the Authority 
Having Jurisdiction, gasketing of noncombustible 
or limited-combustible material (see NFPA 220) 
Standard on Types of Building Construction) 
shall be permitted to be applied to the frame, 
provided closing and latching of the door are not 
inhibited. 

505.2 Water heaters of other than the direct-vent 
type shall be located as close as practical to the 
chimriey oi: gas vent. [NFPA 54: 9.28.1.2] 

505.3 Clearance. 

505.3.1 The clearances shall not be such as to 
interfere with combustion air, draft hood clearance 
and relief, and accessibility for servicing. Listed 
water heaters shall be installed in accordance with 
their listings and the manufacturers' instructions. 
[NFPA 54: 10.28.2.1] 

505.3.2 Unlisted water heaters shall be installed 
with a clearance of 12 inches (300 mm) on all sides 
and rear. Combustible floors under unlisted 
water heaters shall be protected in an approved 
manner. [NFPA 54: 10.28.2.2] 

505.4 Pressure-Limiting Devices. A water heater 
installation shall be provided with overpressure 
protection by means of an approved, listed device, 
installed in accordance with the terms of its listing and 
the manufacturer's instructions. [NFPA 54: 10.28.3] 

505.5 Temperature-Limiting Devices. A water 
heater installation or a hot water storage vessel 
installation shall be provided with overtemperature 
protection by means of an approved, listed device 
installed in accordance with the terms of its listing and 
the manufacturer's instructions. [NFPA 54: 10.28.4] 

505.6 Temperature, Pressure, and Vacuum Relief 
Devices. The installation of temperature, pressure, 
and vacuum relief devices or combinations thereof, 
and automatic gas shutoff devices, shall be installed 
in accordance with the terms of their listings and the 
manufacturers' instructions. A shutoff valve shall not 
be placed between the relief valve and the water 
heater or on discharge pipes between such valves 
and the atmosphere. The hourly Btu discharge 
capacity or the rated steam relief capacity of the 
device shall not be less than the input rating of the 
water heater. [NFPA 54: 10.28.5] 

506.0 Oil-Burning and Other Water Heaters. 

506.1 Water heaters deriving heat from fuels or types 
of energy other than gas shall be constructed and 



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40 



WATER HEATERS 



506.1-507.1 



in accordance with approved standards. Vents or 
chimneys for such appliances shall be approved 
types. An adequate supply of air for combustion and 
for adequate ventilation of heater rooms or 
I compartments shall be provided. Each such appliance 
shall be installed in a location approved by the 
Authority Having Jurisdiction and local and state 
fire-prevention agencies. 

506.2 All storage-type water heaters and hot water 
boilers deriving heat from fuels or types of energy 
other than gas, shall be provided with, in addition to 
the primary temperature controls, an overtemperature 
safety protection device constructed, listed, and 
installed in accordance with nationally recognized 
applicable standards for such devices and a 
combination temperature and pressure-relief valve. 

506.3 Oil-fired water heaters shall be installed in 
accordance with NFPA 31, Standard for the Installation 
of Oil-Burning Equipment. 

506.4 indirect-Fired Water l-leaters 

506.4.1 Indirect-fired water heaters shall 
conform to applicable sections of the ASME 
Boiler and Pressure Vessel Code, or to one of the 
other applicable standards shown in Table 14-1. 
Each water heater shall bear a label in 
accordance with ASME requirements, or an 
approved testing agency, certifying and attesting 
that such equipment has been tested and 
inspected and meets the requirements of the 
applicable standards or code. 

506.4.2 Indirect-fired water heater that incor- 
porate a single-wall heat exchanger shall meet 
all of the following requirements: 

(1) Connected to a low-pressure hot water 
boiler limited to a maximum of 30 psig by an 
approved safety or relief valve. 

(2) Heater transfer medium is either potable 
water or contains fluids having a toxicity rating 
or Class of 1. 

(3) Bear a label with the word "Caution," 
followed by the following statements: 

(a) The heat-transfer medium must be water 
or other nontoxic fluid having a toxic rating 
or Class of 1 as listed in Clinical Toxicology 
of Commercial Products, 5th edition. 

(b) The pressure of the heat-transfer 
medium must be limited to a maximum of 
30 psig by an approved safety or relief 
valve. 

Note: The word "Caution" and the statements 
in letters having a minimum uppercase 
height of 0.120 inch (3.05 mm). The 
minimum vertical spacing between lines of 
type shall be 0.046 inch (1.17 mm). 
Lowercase letters shall be compatible with 
the uppercase letter size specification. 



507.0 Air for Combustion and Ventilation. 

507.1 General. 

507.1.1 Air for combustion, ventilation, and 
dilution of flue gases for gas utilization equipment 
installed in buildings shall be obtained by 
application of one of the methods covered in 
Sections 507.2.1 through 507.7. Gas utilization 
equipment of other than natural draft and 
Category I vented appliances shall be provided 
with combustion, ventilation, and dilution air in 
accordance with the equipment manufacturer's 
instructions. Where infiltration does not provide the 
necessary air, outdoor air shall be introduced in 
accordance with methods covered in Sections 507.4 
through 507.7. [NFPA 54: 8.3.1.1] 

Exception No. 1: This provision shall not 
apply to direct-vent appliances. [NFPA 54: 
8.3.1.1] 

Exception No. 2: Type 1 clothes dryers that 
are provided with make-up air in 
accordance with section NFPA 54: 8.4.3. 

507.1.1.1 Clothes Dryer. A device used to 
dry wet laundry by means of heat derived 
from the combustion of fuel gases. [NFPA 
54: 3.3.18] 

507.1.1.2 Clothes Dryer, Type 1. Primarily 
used in family living environment. May 
or may not be coin-operated for public use. 
[NFPA 54: 3.3.18.1] 

507.1.1.3 Exhausting to the Outdoors. 

Type 1 and Type 2 clothes dryers shall be 
exhausted to the outside air. [NFPA 54: 10.4.2] 

507.1.1.4 Provisions for Make-Up Air. 

Make-up air shall be provided for Type 1 
clothes dryers in accordance with the 
manufacturers' installation instructions. 
[NFPA 54: 10.4.3.1] 

507.1.2 Gas appliances of other than natural 
draft design and other than Category I vented 
appliances shall be provided with combustion, 
ventilation, and dilution air in accordance with 
the appliance manufacturer's instructions. 
[NFPA 54: 9.3.1.2] 

507.1 .3 Where used, a draft hood or a barometric 
draft regulator shall be installed in the same 
room or enclosure as the equipment served so as 
to prevent any difference in pressure between the 
hood or regulator and the combustion air supply. 
[NFPA 54: 9.3.1.4] 

507.1.4 Makeup air requirements for the 
operation of exhaust fans, kitchen ventilation 
systems, clothes dryers, and fireplaces shall be 
considered in determining the adequacy of a 
space to provide combustion air requirements. 
[NFPA 54: 9.3.1.5] 



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41 



507.2 - 507.4 



UNIFORM PLUMBING CODE 



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507.2 Sndoor Combustion Air. The required 
volume of indoor air shall be determined in 
accordance with Sections 507.2.1 or 507.2.2 except 
that where the air infiltration rate is known to be less 
than 0.40 ACH, Section 507.2.2 shall be used. The 
total required volume shall be the sum of the 
required volume calculated for all appliances located 
within the space. Rooms communicating directly 
with the space in which the appliances are installed 
through openings not furnished with doors, and 
through combustion air openings sized and located 
in accordance with Section 507.3 are considered a 
part of the required volume. [NFPA 54: 9.3.2] 

507.2.1 Standard Method. The minimum 
required volume shall be 50 cubic feet per 1,000 
Btu/hour (4.8 mVkW). [NFPA 54: 9.3.2.1] 

507.2.2 Known Air Infiltration Rate Method. 

Where the air infiltration rate of a structure is 
known, the minimum required volume shall be 
determined as follows [NFPA 54: 9.3.2.2]: 

(1) For appliances having other than fan-assisted, 
comibustion systems: calculate using Equation 
5-1 but no smaller than 35 cubic feet per 1,000 
Btu/hour (3.4 mVkW). [NFPA 54: 9.3.2.2(1)] 

(2) For fan-assisted combustion system appliances, 
calculate using Equation 5-2 but no smaller 
than 25 cubic feet per 1,000 Bhi/hour (2.4 mVkW). 

[NFPA 54: 9.3.2.2(2)] 

Equation 5-1: 

Required Volume (,f;;e^ > (21ff /ACH)x ( I^^/jg^/l^OOO Btu/h) 

Equation 5-2: 

Required Volume ya„ > ( 15 ftVACH) x ( y^^/ 1,000 Btu/h) 

Where: 

Igther ~ ^^^ Appliances other than Fan-Assisted 
Input in Btu/hour 

Fan-Assisted Appliance Input in Btu/hour 
Air Change per Hour (Percent of volume of 
space exchanged per hour, expressed as a 
decimal) 

Indoor Opening Size and Location. 
Openings used to connect indoor spaces shall be 
sized and located in accordance with the following 
[NFPA 54: 9.3.2.3]: 

(1) Combining spaces on the same story. Each 
opening shall have a minimum free area of 
1 in.V 1,000 Btu/h (2200 mmVkW) of the 
total input rating of all gas utilization 
equipment in the space, but not less than 
100 in.' (0.06 m'). One opening shall 
commence within 12 inches (300 mm) of the 
top, and one opening shall commence 
within 12 inches (300 mm) of the bottom of 



'■fan ~ 
ACH 



507.3 



the enclosure [see Figure 5-7]. The 
minimum dimension of air openings shall 
be not less than 3 inches (80mm). [NFPA 
54:9.3.2.3(1)] 

(2) Combining spaces in different stories. The 
volumes of spaces in different stories shall be 
considered as conrniunicating spaces where 
such spaces are connected by one or miore 
openings in doors or floors having a total 
minimum free area of 2 in. V 1/000 Btu/h 
(4,400 mmVkW) of total input rating of all 
gas utilization equipment. [NFPA 54: 8.3.2.3(2)] 

507.4 Outdoor Combustion Air. Outdoor combustion 
air shall be provided through opening(s) to the 
outdoors in accordance with methods in Sections 
507.4.1 or 507.4.2. The minimum dimension of air 
openings shall not be less than 3 inches (80 mm). [NFPA 
54:9.3.3] 

507.4.1 Two Permanent Openings Method: 

Two permanent openings, one commencing 
within 12 inches (300 mm) of the top and one 
commencing within 12 inches (300 rmn) of the 
bottom of the enclosure shall be provided. The 
openings shall communicate directly, or by 
ducts, with the outdoors or spaces that freely 
communicate with the outdoors as follows. [See 
Figure 5-8 through 5-11.] [NFPA 54: 9.3.3.1] 

(1) Where directly communicating with the 
outdoors or where contmunicating to the 
outdoors through vertical ducts, each 
opening shall have a minimum free area of 1 
in.V4000 Btu/h (550 mmVkW) of total input 
rating of all equipment in the enclosure. [See 
Figures 5-8 and 5-9.] [NFPA 54: 9.3.3.1(1)] 

(2) Where communicating with the outdoors 
through horizontal ducts, each opening shall 
have a minimum free area of 1 in.V2,000 
Btu/h (1,100 mmVkW) of total input rating 
of all equipment in the enclosure. [See 
Figure 5-10] [NFPA 54: 9.3.3.1(2)] 

507.4.2 One Permanent Opening Method: 

One permanent opening, commencing within 12 
inches (300 mm) of the top of the enclosure, shall 
be provided. The equipment shall have clearances 
of at least 1 inch (25 mm) from the sides and back 
and 6 inches (160 mm) from the front of the 
appliance. The opening shall directly 
communicate with the outdoors or shall 
communicate through a vertical or horizontal 
duct to the outdoors or spaces that freely 
communicate with the outdoors [see 
Figure 5-11] and shall have a minimum free area of 
the foUowing [NFPA 54: 9.3.3.2] : 

(1) 1 in.V3000 Btu/h (700 mmVkW) of the 
total input rating of all equipment located in 
the enclosure, and [NFPA 54: 9.3.3.2(1)] 

(2) Not less than the sum of the areas of all vent 
connectors in the space. [NFPA 54: 9.3.3.2(2)] 



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42 



WATER HEATERS 



507.5 - 507.9 



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507.5 Combination Indoor and Outdoor Com- 
bustion Air. The use of a combination of indoor and 
outdoor combustion air shall be in accordance with 
Sections 507.5.1, 507.5.2 and 507.5.3 [see example 
calculation in NFPA 54 Annex J and this chapter - 
Part II] [NFPA 54: 9.3.4]. 

507.5.1 Indoor Openings. Where used, 
openings connecting the interior spaces shall 
comply with Section 507.3. [NFPA 54: 9.3.4(1)] 

507.5.2 Outdoor openings shall be located in 
accordance with Sections 507.4.1 or 507.4.2. 
[NFPA 54: 9.3.4(2)] 

507.5.3 Outdoor Openings Size. The outdoor 
openings size shall be calculated in accordance 
with the following [NFPA 54: 9.3.4(3)]: 

(1) The ratio of interior spaces shall be the 
available volume of all communicating spaces 
divided by tlie required vokime. 

(2) The outdoor size reduction factor shall be 1 
minus the ratio of interior spaces. 

(3) The minimum size of outdoor openings 
shall be the full size of outdoor openings 
calculated in accordance with Sections 
507.4.1 or 507.4.2, multiplied by the 
reduction factor. The minimum dimension 
of air openings shall not be less than 3 inches 
(80 mm). [NFPA 54: 8.3.4(3)(c)] 

507.6 Engineered Installations. Engineered 
combustion air installations shall provide an 
adequate supply of combustion, ventilation, and 
dilution air and shall be approved by the Authority 
Having Jurisdiction. [NFPA 54: 9.3.5] 

507.7 Mechanical Combustion Air Supply. Where 
all combustion air is provided by a mechanical air 
supply system, the combustion air shall be supplied 
from outdoors at the minimum rate of 0.35 feet^/min 
per 1,000 Btu/h (0.034 mVmin per kW) for all 
appliances located within the space. [NFPA 54: 9.3.6] 

507.7.1 Where exhaust fans are installed, 
additional air shall be provided to replace the 
exhausted air. [NFPA 54: 9.3.6.1] 

507.7.2 Each of the appliances served shall be 
interlocked to the mechanical air supply 
system to prevent main burner operation 
where the mechanical air supply system is not 
in operation. [NFPA 54: 9.3.6.2] 

507.7.3 Where combustion air is provided by 
the building's mechanical ventilation system, the 
system shall provide the specified combustion 
air rate in addition to the required ventilation 
air. [NFPA 54: 9.3.6.3] 

507.8 Louvers Grilles and Screens. 

(A) Louvers and Grilles. The required size of 
openings for combustion, ventilation,and 



dilution air shall be based on the net free area 
of each opening. Where tlie free area through 
a design of louver or grille is known, it shall 
be used in calculating the size opening 
required to provide the free area specified. 
Where the design and free area are not 
known, it shall be assumed that wood louvers 
will have 25 percent free area and metal 
louvers and grilles will have 75 percent free 
area. Nonmotorized louvers and grilles 
shall be fixed in the open position. [NFPA 
54: 9.3.7.1] 

(B) Screens. Screens shall not be smaller than 
1/4-inch mesh. [NFPA 54: 9.3.7.2] 

(C) Motorized louvers shall be interlocked with 
the equipment so they are proven in tlie full 
open position prior to maui burner ignition 
and during main burner operation. Means 
shall be provided to prevent the main burner 
from igniting should the louver fail to open 
during burner start-up and to shut down the 
main burner if the louvers close during 
burner operation. [NFPA 54: 9.3.7.3] 

507.9 Combustion Air Ducts. Combustion air ducts 
shall comply with the following: 

(1) Ducts shall be of galvanized steel or a 
material having equivalent corrosion resis- 
tance, strength, and rigidity. [NFPA 54: 9.3.8.1] 

Exception: Within dwelling units, un- 
obstructed stud and joist spaces shall not be 
prohibited from conveying combustion air, 
provided that not more than one fireblock is 
removed. 

(2) Ducts shall terminate in an unobstructed 
space, allowing free movement of combustion 
air to the appliances. [NFPA 54: 9.3.8.2] 

(3) Ducts shall serve a single space. 
[NFPA 54: 9.3.8.3] 

(4) Ducts shall not service both upper and 
lower combustion air openings where both 
such openings are used. The separation 
between ducts serving upper and lower 
combustion air openings shall be maintained 
to the source of combustion air. [NFPA 54: 9.3.8.4] 

(5) Ducts shall not be screened where termi- 
nating in an attic space. [NFPA 54:9.3.8.5] 

(6) Intakes for combustion air ducts located 
exterior to the building shall have tlie lowest 
side of the combustion air intake openings 
located at least 12 inches (300 mm) vertically 
from the adjoining grade level. 

(7) Horizontal upper combustion air ducts shall 
not slope downward toward the source of 
combustion air. [NFPA 54: 9.3.8.6] 



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43 



507.9-508.11 



UNIFORM PLUMBING CODE 



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(8) The remaining space surrounding a chimney 
liner, gas vent, special gas vent, or plastic 
piping installed within a masomy chimney 
flue, metal or factory-built chimney, shall not 
be used to supply combustion air [NFPA 54: 
9.3.8.7], unless it is listed and shown in the 
manufacturer's installation instructions. 

508.0 Other Water Heater Installation Requirements. 

508.1 The Authority Having Jurisdiction shall have the 
authority to require the use of an approved dielectric 
insulator on the water piping connections of water 
heaters and related water heating equipment. 

508.2 In seismic design categories C, D, E, and F, 
water heaters shall be anchored or strapped to resist 
horizontal displacement due to earthquake motion. 
Strapping shall be at points within the upper one- 
third (1/3) and lower one-third (1/3) of its vertical 
dimensions. At the lower point, a minimum distance 
of four (4) inches (102 mm) shall be maintained 
above the controls with the strapping. 

508.3 A water heater supported from the ground 
shall rest on level concrete or other approved base 
extending not less than three (3) inches (76 mm) 
above the adjoining ground level. 

508.4 When a water heater is located in an attic, attic- 
ceiling assembly, floor-ceiling assembly, or floor- 
subfloor assembly where damage may result from a 
leaking water heater, a watertight pan of corrosion- 
resistant materials shall be installed beneath the 
water heater with a minimum three-quarter (3/4) 
inch (20 mm) diameter drain to an approved location. 

508.5 Relief Valve Discharge. 

Discharge from a relief valve into a water heater pan 
shall be prohibited. 

508.6 Added or Converted Equipment. When addi- 
tional or replacement equipment is installed or an 
appliance is converted to gas from another fuel, the 
location in which the equipment is to be operated shall 
be checked to verify the following [NFPA 54: 9.1.2]: 

508.6.1 Air for combustion and ventilation is 
provided where required, in accordance with the 
provisions of Section 507.0. Where existing 
facilities are not adequate, they shall be 
upgraded to Section 507.0 specifications [NFPA 
54: 9.1.2(1)]. 

508.6.2 The installation components and equip- 
ment meet the clearances to combustible material 
provisions of NFPA 54: 9.2.2. It shall be deter- 
mined that the installation and operation of 
the additional or replacement equipment does 
not render the remaining equipment unsafe for 
continued operation. [NFPA 54: 9.1.2(2)] 



(The following reference was extracted from NFPA 54.) 

9.2.2 Clearance to Combustible Materials. Gas 
utilization equipment and their vent connectors shall be 
installed with clearances from combustible material so 
their operation will not create a hazard to persons or 
property. Minimum clearances between combustible 
walls and the back and sides of various conventional 
types of equipment and their vent connectors are 
specified in Chapters 9 and 10. (Reference can also be 
made to NFPA 211, Standard for Chimneys, Fireplaces, 
Vents, and Solid Fuel-Burning Appliances.) 

508.6.3 The venting system is constructed and 
sized in accordance with the provisions of this 
chapter. Where the existing venting system is 
not adequate, it shall be upgraded to comply 
with this chapter. [NFPA 54: 9.1.2(3)] 

508.7 Types of Gases. It shall be determined 
whether the gas-utilization equipment has been 
designed for use with the gas to which it will be 
connected. No attempt shall be made to convert the 
equipment from the gas specified on the rating plate 
for use with a different gas without consulting the 
installation instructions, the serving gas supplier, or 
the equipment manufacturer for complete 
instiructions. [NFPA 54: 9.1.3] 

508.8 Safety Shutoff Devices for Unlisted LP-Gas 
Equipment Used Indoors. Unlisted gas utilization 
equipment for use with undiluted liquefied 
petroleum gases and installed indoors shall be 
equipped with safety shutoff devices of the complete 
shutoff type. [NFPA 54: 9.1.4] 

508.9 Use of Air or Oxygen Under Pressure. Where 
air or oxygen under pressure is used in connection with 
the gas supply, effective means such as a back-pressure 
regulator and relief valve shall be provided to prevent 
air or oxygen from passing back into the gas piping. 
Where oxygen is used, installation shall be in accordance 
witii NFPA 51, Standard for the Design and Installation of 
Oxygen-Fuel Gas Systems for Welding, Cutting, and Allied 
Processes. [NFPA 54: 9.1.5] 

508.10 Protection of Gas Equipment from Fumes 
or Gases Other than Products of Combustion. 

Non-direct vent-type gas appliances installed in 
beauty shops, barbershops, or other facilities where 
chemicals that generate corrosive or flammable 
products such as aerosol sprays are routinely used 
shall be located in an equipment room separate or 
partitioned off from other areas with provisions for 
combustion and dilution air from outdoors. Direct 
vent equipment shall be installed in accordance with 
the appliance manufacturer's installation instructions. 
[NFPA 54: 9.1.6.2] 

508.11 Process Air. In addition to air needed for 
combustion in commercial or industrial processes, 
process air shall be provided as required for cooling 



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44 



WATER HEATERS 



508.11 -508.20 



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of equipment or material, controlling dew point, 
heating, drying, oxidation, dilution, safety exhaust, 
odor control, air for compressors, and for comfort 
and proper working conditions for personnel. 
[NFPA 54: 9.1.7] 

508.12 Building Structural Members. 

508.12.1 Structural members of a building shall 
not pass through gas utilization equipment 
having an operating temperature in excess of 
500°F (260°C). [NFPA 54: 9.1.8.1] 

508.12.2 Structural members passing through 
gas utilization equipment having an operating 
temperature of 500°F (260°C) or less shall be of 
noncombustible material. Building columns, 
girders, beams, or trusses shall not be installed 
within equipment, unless insulation and 
ventilation are provided to avoid all 
deterioration in strength and linear expansion of 
the building structure in either a vertical or a 
horizontal direction. [NFPA 54: 9.1.8.2] 

508.12.3 Gas utilization equipment shall be 
furnished either with load-distributing bases or 
with a sufficient number of supports to prevent 
damage to either the building structure or 
equipment. [NFPA 54: 9.1.8.3] 

508.12.4 At the locations selected for installation 
of gas utilization equipment, the dynamic and 
static load-carrying capacities of the building 
structure shall be checked to determine whether 
they are adequate to carry the additional loads. 
The equipment shall be supported and shall be 
connected to the piping so as not to exert undue 
stress on the connections. [NFPA 54: 9.1.8.4] 

508.13 Flammable Vapors. Gas appliances shall 
not be installed in areas where the open use, 
handling, or dispensing of flammable liquids 
occurs, unless the design, operation, or installation 
reduces the potential of ignition of the flammable 
vapors. Gas utilization equipment installed in 
compliance with Sections 508.14, 508.15, or 508.16 
shall be considered to comply with the intent of this 
provision. [NFPA 54: 9.1.9] 

508.14 Installation in Residential Garages. 

(1) Gas utilization equipment in residential 
garages and in adjacent spaces that open to 
the garage and are not part of the living 
space of a dwelling unit shall be installed so 
that all burners and burner-ignition devices 
are located not less than 18 inches (450 rmn) 
above the floor unless listed as flammable 
vapor ignition resistant. [NFPA 54: 9.1.10.1] 

(2) Such equipment shall be located or 
protected so it is not subject to physical damage 
by a moving vehicle. [NFPA 54: 9.1.10.2] 

(3) When appliances are installed in a separate, 
enclosed space having access only from 
outside of the garage, such equipment may 



be installed at floor level, providing the 
required combustion air is taken from the 
exterior of the garage. [NFPA 54: 9.1.10.3] 

508.15 Installation in Commercial Garages. 

508.15.1 Parking Structures. Gas utilization 
equipment installed in enclosed, basement, and 
underground parking structures shall be 
installed in accordance with NFPA 88A, Standard 
for Parking Structures. [NFPA 54: 9.1.11.1] 

508.15.2 Repair Garages. Gas utilization 
equipment installed in repair garages shall be 
installed in a detached building or room, 
separated iiom repair areas by waUs or partitions, 
floors, or floor-ceiling asseimblies that are 
constructed so as to prohibit the transmission of 
vapors and having a fire-resistance rating of not 
less than 1 hour, and that have no openings in the 
wall separating the repair area within 8 feet (2.5 m) 
of the floor. Wall penetrations shall be fire- 
stopped. Air for combustion purposes shall be 
obtained from outside the building. The heating 
room shall not be used for the storage of com- 
bustible materials. [NFPA 54: 9.1.11.2] 

Exception No. 1: Overhead heaters where 
installed not less than 8 ft (2.5 m) above the 
floor shall be permitted. 

Exception No. 2: Heating equipment for 
vehicle repair areas where there is no 
dispensing or transferring of Class I or Class 
IT flammable or combustible liquids or 
liquefied petroleum gas shall be installed in 
accordance with NFPA 30 A, Automotive and 
Marine Service Station Code. 
[NFPA 54: 8.1.11.2] 

508.16 Installation in Aircraft Hangars. Heaters 
in aircraft hangars shall be installed in accordance 
with NFPA 409, Standard on Aircraft Hangars. 
[NFPA 54: 9.1.12] 

508.17 Gas Equipment Physical Protection. 

Where it is necessary to locate gas utilization 
equipment close to a passageway traveled by vehicles 
or equipment, guardrails or bumper plates shall be 
installed to protect the equipment from damage. 
[NFPA 54: 9.1.13] 

508.18 Venting of Flue Gases.. Gas utiHzation 
equipment shall be vented in accordance with the 
provisions of this chapter and NFPA 54, Chapter 10. 
[NFPA 54: 9.1.14] 

508.19 Extra Device or Attachment. No device or 
attachment shall be installed on any gas utilization 
equipment that could in any way impair the 
combustion of gas. [NFPA 54: 9.1.15] 

508.20 Adequate Capacity of Piping. When 
additional gas utilization equipment is being 
connected to a gas piping system, the existing 



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45 



508.20 - 508.27 



UNIFORM PLUMBING CODE 



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piping shall be checked to determine if it has 
adequate capacity. (See Section 1209.4.3.) Where 
inadequate, the existing system shall be enlarged as 
necessary, or separate gas piping of adequate 
capacity shall be run from the point of delivery to 
the equipment. [NFPA 54: 9.1.16] 

508.21 Avoiding Strain on Gas Piping. Gas 

utilization equipment shall be supported and so 
connected to the piping as not to exert undue strain 
on the cormections. [NFPA 54: 9.1.17] 

508.22 Gas Appliance Pressure Regulators. 

Where the gas supply pressure is higher than that at 
which the gas utilization equipment is designed to 
operate or varies beyond the design pressure limits 
of the equipment, a gas appliance pressure regulator 
shall be installed. [NFPA 54: 9.1.18] 

508.23 Venting of Gas Appliance Pressure 
Regulators. Venting of gas appliance pressure 
regulators shall comply with the following 
requirements [NFPA 54: 9.1.19]: 

508.23.1 Gas appliance pressure regulators 
requiring access to the atmosphere for successful 
operation shall be equipped with vent piping 
leading outdoors or, if the regulator vent is an 
integral part of the equipment, into the 
con\bustion chamber adjacent to a continuous 
pilot, unless constructed or equipped with a vent 
limiting means to limit the escape of gas from the 
vent opening in the event of diaphragm failure. 
[NFPA 54: 9.1.19(1)] 

508.23.2 Vent limiting means shall be employed 
on listed gas appliance pressure regulators only. 
[NFPA 54: 9.1.19(2)] 

508.23.3 In the case of vents leading outdoors, 
means shall be employed to prevent water from 
entering this piping and also to prevent blockage 
of vents by insects and foreign matter. 

[NFPA 54: 9.1.19(3)] 

508.23.4 Under no circumstances shall a 
regulator be vented to the gas utilization equip- 
ment flue or exhaust system. [NFPA 54: 9.1.19(4)] 

508.23.5 In the case of vents entering the 
combustion chamber, the vent shall be located so 
the escaping gas will be readily ignited by the 
pilot and the heat liberated thereby will not 
adversely affect the normal operation of the 
safety shutoff system. The terminus of the vent 
shall be securely held in a fixed position relative to 
the pUot. For manufactured gas, tiie need for a flame 
arrester in the vent piping shall be determined. 
[NFPA 54: 9.1.19(5)] 

508.23.6 Vent lines from a gas appliance 
pressure regulator and bleed lines from a 
diaphragm-type valve shall not be connected to a 
common manifold terniinating in a combustion 
chamber. Vent lines shall not terminate in 



positive-pressure-type combustion chambers. 
[NFPA 54: 9.1.19(6)] 

508.24 Bleed Lines for Diaphragm-Type Valves. 

Bleed lines shall comply with the following 
requirements [NFPA 54: 9.1.20]: 

508.24.1 Diaphragm-type valves shall be 
equipped to convey bleed gas to the outside 
atmosphere or into the combustion chamber 
adjacent to a continuous pilot. [NFPA 54: 9.1.20(1)] 

508.24.2 In the case of bleed lines leading 
outdoors, means shall be employed to prevent 
water from entering this piping and also to prevent 
blockage of vents by insects and foreign matter. 
[NFPA 54: 9.1.20(2)] 

508.24.3 Bleed lines shall not terminate in the 
gas utilization equipment flue or exhaust 
system. [NFPA 54: 9.1.20(3)] 

508.24.4 In the case of bleed lines entering the 
combustion chamber, the bleed line shall be 
located so the bleed gas will be readily ignited by 
the pilot and the heat liberated thereby will not 
adversely affect the normal operation of the 
safety shutoff system. The terminus of the bleed 
line shall be securely held in a fixed position 
relative to the pilot. For nianufactured gas, the 
need for a flame arrester in the bleed line piping 
shall be determined. [NFPA 54: 9.1.20(4)] 

508.24.5 Bleed lines from a diaphragm-type 
valve and vent lines from a gas appliance 
pressure regulator shall not be connected to a 
common manifold terminating in a combustion 
chamber. Bleed lines shall not terminate in 
positive-pressure-type combustion chambers. 
[NFPA 54: 9.1.20(5)] 

508.25 Combination of Equipment. Any com- 
bination of gas utilization equipment, attachments, 
or devices used together in any manner shall comply 
with the standards that apply to the individual 
equipment. [NFPA 54: 9.1.21] 

508.26 Installation Instructions. The installing 
agency shall conform with the equipment 
manufacturer's recommendations in completing an 
installation. The installing agency shall leave the 
manufacturer's installation, operating, and 
maintenance instructions in a location on the 
premises where they will be readily available for 
reference and guidance for the Authority Having 
Jurisdiction, service personnel, and the owner or 
operator. [NFPA 54: 9.1.22] 

508.27 Protection of Outdoor Equipment. Gas 

utilization equipment not listed for outdoor 
installation but installed outdoors shall be provided 
with protection to the degree that the environment 
requires. Equipment listed for outdoor installation 



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46 



WATER HEATERS 



508.27 - 509.4 



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shall be permitted to be installed without protection 
in accordance with the provisions of its listing. (See 
9.2.1.) [NFPA 54: 9.1.23] 

(The following references were extracted from NFPA 54.) 

9.2 Accessibility and Clearance. 

9.2.1 Accessibility for Service. All gas utilization 
equipment shall be located with respect to building 
construction and other equipment so as to permit 
access to the gas utilization equipment. Sufficient 
clearance shall be maintained to permit clean- 
ing of heating surfaces; the replacement of filters, 
blowers, motors, burners, controls, and vent 
connections; the lubrication of moving parts where 
necessary; the adjustment and cleaning of burners 
and pilots; and the proper functioning of explosion 
vents, if provided. Tor attic installation, the passage- 
way and servicing area adjacent to the equipment 
shall be floored. 

509.0 Equipment on Roofs. 

509.1 General. 

(1) Gas-utilization equipment on roofs shall be 
designed or enclosed so as to withstand 
climactic conditions in the area in which they 
are installed. Where enclosures are provided, 
each enclosure shall permit easy entry and 
movement, shall be of reasonable height, and 
shall have at least a 30-inches (760mm) 
clearance between the entire service access 
panel(s) of the equipment and the wall of 
the enclosure. [NFPA 54: 9.4.1.1] 

(2) Roofs on which equipment is to be installed 
shall be capable of supporting the additional 
load or shall be reinforced to support the 
additional load. [NFPA 54: 9.4.1.2] 

(3) All access locks, screws, and bolts shall be of 
corrosion-resistant material. [NFPA 54: 9.4.1.3] 

509.2 Installation of Equipment on Roofs. 

(1) Gas utilization equipment shall be installed in 
accordance with its listing and the 
manufacturer's installation instructions. 
[NFPA 54: 9.4.2.1] 

(2) Equipment shall be installed on a well- 
drained surface of the roof. At least 6 feet 
(1.8m) of clearance shall be available 
between any part of the equipment and the 
edge of a roof or similar hazard, or rigidly 
fixed rails, guards, parapets, or other 
building structures at least 42 inches (1.1 m) 
in height shall be provided on the exposed 
side. [NFPA 54: 9.4.2.2] 

(3) All equipment requiring an external source of 
electrical power for its operation shall be 
provided with (1) a readily accessible 



electrical disconnecting means within sight 
of the equipment that will completely 
de-energize the equipment, and (2) a 120-V 
ac grounding-type receptacle outlet on the 
roof adjacent to the equipment. The 
receptacle outlet shall be on tlie supply side 
of the disconnect switch. [NFPA 54: 9.4.2.3] 

(4) Where water stands on the roof at the 
equipment or in the passageways to the 
equipment, or where the roof is of a design 
having a water seal, a suitable platform, 
walkway, or both shall be provided above the 
waterltne. Such platforms or walkways shall 
be located adjacent to the equipment and 
control panels so that the equipment can 
be safely serviced where water stands on the 
roof. [NFPA 54: 9.4.2.4] 

509.3 Access to Equipment on Roofs. 

509.3.1 Gas utilization equipment located on 
roofs or other elevated locatior\s shall be accessible. 
[NFPA 54: 9.4.3.1] 

509.3.2 Buildings more than 15 feet (4.6 m) in 
height shall have an inside means of access to the 
roof, unless other means acceptable to the Authority 
Having Jurisdiction are used. [NFPA 54: 9.4.3.2] 

509.3.3 The inside means of access shall be a 
permanent, or fold-away inside stairway or 
ladder, terminating in an enclosure, scuttle, or 
trap door. Such scuttles or trap doors shall be at 
least 22 inches x 24 inches (560 mm x 610 mm) in 
size, shall open easily and safely under all 
conditions, especially snow; and shall be 
constructed so as to permit access from the roof 
side unless deliberately locked on the inside. 

At least 6 feet (1.8 m) of clearance shaU be avail- 
able between the access opening and the edge of 
the roof or similar hazard, or rigidly fixed rails 
or guards a minimum of 42 inches (1.1 m) in height 
shall be provided on the exposed side. Where 
parapets or other building structures are utilized in 
lieu of guards or rails, they shall be a minimum 
of 42 inches (1.1 m) in height. [NFPA 54: 9.4.3.3] 

509.3.4 Permanent lighting shall be provided at 
the roof access. The switch for such lighting 
shall be located inside the building near the 
access means leading to the roof. [NFPA 54: 9.4.3.4] 

509.4 Appliances in Attics. 

509.4.1 Attic Access. An attic in which an 
appliance is installed shall be accessible through 
an opening and passageway at least as large as 
the largest component of the appliance, and not 
less tiian 22 inches x 30 inches (560 mm x 760 mm). 
[NFPA 54: 9.5.1] 

509.4.2 Where the height of tlie passageway is 
less than 6 feet (1.8 m), the distance from the 



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47 



509.4-510.2 



UNIFORM PLUMBING CODE 



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passageway access to the appliance shall not 
exceed 20 feet (6.1 m) measured along the 
centerline of the passageway. [NFPA 54: 9.5.1.1] 

509.4.3 The passageway shall be unobstructed 
and shall have solid flooring not less than 24 
inches (610 mm) wide from the entrance opening 
to the appliance. [NFPA 54: 9.5.1.2] 

509.4.4 Work Platform. A level working 
platform not less thair 30 inches (760 mm) by 30 
inches (760 mm) shall be provided in front of the 
service side of the appliance. [NFPA 54: 9.5.2] 

509.4.5 Lighting and Convenience Outlet. A 

permanent 120-volt receptacle outlet and a 
lighting fixture shall be installed near the 
appliance. The switch controlling the lighting 
fixture shall be located at the entrance to the 
passageway. [NFPA 54: 9.5.3] 

510.0 Venting of Equipment. 

510.1 General. This section recognizes that the 
choice of venting materials and the methods of 
installation of venting systems are dependent on the 
operating characteristics of the gas utilization 
equipment. The operating characteristics of vented 
gas utilization equipment can be categorized with 
respect to (1) positive or negative pressure within the 
venting system, and (2) whether or not the 
equipment generates flue or vent gases that can 
condense in the venting system. See NFPA 54 Section 
3.3 for the definition of these vented appliance 
categories. [NFPA 54: 12.2] 

510.2 Specification for Venting. 

510.2.1 Connection to Venting Systems. 

Except as permitted in Sections 510.2.2 through 
510.2.6, all gas utilization equipment shall be 
connected to venting systems. [NFPA 54: 12.3.1] 

510.2.2 Equipment Not Required to Be 
Vented. The following equipment shall not be 
required to be vented [NFPA 54: 12.3.2]: 

51 0.2.2.1 Listed Ranges. [NFPA 54: 12.3.2(1)] 

510.2.2.2 Built-in Domestic Cooking Units 
Listed and Marked for Optional Venting. 
[NFPA 54: 12.3.2(2)] 

510.2.2.3 Listed Hot Plates and Listed 
Laundry Stoves. [NFPA 54: 12.3.2(3)] 

510.2.2.4 Listed T)^e 1 clothes dryers shall 
be exhausted to the outside air. 

[NFPA 54: 12.3.2(4)] 

510.2.2.5 A single listed booster-type 
(automatic instantaneous) water heater, 
when designed and used solely for the 
sanitizing rinse requirements of a dish- 



washing machine, provided that the equip- 
ment is installed with the draft hood in place 
and unaltered if a draft hood is required, in 
a commercial kitchen having a mechanical 
exhaust system; where installed in this 
manner, the draft hood outlet shall not be 
less than 36 inches (910 mm) vertically and 6 
inches (150 man) horizontally from any surface 
other than the equipment. [NFPA 54: 12.3.2(5)] 

510.2.2.6 Listed Refrigerators. 
[NFPA 54: 12.3.2(6)] 

510.2.2.7 Counter Appliances. 
[NFPA 54: 12.3.2(7)] 

510.2.2.8 Direct Gas-Fired Makeup Air 
Heaters. [NFPA 54: 12.3.2(9)] 

510.2.2.9 Other Equipment Listed for 
Unvented Use and Not Provided with Flue 
Collars. [NFPA 54: 12.3.2(10)] 

510.2.2.10 Specialized Equipment of Limited 
Input such as Laboratory Burners or Gas 
Lights. [NFPA 54:12.3.2(11)] Where any or all 
of this equipment in Sections 510.2.2.1 
through 510.2.2.10 is installed so the aggregate 
input rating exceeds 20 Btu/h/ff (207 W/m^) 
of room or space in which it is installed, one 
or more shall be provided with venting 
systems or other approved means for 
removing the vent gases to the outside 
atmosphere so the aggregate input rating of 
the remaining unvented equipment does not 
exceed 20 Btu/h/ft' (207 W/m^). Where the 
calculationincludes the volume of an adjacent 
room or space, the room or space in which the 
equipment is installed shall be directly 
connected to the adjacent rooni or space by a 
doorway, archway, or other opening of 
comparable size that cannot be closed. 

510.2.3 Ventilating Hoods. Ventilating hoods 
and exhaust systems shall be permitted to be 
used to vent gas utilization equipnient installed in 
commercial applications (see Section 510.3.5) 
and to vent industrial equipment, particularly 
where the process itself requires fume disposal. 
[NFPA 54: 12.3.3] 

510.2.4 Well-Ventilated Spaces. The operation of 
industrial gas utilization equipment such that its 
flue gases are discharged directly into a large and 
well-ventilated space shall be permitted. [NFPA 
54: 12.3.4] 

510.2.5 Direct-Vent Equipment. Listed direct- 
vent gas utilization equipment shall be 
considered properly vented where installed in 
accordance with the terms of its listing, the 
manufacturer's instructions, and Section 510.8(3) 
of this code. [NFPA 54: 12.3.5] 



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48 



WATER HEATERS 



510.2-510.5 



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510.2.6 Equipment with Integral Vents. Gas 

utilization equipment incorporating integral 
venting means shall be considered properly 
vented where installed in accordance with its 
listing, the manufacturer's instructions, and 
Sections 510.8.1 and 510.8.2 of this code. [NFPA 
54: 12.3.6] 

510.3 Design and Construction. 

510.3.1 Minimum Safe Performance. A venting 
system shall be designed and constructed so as to 
develop a positive flow adequate to remove flue or 
vent gases to the outside atmosphere. 

510.3.2 Equipment Draft Requirements. A 

venting system shall satisfy the draft require- 
ments of the equipment in accordance with the 
manufacturer's instructions. [NFPA 54: 12.4.1] 

510.3.3 Design and Construction. Gas 

utilization equipment required to be vented shall 
be connected to a venting system designed and 
installed in accordance with the provisions of 
Sections 510.4 through 510.15 of this code. 
[NFPA 54: 12.4.2] 

510.3.4 Mechanical Draft Systems. 

510.3.4.1 Mechanical draft systems shall be 
listed and shall be installed in accordance 
with the terms of their listing and both the 
appliance and the mechanical draft system 
manufacturers' instructions. [NFPA 54: 12.4.3.1] 

510.3.4.2 Gas utilization equipment 
requiring venting shall be permitted to be 
vented by means of mechanical draft 
systems of either forced or induced draft 
design. [NFPA 54: 12.4.3.2] 

Exception: Incinerators. 

510.3.4.3 Forced draft systems and all 
portions of induced draft systems under 
positive pressure during operation shall be 
designed and installed so as to prevent 
leakage of flue or vent gases into a building. 
[NFPA 54: 12.4.3.3] 

51 0.3.4.4 Vent connectors serving equipment 
vented by natural draft shall not be connected 
into any portion of mechanical draft systems 
operating under positive pressure. 

[NFPA 54: 12.4.3.4] 

51 0.3.4.5 Where a mechanical draft system 
is employed, provision shall be made to 
prevent the flow of gas to the main burners 
when the draft system is not performing so as 
to satisfy the operating requirements of the 
equipment for safe performance. 

[NFPA 54: 12.4.3.5] 

510.3.4.6 The exit terminals of mechanical 
draft systems shall be not less than 7 feet (2.1 m) 



above grade where located adjacent to public 
walkways and shall be located as specified in 
Sections 510.8.1 and 510.8.2 of this code. 
[NFPA 54: 12.4.3.6] 

510.3.5 Ventilating Hoods and Exhaust 
Systems. 

510.3.5.1 Ventilating hoods and exhaust 
systems shall be permitted to be used to vent 
gas utilization equipment installed in 
commercial applications. [NFPA 54: 12.4.4.1] 

510.3.5.2 Where automaticciUy operated gas 
utilization equipment is vented through a 
ventilating hood or exhaust system equipped 
with a damper or with a power means of 
exhaust, provisions shall be made to allow 
the flow of gas to the main burners only 
when the damper is open to a position to 
properly vent the equipment and when the 
power means of exhaust is in operation. 
[NFPA 54: 12.4.4.2] 

510.3.6 Circulating Air Ducts and Furnace 
Plenums. No portion of a venting system shall 
extend into or pass through any circulating air 
duct or furnace plenum. [NFPA 54: 12.4.5.1] 

510.4 Type of Venting System to Be Used. 

51 0.4.1 The type of venting system to be used shall 
be in accordance with Table 5-2. [NFPA 54: 12.5.1] 

510.4.2 Plastic Piping. Plastic piping used for 
venting equipment listed for use with such 
venting materials shall be approved. [NFPA54: 1252] 

510.4.3 Special Gas Vent. Special gas vent shall 
be listed and installed in accordance with the 
terms of the special gas vent listing and the 
manufacturer's instructions. [NFPA 54: 12.5.3] 

510.5 Masonry, Metal, and Factory-Built 
Chimneys. 

510.5.1 Listing or Construction. 

510.5.1.1 Factory-built chimneys shall be 
installed in accordance with their listing and 
the manufacturers' instructions. Factory-built 
chimneys used to vent appliances that 
operate at positive vent pressure shall be 
listed for such application. [NFPA 54; 12.6.1.1] 

510.5.1.2 Metal chimneys shall be built and 
installed in accordance with NFPA 211, 
Standard for Chimneys, Fireplaces, Vents, and 
Solid Fuel-Burning Appliances. [NFPA 54: 12.6.1.2] 

510.5.1.3 Masonry chimneys shall be built 
and installed in accordance with NFPA 211, 
Standard for Chimneys, Fireplaces, Vents, and 
Solid Fuel-Burning Appliances, and lined with 
approved clay flue lirung, a listed chimney 



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49 



510.5 



UNIFORM PLUMBING CODE 



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lining system, or other approved material' 
that will resist corrosion, erosion, softening, 
or cracking from vent gases at temperatures 
up to 1800°F (982°C). [NFPA 54: 12.6.1.3] 

Exception: Masonry chimney flues lined 
with a chimney lining system specifically 
listed for use with listed gas appliances 
with draft hoods. Category I appliances, 
and other gas appliances listed for use 
with T)Ape B vente shall be permitted. The 
liner shall be installed in accordance with the 
liner manufacturer's instructions and the 
terms of the listing. A permanent identifying 
label shall be attached at the point where - 
the connection is to be made to the Uner. 
The label shall read: "This chimney Uner is 
for appliances that bvim gas only. Do not 
connect to solid-or liquid-fuel-buming 
appliances or incinerators." [NFPA 54: 
12.6.1.3] 

510.5.2 Termination. 

510.5.2.1 A chimney for residential-type or 
low-heat gas utilization equipment shall 
extend at least 3 feet (0.9 m) above the 
highest point where it passes through a roof 
of a building and at least 2 feet (0.6 m) 
higher than any portion of a building within 
a horizontal distance of 10 feet (3.0 m). [See 
Figure 5-1.] [NFPA 54: 12.6.2.1] 

510.5.2.2 A chimney for medium-heat 
equipment shall extend at least 10 feet (3.0 m) 
higher than any portion of any building 
within 25 feet (7.6 m). [NFPA 54: 12.6.2.2] 

510.5.2.3 A chimney shall extend at least 5 feet 
(1.5 m) above the highest connected equip- 
ment draft hood outlet or flue collar. 
[NFPA 54: 12.6.2.3] 

51 0.5.2.4 Decorative shrouds shall i>ot be 
installed at the termination of factory-built 
chimneys except where such shrouds are 
listed and labeled for use with the specific 
factory-built chimney system and are 
installed in accordance with manufacturers' 

installation instructions. [NFPA 54: 12.6.2.4] 

510.5.3 Size of Chimneys. The effective area of 
a chimney venting system serving listed gas 
appliances with draft hoods. Category I 
appliances, and other appliances listed for use 
with Type B vents shall be in accordance with 
one of the following methods [NFPA 54: 12.6.3.1]: 

(1) This chapter and NFPA 54; Chapter 13. 
[NFPA 54: 12.6.3.1(1)] 

(2) For sizing an individual chimney venting 
system for a single appliance with a draft 
hood, the effective areas of the vent 
cormector and chimney flue shall be not less 
than the area of the appliance flue collar or 
draft hood outlet or greater than seven times 
the draft hood outlet area. [NFPA 54: 12.6.3.1(2)] 



(3) For sizing a chimney venting system connected 
to two appliances with draft hoods, the 
effective area of the chimney flue shall be 
not less than the area of the larger draft hood 
outlet plus 50 percent of the area of the 
smaller draft hood outlet, or greater than 
seven times the smallest drcift hood outlet area. 
[NFPA 54: 12.6.3.1(3)] 

(4) Other approved engineering methods. 
[NFPA 54: 12.6.3.1(5)] 

(5) Chimney venting systems using mechanical 
draft shall be sized in accordance with approved 
engineering methods. [NFPA 54: 12.6.3.1(4)] 
Where an incinerator is vented by a chimney 
serving other gas utilization equipment, the 
gas input to the incinerator shall not be 
included in calculating chimney size, provided 
the chimney flue diameter is not less than 1 
inch (25 mm) larger in equivalent diameter 
than the diameter of the incinerator flue outlet. 
[NFPA 54: 12.6.3.2] 

510.5.4 Inspection of CSiimneys. 

(A) Before replacing an existing appliance or 
connecting a vent connector to a chimney, 
the chimney passageway shall be examined 
to ascertain that it is clear and free of 
obstructions and shall be cleaned if 
previously used for venting solid- or liquid- 
fuel-burntng appliances or fireplaces. 
[NFPA 54: 12.6.4.1] 

(B) Chimneys shall be lined in accordance with 
NFPA 211, Standard for Chimneys, Fireplaces, 
Vents, and Solid-Fuel Burning Appliances. 
[NFPA 54: 12.6.4.2] 

(C) Cleanouts shall be examined to determine 
that they will remain tightly closed when 
not in use. [NFPA 54: 12.6.4.3] 

(D) When inspection reveals that an existing 
chimney is not safe for the intended 
application, it shall be repaired, rebuilt, 
lined, relined, or replaced with a vent or 
chimney to conform to NFPA 211, Standard 
for Chimneys, Fireplaces, Vents, and Solid- 
Fuel-Burning Appliances, and shall be 
suitable for the equipment to be attached. 
[NFPA 54: 12.6.4.4] 

510.5.5 Chimney Serving Equipment Burning 
Other Fuels. 

510.5.5.1 Gas utilization equipment shall 
not be comiected to a chimney flue serving a 
separate appliance designed to bum solid fuel. 
[NFPA 54: 12.6.5.1] 

510.5.5.2 Where one chimney serves gas 
utilization equipment and equipment 
burning liquid fuel, the equipment shall be 
connected through separate openings or 
shall be connected through a single opening 



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50 



WATER HEATERS 



Figure 5-1 - Table 5-2 



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2 ft (0.6 m) 
minimum - 



r-10ft(3.0m)--^ 
/ or less \ 




3 ft (0.9 m) 
minimum 



Chimney J^ 



Chimney 



10 ft (3.0 m) 
or less 




3 ft (0.9 m) 
minimum 



Chimney 



(a) Temiination 10 ft (3.0 m) or Less from Ridge, Wall, or Parapet 



More than 
• 10 ft (3.0 m)- 



Wall or 
parapet 



~-*fl. 



'^^/M<-^. 



Note: No height 
above parapet 
required when 
distance from wails 
or parapet is more 
th^ 10 ft (3.0 m). 



3 ft (0.9 m) 
minimum 



Chimney 



Height above any 
roofsurface wiflirn 
10 ft (3.0 m) horizontally 



Ridge 




Chimney 



(b) Temiination J^ore Than 10 ft (3,0 m) from Ridge, Wail, or Parapet 

FIGURE 5-1 Typical Termination Locations for 
Chimneys and Single-Wall Metal Pipes Serving 
Residential-Type and Low-Heat Equipment 
[NFPA 54: Figure 12.6.2.1] 



where joined by a suitable fitting located as 
close as practical to the chimney. Where two 
or more openings are provided into one 
chimney flue, they shall be at different 
levels. Where the gas utilization equipment 
is automatically controlled, it shall be 
equipped with a safety shutoff device. 
[NFPA 54: 12.6.5.2] 

TABLE 5-2 
Type of Venting System to Be Used 



Gas Utilization Equipment 



Type of Venting System 



Listed Category I equipment 
Listed equipment equipped 

with draft hood 
Equipment listed for use with 
Type B gas vent 
system for gas venting 



Type B gas vent (510.6) 
Chimney (510.5) 
Single-wall metal pipe 
(510.7) 
Listed chimney lining 

(510.5.1.3) 
Special gas vent listed 
for this equipment 
(510.4.3) 



Listed vented wall furnaces 



Type B-W gas vent 
(510.6, 510.6.2.2) 



Category II equipment 

Category III equipment 
Category IV equipment 



As specified or 
furnished 

By manufacturers of 

listed 

equipment (510.4.2, 

510.4.3) 



Incinerators, outdoors 



Single-wall metal pipe 
(510.7, 510.7.3) 



Incinerators, indoors 

Equipment that can be converted 
to use of solid fuel 

Unlisted combination gas- and 
oil-burning equipment 

Combination gas- and solid-fuel- 
burning equipment 

Equipment listed for use with 
chimneys only 

Unlisted equipment 



Chimney (510.5) 



Listed combination gas- and 
oil-burning equipment 


Type L vent (510.6) or 
chimney (510.5) 


Decorative appliance in 
fireplace 


vented 


Chimney [UMC 907.2(3)] 


Gas-fired toilets 




Single-wall metal pipe 
(510.7, NFPA 54: 9.25.3) 


Direct-vent equipment 




See 510.2.5 


Equipment with Integra 


vent 


See 510.2.6 



[NFPA 54: Table 12.5.1] 



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51 



Figure 5-2 -510.6 



UNIFORM PLUMBING CODE 



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Listed 
cap 



Lowe st discharge opening 



Listed gas 
vent 




Root pitch is )^^2 



H (minimum) - 
Minimum height from roof 
to lowest discharge opening 



Roof pitch heights 



Roof pitch H(minimum) ft. 


m 


Flat to 6/12 


1.0 


0.30 


Over 6/12 to 7/12 


1.25 


0.38 


Over 7/12 to 8/12 


1.5 


0.46 


Over 8/12 to 9/12 


2.0 


0.61 


Over 9/12 to 10/12 


2.5 


0.76 


Over 10/12 to 11/12 


3.25 


0.99 


Over 11/12 to 12/12 


4.0 


1.22 


Over 12/12 to 14/12 


5.0 


1.52 


Over 14/12 to 16/12 


6.0 


1.83 


Over 16/12 to 18/12 


7.0 


2.13 


Over 18/12 to 20/12 


7.5 


2.27 


Over 20/12 to 21/12 


8.0 


2.44 



FIGURE 5-2 Gas Vent Termination Locations for 
Listed Caps 12 in. (300 mm) or Less in Size at 
Least 8 ft. (2.4 m) from a Vertical Wall [NFPA 54: 
Figure 12.7.2 and Table 12.7.2] 



Vr- 



Gas furnace 




Type B gas vents 



Air grilles in 
outside walls 



Louvered door could 
be used in lieu of 
outside wall grilles 



FIGURE 5-3 Plan View of Practical Separation 
Method for Multistory Gas Venting. [NFPA 54: 
Figure 12.7.4.2] 



510.5.5.3 A listed combination gas- and 
solid-fuel-burning appliance connected to a 
single chimney flue shall be equipped w^ith a 
manual reset device to shut off gas to the 
main burner in the event of sustained 
backdraft or flue gas spillage. The chirrmey 
flue shall be sized to properly vent the 
appliance. [NFPA 54: 12.6.5.3] 

510.5.5.4 A single chimney flue serving a 
listed combination gas- and oil-burning 
appliance shall be sized to properly vent the 
appliance. [NFPA 54: 12.6.5.4] 

510.5.6 Support of Chimneys. All portions of 
chimneys shall be supported for the design and 
weight of the materials employed. Listed 
factory-built chimneys shall be supported and 
spaced in accordance with their listings and the 
manufacturers' instructions. [NFPA 54: 12.6.6] 

510.5.7 Cleanouts. Where a chimney that 
formerly carried flue products from liquid- or 
solid-fuel-burning appliances is used with an 
appliance using fuel gas, an accessible cleanout 
shall be provided. The cleanout shall have a 
tight-fitting cover and be installed so its upper 
edge is at least 6 inches (150 mm) below the 
lower edge of the lowest chimney inlet opening. 
[NFPA 54: 12.6.7] 

510.5.8 Space Surrounding Lining or Vent 

510.5.8.1 The remaining space surrounding a 
chimney liner, gas vent, special gas vent, or 
plastic piping installed within a masonry 
chimney flue shaU not be used to vent another 
appHance. [NFPA 54: 12.6.8.1] 

Exception: The insertion of anotlier liner 
or vent within the chimney as provided 
in this code and the liner or vent 
manufacturer's instructions. 

510.5.8.2 The remaining space surrounding 
a chimney liner, gas vent, special gas vent, 
or plastic piping installed within a masonry 
chimney flue shall not be used to supply 
combustion air. [NFPA 54: 12.6.8.2] 

Exception: Direct-vent gas-fired 
appliances designed for installation in a 
solid-fuel-burning fireplace where 
installed in accordance with the listing 
and the manufacturer's instruction. 

510.6 Gas Vents. 

510.6.1 A gas vent passing through a roof shall 
extend through the entire roof flashing, roof jack, 
or roof thimble and be terminated with a listed 
termination cap. [NFPA 54: 10.6.1(3)] 

510.6.1.1 Type B or Type L vents shall 
extend in a generally vertical direction with 
offsets not exceeding 45 degrees, except that 
a vent system having not more than one 



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52 



WATER HEATERS 



510.6 



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60-degree offset shall be permitted. Any 
angle greater than 45 degrees from the 
vertical is considered horizontal. The total 
horizontal distance of a vent plus the 
horizontal vent connector serving draft- 
hood-equipped appliances shall not be 
greater than 75 percent of the vertical height 
of the vent. [NFPA 54: 10.6.1(4)] 

Exception; Systems designed and sized 
as provided in this chapter or in accor- 
dance with other approved engineering 
methods. 

510.6.1.2 Vents serving Category I fan- 
assisted appliances shall be installed in 
accordance with the appliance manufacturer's 
instructions and NFPA 54, Chapter 10 or 
other approved engineering methods. 
[NFPA 54: 12.7.1(3)] 

51 0.6.2 A gas vent shall terminate in accordance 
with one of the following [NFPA 54: 12.7.2(1)]: 

(1) Above the roof surface with a listed cap 
or listed roof assembly. Gas vents. 12 inches 
(300 mm) in size or smaller with listed 
caps shall be permitted to be terminated in 
accordance with Figure 5-2, provided they 
are at least 8 feet (2.4 m) from a vertical wall 
or similar obstruction. All other gas vents 
shall terminate not less than 2 feet (0.6 m) 
above the highest point where they pass 
through the roof and at least 2 feet (0.6 m) 
higher than any portion of a building within 
10 feet (3.1 m). [NFPA 54: 12.7.2(l)(a)] 

(2) Industrial gas utilization equipment as 
provided in Section 510.2.4. [NFPA 54: 12.72(l)(c)] 

(3) Direct-vent systems as provided in Section 
510.2.5. [NFPA 54: 12.7.2(l)(d)] 

(4) Equipment with integral vents as provided 
in Section 510.2.6. [NFPA 54: 12.7.2(l)(e)] 

(5) Mechanical draft systems as provided in 
Section 510.3.4. [NFPA 54: 12.7.2(l)(f)] 

(6) Ventilating hoods and exhaust systems 
as provided in Section 510.3.5. [NFPA 54: 
12.7.2(l)(g)] 

510.6.2.1 A Type B or a Type L gas vent 
shall terminate at least 5 feet (1.5 m) in 
vertical height above the highest connected 
equipment draft hood or flue collar. [NFPA 
54: 12.7.2(2)] 

51 0.6.2.2 A Type B-W gas vent shall terminate 
at least 12 feet (3.7 m) in vertical height 
above the bottom of the wall furnace. [NFPA 
54: 12.7.2(3)] 

51 0.6.2.3 A gas vent extending through an 
exterior wall shall not terminate adjacent to 



the wall or below eaves or parapets, except 
as provided in Sections 510.2.5 and 510.3.4. 
[NFPA 54: 12.7.2(4)] 

510.6.2.4 Decorative shrouds shall not be 
installed at the termination of gas vents 
except where such shrouds are listed for use 
with the spiecific gas venting system and are 
installed in accordance with manufacturers' 
installation instructions. [NFPA 54: 12.7.2(5)] 

51 0.6.2.5 All gas vents shall extend through 
the roof flashing, roof jack, or roof thimble 
and terminate with a listed cap or listed roof 
assembly. [NFPA 54: 12.7.2(6)] 

51 0.6.2.6 A gas vent shall terminate at least 
3 feet (0.9m) above a forced air inlet located 
within 10 feet (3.0m). [NFPA 54: 12.7.2(7)] 

510.6.3 Size of Gas Vents. Venting systems 
shall be sized and constructed in accordance 
with NFPA 54, Chapter 13 or other approved 
engineering methods and the gas vent and gas 
equipment manufacturers' instructions. [NFPA 
54: 12.7.3] 

510.6.3.1 Category I Appliances. The 

sizing of natural draft venting systems 
serving one or more listed appliances 
equipped with a draft hood or appliances 
listed for use with Type B gas vent, installed 
in a single story of a building, shall be in 
accordance with one of the following 
methods. [NFPA 54: 12.7.3.1] 

(1) The provisions of this chapter. [NFPA 
54: 12.7.3.1(1)] 

(2) Vents serving fan-assisted combustion 
system appliances, or combinations of 
fan-assisted combustion systems and 
draft hood-equipped appliances, shall 
be sized in accordance with this chapter 
or other approved engineering methods. 
[NFPA 54: 12.7.3.1(2)] 

(3) For sizing an individual gas vent for a 
single, draft-hood-equipped appliance, 
the effective area of the vent connector 
and the gas vent shall be not less than 
the area of the appliance draft hood 
outlet or greater than seven times the 
draft hood outiet area. [NFPA 54: 12.7.3.1(3)] 

(4) For sizing a gas vent cormected to two 
appliances with draft hoods, the effective 
area of the vent shall be not less than the 
area of the larger draft hood outlet plus 
50 percent of the area of the smaller draft 
hood outlet or greater than seven times 
the smaller draft hood outlet area. 
[NFPA 54: 12.7.3.1(4)] 



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53 



510.6 -Table 5-3 



UNIFORM PLUMBING CODE 



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(5) Approved engineering practices. [NFPA 
54: 12.7.3.1(5)] 

510.6.3.2 Category 11, Category III, and 
Category IV Appliances. The sizing of gas 
vents for Category II, Category III, and 
Category IV gas utilization equipment shall 
be in accordance w^ith the equipment 
manufacturers' instructions. [NFPA 54: 
12.7.3.3] 

510.6.3.3 Sizing. Chinmey venting systems 
using mechanical draft shall be sized in 
accordance with approved engineering 
methods. [NFPA 54: 12.7.3.4] 

510.6.4 Gas Vents Serving Equipment on 
More Than One Floor. 

510.6.4.1 A common gas vent shall be 
permitted in multistory installations to vent 
Category I gas utilization equipment located 
on more than one floor level, provided the 
venting system is designed and installed in 
accordance with approved engineering 
methods. 



For the purpose of this section, crawl spaces, 
basements, and attics shall be considered as 
floor levels. [NFPA 54: 12.7.4.1] 

510.6.4.2 All gas utilization equipment 
connected to the common vent shall be 
located in rooms separated from a habitable 
space. Each of these rooms shall have 
provisions for an adequate supply of 
combustion, ventilation, and dilution air 
that is not supplied from a habitable space. 
(See Figure 5-3.) [NFPA 54: 12.7.4.2] 

The size of the connectors and 
comm^on segments of multistory venting 
systems for gas utilization equipment listed 
for use with Type B double-wall gas vent 
shall be in accordance with Table 5-14, 
provided [NFPA 54: 12.7.4.3]: 

(1) The available total height (H) for each 
segment of a multistory venting system is 
the vertical distance between the level of 
the highest draft hood outlet or flue collar 
on that floor and the centerline of the next 
highest interconnection tee. (See Figure 
G.l(K).) [NFPA 54: 12.7.4.3(1)] 



TABLE 5-3 
Clearance for Connectors [NFPA 54: Table 12.8.4.4] 



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Minimum Distance from Combustible Material 



Eq ui pment 



Listed Type B 
Gas Vent Material 



Listed Type L 
Vent Material 



Single-Wall 
M etal Pipe 



Factory-Built 
Chimney Sections 



Listed equipment with 
draft hoods and equip- 
ment listed for use with 
Type B gas vents 



As listed 



As listed 



6 in. 



As listed 



Residential boilers and 
furnaces with listed gas 
conversion burner and 
with draft hood 



6 in. 



6 in. 



9 in. 



As listed 



Residential appliances 
listed for use with Type L 
vents 



Not permitted 



As listed 



9 in. 



As listed 



Residential incinerators 


Not permitted 


9 in. 


18 in. 


As listed 


Listed gas-fired toilets 


Not permitted 


As listed 


As listed 


As listed 


Unlisted residential 
appliances with draft 
hood 


Not permittted 


6 in. 


9 in. 


As listed 


Residential and low-heat 
equipment other than 
those above 


Not permitted 


9 in. 


18 in. 


As listed 


Medium-heat equipment 


Not permitted 


Not permitted 


36 in. 


As listed 



For SI units, 1 in.= 25.4 mm. 

Note: These clearances shall apply unless the listing of an appliance or connector specifies clearances, in which case the listed clearances 

shall apply. 



54 



WATER HEATERS 



510.6-510.7 



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(2) The size of the connector for a segment is 
determined from its gas utilization equipment 
heat input and available connector rise, and 
shall not be smaller than the draft hood outlet 
or flue collar size. [NFPA 54: 12.7.4.3(2)] 

(3) The size of the common vertical vent 
segment, and of the interconnection tee at 
the base of that segment, shall be based on 
the total gas utilization equipment heat 
input entering that segment and its available 
total height. [NFPA 54: 12.7.4.3(3)] 

510.6.5 Support of Gas Vents. Gas vents shall 
be supported and spaced in accordance with 
their listings and the manufacturers' instructions. 
[NFPA 54: 12.7.5] 

510.6.6 Marking. In those localities where solid 
and liquid fuels are used extensively, gas vents 
shall be permanently identified by a label 
attached to the wall or ceiling at a point where 
the vent connector enters the gas vent. The label 
shall read: "This gas vent is for appliances that 
bum gas. Do not connect to solid- or liquid-fuel- 
burning appliances or incinerators." The 
Authority Having Jurisdiction shall determine 
whether its area constitutes such a locality. 
[NFPA 54: 12.7.6] 

510.7 Single-Wall Metal Pipe. 

510.7.1 Construction. Single-wall metal pipe 
shall be constructed of galvanized sheet steel not 
less than 0.0304 inch (0.7 mm) thick or of other 
approved, noncombustible, corrosion-resistant 
material. [NFPA 54: 12.8.1] 

510.7.2 Cold Climate. Uninsulated single-wall 
metal pipe shall not be used outdoors in cold 
climates for venting gas utilization equipment 
in regions where the 99 percent winter design 
temperature is below 32° Fahrenheit. 

[NFPA 54: 12.8.2] 

510.7.3 Termination. The termination of single- 
wall metal pipe shall comply with the following 
requirements [NFPA 54: 12.8.3]: 

510.7.3.1 Single-wall metal pipe shall 
terminate at least 5 feet (1.5 m) in vertical 
height above the highest connected equip- 
ment draft hood outlet or flue collar. 
[NFPA 54: 12.8.3(1)] 

510.7.3.2 Single-wall metal pipe shall 
extend at least 2 feet (0.6 m) above the highest 
point where it passes through the roof of a 
building and at least 2 feet (0.6 m) higher than 
any portion of a building within a horizontal 
distance of 10 feet (3.1 m). [See Figure 5-1.] 
[NFPA 54: 12.8.3(2)] 

51 0.7.3.3 An approved cap or roof assembly 
shall be attached to the terminus of a single- 



wall metal pipe. [Also see Section 510.7.4.2.] 
[NFPA 54: 12.8.3(3)] 

510.7.4 Installation with Equipment Permitted 
by 510.4.1. 

510.7.4.1 Single-wall metal pipe shall be 
used only for runs directly from the space 
in which the gas utilization equipment is 
located through the roof or exterior wall to 
the outer air. A pipe passing through a 
roof shall extend without interruption 
through the roof flashing, roof jacket, or 
roof thimble. [NFPA 54: 12.8.4.1] 

510.7.4.2 Single-wall metal pipe shall not 
originate in any unoccupied attic or 
concealed space and shall not pass through 
any attic, inside wall, concealed space, or 
floor. For the installation of a single-wall 
metal pipe through an exterior combustible 
wall, see Section 510.10.14.2. [NFPA 54: 12.8.4.2] 

510.7.4.3 Single-wall metal pipe used for 
venting an incinerator shall be exposed and 
readily examinable for its full length and 
shall have suitable clearances maintained. 
[NFPA 54: 12.8.4.3] 

510.7.4.4 Minimum clearances from single- 
wall metal pipe to combustible material shall 
be in accordance with Table 5-3. Reduced 
clearances from single-wall metal pipe to 
combustible material shall be as specified for 
vent connector in Table 5-4. [NFPA 54: 12.8.4.4] 

510.7.4.5 Where a single-wall metal pipe 
passes through a roof constructed of 
combustible material, a noncombustible, 
nonventilating thimble shall be used at the 
point of passage. The thimble shall extend at 
least 18 inches (460 mm) above and 6 inches 
(150 mm) below the roof with the annular 
space open at the bottom and closed only at 
the top. The thimble shall be sized in 
accordance with Section 510.10.14.2. [NFPA 
54: 12.8.4.5] 

510.7.5 Size of Single-Wall Metal Pipe. Single- 
wall metal piping shall comply with the 
following requirements [NFPA 54: 12.8.5]: 

510.7.5.1 A venting system of a single-wall 
metal pipe shall be sized in accordance with 
one of the following methods and the gas 
equipment manufacturer's instructions 
[NFPA 54: 12.8.5(1)]: 

(1) For a draft-hood-equipped appliance, in 
accordance with this chapter. 

[NFPA 54: 12.8.5(l,a)] 

(2) For a venting system for a single 
appliance with a draft hood, the areas of 
the connector and the pipe each shall 



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55 



Table 5-4 



UNIFORM PLUMBING CODE 



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Table 5-4 
Reduction of Clearances with Specified Foirms of Protection [NFPA 54: Table 10.2.3(b)] 

Where the required clearance with no protection from appliance, vent connector, or 
single-wall metal pipe is: 



36 in. 



18 in. 



12 in. 



9 in. 



6 in. 



Allowable Clearances with Specified Protection (in.) 



Type of protection applied 
to and covering all surfaces 
of combustible material 



Use Col. 1 for clearances above appliance or horizontal connector. Use Col. 2 for 
clearances from appliances, vertical connector, and single-wall metal pipe. 



as the required clearance 




Sides 


Sides 




Sides 


Sides 




Sides 


with no protection [See 




and 


and 




and 


and 




and 


Figures 5-4 


Above 


Rear 


Above Rear 


Above 


Rear 


Above Rear 


Above 


Rear 


through 5-6.] 


Col.1 


Col. 2 


Col. 1 Col. 2 


Col.1 


Col. 2 


Col. 1 Col. 2 


Col.1 


Col. 2 



(1)3-1/2 in. thick masonry - 24 ~ 12 

wall without ventilated air 

space 

(2) 1/2 in. insulation board 24 18 12 9 
over 1 in. glass fiber or 

mineral wool batts 

(3) 0.024 sheet metal over 18 12 9 6 
1 in. glass fiber or mineral 

wool batts reinforced with 
wire on rear face with 
ventilated air space 

(4) 3-1/2 in. thick masonry - 12 ~ 6 
wall with ventilated air 

space 

(5) 0.024 sheet metal with 18 12 9 6 
ventilated air space 

(6) 1/2 in. thick insulation 18 12 9 6 
board with ventilated air 

space 

(7) 0.024 sheet metal with 18 12 9 6 
ventilated air space over 

0.024 sheet metal with 
ventilated air space 

(8) 1 in. glass fiber or 18 12 9 6 
mineral wool batts 

sandwiched between two 
sheets 0.024 sheet metal 
with ventilated ak space 



6 4 

6 4 

6 4 

6 4 



5 3 

5 3 

5 3 

5 3 



3 2 

3 3 

3 3 

3 3 



For SI tmits, 1 in. = 25.4 mm. 
Notes: 

1. Reduction of clearances from com.bustible materials shall not interfere with combustion air^ draft hood clearance and relief, and 
accessibility of servicing. 

2. All clearances shall be measured from the outer surface of the combustible material to the nearest point on the surface of the appUance, 
disregarding any intervening protection applied to the combustible material. 

3. Spacers and ties shall be of noncombustible material. No spacer or tie shall be used directly opposite the appliance or cormector. 

4. Where all clearance reduction systems use a ventilated air space, adequate provision for air circulation shall be provided as described. 
[See Figure 5-5 and Figure 5-6.] 

5. There shall be at least 1 in. (25 mm) between clearance reduction systems and combustible walls and ceilings for reduction systems using 
a ventilated air space. 

6. Where a wall protector is mounted on a single flat wall away from corners, it shall have a minimum 1 inch (25 mm) air gap. To provide 
adequate air circulation, the bottom and top edges, or only the side and top edges, or all edges shall be left open. 

7. Mineral wool batts (blanket or board) shall have a minimum density of 8 Ib/ff (128 kg/m^) and a minimum melting point of 1,500°F (816°C). 

8. Insulation material used as part of a clearance reduction system shall have a thermal conductivity of 1.0 Btu in./ft^ /h-°F (0.144 W/m-K) 
or less. 

9. There shall be at least 1 inch (25 mm) between the appliance and the protector. In no case shall the clearance between the appliance and 
the combustible surface be reduced below that allowed in this table. 

10. All clearances and thicknesses are minimimi; larger clearances and thicknesses are acceptable. 

11. Listed single- wall connectors shall be installed in accordance with the terms of their listing and the manufacturers' instructions. 



56 



WATER HEATERS 



Figure 5-4 -51 0.7 



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Construction using combustible — < 
material, plastered or unplastered 



2 



M 



M M 



M 



Combustible wall 




^^^^ 




Sheet metal or 
other protection 

•* — Gas equipment 
or vent connector 



Notes: 

A - Equals the clearance with no protection specified in 
Tables 5-3 and 5-4 and in the sections applying to 
various types of equipment. 

B - Equals the reduced clearance permitted in 
accordance with Table 5-3. The protection applied to the 
construction using combustible material shall extend far 
enough in each direction to make C equal to A. 

FIGURE 5-4 Extent of Protection Necessary to 
Reduce Clearances from Gas Equipment or Vent 
Connectors. [NFPA 54: Figure 10.3.2.2(1)] 



Mounted with side 
and top edges open 



Mounted with top 
and bottom edges 
open 



Wall protector mounted 
on single flat wall 



Must be mounted with top 
and bottom edges open 




Wall protector installed in comer 




/ y» Nail or screw anchor 

( — Clearance 

reduction system 



1 in. (25 mm) nonpombustible 
spacer such as stacked washers, 
small-diameter pipe, tubing, or 
eteclrical conduit. 



Masonry walls can be attached to combustible walls 
using wall ties. Spacers should not be used directly 
behind appliance or connector. 

FIGURE 5-5 Wall Protection Reduction System. 

[NFPA 54: Figure 1 0.3.2.2(2)] 



1 in. (25 mm) ^^' 
minimum air space 
between masonry 
and combustible wall 



4 in. (100 mm) 
nominal brick wa! 



Bottom and top course 
of bricks staggered for 
ventilation 




Corrugated 
metal wall 
ties 



A strip of heavy-gauge stee 
used for added support 

Note: Do not place masonry wall ties directly 
behind appliance or connector. 




Masonry wall tie 



FIGURE 5-6 Masonry Clearance Reduction System. 
[NFPA 54: Figure 10.3.2.2(3)] 

Minimum Thickness for Galvanized Steel Vent 
Connector for Low-Heat Appliances 

[NFPA 54: Table 12.11.2.5] 



Diameter of 
Connector (In.) 



Minimum Thickness 
(in.)* 



Less than 6 

6 to less than 10 

10 to 12 inclusive 

14 to 16 inclusive 

Over 16 



0.019 
0.023 
0.029 
0.034 
0.056 



* For SI units, 1 in. = 25.4 mm; 1 in.' = 645 nriml 

not be less than the area of the 
appliance flue collar or draft hood 
outlet, whichever is smaller. The vent 
area shall not be greater than seven 
times the draft hood outlet area. 
[NFPA 54: 12.8.5(l,b)] 

(3) Other approved engineering methods. 
[NFPA 54: 12.8.5(l,c)] 

51 0.7.5.2 Where a single-wall metal pipe is 
used and has a shape other than round, it 
shall have an equivalent effective area equal 
to the effective area of the round pipe for 
which it is substituted, and the minimum 
internal dimension of the pipe shall be 2 
inches (50 mm). [NFPA 54: 12.8.5(2)] 

510.7.5.3 The vent cap or a roof assembly 
shall have a venting capacity not less than 
that of the pipe to which it is attached. 
[NFPA 54: 12.8.5(3)] 



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57 



510.7-510.10 



UNIFORM PLUMBING CODE 



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510.7.6 Support of Single-Wall Metal Pipe. 

All portions of single-wall metal pipe shall be 
supported for the design and weight of the 
material employed. [NFPA 54: 12.8.6] 

510.7.7 Marking. Single-wall metal pipe shall 
comply with the marking provisions of Section 
510.6.6. [NFPA 54: 12.8.7] 

510.8 Through-the-Wall Vent Termination. (See 
Figure 5-12.) 

51 0.8.1 A mechanical draft venting system shall 
terminate at least 3 feet (0.9 m) above any forced 
air inlet located within 10 feet (3.1 m). [NFPA 54: 
12.9.1] 

Exception No. 1: This provision shall not 
apply to the combustion air intake of a 
direct-vent appliance. 

Exception No. 2: This provision shall not 
apply to the separation of the integral 
outdoor air inlet and flue gas discharge of 
listed outdoor appliances. 

510.8.2 A mechanical draft venting system of 
other than direct-vent type shall terminate at 
least 4 feet (1.2 m) below, 4 feet (1.2 m) horizon- 
tally from, or 1 foot (300 mm) above any door, 
operable window, or gravity air inlet into any 
building. The bottom of the vent terminal shall 
be located at least 12 inches (300 mm) above grade. 

[NFPA 54: 12.9.2] 

510.8.3 The vent terminal of a direct-vent 
appliance with an input of 10,000 Btu/h (3 kW) 
or less shall be located at least 6 inches (150 mm) 
from any air opening into a building, and such 
an appliance with an input over 10,000 Btu/h (3 
kW) but not over 50,000 Btu/h (14.7 kW) shall be 
installed with a 9-inch (230 mm) vent termination 
clearance, and an appliance with an input over 
50,000 Btu/h (14.7 kW) shall have at least a 12 inch 
(300-mm) vent termination clearance. The bottom 
of the vent terminal and the air intake shall be 
located at least 12 inches (300 mm) above grade. 
[NFPA 54: 12.9.3] 

510.8.4 Through-the-wall vents for Category II 
and Category IV appliances and noncategorized 
condensing appliances shall not terminate over 
public walkways or over an area where conden- 
sate or vapor could create a nuisance or hazard or 
could be detrimental to the operation of regu-lators, 
relief valves, or other equipment. Where local 
experience indicates that condensate is a problem 
with Category I and Category III appU-ances, this 
provision shaU also apply. [NFPA 54: 12.9.4] 

510.9 Condensation Drain. 

510.9.1 Provision shall be made to collect and 
dispose of condensate from venting systems 



serving Category II and Category IV gas 
utilization equipment and noncategorized 
condensing appliances in accordance with 
Section 510.8.4. [NFPA 54: 12.10.1] 

510.9.2 Where local experience indicates that 
condensation is a problem, provision shall be 
made to drain off and dispose of condensate 
from venting systems serving Category I and 
Category III gas utilization equipment in 
accordance with 510.8.4. [NFPA 54: 10.9.2] 

510.10 Vent Connectors for Category I Gas 
Utilization Equipment. 

510.10.1 Where Required. A vent cormector 
shall be used to connect gas utilization 
equipment to a gas vent, chimney, or single- 
wall metal pipe, except where the gas vent, 
chimney, or single-wall metal pipe is directly 
connected to the equipment. [NFPA 54: 12.11.1] 

510.10.2 Materials. 

51 0.1 0.2.1 A vent connector shall be made of 
noncombustible, corrosion resis-tant material 
capable of withstanding the vent gas temper- 
ature produced by the gas utilization equip- 
ment and of sufficient thickness to withstand 
physical damage. [NFPA 54: 12.11.2.1] 

510.10.2.2 Where the vent cormector used 
for gas utilization equipment having a draft 
hood or a Category I appliance is located in 
or passes through an unconditioned area, 
that portion of the vent connector shall be 
Usted Type B, Type L, or listed vent material 
having equivalent insulation qualities. 
[NFPA 54: 12.11.2.2] 

Exception: Single-wall metal pipe 
located within the exterior walls of the 
building and located in areas having a 
local 99 percent winter design temperature 
of 5°F or higher. 

510.10.2.3 Where the vent connector used 
for gas utilization equipment having a draft 
hood or a Category I appliance is located in 
or passes through attics and crawl spaces, 
that portion of the vent connector shall be 
listed Type B, Type L, or listed vent material 
having equivalent insulation qualities. 
[NFPA 54: 12.11.2.3] 

510.10.2.4 Vent connectors for residential- 
type appliances shall comply with the 
following: [NFPA 54: 12.11.2.4] 

(1) Vent Connectors Not Installed in Attics, 
Crawl Spaces, or Other Unconditioned 
Areas. Vent connectors for listed gas 



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58 



WATER HEATERS 



510.10 



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appliances having draft hoods and for 
appliances having draft hoods and 
equipped with listed conversion burners 
that are not installed in attics, crawl spaces, 
or other unconditioned areas shall be one of 
the following: 

(a) Type B or Type L vent material. 

(b) Galvanized sheet steel not less than 
0.018-inches (0.46 mm) thick. 

(c) Aluminum (1100 or 3003 alloy or 
equivalent) sheet not less than 0.027- 
inches (0.69 mm) thick. 

(d) Stainless steel sheet not less than 0.012- 
inches (0.31 mm) thick. 

(e) Smooth interior wall metal pipe having 
resistance to heat and corrosion equal to 
or greater than that of b, c, or d above. 

(f) A listed vent connector. 

(2) Vent connectors shall not be covered 
with insulation. 

Exception; Listed insulated vent 
connectors shall be installed according to 
the terms of their listing. 

510.10.2.5 A vent connector for non- 
residential low-heat equipment shall be a 
factory-built chimney section or steel pipe 
having resistance to heat and corrosion 
equivalent to that for the appropriate 
galvanized pipe as specified in Table 5-5. 
Factory-built chimney sections shall be 
joined together in accordance with the 
chimney manufacturer's instructions. 
[NFPA 54: 12.11.2.5] 

510.10.2.6 Vent connectors for medium- 
heat equipment and commercial and 
industrial incinerators shall be constructed 
of factory-built, medium-heat chimney 
sections or steel of a thickness not less than 
that specified in Table 5-6 and shall comply 
with the following: [NFPA 54: 12.11.2.6] 

(1) A steel vent connector for equipment 
with a vent gas temperature in excess of 
1,000°F (538°C) measured at the entrance to 
the connector shall be lined with medium- 
duty fire brick (ASTM C 64, Specification for 
Refractories for Incinerators and Boilers, 
Type F) or the equivalent. 

(2) The lining shall be at least 2-1/2 inches 
(64 mm) thick for a vent connector having a 
diameter or greatest cross-sectional dimension 
of 18 inches (460 mm) or less. 

(3) The lining shall be at least 4-1/2 inches 
(110 mm) thick laid on the 4-1/2 inch (110- 



mm) bed for a vent connector having a 
diameter or greatest cross-sectional 
dimension greater than 18 inches (460 mm). 

(4) Factory-built chimney sections, if 
employed, shall be joined together in 
accordance with the chimney manufacturer's 
instructions. 

TABLE 5-6 

Minimum Thickness for Steei Vent Connectors 

for Medium-Heat Equipment and Commercial and 

Industrial Incinerators 

[NFPA 54: Table 12.11.2,6] 



Vent Connector Size 






Minimum 


Diameter (in.) 


Area (in.^) 


Thickness (in.) 


Up to 14 


Up to 154 


0.053 


Over 14 to 16 


154 to 201 


0.067 


Over 16 to 18 


201 to 254 


0.093 


Over 18 


Larger than 254 0.123 



For SI units, 1 in. = 25.4 mm; 1 in." - 645 mm-. 

510.10.3 Size of Vent Connector. 

510.10.3.1 A vent connector for gas 
utilization equipment with a single draft 
hood or for a Category I fan-assisted 
combustion system appliance shall be sized 
and installed in accordance with this chapter 
or other approved engineering methods. 
[NFPA 54: 12.11.3.1] 

510.10.3.2 For a single appliance having 
more than one draft hood outlet or flue 
collar, the manifold shall be constructed 
according to the instructions of the appliance 
manufacturer. Where there are no instruc- 
tions, the manifold shall be designed and 
constructed in accordance with approved 
engineering practices. As an alternate 
method, the effective area of the manifold 
shall equal the combined area of the flue collars 
or draft hood outlets, and the vent connectors 
shall have a minimum 1-foot (0.3 m) rise. 
[NFPA 54: 12.11.3.2] 

510.10.3.3 Where two or more gas appliances 
are connected to a common vent or chimney, 
each vent connector shall be sized in accord- 
ance with this chapter or other approved 
engineering methods. [NFPA 54: 12.11.3.3] 
As an alternative method applicable only 
when all of the appliances are draft-hood- 
equipped, each vent connector shall have an 



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59 



510.10 



UNIFORM PLUMBING CODE 



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effective area not less than the area of the 
draft hood outlet of the appliance to which it is 
connected. [NFPA 54: 12.11.3.4] 

510.10.3.4 Where two or more gas appliances 
are vented through a common vent connector 
or vent manifold,- the common vent connec- 
tor or vent manifold shall be located at the 
highest level consistent with available head- 
room and clearance to combustible material 
and shall be sized in accordance with this 
chapter or other approved engineering 
methods. [NFPA 54: 12.11.3.5] 

As an alternate method applicable only 
where there are two draft-hood-equipped 
appliances, the effective area of the common 
vent connector or vent manifold and all 
junction fittings shall be not less than the 
area of the larger vent connector plus 50 
percent of the areas of smaller flue collar 
outlets. [NFPA 54: 12.11.3.6] 

510.10.3.5 Where the size of a vent connec- 
tor is increased to overcome installation 
limitations and obtain connector capacity 
equal to the equipment input, the size 
increase shall be made at the equipment 
draft hood outlet. [NFPA 54: 12.11.3.7] 

510.10.4 Two or More Appliances Connected 
to a Single Vent. 

510.10.4.1 Where two or more vent 
connectors enter a common gas vent, 
chiinney flue, or single-wall metal pipe, the 
smaller cormector shall enter at the highest 
level consistent with the available headroom 
or clearance to combustible material. 
[NFPA 54: 12.11.4.1] 

510.10.4.2 Vent connectors serving 
Category I appliances shall not be connected 
to any portion of a mechanical draft system 
operating under positive static pressure, 
such as those serving Category III or 
Category IV appliances. [NFPA 54: 12.11.4.2] 

510.10.5 Clearance. Minimum clearances 
from vent connectors to combustible material 
shall be in accordance with Table 5-3. [NFPA 
54: 12.11.5] 

Exception: The clearance between a vent 
connector and combustible material shall be 
permitted to be reduced where the com- 
bustible material is protected as specified for 
vent connectors in Table 5-4. 

510.10.6 Avoid Unnecessary Bends. A vent 
cormector shall be installed so as to avoid turns 
or other construction features that create 



excessive resistance to flow of vent gases. [NFPA 
54: 12.11.6] 

510.10.7 Joints. Joints between sections of 
connector piping and connections to flue collars 
or draft hood outlets shall be fastened in 
accordance with one of the following methods: 
[NFPA 54: 12.11.7] 

(1) By sheet metal screws. 

(2) Vent cormectors of listed vent material shall 
be assembled and connected to flue collars 
or draft hood outlets in accordance with the 
manufacturers' instructions. 

(3) Other approved means. 

510.10.8 Slope. A vent connector shall be 
installed without any dips or sags and shall 
slope upward toward the vent or chimney at 
least 1/4 in./ft. (20 mm/m). [NFPA 54: 12.11.8] 

Exception: Vent connectors attached to a 
mechanical draft system installed in accordance 
with the manufacturers' instructions. 

510.10.9 Length of Vent Connector. 

510.10.9.1 A vent connector shall be as 
short as practical and the gas utilization 
equipment located as close as practical to 
the chimney or vent. [NFPA 54: 12.11.9.1] 

510.10.9.2 The maximum horizontal length 
of a single- wall connector shall be 75 percent 
of the height of the chimney or vent except 
for engineered systems. The maximum 
length of an individual connector for a 
chimney or vent system serving multiple 
appliances, from the appliance outlet to the 
junction with the common vent or another 
connector, shall be 100 percent of the height 
of the chimney or vent. [NFPA 54: 12.11.9.2] 

51 0.1 0.9.3 The maximum horizontal length 
of a Type B double-wall connector shall be 
100 percent of the height of the chimney or 
vent, except for engineered systems. The 
maximum length of an individual connector 
for a chimney or vent system serving 
multiple appliances, from the appliance 
outlet to the junction with the common vent 
or another connector, shall be 100 percent of 
the height of the chimney or vent. [NFPA 
54:12.11.9.3] 

510.10.10 Support. A vent connector shall be 
supported for the design and weight of the 
material employed to maintain clearances and 
prevent physical damage and separation of joints. 
[NFPA 54: 12.11.10] 



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60 



WATER HEATERS 



510.10-510.12 



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510.10.11 Chimney Connection. Where 
entering a flue in a masonry or metal chimney, 
the vent connector shall be installed above the 
extreme bottom to avoid stoppage. Where a 
thimble or slip joint is used to facilitate removal 
of the connector, the connector shall be firmly 
attached to or inserted into the thimble or slip 
joint to prevent the cormector from falling out. 
Means shall be employed to prevent the 
connector from entering so far as to restrict the 
space between its end and the opposite wall of 
the chimney flue. [NFPA 54: 12.11.11] 

510.10.12 Inspection. The entire length of a 
vent connector shall be readily accessible for 
inspection, cleaning, and replacement. [NFPA 
54: 12.11.12] 

510.10.13 Fireplaces. A vent connector shall 
not be connected to a chimney flue serving a 
fireplace unless the fireplace flue opening is 
permanently sealed. [NFPA 54: 12.11.13] 

510.10.14 Passage through Ceilings, Floors, 
or Walls. 

510.10.14.1 A vent connector shall not pass 
through any ceiling, floor, or fire-resistance- 
rated wall. A single-wall metal pipe 
connector shall not pass through any 
interior wall. 

Exception: Vent connectors made of 
listed Type B or Type L vent material 
and serving listed equipment with draft 
hoods and other equipment listed for 
use with Type B gas vents that pass 
through walls or partitions constructed 
of combustible material shall be installed 
with not less than the listed clearance to 
combustible material. 

510.10.14.2 A vent connector made of a 
single-wall metal pipe shall not pass 
through a combustible exterior wall unless 
guarded at the point of passage by a 
ventilated metal thimble not smaller than 
the following: [NFPA 54: 12.11.14.2] 

(1) For listed appliances equipped with 
draft hoods and appliances listed for 
use with Type B gas vents, the thim- 
ble shall be a minimum of 4 inches (100 
mm) larger in diameter than the vent 
cormector. Where there is a run of not 
less than 6 feet (1.8 m) of vent connector in 
the opening between the draft hood 
outlet and the thimble, the thimble shall 



be a minimum of 2 inches (50 mm) larger 
in diameter than the vent connector. 

(2) For unlisted appliances having draft 
hoods, the thimble shall be a minimum 
of 6 inches (150 mm) larger in diameter 
than the vent connector. 

(3) For residential and low-heat appliances, 
the thimble shall be a minimum of 12 
inches (300 mm) larger in diameter than 
the vent connector. 

Exception: In lieu of thimble 
protection, all combustible material 
in the wall shall be removed from 
the vent connector a sufficient 
distance to provide the specified 
clearance from such vent connector 
to combustible material. Any 
material used to close up such 
opening shall be noncombustible. 

510.10.14.3 Vent connectors for medium- 
heat equipment shall not pass through walls 
or partitions constructed of combustible 
material. [NFPA 54: 12.11.14.3] 

510.11 Vent Connectors for Category II, 
Category III, and Category IV Gas Utilization 
Equipment. (See Section 510.4.) [NFPA 54: 12.12] 

510.12 Draft Hoods and Draft Controls. 

510.12.1 Equipment Requiring Draft 
Hoods. Vented gas utilization equipment 
shall be installed with draft hoods. 
[NFPA 54: 12.13.1] 

Exception: Dual oven-type combination 
ranges; incinerators; direct-vent 
equipment; fan-assisted combustion 
system appliances; equipment requiring 
chimney draft for operation; single 
firebox boilers equipped with 
conversion burners with inputs greater 
than 400,000 Btu/h (117 kW); equipment 
equipped with blast, power, or pressure 
burners that are not listed for use with 
draft hoods; and equipment designed 
for forced venting. 

510.12.2 Installation. A draft hood supplied 
with or forming a part of listed vented gas 
utilization equipment shall be installed 
without alteration, exactly as furnished and 
specified by the equipment manufacturer. 
[NFPA 54: 12.13.2] If a draft hood is not 
supplied by the equipment manufacturer 
where one is required, a draft 
hood shall be installed, be of a listed or 



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61 



510.12-511.1 



UNIFORM PLUMBING CODE 



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approved type, and, in the absence of other 
instructions, be of the same size as the 
equipment flue collar. Where a draft hood is 
required with a conversion burner, it shall 
be of a listed or approved type. [NFPA 54: 
12.13.2.1] Where it is determined that a draft 
hood of special design is needed or 
preferable for a particular installation, the 
installation shall be in accordance with the 
recommendations of the equipment 
manufacturer and shall be with the approval 
of the Authority Having Jurisdiction. 
[NFPA 54: 12.13.2.2] 

510.12.3 Draft-Control Devices. Where a 
draft-control device is part of the gas 
utilization equipment or is supplied by the 
equipment manufacturer, it shall be installed 
in accordance with the manufacturer's 
instructions. In the absence of manufacturer's 
instructions, the device shall be attached to 
the flue collar of the equipment or as near to 
the equipment as practical. [NFPA 
54: 12.13.3] 

510.12.4 Additional Devices. Gas utilization 
equipment (except incinerators) requiring 
controlled chimney draft shall be permitted 
to be equipped with a listed double-acting 
barometric draft regulator installed and 
adjusted in accordance with the manufacturers' 
instructions. [NFPA 54: 12.13.4] 

510.12.5 Location. Draft hoods and 
barometric draft regulators shall be installed 
in the same roon\ or enclosure as the 
equipment in such a manner as to prevent 
any difference in pressure between the hood 
or regulator and the combustion air supply. 
[NFPA 54: 12.13.5] 

510.12.6 Positioning. Draft hoods and 
draft regulators shall be installed in the 
position for which they were designed 
with reference to the horizontal and 
vertical planes and shall be located so that 
the relief opening is not obstructed by any 
part of the equipment or adjacent 
construction. The equipment and its draft 
hood shall be located so that the relief 
opening is accessible for checking vent 
operation. [NFPA 54: 12.13.6] 

510.12.7 Clearance. A draft hood shall be 
located so that its relief opening is not less 
than 6 inches (150 mm) from any surface 
except that of the equipment it serves and 
the venting system to which the draft 
hood is connected. Where a greater or 



lesser clearance is indicated on the 
equipment label, the clearance shall not be 
less than that specified on the label. Such 
clearances shall not be reduced. [NFPA 
54: 12.13.7] 

510.13 Manually Operated Dampers. A 

manually operated damper shall not be placed 
in any equipment vent connector. Fixed baffles 
shall not be classified as manually operated 
dampers. [NFPA 54: 12.14] 

510.14 Automatically Operated Vent Dampers. 

An automatically operated vent damper shall 
be of a listed type. [NFPA 54: 12.15] 

510.15 Obstructions. Devices that retard the 
flow of vent gases shall not be installed in a vent 
comiector, chimney, or vent. The following shall 
not be considered as obstructions: [NFPA 
54: 12.16] 

(1) Draft regulators and safety controls 
specifically listed for installation in venting 
systems and installed in accordance with the 
terms of their listing. 

(2) Approved draft regulators and safety 
controls designed and installed in accor- 
dance with approved engineering methods. 

(3) Listed heat reclaimers and automatically 
operated vent dampers installed in 
accordance with the terms of their listing. 

(4) Vent dampers serving listed appliances 
installed in accordance with this chapter or 
other approved engineering methods. 

(5) Approved economizers, heat reclaimers, 
and recuperators installed in venting 
systems of equipment not required to be 
equipped with draft hoods, provided the 
gas utilization equipment manufacturer's 
instructions cover the installation of such a 
device in the venting system and 
performance in accordance with Sections 
510.3.1 and 510.3.2 is obtained. 

51 1 .0 Sizing of Category I Venting Systems. 

51 1 .1 These venting tables shall not be used where 
obstructions (see Section 510.15) are installed in the 
venting system. The installation of vents serving 
listed appliances with vent dampers shall be in 
accordance with the appliance manufacturer's 
instructions or in accordance with the following: 
[NFPA 54: 13.1.1] 

(1) The maximum capacity of the vent system shall 
be determined using the NAT Max column. 

(2) The minimum capacity shall be determined as 
though the appliance were a fan-assisted 
appliance, using the FAN Min column to 



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62 



WATER HEATERS 



511.1 



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determine the mininium capacity of the vent 
system. Where the corresponding "FAN Min" is 
"NA" the vent configuration shall not be per- 
mitted and an alternative venting configuration 
shall be utilized. 

511.1.1 Where the vent size determined from 
the tables is smaller than the appliance draft 
hood outlet or flue collar, the use of the smaller 
size shall be permitted provided that the 
installation complies with all of the following 
requirements: [NFPA 54: 13.1.2] 

(1) The total vent height (H) is at least 10 feet (3 m). 

(2) Vents for appliance draft hood outlets or flue 
collars 12 inches (300 mm) in diameter or 
smaller are not reduced more than one table 
size. 

(3) Vents for appliance draft hood outlets or flue 
collars larger than 12 inches (300 mm) in 
diameter are not reduced more than two 
table sizes. 

(4) The maximum capacity listed in the tables 
for a fan-assisted appliance is reduced by 
10 percent (0.90 maximum table capacity). 

(5) The draft hood outlet is greater than 4 inches 
(100 mm) in diameter. Do not connect a 3-inch 
(80mm) diameter vent to a 4-inch (100mm) 
diameter draft hood outlet. This provision 
shall not apply to fan-assisted appliances. 

511.1.2 Single-appliance venting configurations 
with zero (0) lateral lengths in Tables 5-8, 5-9, 
and 5-12 shall have no elbows in the venting 
system. For vent configurations with lateral 
lengths, the venting tables include allowance for 
two 90-degree turns. For each additional elbow up 
to and including 45 degrees, the maximum capacity 
listed in the venting tables shall be reduced by 5 
percent. For each elbow greater than 45 degrees 
up to and including 90 degrees, the maximum 
capacity listed in the venting tables shall be 
reduced by 10 percent. [NFPA 54: 13.1.3] 

51 1 .1 .3 Zero (0) lateral (L) shall apply only to a 
straight vertical vent attached to a top outlet 
draft hood or flue collar. [NFPA 54: 13.1.4] 

511.1.4 Sea level input ratings shall be used 
when determining maximum capacity for high- 
altitude installation. Actual input (derated for 
altitude) shall be used for determining minimum 
capacity for high-altitude installation. [NFPA 54: 
13.1.5] 

511.1.5 For appliances with more than one 
input rate, the minimum vent capacity (FAN 
Min) determined from the tables shall be less 
than the lowest appliance input rating, and the 
maximum vent capacity (FAN Max/NAT Max) 
determined from the tables shall be greater than 
the highest appliance rating input. [NFPA 54: 
13.1.6] 



511.1.6 Listed corrugated metallic chimney 
liner systems in masonry chimneys shall be 
sized by using Tables 5-8 or 5-9 for Type B vents 
with the maximum capacity reduced by 20 percent 
(0.80 maximum capacity) and the minimum 
capacity as shown in Tables 5-8 or 5-9. 
Corrugated metallic liner systems installed with 
bends or offsets shall have their maximum 
capacity further reduced in accordance with 
Section 511.1.2. The 20 percent reduction for 
corrugated metallic chimney liner systems 
includes an allowance for one long radius 90- 
degree turn at the bottom of the liner. [NFPA 54: 
13.1.7] 

511.1.7 Where the vertical vent has a larger 
diameter than the vent connector, the vertical 
vent diameter shall be used to determine the 
minimum vent capacity, and the connector 
diameter shall be used to determine the 
maximum vent capacity. The flow. area of the 
vertical vent shall not exceed seven times the 
flow area of the listed appliance categorized vent 
area, flue collar area, or draft hood outlet area 
unless designed in accordance with approved 
engineering methods. [NFPA 54: 13.1.9] 

511.1.8 Connection to Chimney Liners. Connec- 
tions between chimney liners and listed double- 
wall connectors shaU be made with listed adapters 
designed for such purposes. [NFPA 54: 13.1.8] 

511.1.9 Vertical Vent Upsizing 7 x Rule. Where 
the vertical vent has a larger diameter than the 
vent connector, the vertical vent diameter shall be 
used to determine the minimum vent capacity, and 
the connector diameter shall be used to determine 
the maximum vent capacity. The flow area of the 
vertical vent shaU not exceed seven times the flow 
area of the listed appliance categorized vent area, 
flue collar area, or draft hood outlet area unless 
designed in accordance with approved engineering 
methods. [NFPA 54: 13.1.9] 

511.1.10 Draft Hood Conversion Accessories. 

Draft hood conversion accessories for use with 
masonry chin\neys venting listed Category I fan- 
assisted appliances shall be listed and installed in 
accordance with the listed accessory manu- 
facturers' installation instructions. [NFPA 54:13.1.10] 

511.1.11 Tables 5-8 through 5-12 shall be used 
for chimneys and vents not exposed to the 
outdoors below the roof line. A Type B vent or 
listed chimney lining system passing through an 
unused masonry chimney flue shall not be 
considered to be exposed to the outdoors. A 
Type B vent passing through an unventilated 
enclosure or chase insulated to a value of not 
less than R8 shall not be considered to be 
exposed to the outdoors. Table 5-10 in 



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63 



511.1 -511.2 



UNIFORM PLUMBING CODE 



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combination with Table 5-13 shall be 
used for clay-tile-lined exterior masonry 
chimneys, provided all of the following are met: 
[NFPA 54: 13.1.11] 

(1) The vent connector is Type B double wall. 

(2) The vent connector length is limited to 1-1/2 
feet for each inch (180 mm/mm) of vent 
cormector diameter. 

(3) The appliance is draft-hood-equipped. 

(4) The input rating is less than the maximum 
capacity given in Table 5-10. 

(5) For a water heater, the outdoor design 
temperature shall not be less than 5°F (15°C). 

(6) For a space-heating appliance, the input 
rating is greater than the minimum capacity 
given by Table 5-13. 

(7) Where the conditions of (1) through (6) 
cannot be met, an alternative venting design 
shall be used, such as a listed chimney 
lining system. 

Exception: Vents serving listed appliances 
installed in accordance with the appliance 
instructions and the terms of the listing. 

51 1.1.12 Corrugated vent connectors shall not be 
smaller than the listed appliance categorized 
vent diameter, flue collar diameter, or draft 
hood outlet diameter. [NFPA 54: 13.1.12] 

511.1.13 Vent connectors shall not be upsized 
more than two sizes greater than the listed 
appliance categorized vent diameter, flue collar 
diameter, or draft hood outlet diameter. [NFPA 
54: 13.1.13] 

511.1.14 In a single run of vent or vent 
connector, more than one diameter and type 
shall be permitted to be used, provided that all 
the sizes and types are permitted by the tables. 
[NFPA 54: 13.1.14] 

511.1.15 Interpolation shall be permitted in calcu- 
lating capacities for vent dimensions that fall 
between table entries. (See Part II-Example G.1.3.) 
[NFPA 54: 13.1.15] 

51 1 .1 .1 6 Extrapolation beyond the table entries 
shall not be permitted. [NFPA 54: 13.1.16] 

511.1.17 For vent heights lower than 6 feet and 
higher than shown in the tables, engineering 
methods shall be used to calculate vent capacities. 
[NFPA 54: 13.1.17] 

511.2 Additional Requirements to IVIultiple 
Appliance Vent Table 5-8 through Table 5-22. 

511.2.1 Obstructions and Vent Damper. 

These venting tables shall not be used where 
obstructions (see Section 510.15) are installed 
in the venting system. The installation of vents 
serving listed appliances with vent dampers 



shall be in accordance with the appliance 
manufacturers' instructions or in accordance 
with the following: [NFPA 54: 13.2.1] 

(1) The maximum capacity of the vent 
connector shall be determined using the 
NAT Max column. 

(2) The maximum capacity of the vertical vent 
or chimney shall be determined using the 
FAN + NAT column when the second 
appliance is a fan-assisted appliance, or the 
NAT + NAT column when the second 
appliance is equipped with a draft hood. 

(3) The minimum capacity shall be determined 
as if the appliance were a fan-assisted appliance. 

(a) The minimum capacity of the vent 
connector shall be determined using the 
FAN Min column. 

(b) The FAN + FAN column shall be used 
when the second appliance is a fan- 
assisted appliance, and the FAN + NAT 
column shall be used when the second 
appliance is equipped with a draft 
hood, to determine whether the vertical 
vent or chimney configuration is not 
permitted (NA). Where the vent 
configuration is NA, the vent configuration 
shall not be permitted and an alter- 
native venting configuration shall be 
utilized. 

51 1 .2.2 The maximum vent connector horizontal 
length shall be 18 in. /in. (180 mm/mm) of 
connector diameter as shown in Table 5-7. 
[NFPA 54: 13.2.2] 

51 1 .2.3 The vent connector shall be routed to 
the vent utilizing the shortest possible route. 
Connectors with longer horizontal lengths than 
those listed in Table b-7 are permitted under the 
following conditions: [NFPA 54: 13.2.3] 

(A) The maximum capacity (FAN Max or NAT 
Max) of the vent connector shall be reduced 
10 percent for each additional multiple of 
the length listed in Table ^-7 . For example, 
the maximum length listed for a 4-inches 
(100mm) connector is 6 feet (1.8 m). With a 
connector length greater than 6 feet (1.8 m) but 
not exceeding 12 feet (3.7 m), the maximum 
capacity must be reduced by 10 percent 
(0.90 maximum vent connector capacity). 
With a connector length greater than 12 feet 
(3.7 m) but not exceeding 18 feet (5.5 m), the 
maximum capacity must be reduced by 20 
percent (0.80 niaximum vent capacity). 

(B) For a connector serving a fan-assisted 
appliance, the minimum capacity (FAN 
Min) of the connector shall be determined 
by referring to the corresponding single 



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64 



WATER HEATERS 



511.2 



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appliance table. For Type B double-wall 
connectors. Table 5-8 shall be used. For 
single-wall connectors. Table 5-9 shall be 
used. The height (H) and lateral (L) shall be 
measured according to the procedures for a 
single appliance vent, as if the other 
appliances were not present. 

TABLE 5-7 

Vent Connector Maximum Length 

[NFPA 54: Table 13.2.2] 



Connector Diameter 
IVIaximum (in.) 



Connector Horizontal 
Length (ft.) 



5 

6 

7 

8 

9 

10 

12 

14 

16 

18 

20 

22 

24 



4-1/2 

6 

7-1/2 

9 

10-1/2 

12 

13-1/2 

15 

18 

21 

24 

27 

30 

33 

36 



For SI units, 1 in. = 25.4 mm; 1 f t = 0.305 m. 
[NFPA 54: Table 13.2.2] 

511.2.4 Where the vent connectors are 
combined prior to entering the vertical portion 
of the common vent to form a common vent 
manifold, the size of the common vent 
manifold and the common vent shall be 
determined by applying a 10 percent reduction 
(.90 X maximum common vent capacity) to the 
Common Vent Capacity part of the common 
vent tables. The length of the common vent 
connector manifold (LM) shall not exceed 18 
in. /in. (180 mm/mm) of common vent 
connector manifold diameter (D). (See Part II- 
Figure G.l(k).) [NFPA 54: 13.2.4] 

511.2.5 Where the common vertical vent is 
offset, the maximum capacity of the common 
vent shall be reduced in accordance with Section 
511.2.6, and the horizontal length of the common 
vent offset shall not exceed 18 in. /in. (180 
mm/mm) of common vent diameter. [NFPA 54: 
13.2.5] 



51 1 .2.6 For each elbow up to and including 45 
degrees in the common vent, the maximum 
common vent capacity listed in the venting 
tables shall be reduced by 5 percent. For 
each elbow greater than 45 degrees up to and 
including 90 degrees, the maximum common 
vent capacity listed in the venting tables shall be 
reduced by 10 percent. [NFPA 54: 13.2.6] 

511.2.7 The vent connector capacities listed 
in the common vent sizing tables include 
allowance for two 90-degree elbows. For each 
additional elbow up to and including 45 
degrees, the maximum vent connector 
capacity listed in the venting tables shall be 
reduced by 5 percent. For each elbow greater 
than 45 degrees up to and including 90 
degrees, the maximum vent connector 
capacity listed in the venting tables shall be 
reduced by 10 percent. [NFPA 54: 13.2.7] 

511.2.8 Common Vent Minimum Size. The 

cross-sectional area of the common vent shall be 
equal to or greater than the cross-sectional area 
of the largest connector. [NFPA 54: 13.2.8] 

511.2.9 Tee and Wye Fittings. Tee and wye 

fittings connected to a common vent shall be 
considered as part of the common vent and 
constructed of materials consistent with that of 
the common vent. [NFPA 54: 13.2.9] 

511.2.10 At the point where tee or wye fittings 
connect to a common vent, the opening size of 
the fitting shall be equal to the size of the 
common vent. Such fittings shall not be 
prohibited from having reduced size openings at 
the point of connection of appliance vent 
connectors. [NFPA 54: 13.2.10] 

511.2.11 Sea level input ratings shall be used 
when determining maximum capacity for high- 
altitude installation. Actual input (derated for 
altitude) shall be used for determining minimum 
capacity for high-altitude installation. [NFPA 54: 
13.2.11] 

511.2.12 The connector rise (R) for each 
appliance connector shall be measured from the 
draft hood outlet or flue collar to the centerline 
where the vent gas streams come together. 
[NFPA 54: 13.2.12] 

511.2.13 For multiple units of gas utilization 
equipment all located on one floor, available 
total height (H) shall be measured from the 
highest draft hood outlet or flue collar up to the 
level of the outlet of the common vent. [NFPA 
54: 13.2.13] 

511.2.14 For multistory instcillations, available 
total height (H) for each segment of the system 



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65 



511 .2 -Figure 5-7 



UNIFORM PLUMBING CODE 



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shall be the vertical distance between the highest 
draft hood outlet or flue collar entering that 
segment and the centerline of the next higher 
interconnection tee. (See Part Il-Figure G.l(j).) 
[NFPA 54: 13.2.14] 

511.2.15 The size of the lowest connector and 
of the vertical vent leading to the lowest 
interconnection of a multistory system shall be 
in accordance with Tables 5-8 or 5-9 for available 
total height (H) up to the lowest interconnection. 
(See Part II-Figure G.l(n).) [NFPA 54: 13.2.15] 

511.2.16 Where used in multistory systems, 
vertical common vents shall be Type B double- 
wall and shall be installed with a listed vent cap. 
[NFPA 54: 13.2.16] 

511.2.17 Offsets in multistory common vent 
systems shall be limited to a single offset in each 
system, and systems with an offset shall comply 
with all of the following: [NFPA 54: 13.2.17] 

(1) The offset angle shall not exceed 45 degrees 
from vertical. 

(2) The horizontal length of the offset shall not 
exceed 18 inches for each inch (180 mm/mm) 
of common vent diameter of the segment in 
which the offset is located. 

(3) For the segment of the common vertical vent 
containing the offset, the common vent 
capacity listed in the common venting tables 
shall be reduced by 20 percent (0.80 x maximum 
common vent capacity). 

(4) A multistory comrnon vent shall not be 
reduced in size above the offset. 

511.2.18 Where two or more appliances are 
connected to a vertical vent or chimney, the flow 
area of the largest section of vertical vent or 
chimney shall not exceed seven times the 
smallest listed appliance categorized vent areas, 
flue collar area, or draft hood outlet area unless 
designed in accordance with approved 
engineering methods. [NFPA 54: 13.2.18] 

511.2.19 For appliances with more than one 
input rate, the minimum vent connector capacity 
(FAN Min) determined from the tables shall be 
less than the lowest appliance input rating, and 
the maximum vent connector capacity (FAN Max 
or NAT Max) determined from the table shall be 
greater than the highest appliance input rating. 

[NFPA 54: 13.2.19] 

511.2.20 Listed corrugated metallic chimney 
liner systems in masonry chimneys shall be 
sized by using Tables 5-14 or 5-15 for Type B 
vents, with the maximum capacity reduced by 
20 percent (0.80 maximum capacity) and the 



minimum capacity as shown in Tables 5-14 or 
5-15. Corrugated nietallic liner systems installed 
with bends or offsets shall have their maximum 
capacity further reduced in accordance with 
Sections 511.2.5 and 511.2.6. The 20 percent 
reduction for corrugated metallic chimney liner 
systems includes an allowance for one long 
radius 90-degree turn at the bottom of the liner. 
[NFPA 54: 13.2.20] 

511.2.21 Tables 5-14 and 5-15 shall be used for 
chimneys and vents not exposed to the outdoors 
below the roof line. A Type B vent passing 
through an unventilated enclosure or chase 
insulated to a value of not less than R8 shall not 
be considered to be exposed to the outdoors. 
Tables 5-19 and 5-20 shall be used for clay-tile- 
lined exterior masonry chimneys, provided all of 
the following conditions are met: [NFPA 54: 
13.2.23] 

(1) Vent cormector is Type B double-wall. 

(2) At least one appliance is draft-hood- 
equipped. 

(3) The combined appliance input rating is less 
than the maximum capacity given by Table 
5-19 (for NAT + NAT) or Table 5-21 (for 

FAN + NAT). 

(4) The input rating of each space-heating 
appliance is greater than the minimum 
input rating given by Table 5-20 (for 
NAT + NAT) or Table 5-21 (for FAN + NAT). 



Chimney or gas vent 




_...,. 




1 1 '1 r 1 I 1 1 


1 


1 1 t ( ' 1 " 1 ' 1 ' t ' I 


JL....1 


1 1 1 t 1 i 1 1 


,,! 1 - - 



FIGURE 5-7 All Combustion Air from Indoor 
Spaces through Indoor Combustion Air 
Openings. [NFPA 54: Figure A.9.3.2.3(1)] 



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66 



WATER HEATERS 



511.2-512.0 



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(5) The vent connector sizing is in accordance 
with Table 5-16. 

(6) Where these conditions cannot be met, an 
alternative venting design shall be used, 
such as a listed chimney lining system. 

Exception: Vents serving listed appliances 
installed in accordance with the appliance 
manufacturers' installation instructions. 

51 1 .2.22 Vent connectors shall not be increased 
more than two sizes greater than the listed 
appliance categorized vent diameter, flue collar 
diameter, or draft hood outlet diameter. Vent 
connectors for draft-hood-equipped appliances 
shall not be smaller than the draft hood outlet 
diameter. Where vent cormector sizes determined 
from the tables for fan-assisted appliances are 
smaller than the flue collar diameter, the use of 
the smaller sizes shall be permitted provided 
that the installation complies with all of the 
following conditions: [NFPA 54: 13.2.24] 

(1) Vent connectors for fan-assisted appliance 
flue collars 12 inches (300 mm) in diameter 
or smaller are not reduced by more than one 
table size [e.g., 12 inches to 10 in. (300 mm to 
250 mm) is a one-size reduction] and those 
larger than 12 inches (300 mm) in diameter 
are not reduced more than two table sizes 
[e.g., 24 inch to 20 inch (610 mm to 510 mm) 
is a two-size reduction]. 

(2) Fan-assisted appliances are common vented 
with a draft-hood-equipped appliance. 

(3) The vent connector has a smooth interior 
wall. 

511.2.23 All combinations of pipe sizes, 
single-wall, and double-wall metal pipe shall 
be allowed within any connector run or 
within the common vent, provided ALL of 
the appropriate tables permit ALL of the 
desired sizes and types of pipe, as if they 
were used for the entire length of the subject 
connector or vent. Where single-wall and 
Type B double-wall metal pipes are used for 
vent connectors within the same venting 
system, the common vent must be sized 
using Tables 5-15 or 5-17 as appropriate. 
[NFPA 54: 13.2.25] 

511.2.24 Where a table permits more than one 
diameter of pipe to be used for a connector or 
vent, all the permitted sizes shall be permitted to 
be used. [NFPA 54: 13.2.26] 

511.2.25 Interpolation shall be permitted in 
calculating capacities for vent dimensions that 
faU between table entries. (See Part U Annex G.1.3.) 
[NFPA 54: 13.2.27] 

511.2.26 Extrapolation beyond the table 
entries shall not be permitted. [NFPA 54: 13.2.28] 



51 1 .2.27 For vent heights lower than 6 feet and 
higher than shown in the tables, engineering 
methods shall be used to calculate vent capacities. 
[NFPA 54: 13.2.28] 

512.0 Direct- Vent Equipment. Listed direct-vent 
gas utilization equipment shall be considered 
properly vented where installed in accordance with 
the terms of its listing, the manufacturers' 
instructions, and Section 510.8.3. [NFPA 54: 12.3.5] 



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67 



Figure 5-8 ~ Figure 5-1 1 



UNIFORIVI PLUMBING CODE 



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Chimney or ga$ vent 



Ventilation touvers 
(each end of attte) 



Alternate 
air iniet 




Chimney or gas vent 






Ventilation iouvers for 
unheated crawl space 



FIGURE 5-8 All Combustion Air from Outdoors - 
Inlet Air from Ventilated Crawl Space and Outlet 
Air to Ventilated Attic. [NFPA 54: Figure 
A.9.3.3.1(1)(a)] 



Chimney or ps vent 



Ventilation louvers 
(each end of attic) 





FIGURE 5-10 All Combustion Air from Outdoors 
through Horizontal Ducts. [NFPA 54: Figure 
A.9.3.3.1(2)] 



Chimney or gas vent 



inlet air diK^ 
[er«te 1ft (300 iron) 
aljove flcwr] 



m 



I ■ I , I ■ I . I ,1=1 



FIGURE 5-9 All Combustion Air from Outdoors 
through Ventilated Attic. [NFPA 54: Figure 
A.9.3.3.1(1)(b)] 




Opening 

Alternate 
opening 
location 



FIGURE 5-1 1 All Combustion Air from Outdoors 
through Single Combustion Air Opening. 
[NFPA 54: Figure A.9.3.3.2] 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



68 



WATER HEATERS 



Figure 5-12 - Figure 5-13 



Mechanical 
draft \^nt 
terminal 
(see 5iaai) 




Forced air 
iniet 



Direct vent terminal cleararK^ 
Minimum clearance, C 
Input (Btu/hr) CleargwYce (In.) 

10.000 or less 

10.001 to 50,000 9 
Over 50,000 12 
(see 10.8.3) 

For SI units: 1 ft = 0.305 m; 1 in. « 25.4 mm; 
1 Btu/hr == 0.293 W 

FIGURE 5-12 Exit Terminals of Mechanical Draft and Direct- Vent Venting Systems. [NFPA 54: Figure A.12.91 




(TC) 



99% Winter Design Temperatures for the Contiguous United States 

This map is a necessarily generalized guide to temperatures in the contiguous United States. Temperatures shown for areas 
such as mountainous regions and large urban centers may not be accurate. The data used to develop this map are from the 
1 993 ASHRAE Handbook — Fundamentals (Chapter 24, Table 1 : Climate Conditions for the United States). 
For 99% winter design temperatures in Alaska, consult the ASHRAE Handbook — Fundamentals. 
99% winter design temperatures for Hawaii are greater than 37°F. 

FIGURE 5-13 Range of Winter Design Temperatures Used in Analyzing Exterior Masonry Chimneys in 
the United States. [NFPA 54:Figure G.2.4] 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA' 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



69 



Table 5-8 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 5-8 Type B Double-Wall Gas Vent 





Lateral 
L 

(ft) 




















Number of Appliances: 


Single 




Appliance Type: 


Category I 




Appliimtxv Vent Connection: 


Connected Dirertly to Vent 






















Vent Diameter - 


-/>(m.) 
















3 


^ 


5 


^1 


7 


8 


9 


















Appliance Input Rating 


m Tliousiinds of Btu per Hour 












H 

m 


FAN 


NAT 
Mas 


FAN 


NAT 
Max 


FAN 


NAT 
Max 


FAN 


; 


NAT 
Max 


FAN , NAT 


FAN 


NAT 
Max' 


FAN 


■NAT- 


Min 


Max 


Min 


Max 


Min 


Max 


Min 


Max ' 


Min Max Max 


Min Nia.x 


Min 


Max 


Mas 


f> 








78 


46 





152 


m 





251 


.141 





375 ' 


205 


524 2a3 


698 , 


' 370 





897 ■ 


■ 470 




2 


13 


51 


;^6 


18 


97 ■ 


m 


27 


157 


!»»5 


32 


232 


157 


44 321 2(7 


53 425 


285 


63 


543 


-.370 




4 


21 


19 


;!4 


SO 


91 


64 


39 


153 


103 


30 


227 


'153 


66 316 21 1 


79 419 


279 


93 


5,36 


!562 




6 


25 


4(i 


32 


36 


9} 


61 


47 


149 


iO<! 


59 


223 


119, 


78 310 205 


93 413 


273 


110 


530 


,,854 


8 








84 


50 





Ho 


»4 





27(i 


155 





415 . 


^ 235 


583 - 320 


780 


415 





10«0 


' 537 




2 


12 


57 


40 


16 


109 


75 


25 


178 


120 


28 


263 


ISO 


42 365 247' 


50 483 


■ .322, 


00 


619 


4!8 




5 


23 


53 


m 


32 


103 


71 


42 


171 


115 


53 


253 


173 


70 356 237 


S3 473 


313 


99 


607 


407 




8 


28 


49 


■ 35 


39 


98 


66 


51 


164 


109 


64 


247 


163 


84 347 227 


99 463 


• 303 


117 


596 


, "3^ 


!0 








88 


53 





175 


100 





295 


. 166 





447 


253 


031 345 


847 ; 


. 450 





1090 


- 585 




2 


12 


01 


42 


17 


118 


81- 


23 


194 


129 


26 


289 


195 


40 462 273 


48 533 


S.55 


57 


684 


4S7 




5 


23 


57 


40 


32 


N3 


77 


41 


187 


124 


52 


280 , 


188 


68 392 263 


SI ,322 


'fm 


93 


671 


446 




10 


30 


51 


3() 


41 


104 


70 


54 


176 


115 


67 


267 


175 


88 376 245 


104 ,504 • 


, 330 


122 


651 


427 


15 


« 





<.t4 


58 





19i 


H2 





327 


187 





502 


ate 


716 390 


970 


. .525 





1263 


(582 




2 


11 


f)0 


. 48 


15 


1,36 


■ 93 


20 


220 


150 


22 


,339 


223 


38 475 316 


43 6,33 


414 


53 


815 


544 




5 


22 


05 


43 


30 


130 


87 


39 


219 


142 


49 


330 , 


217 


64 463 300 


76 620 


403 


90 


800 ■ 


529 




!0 


29 


59 


41 


40 


121 


82 


51 


206 


1» 


64 


315 


im 


84 445 288 


99 600 


386 


116 


777 


507 




15 


35 


53 


37 


48 


112 


76 


61 


195 


_ 128 


76 


301 


198 


98 429 275 


115 580 


373 


134 


7.55 


4»1 


20 








97 


61 





202 


119 





349 


202 





540 


~ , -.307 


776 4S0 


1057 


' 575 





13S4 


'732 




2 


10 


75 


51 


14 


H9 


■ 10O 


18 


250 


166 


20 


377 


249 


33 531 346 


41 711 


470 


50 


917 ■ 


612 




f) 


21 


71 


48 


29 


143 


96 


38 


242 


liKI 


47 


367 


241 


62 519 337 


73 697 


460 


86 


902 


599 




10 


28 


04 


44 


38 


133 


89 


50 


229 


150 


62 


351 


22H 


SI 499 321 


95 675 


• 44.3 


112 


877 


576 




},'> 


34 


58 


4ft 


4!) 


124 


,84 


59 


217 


142 


73 


337 ■■ 


217 


94 481 aitH 


111 0,54, 


■ -427 


129 


853 


557 




20 


48 


52 


35 


55 


no 


78 


69 


200 


134 


84 


322 


206 


107 464 295 


125 634 


■410 


143 


830 


537 


30 








100 


m 





213 


128 





374 


220 





587 


. 336 


853 475 


1173' 


650 





1548 ■ 


855 




2 


9 


81 


56 


13 


166 


112 


14 


283 


185 


18 


432 


280 


27 613 .394 


33 826 


:533 


42 


1072 • 


im 




5 


21 


77 


54' 


28 


160 


108 


36 


273 


176 


45 


421 


273 


38 60O 385 


69 81 1 


,524 


82 


10.55 


' ik^ 




10 


27 


70 


f.O 


37 


150 


102 


48 


202 


171 


59 


405 


261 


77 580 37 t 


91 788 


507 


107 


1028 


6!)8 




ir> 


33 


f.4 


NA 


44 


141 


m 


57 


249 


163 


70 


389 


,249 


90 560 357 


103 763 


• ,490 


124 


1002 


648 




20 


36 


58 


NA 


53 


132 


90 


66 


237 


154 


80 


374 


237 


102 542 343 


119 743 


473 


139 


977 


6SS 




30 


NA 


NA 


NA 


73 


113 


NA 


88 


214 


NA 


104 


346 


219 


131 .507 321 


149 792 


, -144 


171 


929 


5*1 


50 








101 


07 





216 


134 





397 


932 





633 , 


3(13 


932 518 


1297 


.708 





1730 


952 




2 


8 


80 


61 


1,1 


183 


122 


14 


320 


206 


15 


497 


314 


22 715 445 


26 975 , 


615 


33 


1276 ■ 


813 




5 


20 


82 


■ NA 


27 


177 


no 


35 


312 


200 


43 


487 


308 


53 702 ■ , 438 


05 960 


MJ5 


77 


1239 


798 




10 


26 


70 


NA 


35 


1(>8 


114 


43 


299 


■ 190 


56 


471 


298 


7.3 681 - 426 


86 9.!5 


.589 


101 


12,30 


773 




15 


59 


70 


NA 


42 


158 


NA 


54 


287 


.180 


66 


455 ■ 


, ass 


83 662 413 


100 911 


.572 


117 


1203 


747 




20 


NA 


NA 


NA 


m 


149 


NA 


63 


275 


169 


76 


440 


278 


97 042 .401' 


113 888 


356 


131 


1176 


■ 722 




30 


NA 


KA 


NA 


m 


13! 


NA- 


84 


250 


,NA 


99 


410 


259 


123 605 376 


141 84-1 


'mi 


161 


112.5 


670 


IW) 





NA 


NA 


NA 





218 


NA 





407 


,NA 





663 ■ 


400 


997 . 560 


1411 


770 





1998 


MHO 




2 


NA 


NA 


NA 


10 


194 


NA 


12 


334 


NA 


13 


StWi 


375' 


18 831 510 


21 1 1 55 


• 700 


23 


1536 , 


mh 




5 


NA 


NA 


NA 


26 


189 


NA 


33 


347 


. NA 


40 


557 


%m 


52 820 504 


00 IMl 


692 


71 


1319 


926 




10 


NA 


NA 


NA 


S3 


182 


NA 


43 


335 


NA 


53 


542 


36! 


68 801 49.3 


80 1118 


* 079 


94 


1492 


910 




15 


NA 


NA 


NA 


40 


174 


NA 


50 


321 


NA 


62 


528 


333 


80 782 ■ 4«2 


93 1093 


«i6 


109 


1463 


R93 




20 


NA 


NA 


NA 


47 


lOti 


NA 


59 


311 


NA 


71 


513 


344 


90 763 471 


103 1073 


• 6.3:4 


122 


i4;{8 


880 




30 


NA 


NA 


NA 


NA 


NA 


NA 


78 


290 


NA 


92 


483 


NA 


115 726 449 


131 1029 


627 


149 


1387 


849 




50 


NA 


NA 


NA 


NA 


NA 


NA, 


NA 


NA 


. NA 


147 


428 


NA 


180 051 '405 


197 944 


,375 


217 


1288 


787 



[NlTA54Tablel,3.1<;i)l 



70 



WATER HEATERS 



Table 5-8 continued 



Table 5-8 continued 





















Number of Appliances: 


SingI 


e 


















Appliance 


T)pe: 


Category I 




Appliance Vent Connection: 


Connected Directly to Vent 




Vent Diameter — X) (in. ) 




10 


12 


14 


U 


18 


_ «« , 


22 


u 


















Appliance Input Rating in 


Thousands of Bt» per Hour 












Height Lateral 


FAN 


NAT 
Max 


FAN NAT 


FAN 


NAT 

Max 


VAH 


NAT 
Max 


FAN 


NAT 
JMbx 


Fj«J 


NAT 
Max 


FAN NAT 


F.AN NAT 


(ft) (ft) 


Min 


Max 


Min 


Max Max 


Min 


Max 


Min 


Max 


Min 


Max 


Miti 


Max 


Min Max Max 


Min 


Max Max, 


e 





1121 


570 





1645 830 





2267 


1170 





2<)S3 


1.530 





3802 


1960 





4721 


243t» 


3737 29.^) 





6833 .3520 


2 


73 


f.75 


435 


103 


982 ■ Ofrf) 


!38 


I34<) 


890 


178 


1769 


liTW 


225 


2250 


148?) 


2<K» 


2782 


la30 


3W) .3377 Ti20 


426 


40.30 2670 


4 


110 


BtiH 


445 


147 


975 640 


191 


1338 


880 


242 


1761 


im> 


3(.K! 


2242 


147.3 


390 


2774 


1835 


4<;9 3370 2215 


.553 


4023 2660 


6 


128 


frfil 


435 


171 


967 630 


219 


1330 


»70 


276 


1733 


1150 


341 


2233 


1470 


437 


2767 


1820 


.323 3363 '2210 


618 


4017 26.30 


8 





1261 


660 





1858 970 





2371 


1320 





3399 


1740 





4333 


2220 





3.387 


2730 


6355 .3360 





7838 4010 


2 


71 


770 


513 


98 


1134 743 


130 


1543 


1020 


168 


20,30 


1340 


212 


2584 


1700 


278 


3196 


2110 


,336 .3882 2.360 


401 


4634 .3050 


3 


115 


75K 


503 


154 


1110 ,733 


199 


1528 


1010 


251 


2013 


1330 


311 


2.5((3 


1683 


.398 


3180 


2090 


476 .3863 2.345 


362 


4612 .3040 


8 


137 


740 


490 


180 


1097 720 


231 


1314 


.iO(H» 


289 


2000 


!320 


3.54 


23,52 


1670 


450 


3163 


2070 


337 .1830 ' 2330 


630 


1602 :«)30 


10 (> 





1377 


720 





2036 1060 





2825 


i 
:i450 





3742 


1923 





4782 


2430 





59.5.3 


30.30 


72.34 3710 





86.S2 44m) 


2 


m 


852 


560 


93 


1214 850 


124 


1713 


il3i! 


161 


2256 


HHO 


202 


2868 


1890 


264 


3536 


2340 


319 4322 284!> 


378 


5153 .3.390 


5 


112 


83U 


347 


149 


1229 829 


192 


1690 


1103 


243 


2238 


146! 


300 


2849 


187! 


382 


3336 


2S18 


4.58 4301 2818 


.340 


31.32 .3,371 


10 


J42 


817 


523 


187 


1204 795 


238 


1069 


wm 


298 


2209 


1430 


364 


2818 


18-10 


4.39 


.3.504 


2280 


546 4268 2780 


641 


.3099 ,3340 


15 





15<!{i 


840 





2380 1240 





3323 


\m 





4423 


2270 





5678 


2900 





709!;) 


.3620 


(» 8663 4410 





10„393 ,3.300 


2 


t)3 


lOiy 


B73 


86 


1495 985 


114 


2062 


i35ff 


147 


2719 


1770 


186 


3467 


'/am 


239 


4304 


2800 


290 5232 3410 


346 


6231 4080 


3 


103 


mi-i 


rni 


140 


1476 907 


182 


204! 


!327 


229 


2696 


!748 


283 


3442 


2235 


3.55 


427H 


2777 


426 5204 3385- 


501 


6222 4057 


10 


135 


977 


635 


177 


1446 936 


227 


2009 


1^9 


283 


26,59 


1712 


346 


3402 


2193 


432 


4234 


2739 


510 3159 ' 3343 


.599 


6175 4019 


13 


153 


y33 


010 


202 


1418 903 


237 


1976 


12S0 


318 


2623 


1675 


385 


.3,363 


2130 


479 


4192 


2700 


.364 5115 '3300 


665 


6129 3980 


20 





1730 


«30 





2637 1350 





3701 


1900 





4948 


2520 





6.376 


mm 





7988 


4060 


9785 4980 





11,733 6000 


2 


59 


1150 


753 


81 


1694 1100 


107 


2343 


!520 


139 


3097 


2«i0 


173 


39.35 


2.370 


220 


4916 


3200 


269 .3983 3910 


321 


71.34 4700 


-> 


101 


1 133 


738 


135 


1674 1079 


174 


2320 


1498 


219 


;i071 


1978 


270 


3926 


2344 


.337 


4883 


.3174 


403 .39.50 3880 


475 


7119 4662 


10 


KM 


1 105 


710 


172 


HHl 1045 


220 


2282 


1460 


273 


,3029 


1940 


334 


3880 


23m) 


113 


4835 


3!S0 


189 5896 38.30 


573 


7063 4000 


15 


150 


1078 


fi88 


195 


1(509 1018 


248 


2243 


.1425 


306 


2',)88 


1910 


372 


3835 


2463 


4.39 


4781) 


Mm 


34! .384! ,3795 


631 


7007 437.3 


20 


167 


1032 


OKi 


217 


1578 990 


273 


2210 


.1390 


335 


2948 


!880 


404 


3791 


24,30 


495 


4737 


.10,50 


.385 5792 .3760 


689 


69,33 4rm 


30 





1977 


itKifl 





3004 4530 





4Z52 


2170 





5725 


2920 





7420 


.3770 





9341 


47.30 


11,483 mm 





1,3,848 ' 7060 


2 


54 


135! 


865 


74 


2004 !3iO 


98 


2786 


1800 


127 


3696 


2380 


1.59 


4734 


3030 


199 


.3900 


.3810 


211 7194 46.30 


283 


8617 .3600 


5 


90 


1332 


851 


127 


1981 J289 


161 


2759 


!775 


206 


36(ir, 


2350 


252 


4701 


3020 


312 


3863 


.3783 


373 7155 .1622 


439 


8574 5532 


10 


123 


1301 


829 


164 


UM4 1234 


209 


2716 


1733 


239 


3617 


2300 


316 


4647 


2970 


38{) 


.5803 


,3739, 


456 7m)0 4.374 


335 


8.505 .3471 


15 


143 


1272 


mi 


187 


1(M)S 1220 


237 


2674 


i<i92 


292 


3570 


22r>(» 


354 


4594 


2920 


431 


5744 


.3693 ■ 


.307 7026 4327 


.390 


8437 ,3391 


20 


ffiO 


1243 


784 


207 


1873 1185 


260 


2633 


1630 


319 


3523 


22(Mi 


384 


4542 


2«70 


467 


.3686 


.3a30 


.348 6964 4480 


639 


8370 .3310 


30 


195 


1189 


745 


246 


1807 1130 


:»)5 


2535 


ISHS 


369 


3433 


2130 


440 


4442 


2783 


540 


.3574 


.3.365 


635 6842 4375 


7,39 


8239 .322,3 


50 , 





2231 


1195 





3141 1823 





4934 


'2350 





671 1 


31440 





8774 


4460 


1 


1.129 


363.3 


13,767 6940 





16.694 8430 


2 


41 


1{)20 


!01U 


66 


2431 1513 


86 


3409 


2123 


113 


4351 


2840 


141 


.5864 


S670 


171 


7339 


4i>m 


209 8980 3695 


251 


10,788 68C0 


■ f> 


<J0 


1600 


95M) 


118 


2406 1495 


131 


3380 


2102 


191 


4520 


2813 


234 


582() 


3689 


283 


7295 


4597 


3.36 8933 36.34 


394 


10,737 f 6818 


10 


UH 


1307 


972 


154 


2366 (4f>6 


196 


3332 


2064 


243 


4464 


2767 


295 


.5763 


3,383 


335 


7224 


4342 


419 8853 . ,5585 


491 


10.6.32 6749 


15 


136 


1536 


948 


177 


2327 1437 


222 


3285 


2026 


274 


4409 


2721 


3.30 


3701 


3534 


396 


7155 


4511 


465 8779 5.546' 


.342 


10,570 6710 


20 


15! 


1303 


924 


195 


2288 1408 


244 


3239 


i987 


300 


43,16 


2675 


361 


5641 


3481 


433 


7086 


4479 


506 870-1 , 5506 


.386 


10,488 6670 


30 


183 


1446 


876 


232 


2214 1349 


287 


3150 


,1910 


,347 


4253 


26SI 


412 


.5523 


3431 


494 


0953 


4421 


377 8357 S444 


672 


10,328 6603 


100 





249! 


1310 





3925 2030 





r.729 


wm 





7914 


4030 





10.483 


5860 


13,454 


6700 


016,817 8600' 





i 
20,578 10,300, 


2 


30 


1973 


1170 


44 


3027 1820 


72 


4313 


2550 


93 


5834 


SalM! 


120 


7391 


4600 


1.38 


9377 


.3H<m 


169 1 1.803 7af» 


204 


14,261 88(M) 


5 


82 


1955 


1159 


107 


■mn 1803 


136 


4282 


233! 


172 


5797 


3475 


208 


75 !8 


4.366 


245 


9.328 


.5769 


293 11,748 7162 


341 


14,204 87.36 


10 


108 


lyj:, 


1142 


142 


2961 .i775 


180 


423! 


tm) 


223 


5737 


3434 


2(i8 


7478 


4.309 


318 


9147 


.5717 


374 11.6.38 7100 


436 


14,103 8683 


15 


126 


1892 


1124 


163 


2920 1747 


206 


4182 


2469 


252 


3678 


3392 


304 


7409 


4451 


3.38 


9367 


r>66,3 


4 18 11, .369 70.37 


487 


11,007 • 8610, 


20 


MJ 


1861 


1107 


181 


2880 Ills 


226 


4133 


2438 


277 


.56 i 9 


3951 


3.30 


7341 


4.394 


.387 


9289 


.5613 


4.52 11.4.32 6975 


523 


13,910 8537 


30 


170 


1802 


107! 


2!5 


280S 1663 


205 


4037 


2373 


319 


5505 


3267 


378 


7209 


4279 


446 


9136 


5Sf!9 


314 1 1.310 <«!IS« 


.392 


13,720 8391 


50 


241 


l<i8S 


iooo 


292 


2637 1950 


350 


3856 


2250 


4!3 


3289 


3!00 


486 


69.56 


40.% 


572 


8841 


.530(1 


6.39 10,979 mm 


752 


13,.»4 810(1 



For Sr miit-s, 1 in. = 25.4 mm, 1 ft = 0.30.5 in, 1000 Blii/hr- = 0.293 kW^ 1 iii.'-^ = 64.5 mnr. 
[NFPA 54 Table 13.1(a)] 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



71 



Table 5-9 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 5-9 Type B Double-WaU Vent 





Lateral 
I 

(ft) 


























Niniiber of 


Appliances: 


SingI 


e 






















AppI 


lancc Type: 


Category I 








Appliance Vent Connci 


(ion: 


SingI 


eWall Metal Connector 






























Veni Diameter 


-Dim.) 






















3 


4 


S 


6 


7 


8 


9 


ID 


12 






















Appliance Input Rating in ITjoiisands of Btu per 


Hour 
















Height 
H 

(ft) 


FAN 


HAT 

.Max 


FAN 


NAT' 
Max' 


FAN 


NAT 
Mas 


FAN NAT_ 


FAN 


NAT~ 
Msix- 


FAN 


NAT 
Max 


FAN 


NAT 
Max 


FAN 


NAT- 
Max 


FAN 


NAT 


Urn 


Max 


Min 


Max 


Min 


Max 


MhJ 


Max Max 


Mill 


Max 


Min 


Max 


Min 


Max 


Min 


Max 


Min 


Max 


-Maxj 


6 





38 


77 


: 45 


59 


151 


85 


85 


249 


HO 


126 


373 tm 


165 


522 


284 


211 


695 


369 


267 


894 


469 


,371 


i1l8 


369 


537 


1639 


849 




2 


39 


51 


36 


m 


90 


m 


85 


156 


'.94 


123 


231 136 


159 


.320 


213 


201 


423 


284 


251 


.541 


,3(58 


347 


673 


453 


498 


979 


648 




4 


NA 


NA 


33 


74 


92 


63 


102 


152 


102 


146 


225 152 


187 


313 


208 


237 


416 


277 


295 


533 


.360 


409 


664 


443 


584 


971 


6S8 




6 


NA 


NA 


31 


83 


89 


60 


114 


147 


m 


163 


220 148 


207 


307 


203 


263 


409 


271 


327 


526 


352 


449 


656 


433 


638 


962 


627 


8 





37 


8,3 


50 


58 


104 


93 


S3 


273 


1.54 


123 


412 ; 234 


IRl 


58(t 


Si9 


200 


777 


414 


258 


1002 


.536 


360 


!2.57 


658 


.521 


1852 


967 




% 


39 


56 


, m 


59 


i08 


75 


83 


J 70 


119 


121 


201 179 


155 


363 


2<W> 


197 


482 


,321 


246 


617 


417 


339 


768 


,513 


486 


1 120 


743 




5 


NA 


NA 


37 


77 


102 


m 


i07 


108 


114 


15! 


2,52 .171 


193 


3.52 


235 


24.5 


470 


sn 


305 


604 


4«4 


418 


754 


'300 


598 


1104 


790, 




8 


NA 


NA 


33 


yo 


95 


^ 


122 


Ifil 


107 


175 


243 163 


223 


.342 


225 


280 


4.58 


300 


344 


.591 


.392 


470 


740 


486 


665 


1089 


715 


]0 





37 


S7 


53 


57 


174 


m 


82 


293 


165 


120 


444 254 


158 


628 


344 


202 


844 


449 


253 


1093 


.584 


351 


1373 


718 


r.07 


2031 


1057. 




2 


39 


01 


41 


59 


117 


m 


82 


193 


1S8 


119 


287 194, 


1.53 


400 


272 


193 


535 


.354 


242 


681 


4S6 


332 


849 


.559 


475 


1242 


848 




5 


52 


56 


■39 


7fi 


111 


70 


105 


185 


122 


148 


277 186 


190 


388 


201 


241 


518 


344 


299 


607 


443 


409 


834 


544 


,584 


1224 


825- 




10 


NA 


NA 


34 


97 


190 


08 


132 


171 


U2 


188 


261 ■ 171 


237 


309 


241 


290 


497 


.325 


363 


013 


423 


492 


808 


,.520 


088 


1194 


788 


\5 


() 


?* 


93 


57 


50 


190 


U'l 


80 


325 


186 


116 


499 2^3 


153 


713 


. 3RS 


195 


906 


.523 


244 


12.59 


681 


3.36 


1,591 


838 


488 


2374 


J237 




2 


3,S 


m 


47 


57 


130 


93 


8(t 


225 


1-19 


115 


337 224 


148 


■173 


3J4 


187 


631 


413 


232 


812 


.543 


319 


1015 


673 


4,57 


149! 


t«3 




5 


51 


03 


44 


75 


128 


80 


102 


210 


140 


144 


326 217 


182 


4,59 


298 


231 


016 


400 


287 


795 


526 


.392 


997 


657 


.562 


1469 


963 




10 


NA 


NA 


39 


95 


110 


79 


128 


201 


131 


182 


308 203 


228 


4;»i 


284 


284 


.592 


3S1 


349 


768 


301 


470 


906 


628 


664 


1433 


928 




15 


NA 


NA 


-NA 


NA 


NA 


72 


158 


180 


- 124 


220 


2U0 192 


272 


418 


269 


334 


.508 


367 


4rH 


712 


4«4 


540 


937 


601 


730 


1399 


894 


20 





35 


yfi 


60 


54 


200 


118 


"!< 


340 


20! 


114 


537 300 


149 


772 


428 


190 


10.53 


.573 


238 


1379 


7SI) 


326 


175! 


927 


473 


2631 


1,346' 




2 


37 


74 


59 


50 


118 


99 


78 


218 


,165 


113 


375 248 


114 


528 


344 


182 


708 


468 


227 


914 


6H 


,309 


1146 


754 


443 


1689 


1098 




5 


50 


OH 


,4" 


73 


140 


94 


100 


239 


158 


14! 


303 239 


178 


514 


334 


224 


092 


4r»- 


279 


896 


'■m 


381 


1126 


7,H4 


547 


I6C5 


1074' 




10 


NA 


NA 


41 


93 


129 


80 


125 


223 


HO 


177 


344 224 


222 


491 


316 


277 


606 


437 


339 


806 


370 


457 


1092 


702 


640 


1626 


1037 




15 


NA 


NA 


NA 


NA 


NA 


SO 


155 


208 


136 


216 


325 - 210 


264 


469 


301 


325 


04O 


419 


393 


838 


549 


.526 


!0(iO 


677 


730 


1587 


100.5 




20 


NA 


NA 


NA 


NA 


NA 


NA 


!K0 


192 


120 


2.54 


.306 196 


809 


448 


285 


374 


016 


400 


448 


810 


.526 


592 


1028 


6.51 


80S 


1.550 


973 


SO 





31 


m 


63 


53 


211 


la- 


76 


372 


2W 


110 


584 334 


144 


849 


472 


181 


1108 


647 


229 


1542 


8S2 


312 


1971 


1056 


4.54 


2996 


1345 




2 


37 


80 


56 


55 


104 


in 


70 


2Si 


183 


109 


429 279 


139 


010 


-392 


175 


823 


.533 


219 


1069 


698 


2lH) 


1346 


863 


424 


1999 


1.308 




5 


49 


74 


52 


72 


157 


HlO 


98 


271 


173 


136 


417 271 


171 


.595 


3«2 


215 


806 


,521 


269 


1049 


rm 


3fi6 


1324 


846 


,524 


1971 


1283 




10 


NA 


NA 


NA 


91 


144 


m 


122 


255 


108 


171 


397 257 


213 


570 


367 


265 


777 


.501 


327 


1017 


(«>2 


440 


1287 


821 


620 


1927 


1243' 




15 


NA 


NA 


NA 


1!5 


131 


NA 


151 


2.39 


■157 


20.S 


377 242 


2,55 


547 


349 


312 


750 


481 


379 


9.85 


638 


507 


1251 


794 


702 


1884 


,1205 




20 


NA 


NA 


NA 


NA 


NA 


NA 


181 


223 


NA 


246 


357 228 


298 


524 


333 


360 


723 


461- 


433 


955 


61.5 


570 


1216 


7(j8 


780 


1841 


1166 




30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


N.\ 


NA 


NA 


NA NA 


389 


477 


.303 


461 


070 


420 


.541 


895 


.574 


704 


1147 


730 


9.37 


1759 


llOi 


50 





33 


<») 


m 


51 


213 


133 


73 


394 


230 


105 


629 361 


138 


928 


5i'5 


176 


1292 


704 


220 


1724 


948 


295 


2223 


■1!«9 


428 


3432 


1818 




2 


»> 


S4 


in- 


53 


181 


12! 


73 


318 


203 


104 


495 312 


J 33 


712 


413 


108 


97J 


613 


209 


1273 


811 


280 


!615 


1007 


401 


2120 


IS09 




5 


48 


80 


NA 


70 


!74 


117 


9t 


308 


198 


131 


482 305 


104 


096 


435 


201 


9.53 


602 


257 


12.52 


Tfr. 


347 


1591 


991 


496 


2396 


1490 




10 


NA 


NA 


NA 


89 


iOO 


NA 


lis 


292 


■1R6 


102 


401 2S>2 


203 


071 


420 


2.53 


923 


r.83 


313 


1217 


765 


418 


1551 


963 


,589 


2347 


14.55 




15 


NA 


NA 


NA 


112 


I4H 


NA 


145 


275 


174 


199 


441 ' 281) 


244 


046 


. 403 


2<.)9 


894 


sr.2 


.363 


11. S3 


736 


48! 


1512 


934 


668 


2299 


1421 




20 


NA 


NA 


NA 


NA 


NA 


NA 


170 


257 


NA 


230 


420 - 267 


285 


622 


38«t 


.345 


806 


.543 


415 


11.50 


70,3 


544 


1473 


906 


741 


225! 


1387. 




.".0 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


315 


376 NA 


373 


573 


NA 


442 


809 


.502 


.521 


10,30 


649 


674 


1399 


848 


892 


2159 


J. 318 


KK) 





NA 


NA 


NA 


49 


2H 


NA 


00 


403 


,KA 


100 


(KiO 3<.}5 


131 


991 


'',.555 


166 


1401 


7fri 


207 


19<t0 


1033 


273 


2179 


1300 


395 


.3912 


2fM2 




2 


NA 


NA 


NA 


51 


192 


NA' 


70 


351 


NA 


98 


503 373 


125 


828 


'.508 


158 


11,52 


698 


196 


I5.'>2 


933 


259 


1970 


1168 


.371 


.302! 


1817 




5 


NA 


NA 


-NA 


67 


180 


NA 


90 


342 


NA- 


125 


.551 366 


1.50 


813 


£501 


194 


1134 


688 


240 


1,511 


921 


322 


1945 


1153 


4tHI 


2990 


1796 




10 


NA 


NA 


NA 


85 


175 


NA 


11.3 


324 


NA' 


153 


532 3.54 


191 


789 


:486- 


2.38 


1104 


672 


2'.)3 


1477 


902 


.389 


1905 


1533 


.547 


293S 


1763' 




15 


NA 


NA 


NA 


132 


102 


NA 


138 


310 


• NA 


188 


511 343 


230 


764 


;473 


281 


1075 


65ft 


342 


1443 


^4 


447 


1805 


1110 


618 


2888 


1730 




20 


NA 


NA 


NA 


NA 


NA 


NA 


108 


295 


NA 


224 


487 NA 


270 


7.39 


4.58 


323 


1046 


639 


.391 


1410 


864 


.507 


1825 


1087 


690 


2838 


inm 




SO 


NA 


NA 


NA 


NA 


NA 


NA 


231 


204 


•KA 


301 


448 NA 


3.55 


685 


. NA 


418 


988 


NA 


491 


1.143 


824 


031 


i747 


104! 


8.34 


2739 


1627 




50 


NA 


NA 


NA 


N\ 


NA 


NA 


NA 


iNA 


NA 


NA 


NA NA 


540 


584 


,NIA 


617 


806 


NA 


711 


1205 


NA 


895 


1591 


HA 


1138 


2547 


1489 



For SI unite, 1 in. = 25.4 mm, I ft = O.mh m, 1000 Btii/hr = 0.293 kW, 1 in.^ = 64.5 mm-. 
[NFPA 54 Table 13.1(b)} 



72 



WATER HEATERS 



Table 5-10 



Table 5-10 Masonry Chimney 

























Number of Appliaaces: 


SingI 


e 
























Appliance 


Type: 


Category I 




Appliance Vent Cotuicction: 


Typ« B Double-Wall Connector 






















Type B Double-WaU Comiector Diameter — D (in. ) 
















■^ight Lateral 
« i. 

ft) (ft) 


















To be u-scd with chimney atcm within tite size limits at bottom 
















3 


4 


5 


6 


7 


8 


9 


10 


12 






















AppI 


iance 


Input Rating 


in Thousands of Btu per 


Hotir 














H 


FAN 


NAT 


FAN 


MAT 
Max 


FAN 


NAT 
Max 


FAN 


HAT 
Max 


FAN NAT 


FAN 


NAT 
Ikfax 


FAN, 


NAT 
Max 


FAN 


NAT 
Max 


FAN 


NAT 




Min 


Max 


Min 


Max 


Miii 


Max 


Min 


Max 


Mill 


Max Max 


Min Max 


Min 


Max 


Min 


Max ' 


Min 


Max 


Max 


6 


a 


NA 


NA 


, » 


NA 


NA 


-,2 


NA 


NA 


m 


NA 


NA 


ISO 


NA 


NA lai' 


NA NA 


247 


NA 


NA 


320 


NA 


NA 


401 


NA 


N,\ 


.581 




') 


NA 


NA 


'3 


NA 


NA 


41» 


NA 


NA 


m 


NA 


NA 


117 


NA 


NA |f.5 


NA NA 


231 


NA 


NA 


298 


NA 


NA 


376 


NA 


.N.\ 


.56! 


8 


2 


NA 


NA 


29 


NA 


NA 


' 55 


NA 


N.\ 


t)9 


NA 


NA 


143 


N'A 


NA im 


N.\ NA 


•im 


84 


.590 


350 


100 


728 


44<> 


1.39 


1024 


651 




5 


NA 


NA 


26 


NA 


NA 


52 


NA 


NA 


8R 


NA 


NA 


i:i4 


NA 


NA 1S3 


NA NA 


247 


NA 


NA 


328 


140 


711 


423 


201 


1007 


640 




8 


NA 


NA 


24 


NA 


NA 


4H 


NA 


NA 


as 


NA 


NA 


127 


NA 


NA 175 


NA NA 


239 


NA 


NA 


318 


173 


«i95 


410 


231 


990 


623 


fO 


'2 


NA 


NA 


SI 


NA 


NA 


m 


NA 


NA 


H« 


NA 


NA 


1<»2 


NA 


NA 221 


(\S 5 to 


2»« 


82 


653 


38H 


98 


810 


491- 


136 


1144 


724 




:, 


NA 


NA 


as 


NA 


NA 


Tu 


NA 


N\ 


<«-> 


NA 


NA 


14S 


NA 


NA a04 


NA NA 


277 


12* 


638 


'Mih 


146 


791 


4<i0 


196 


1124 


712 




10 


NA 


NA 


*& 


NA 


NA 


50 


NA 


NA 


m 


•NA 


NA 


1S9 


NA 


NA 191 


NA NA 


263 


1.55 


610 


347 


182 


762 


444 


240 


1093 


668 


15 


2 


NA 


NA 


» 


NA 


NA 


m 


NA 


NA 


114 


NA 


NA 


17S» 


.')3 


475 2Bft 


M M'.S 


336 


77 


770 


441 


02 


9t>8 


,'562 


127 


1376 


,841 




3 


NA 


NA 


sr. 


NA 


NA 


62 


NA 


NA 


H!" 


NA 


NA 


l(>4 


NA 


NA 231 


y» 5y-i 


31,3 


118 


759 


416 


J 39 


916 . 


533 


186 


13.52 


828 




10 


NA 


NA 


28 


NA 


NA 


Tm 


NA 


NA 


07 


NA 


NA 


133 


NA 


NA I'lfi 


12fi .5(>5 


zm 


148 


727 


394 


173 


912 


.567 


229 


1315 


777 




i:. 


NA 


NA 


.NA 


NA 


NA 


4M 


NA 


NA 


m 


NA 


NA 


141 


NA 


NA 201 


NA NA 


281 


171 


6'J8 


375 


108 


880 


485 


2.59 


1280 


742 


20 


2 


NA 


NA 


m 


NA 


NA 


74 


NA 


NA 


124 


NA 


NA 


S«l 


:>i 


.522 274 


(il f.78 


375 


7,3 


867 


401 


87 


1083 ■ 


627 


121 


1548 


9.53 




.-J 


NA 


NA 


36 


NA 


NA 


• m 


NA 


NA 


116 


NA 


NA 


184 


80 


503 ,254 


93 658 


350 


113 


843 


463 


133 


10.59 


597 


179 


1523 


933 




iO 


NA 


NA 


NA 


NA 


NA 


60 


NA 


N.\ 


107 


NA 


NA 


172 


NA 


NA 237 


122 027 


332 


143 


8U 


440 


167 


1022 


, .560 


221 


1482 


• 879 




15 


NA 


NA 


■NA 


NA 


NA 


NA 


NA 


NA 


J1- 


NA 


NA 


ir>9 


NA 


NA 220 


NA NA 


314 


105 


780 


418 


191 


987 


.541 


25 1 


1443 


840 




20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


m 


NA 


NA 


\m 


NA 


N.\ 206 


NA NA 


2«» 


186 


750 


3517 


214 


955 


513 


277 


1406 


-807 


30 


2 


NA 


NA 


41 


NA 


NA 


82 


NA 


NA 


!37 


NA 


NA 


2ir» 


47 


581 ms 


57 762 


421 


68 


'085 


558 


81 


1240 


717 


111 


1793 


1112 




5 


NA 


NA 


NA 


NA 


NA 


76 


NA 


NA 


15>S 


NA 


NA 


im 


75 


561 281 


<K( 741 


:«■« 


106 


962 


526 


125 


1216 


683 


169 


1766 


1094 




iO 


NA 


NA 


NA 


NA 


NA 


67 


NA 


-NA 


115 


NA 


NA 


im 


NA 


NA 2Ba 


1 15 701.1 


a73 


135 


927 


5<J0 


158 


1176 


'6'18 


210 


1721 


1025 




15 


NA 


NA 


N.\ 


NA 


NA 


NA 


NA 


NA 


107 


NA 


NA 


171 


NA 


NA 243 


NA NA 


353 


156 


893 


47(i 


181 


11.39 


621 


239 


1679 


981 




20 


NA 


NA 


NA 


NA 


NA 


NA 


NA. 


NA 


yi 


NA 


NA 


}r»3 


"NA 


NA 227 


NA NA 


332 


176 


860 


450 


203 


1 103 


,592 


264 


1638 


940 




30 


NA 


NA 


NA 


KA 


NA 


NA 


NA 


N\ 


NA 


NA 


NA 


NA 


NA 


NA las 


NA NA 


3^ 


NA 


NA 


416 


249 


1035 


553 


318 


ISW) 


, 877 


30 


2 


NA 


NA 


NA 


NA 


NA 


92 


NA 


.NA 


lisi 


NA 


NA 


ZH 


NA 


NA ,3,51 


51 SIO 


477 


01 


1 100 


633 


72 


1413 


812 


99 


20.S0 


12<13 




,7 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


ir>t 


NA 


NA 


230 


NA 


NA 323 


83 819 


445 


as 


1083 


596 


110 


13H7 


774 


1.55 


2052 


JS25 




10 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


138 


NA 


NA 


at. 5 


NA 


NA :504 


NA NA 


424 


126 


1047 


567 


147 


1347 


733 


195 


20(M> 


1147 




15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


127 


NA 


NA 


IWJ 


NA 


NA 2S2 


N.\ NA 


WO 


146 


I0!0 


539 


170 


1307 


702 


222 


1961 


1099 




20 


NA 


NA 


N.A 


NA 


•NA 


NA. 


NA 


NA 


NA 


NA 


NA 


185 


NA 


NA 264 


NA NA 


376 


165 


977 


511 


190 


1269 


669 


246 


1916 


1050 




30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA NA 


NA NA 


327 


NA 


NA 


468 


233 


1 191) 


623 


295 


1832 


984 




Minimum 




12 






ly 






28 






m 






Mi 


63 






78 






95 






132 






internal 






















































area of 






















































chimney 

(in.^) ' 






















































Maximum 




49 






88 






l;17 






nw 






2r.<) 


332 






445 






5.'K) 






792 






internal 






















































area of 






















































chimnev 





















































For SI units, 1 in. = 2.5.4 mm, 1 ft = Q3Q') m, 1000 Btu/Iir = 0.293 kW, 1 in.*^ = 645 mm^. 
[NFPA 54 Table 13.1 (c)l 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



73 



Table 5-1 1 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 5-1 1 Masonry Chimney 

























Ninnber of Appliances: 


SingI 


e 
















Appliance Type: 


Category I 










Appliance 


Vent Connection: 


Single-Wall Metal Connector 
























Single-Wal 


Metal Connector Diameter — 1> (in.) 




















ight Lateral 
H L 




















To be used with chimney 


areas tfithin the mx limits at bottom 


















3 


4 


5 


6 


7 


8 


9 


10 


12 




Appliance Input Rating in TfaousancU of Btu per Hour 


H< 
















































(ft) <ft> 


FAN 


NAT 
Max 


PAN 


NAT 
Max- 


FAN 


NAT 


FAM NAT 


FAN NAT 


FAN NAT 


FAN NAT 


FAN 


NAT 


FAN 


NAT 




Min 


Max 


Min 


Max 


Min 


Max 


Min 


MaxJMax 


Min 


Max Mtat 


Min 


Max Max 


Min 


Max Max 


Mm 


Max 


Max 


Min 


Max 


Max 


6 


2 


NA 


NA 


28 


NA 


NA 


52 


NA 


NA 


86 


NA 


NA ; 130 


NA 


NA 180 


NA 


NA 247 


XA 


NA 319 


NA 


NA 


400 


NA 


NA 


580 




5 


NA 


NA 


25 


N,.\ 


NA 


48 


XA 


NA 


8i 


NA 


XA 116 


NA 


NA • 164 


NA 


NA ' 230 


NA 


NA 297 


NA 


XA 


375 


NA 


NA 


360 


8 


2 


NA 


NA 


29 


NA 


NA 


55 


NA 


NA 


93 


NA 


NA , 145 


NA 


NA 1»7 


NA 


NA 263 


NA 


NA 349 


382 


725 


, '445 


349 


1021 


630 




5 


NA 


NA 


*» 


NA 


NA 


5i 


NA 


NA 


87 


NA 


\A ; 133 


NA 


NA , 182 


NA 


NA 246 


NA 


NA 327 


NA 


NA 


•iTi 


673 


1(M)3 


■638 




8 


NA 


NA 


23 


NA 


NA 


47 


NA 


NA 


«2 


NA 


NA • 126 


NA 


NA ; 174 


NA 


NA 237 


XA 


NA 317 


NA 


NA 


408 


747 


985 


621' 


10 


2 


NA 


NA 


31 


NA 


NA 


61 


NA 


NA 


102 


NA 


XA 'i 16i 


NA 


NA 220 


210 


518 297 


271 


654 387 


373 


808 


480 


336 


1142 


722 




5 


NA 


NA 


28 


NA 


NA 


56' 


NA 


NA 


95 


NA 


NA \ 147 


NA 


NA 203 


NA 


NA 276 


334 


635 564 


459 


789 


465 


057 


1121 


710 




10 


NA 


NA 


24 


NA 


XA 


4» 


NA 


NA 


815 


NA 


NA : 1S7 


NA 


XA {8S 


NA 


NA 265 


NA 


NA • 343 


347 


758 


441 


771 


1088 


663 


15 


2 


NA 


NA 


sr. 


NA 


XA 


57 


NA 


NA 


as 


NA 


\A 178 


1(56 


473 241) 


211 


611 333 


264 


776 44«» 


362 


965 


bm 


520 


1373 


840 




5 


NA 


NA 


32 


NA 


NA 


61 


NA 


NA 


lOfi 


NA 


XA - lf.3 


NA 


NA 230 


261 


591 312 


325 


755 414 


444 


942 


531 


637 


1348 


825 




10 


NA 


XA 


27 


NA 


NA 


M 


NA 


NA 


96 


NA 


XA . 151 


NA 


NA 214 


NA 


NA 294 


392 


722 392 


531 


907 


304 


749 


1309 


.774 




15 


NA 


NA 


NA 


NA 


XA 


46 


NA 


NA 


" m 


NA 


NA ■ 138 


NA 


NA 198 


NA 


NA 278 


452 


692 _ 372 


606 


873 


481 


841 


1272 


■738 


a) 


2 


NA 


XA 


38 


NA 


XA 


73 


NA 


NA 


123 


NA 


NA M) 


163 


520 273 


206 


673 374 


258 


864 mi 


232 


1079 


025 


508 


1541 


930 




5 


NA 


NA 


35 


NA 


NA 


67 


NA 


NA 


-115 


NA 


XA . 183 


NA 


NA . 252 


255 


655 348 


317 


842 461 


433 


1055 


594 


623 


1518 


9» 




10 


NA 


NA 


NA 


NA 


NA 


59 


NA 


NA 


103 


NA 


NA 170 


NA 


NA 2S5 


312 


622 330 


382 


806 , 437 


517 


1016 


562 


733 


1475 


873 




15 


NA 


XA 


NA 


NA 


NA 


NA 


NA 


NA 


<)5 


NA 


NA ; 156 


NA 


NA , 217 


NA 


NA 311 


442 


773 , 414 


391 


979 


539 


823 


1434 


835 




20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


80 


NA 


XA ; 144 


NA 


NA 202 


XA 


NA 292 


XA 


XA 392 


663 


944 


510 


911 


1394 


800 


30 


2 


NA 


NA 


41 


NA 


NA 


SI 


NA 


NA 


136 


NA 


NA '- 215 


158 


578 302 


200 


759 420 


249 


982 556 


340 


1237 


715 


489 


178<) 


1110 




5 


NA 


NA 


NA 


NA 


NA 


75 


NA 


NA 


127 


NA 


NA : 196 


NA 


NA - -m 


245 


737 391 


3f)6 


958 524 


417 


1210 


680 


600 


1760 


109(j( 




10 


\A 


NA 


NA 


NA 


NA 


06 


NA 


NA 


IIS 


NA 


NA - 182 


NA 


NA . 2<J0 


300 


703 37ft 


370 


920 496 


500 


1168 


644 


70S 


1713 


1020 




15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


105 


NA 


NA ■ 168 


NA 


NA 240 


NA 


NA 349 


428 


884 , 471 


572 


1128 


. 615 


798 


1668 


•975 




%) 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


m 


NA 


NA ! 153 


NA 


XA 223 


NA 


NA ■ 327 


NA 


NA 445 


643 


1089 


385 


883 


1624 


932 




SO 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


XA 


NA 


XA ► NA 


NA 


NA l«2 


NA 


NA ; 281 


NA 


NA 408 


NA 


XA 


544 


1055 


1539 


885 


50 


2 


NA 


NA 


NA 


NA 


NA 


m 


NA 


NA 


HiO 


NA 


NA 250 


NA 


NA S50 


191 


837 4"5 


238 


1103 631 


323 


1408 


810 


463 


207(1 


1240 




5 


NA 


NA 


NA 


NA 


NA 


NA 


XA 


NA 


149 


NA 


NA < 228 


NA 


NA 321 


NA 


NA 442 


293 


1078 593 


398 


1381 


770 


571 


2044 


1220 




10 


NA 


NA 


NA 


NA 


XA 


NA 


XA 


NA 


136 


NA 


NA 212 


NA 


NA 301 


NA 


NA ■ 420 


355 


1038 562 


447 


1337 


728 


674 


1994 


1140 




15 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


124 


NA 


NA ' 195 


NA 


NA 278 


XA 


NA 393 


NA 


NA 333 


546 


1294 


695 


761 


1945 


1090 




20 


NA 


NA 


NA 


NA 


XA 


NA 


NA 


NA 


NA 


NA 


NA . 180 


NA 


NA 25« 


NA 


NA 370 


NA 


NA 5ft4 


616 


1251 


660 


844 


1898 


1040 




;!0 


NA 


NA 


NA 


NA 


XA 


Sa 


NA 


NA 


NA 


NA 


NA NA 


NA 


NA ■ NA 


NA 


NA 318 


NA 


NA 458 


NA 


NA 


610 


1009 


1805 


970 




Minimum 




12 






19 






28 






38 ' 




50 




63 




7« 




93 






132 






internal are'A 


















































of chimney 














































,^ 




Maximiim 




49 






m 






137 






I9S 




269 , 




352 




445 




350 






792 






internal area 


















































of chimney 

















































For SI units, 1 in. = 25.4 mm, 1 ft = 0..«505 m, 1000 Btu/hr = 0.293 kW, 1 in.'^ = 645 mm^. 
[NFPA 54 Table 13.1(d)] 



74 



WATER HEATERS 



Table 5-12 



Table 5-12 Single-Wall Metal Pipe or Type B Asbestos Cement Vent 











Number of Appliances: 


Single 




Appliance Type: 


Draft Hood-Equipped 




Appliance Vent Connection: 


Connected Directly to Pipe or Vent 










Diameter - U (in. ) 






lateral 
L 

(ft) 






To be used witfi chimney areas ttitfain the size limits at bottom 






3 


4 


5 


6 


7 


8 


10 


12 


Height 
H 

(ft) 


Appliance Input Rating in Thousands of Btu per Hour 


Maximum i^pliance Input Rating in Thousands of Btu per Hour 


6 





39 


70 


116 


170 


232 


312 


500 


750 




2 


31 


55 


94 


Ml 


194 


260 


415 


620 




5 


28 


51 


88 


128 


177 


242 


390 


600 


8 





4.2 


76 


126 


185 


252 


340 


542 


815 




2 


32 


61 


102 


154 


210 


284 


451 


680 




5 


29 


56 


95 


141 


194 


264 


4$() 


<>48 




10 


24 


49 


86 


131 


180 


250 


406 


625 


10 





45 


84 


138 


202 


279 


372 


606 


912 




2 


3a 


67 


HI 


168 


233 


311 


505 


7()0 




5 


32 


61 


104 


153 


215 


289 


.480 


724 




10 


27 


54 


94 


143 


200 


274 


455 


700 




15 


NA 


46 


84 


130 


186 


258 


432 


666 


15 





49 


91 


151 


223 


312 


420 


684 


1040 




2 


39 


72 


122 


186 


260 


350 


570 


865 




5 


35 


67 


110 


170 


240 


325 


540 


825 




10 


30 


58 


105 


158 


223 


308 


514 


795 




15 


NA 


50 


93 


144 


207 


291 


488 


760 




20 


NA 


NA 


82 


132 


195 


273 


466 


726 


20 





53 


101 


163 


252 


342 


470 


770 


11<W 




2 


42 


80 


136 


210 


286 


392 


641 


990 




5 


38 


74 


123 


192 


264 


364 


610 


945 




10 


32 


65 


115 


178 


246 


345 


571 


910 




13 


NA 


55 


104 


163 


228 


326 


550 


870 




20 


NA 


NA 


91 


149 


214 


306 


525 


832 


30 





56 


108 


183 


276 


384 


529 


878 


1370 




2 


44 


84 


148 


230 


320 


441 


730 


1140 




5 


NA 


78 


137 


210 


296 


410 


694 


1080 




10 


NA 


68 


125 


196 


274 


388 


656 


1050 




15 


NA 


NA 


113 


177 


258 


366 


625 


1000 




20 


NA 


NA 


99 


163 


240 


34.4 


596 


960 




30 


NA 


NA 


NA 


NA 


192 


295 


540 


890 


50 





NA. 


120 


210 


310 


443 


590 


980 


1550 




2 


NA 


95 


171 


260 


370 


492 


820 


1290 




5 


■ NA 


.NA 


159 


234 


342 


474 


780 


1230 




10 


NA 


NA 


146 


221 


318 


456 


730 


1190 




15 


NA 


NA 


NA 


200 


292 


407 


705 


1130 




20 


NA 


NA 


NA 


185 


276 


384 


670 


1080 




30 


NA 


NA 


NA 


NA 


222 


330 


605 


1010 



For SI units, 1 in. = 25.4 mm, 1 ft 

[NFPA 54 Table 13.1(e)] 



■■ O..S05 m, 1000 Btu/hr = 0.293 \\\', 1 in.'' = 645 mm-. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



75 



Table 5-13 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 5-13 Exterior Masonry Chimney 



Number of Appliances: 



Appliance Type: 



Appliance Vent Connection: 



Single 



Type B Double-Wall Connector 





SPECIAI. USE: Minimiun ^Utowable Input Rating 


of Space-Heating Appliance in 


11iODsan(k of Btu per Hour 




Vent Height 
H 

(ft) 


Internal Area of Chimney (in.'') 


12 


19 


28 




38 


50 




63 


78 


113 








Local 99% winter design temperaCttre: 37°1* 


or greater 






6 






























8 






























iO 






























15 


NA 



























20 


NA 


NA 


123 




190 


249 




184 








30 


NA 


NA 


NA 




NA 


NA 




393 


334 





50 


NA 


NA 


NA 




NA 


NA 




NA 


NA 


579 








I 


.«x-al 99% 


winter design 


teniperaune: 27°F to 36°F 






6 








68 




116 


156 




180 


212 


266 


8 








82 




127 


167 




187 


214 


263 


iO 





51 


9*7 




141 


183 




201 


225 


265 


15 


NA 


NA 


NA 




NA 


233 




253 


274 


305 


20 


NA 


NA 


NA 




NA 


NA 




307 


330 


362 


30 


NA 


NA 


NA 




NA 


NA 




419 


445 


485 


50 


NA 


NA 


NA 




NA 


NA 




NA 


xNA 


765 








1 


.ocal 99% 


winter design teinperaiure; 17 


F to 26^ 






6 


NA 


NA 


NA 




NA 


NA 




215 


259 


349 


8 


NA 


NA 


NA 




NA 


J97 




226 


264 


352 


10 


NA 


NA 


NA 




NA 


214 




245 


278 


358 


15 


NA 


NA 


NA 




NA 


NA 




296 


331 


398 


20 


NA 


NA 


NA 




NA 


NA 




352 


387 


457 


30 


NA 


NA 


NA 




NA 


NA 




NA 


507 


581 


50 


NA 


NA 


NA 




NA 


NA 




NA 


NA 


NA 










Local 99% 


winter desigr 


temperature: a" 


Ftol6°F 








6 


NA 


NA, 


NA 




NA 


NA 




NA 


NA 


416 


8 


NA 


NA 


NA 




NA 


NA 




NA 


312 


423 


10 


NA 


NA 


NA 




NA 


NA 




289 


331 


430 


15 


NA 


NA 


NA 




NA 


NA 




NA 


393 


485 


20 


NA 


NA 


NA 




NA 


NA 




NA 


450 


547 


30 


NA 


NA 


NA 




NA 


NA 




NA 


NA 


682 


50 


NA 


NA, 


NA 




NA 


NA 




NA 


NA 


972 








Local 99% 


winter design 


tempeiature: -10"F to 4"F 






6 


NA 


NA 


NA 




NA 


NA 




NA, 


NA 


484 


8 


NA 


NA 


NA 




NA 


NA 




NA 


NA 


494 


10 


NA 


NA 


NA 




NA 


NA 




NA 


NA 


513 


15 


NA 


NA 


NA 




NA 


NA 




NA 


NA 


586 


20 


NA 


NA 


NA 




NA 


NA 




NA 


NA' 


650 


30 


NA 


NA 


NA 




NA 


NA 




NA 


NA 


805 


50 


NA 


NA 


NA 




NA 


NA 




NA 


NA 


1003 








lx>cal 99% wnter design temperature: -1 1 


°F or low 


ex 














Not rccommcjided foi 


any vent configi 


rations 









Ft:>r SI units, 1 in. - 25.4 mm, 1 in." - 645 mm^ 1 ii = 0.305 m, 1000 Bin per hr = 0.293 kVV, "C - ("F - 32)/l .8. 
Note: Stie Figure G.2.4 for a map .showing local 99 percent winter design temperatiire.s in the United States. 
[NFPA 54 Table 13.1(f)] 



76 



WATER HEATERS 



Table 5-14 



Table 5-14 Type B Bouble-WaU Vent 





Number of Appliances: 


Two or More 




Appliance Type: 


Category I 




Appliance Vent Connection: 


Type B Doublc-WaJl Connector 



Vent Connector Capacity 



















Type 


B Doirbie-Wall Vent and Connector Diameter — 


DCui.) 














3 


4 


5 


6 


7 


8 


9 


10 


Vent 














Appliance Inpvtt Rating 


Limits in Thousands of Btu per Hour 












Height 
» 

(ft) 


Rise 
R 

(ft) 


FAN NAT 


FAN 


NTAT 
Max 


FAN 


NAT 
Max 


FAN 


NAT 
Max 


FAN 


NAT 

Max 


FAN NAT 


FAN 


NAT 


FAN 


NAT 


Min 


Max Max 


Min 


Max 


Min 


Max 


Min 


Max 


Min 


\tax 


Min 


Max Max 


Min 


Max 


Max Min 


Max 


Max 


6 


1 


22 


37 2fi 


35 


66 


46 


46 


106 


72 


58 


Kvl 


104 


77 


225 


■142 


92 


296 183 


im^ 


376 


237 


!28 


466 


' 289 




2 , 


23 


41 31 


37 


75 


53 


48 


121 


86 


60 


183 


124 


79 


253 


•168 


95 


333 220 


112 


424 


282 


131 


526 


345 




3 


24 


44 35 


38 


81 


62 


49 


132 


96 


62 


199 


139 


82 


275 


189 


97 


363 • 248 


114 


463 


317 


134 


575 


386 


8 


1 


22 


40 27 


35 


72 


48 


49 


114 


76 


64 


176 


109 


84 


243 


148 


100 


320 194 


118 


408 


'248 


138 


507 


303 




2 


23 


44 ,32 


36 


80 


57 


51 


128 


90 


66 


195 


129 


86 


269 


175 


103 


356 230 


121 


454 


294 


141 


564 


858 




3 


24 


47 3fi 


37 


87 


M 


53 


139 


101 


67 


210 


145 


88 


290 


19H 


105 


384 258 


123 


492 


330 


143 


612 


402 


10 


1 


22 


43 28 


34 


78 


50 


49 


123 


78 


65 


189 


113 


89 


257 


154 


106 


341 200 


125 


436 


257 


146 


542 


314 




2 


23 


47 33 


36 


86 


m 


51 


136 


93 


67 


2(K> 


134 


91 


282 


182 


109 


374 238 


128 


179 


305 


149 


596 


•372 




3 


24 


50 37 


37 


92 


m 


52 


146 


104 


69 


220 


150 


94 


303 


205 


111 


402 268 


131 


515 


342 


152 


fi-12 


417 


15 


1 


21 


50 ■ 30 


33 


89 


53 


47 


142 


83 


64 


220 


120 


88 


298 


163 


110 


389 214 


134 


493 


273 


162 


609 


333 




2 


22 


53 35 


35 


96 


63 


49 


153 


99 


66 


235 


142 


91 


320 


193 


112 


419 253 


137 


532 


323 


165 


658 


394 




3 


24 


55 40 


36 


102 


71 


51 


163 


111 


68 


248 


160 


93 


339 


218 


115 


445 286 


140 


565 


• 365 


167 


700 


444 


20 


1 


21 


54 3J 


33 


99 


56 


46 


157 


87 


62 


24f) 


125 


86 


334 


171 


107 


430 224 


131 


552 


285 


158 


681 


347 




2 


22 


57 37 


34 


105 


m 


48 


167 


104 


64 


259 


149 


89 


354 


202 


110 


463 265 


134 


:587 


3S9 


161 


725 


414 




3 


23 


60 42 


35 


110 


74 


50 


176 


116 


66 


271 


168 


91 


371 


228 


113 


486 300 


137 


618 


383 


164 


761 


466 


30 


1 


20 


62 33 


31 


113 


59 


45 


181 


93 


60 


288 


134 


83 


391 


182 


103 


512 238 


125 


(H9 


305 


151 


802 


372 




2 


21 


64 39 


33 


118 


70 


47 


190 


110 


62 


299 


158 


85 


408 


215 


105 


535 282 


129 


679 


360 


155 


810 


439 




3 


22 


66 44 


34 


123 


79 


48 


198 


124 


64 


309 


178 


88 


423 


242 


108 


553 817 


132 


706 


405 


158 


874 


494 


50 


I 


19 


71 36 


30 


133 


61 


43 


216 


101 


57 


349 


145 


78 


477 


197 


97 


627 257 


120 


797 


330 


144 


981 


403 




2 


21 


73 43 


32 


137 


76 


45 


223 


U9 


59 


358 


172 


81 


490 


234 


100 


645 306 


123 


820 


392' 


148 


1014 


478 




3 


22 


75 48 


33 


141 


86 


46 


229 


134 


61 


366 


194 


83 


502 


263 


103 


061 343 


126 


842 


441 


151 


1043 


538 


100 


1 


18 


ii2 37 


28 


158 


66 


40 


262 


104 


53 


442 


150 


73 


611 


204 


91 


810 266 


112 


1038 


341 


135 


1285 


■417 




2 


19 


83 . 44 


30 


161 


79 


42 


267 


123 


55 


447 


178 


75 


619 


242 


94 


822 316 


115 


1054 


405 


139 


1306 


•494 




3 


20 


84 , 50 


31 


163 


■ 89 


44 


272 


138 


57 


452 


200 


78 


627 


272 


97 


834 355 


118 


1069 


455 


142 


1327 


555 



Common Vent Capacity 





Type B Double-Wall Common Vent Diameter — » (in.) 




4 


5 


6 


7 


8 


9 


10 


Vent 

Height 

H 












Combined Apptianc 


e Input Rating in Thoiiisands of Btu per Hon 














FAN 


FAN 


NAT 


FAN 


FAN 


NAT 


FAN FAN NAT 


FAN FAN NAT 


FAN FAN 


NAT 


FAN 


FAN 


• NAT 


FAN 


FAN 


NAT 


(ft) 


+FAN 


+NAT +NAT 


+FAN +NAT 


+NAT 


+FAN +NAT +NAT 


+FAN +NAT +NAT 


+FAN +NAT 


+NAT 


+FAN +NAT +NAT 


•fFAN 


+NAT 


*NAT 


6 


92 


81 


05 


140 


116 


103 


204 161 147 


309 248 200 


404 314 


2611 


547 


434 


335 


672 


520 


410 


8 


101 


, 90 


73 


155 


129 


114 


224 178 163 


339 275 223 


444 348 


2911 


602 


480 


378 


740 


. 577 


465 


10 


110 


97 


79 


169 


141 


121 


243 194 178 


367 299, 242 


477 377 


315 


649 


522 


405 


800 


627 


rr, 


15 


125 


112 


91 


195 


164 


1 14 


283 228 206 


427 352 2«0 


556 444 


3'i5 


753 


612 


465 


924 


733 


565 ,; 


20 


136 


123 


1112 


215 


183 


Kill 


314 255 229 


475 394 310 


621 499 


11 15 


842 


088 


523 


1035 


826 


;640 


30 


152 


138 


118 


244 


210 


185 


361 297 266 


547 459 360 


720 585 


170 


979 


808 


605 


1209 


975 


■7.10 ■ 


50 


167 


153 


134 


279 


244 


211 


421 363 310 


641 547 423 


854 706 


551) 


ilM 


977 


705 


1451 


1188 


.860 \ 


100 


175 


163 


NA 


311 


277 


\\ 


189 421 NA 


751 658 479 


1025 873 


(I'J'i 


1408 


1215 


800 


1784 


1502 


975 1 



[NFPA 54 Table 1 3.2(a) 1 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



77 



Table 5-14 continued 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 5-14 Continued 



















Number of Appliances: 


Two or More 




Appliance 


T>pe: 


Category I 




AppUance Vent Connection: 


Type 


B Double-Wall Connector 
















T>T>e 


B Double-WaU Vent and Connector Diameter — D (in.) 












12 


14 


16 


18 


20 


22 


24 


Vent 


Appliance Input Rating Limits in Thousands of Btu per Hour 


Height 
H 

m 


Rise 
R 

(ft) 


FAN NAT 


FAN NAT 


FAN NAT 


FAN NAT. 


FAN 


NAT 
Max 


FAN 'NAT 


FAN 


NAT 


Min 


Max Max 


Min 


Max - Max 


Min 


Max Max 


Min Max Max 


Min 


Max 


Min 


Max iMax 


Min 


Max 


Max 


6 


2 


174 


764 496 


223 


1046 ; 653 


281 


1371 853 


346 1772 1080 


NA 


NA NA 


NA 


NA NA 


NA 


NA 


NA 




4 


180 


897 616 


230 


1231 827 


287 


1617 1081 


352 2069 1370 


NA 


NA NA 


NA 


NA NA 


NA 


NA 


NA 




6 


NA 


NA NA 


NA 


NA NA 


NA 


NA NA 


NA NA ISIA. 


NA 


NA NA 


NA 


NA NA 


NA 


NA 


NA 


8 


9 


18(5 


822 316 


238 


1126 696 


298 


1478- 910 


365 1920 1150 


NA 


NA NA 


NA 


NA NA 


NA 


NA 


NA 




4 


192 


932 644 


244 


1307 884 


305 


1719 1150 


372 2211 1460 


471 


2737 1800 


560 


3319 2180 


662 


.3937 


2590 




6 


198 


1050 772 


252 


1445 1072 


313 


1902 1390 


380 2434 1770 


478 


3018 2180 


5t)8 


3665 2640 


669 


4373 


3130 


10 


2 . 


196 


870 ■ 536 


249 


1195 730 


311 


1570 955 


379 2049 1205' 


NA 


NA NA 


NA 


NA NA 


NA 


NA 


NA 




4 


201 


997 664 


256 


1371 924 


318 


1804 ,1205 


387 2332 1535 


486 


2887 , 1890 


581 


3502 2280 


686 


4175 


2710 




6 


207 


10<)5 792 


263 


1509 1U8 


325 


1989 1455 


395 2556 1865 


494 


3169 2290 


589 


3849 2760 


694 


4503 


3270 


15 


2 


214 


967 368 


272 


1334 790 


336 


1760 lOSO 


408 2317 1305' 


NA 


NA . NA 


NA 


NA ' NA 


NA 


NA 


■NA 




4 


221 


1085 , 712 


279 


14TO,1006 


344 


1978 1320 


416 2579 1665 


523 


3197 ;2060 


624 


3881 2490 


734 


4631 


2960 




6 


228 


1181 856 


286 


1632 ■ 1222 


351 


2157 1610 


424 2796 2025 


533 


3470 2310 


634 


4216 ;30S0 


743 


5033 


3600 


20 


2 


223 


1051 396 


291 


1443 840 


357 


1911 1095 


430 2533 1385 


NA 


NA NA 


NA 


NA • NA 


NA 


NA 


NA 




4 


230 


1 162 748 


298 


1597 1064 


366 


2116 1393 


438 2778 . I765r 


554 


3447 2180 


661 


4190 -2630 


772 


5005 


3130 




6 


237 


1253 900 


307 


1726 1288 


373 


2287 1695 


450 2984 2145:- 


567 


8708 ,2650 


671 


4511 ,3190 


785 


5392 


3790 


30 


2 


216 


1217 632 


286 


1664 910 


367 


2183,1190 


461 2891 1540 


NA 


NA ■ NA 


NA 


NA ~ NA 


NA 


NA 


NA 




4 


223 


131ti 792 


294 


1802 1160 


376 


2366' 1510 


474 3110 \WS 


619 


3840 2365 


728 


4861 2860 


847 


5606 


3410 




6 


231 


1400 952 


303 


1920 1410 


384 


2524 1830 


485 3299 2340 


632 


4080 1 2875 


741 


4976 '3480 


860 


5961 


4150 


50 


2 


206 


1479 689 


273 


2023 1007 


350 


2639,1315 


435 3548 1665' 


NA 


NA. NA 


NA 


NA NA 


NA 


NA 


•' NA 




4 


213 


1561 . 860 


281 


2139 1291 


359 


2814 1685 


447 3730 2135 


580 


4601 26-33 


709 


5569 3183 


851 


6633 


3790 




6 


221 


1631 1031 


290 


2242 1375 


369 


2951 20S5 


461 3893 26()5< 


594 


4808.3208- 


724 


3826 3885 


867 


6943 


4620 


100 


2 


192 


1923 712 


254 


2644 1050 


326 


3490 ,1370 


402 4707 1740: 


NA 


NA NA 


NA 


NA NA 


NA 


NA 


NA 




4 


200 


1984 888 


263 


2731 ,1346 


336 


3606 .1760 


414 4842 2220 


523 


5982 2750 


639 


7254 3330 


769 


8630 


3950 




6 


208 


2035 1064 


272 


2811 1642 


346 


3714 ;2150 


426 4968 2700, 


539 


6143 3350 


654 


7453 4070 


786 


8892 


4810 



Common Vent Capacity 













Type B Double-Wall Common Vent Diameter — D 


(in.) 














12 


14 


16 


18 


20 


22 


24 


Vent 








Combined Appliance Input Rating in Thousands of Btu 


per Ho 


ur 










H 


FAN 


FAN 'NAT 


FAN 


FAN 


:NAT 


FAN 


FAN NAT 


FAN 


FAN NAT 


FAN FAN 


NAT 


FAN 


FAN NAT 


FAN 


FAN 


NAT 


(ft) 


fFAN 


+NAT +NAT 


+FAN +NAT 


'>NAT 


+FAN +NAT +NAT 


+FAN 


-►NAT +NAT 


+FAN +NAT 


+NAT 


+FAN 


+NAT +NAT 


+FAN 


+NAT 


+NAT 


6 


900 


696 588 


1284 


990 


■ 815 


1735 


1336 1063 


2253 


1732 1345 


2838 2180 , 


1660 


3488 


2677 1970 


4206 


3226 


2S')1) 


8 


994 


773 652 


1423 


1 103 


: 912 


1927 


1491 1190 


2507 


1936 1510 


3162 2439 ' 


I860 


3890 


2998 . 2200 


4695 


3616 


2().S0 


10 


1076 


841 - 712 


1542 


1200 


' 995 


2093 


1625 ■ 1300 


2727 


2113 1645 


3444 2665 


2030 


4241 


3278 2400 


5123 


3957 


2920 


15 


1247 


986 825 


1794 


1410 


11S8 


2440 


1910 .1510 


3184 


2484 1910 


4026 3133 


2360 


4971 


3862 , 2790 


6016 


4670 


3100 


20 


1405 


1116 916 


2006 


158S 


1290 


2722 


2147 1690 


3561 


2798 2140 


4548 3352 


2640 


5373 


4352 i 3120 


6749 


5261 


•WIM) 


30 


1658 


1327 1025 


2373 


1892 


1523 


3220 


2558 1990 


4197 


3326 ' 2320 


5303 4193 


3110 


*>539 


5157 , 3680 


7940 


6247 


14W) 


30 


2024 


1640 ■ 1280 


2911 


2347 


, 1863 


3964 


3183 2430 


3184 


4149 307S 


6367 5240 


S800 


8116 


6458 : 4500 


9837 


7813 


-|175 


100 


2569 


2131 , 1870 


3732 


3076 


2450 


5125 


4202 3200 


6749 


550<» 4050 


8597 ()980 


5000 


10,681 


8648 ■ 5920 


13,004 


10,49<) 


7200 



For SI units, 1 in. = 25.4 mm, 1 in.^' = 64,5 mni'-, 1 ft = 0.30.5 m, 1000 Bin per hr = 0.293 kW. 
[NFPA 54 Table 13.2(a)] 



78 



WATER HEATERS 



Table 5-15 



Table 545 Type B Double-WaU Vent 





Niimber of Appliances: 


Two or Moi-e 




Appliance Type: 


Category I 




Appliance Vent Cotmection: 


Sin^c-Wall Metal Connector 



Vent Connector Capacity 





















Single-Wall Metal Vent Connector Diameter 


— jD(in.) 












3 


4 


5 


6 


7 


8 


9 


10 


Vent 
















Appliance Input Rating 


limits! in Thousands of Btu per Hour 










Height 
H 

(ft) 


Rise 
R 

(ft) 


FAN 


NAT 
Max 


fan' 


NAT 
Max 


FAN 


NAT 
Max 


FAN 


NAT 
Max 


FAN 


NAT 

Max 


FAN 


NAT 
Max 


FAN 


NtAT 
Max 


FAN NAT 


Min 


Max 


Min 


Max 


Min 


Max 


Min 


Max 


Mui 


Max 


Min 


Max 


Min 


Max 


Min 


Max Max 


6 


1 


NA 


NA 


26 


NA 


NA 


46 


NA 


NA 


, 71 


NA 


NA 


102 


207 


223 


140 


262 


293 


183 


325 


373 


2S4 


447 


463 ' 286 




2 


NA 


NA 


31 


NA 


NA 


,55 


NA 


NA 


85 


168 


182 


123 


215 


251 


167 


271 


331 


219 


334 


422 


281 


458 


524 -344 




3 


NA 


NA 


34 


NA 


NA 


62 


121 


131 


95 


175 


198 


138 


222 


273 


188 


279 


361 


247 


344 


462 


316 


468 


574 r 385 


8 


1 


NA 


NA 


•27 


NA 


NA 


48 


NA 


NA 


76 


NA 


NA 


106 


226 


240 


145 


285 


316 


191 


352 


403 


244 


481 


502 299- 




2 


NA 


NA 


32 


NA 


NA 


57 


125 


126 


89 


184 


193 


127 


234 


266 


173 


293 


353 


228 


360 


450 


292 


492 


560 , 355 




3 


NA 


NA 


■35 


NA 


NA 


64 


130 


138 


100 


191 


208 


144 


241 


287 


197 


302 


381 


256 


370 


489 


328 


501 


609 400 


10 


1 


NA 


NA 


28 


NA 


NA 


50 


119 


121 


77 


182 


186 


HO 


240 


253 


150 


302 


335 


196 


372 


129 


252 


506 


534 ; 308 




2 


NA 


NA 


33 


84 


85 


53 


124 


134 


91 


189 


203 


132 


248 


278 


183 


311 


369 


23S 


381 


473 


302 


517 


589 \ 368 




3 


NA 


NA 


36 


89- 


91 


■67 


120 


144 


102 


197 


217 


148 


257 


299 


203 


320 


398 


265 


391 


511 


S^ 


528 


637 ; ^13' 


13 


I 


NA 


NA 


29 


79 


87 


■82 


116 


138 


81 


177 


214 


1)6 


238 


291 


158 


312 


380 


208 


397 


482 


266 


556 


596 ' 324 




2 


NA 


NA 


34 


83 


94 


62 


12! 


150 


97 


185 


230 


138 


246 


314 


\m 


321 


411 


248 


407 


522 


317 


568 


646 , 387' 




3 


NA 


NA 


39 


B7 


KK) 


70 


127 


160 


109 


193 


243 


157 


255 


333 


215 


331 


438 


281 


418 


557 


360 


579 


690 ■ 437- 


20 


1 


49 


56 


30 


78 


97 


54 


115 


152 


84 


175 


238 


120 


233 


325 


165 


306 


425 


217 


390 


538 


'276 


546 


664 I 336 




2 


52 


59 


36 


82 


103 


64 


120 


163 


101 


182 


252 


144 


243 


346 


197 


317 


453 


259 


400 


574 


331 


558 


709 \ 403 




3 


55 


62 


40 


87 


107 


72 


125 


172 


US 


190 


264 


164 


252 


363 


22S 


326 


476 


294 


412 


607 


375 


570 


750 ; 457 


30 


1 


47 


60 


31 


77 


110 


57 


112 


175 


89 


109 


278 


129 


226 


380 


175 


296 


497 


230 


378 


630 


2«4 


528 


779 : 358 




2 


51 


62 


37 


81 


115 


67 


117 


185 


106 


177 


290 


152 


236 


397 


208 


307 


521 


274 


389 


662 


349 


541 


819 ,"425- 




3 


54 


64 


42 


85 


119 


76 


122 


193 


120 


185 


300 


172 


244 


412 


235 


316 


512 


309 


400 


690 


394 


555 


855 j 482" 


50 


1 


46 


m 


34 


75 


128 


60 


109 


207 


m 


162 


336 


137 


217 


460 


188 


284 


604 


245 


364 


768 


314 


507 


951 ; 384 




2 


49 


71 


40 


79 


132 


72 


114 


215 


1J3 


170 


345 


164 


226 


473 


223 


294 


023 


293 


370 


793 


376 


520 


983 458 




3 


52 


72 


45 


83 


136 


82 


119 


221 


123 


178 


353 


186 


235 


486 


252 


304 


640 


331 


387 


816 


423 


535 


1013 ; 5!8. 


100 


1 


45 


79 


34 


71 


150 


61 


10-t 


249 


98 


153 


424 


140 


205 


585 


192 


269 


774 


249 


345 


993 


321 


476 1236 ^. 393' 




2 


48 


80 


41 


75 


153 


73 


110 


255 


115 


m) 


428 


167 


212 


593 


228 


279 


788 


299 


358 


1011 


383 


490 1259 ' 469 




3 


51 


81 


46 


79 


157 


■ 85 


114 


260 


129 


168 


433 


190 


222 


603 


256 


289 


801 


SS9 


368 


1027 


431 


506 1280 -; 527 



Common Vent Capacity 

















Type B Double-Wall Vent Diameter 


-D(in.) 














4 


5 ■ 


6 


7 


S 


9 


10 


Vent 

Height 

H 












C 


ombined Appl 


ance Input Rating in Thousan 


dsof Btnper 


Hour 










FAN 


FAN 


NAT 


FAN 


FAN 


NAT 


FAN FAN 


NAT 


FAN FAN NAT 


FAN FAN 


NAT 


FAN 


FAN 


HAT 


FAN 


FAN 


NAT. 


(ft) 


+FAN 


+NAT 


4-NAT 


♦•FAN 


+NAT 


+\AT 


+FAN +NAT 


+NAT 


+FAN+NAT +NAT 


fFAN +NAT 


+NAT 


i-FAN 


+NAT 


■+NAT 


i-FAN +NAT 


+NAT 


6 


NA 


78 


64 


NA 


113 


'19 


200 158 


144 


304 244 196 


398 310 


257 


541 


429 


332 


665 


515 


407 


8 


NA 


87 


71 


NA 


126 


III 


218 173 


159 


331 269 218 


436 312 


■ 285 


592 


473 


373 


730 


569 


■460 


10 


NA 


94 


76 


163 


. 137 


IJO 


237 189 


174 


357 292 . 236 


467 369 


309 


638 


512 


, 398 


787 


617 


, 487 


15 


121 


108 : 


m 


189 


159 


no 


275 221 


200 


416 313 -274 


544 134 


357 


738 


59<) 


456 


905 


718 


553 


20 


131 


118 


■ 98 


208 


177 


|-.t) 


305 247 


223 


463 383 302 


606 487 


- 395 


824 


673 


512 


1013 


808 


626 


30 


145 


132 


US 


236 


202 


ISO 


350 286 


257 


533 446 ■ 349 


703 570 


459 


958 


790 


593- 


1183 


952 


723 


50 


159 


145 


128 


268 


233 


2(iN 


40(> 337 


296 


622 529 410 


833 ()86 


535 


1139 


954 


689 


1418 


1157 


838 


100 


166 


153 


NA 


297 


263 


NA 


469 398 


NA 


726 633 464 


99«) 846 


606 


1378 


1185 


780 


1741 


1459 


948 



[NFPA 54 Table 13.2(1))] 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



79 



Table 5-16 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 5-16 Masonry Chimney 





Number of Appliances: 


Two or More 




Appliance Type: 


Category I 




Appliance Vent Connection: 


Type B Double-Wall Connector 



Vent Connector Capacity 





















Type B Double-Wall Vent Connector Diameter 


_D 


in.) 
















3 


4 


5 


6 


1 


8 


9 


10 


Vent 














Appliance Input Rating limits 


in Thousands of Btu pet 


Houi 














Height 
H 

(ft) 


Rise 
R 

(ft) 


FAN 


NAT 
Max 


FAN 


NAT 
Max 


FAN NAT 


FAN NAT 


FAN 


NAT 
MaK 


FAN 


NAT 
Max 


FAN 


NAT 
Max 


FAN NAT 


Min 


Max 


Min 


Max 


Min 


Max Max 


Min 


Max Max 


Min 


Max 


Min 


Max 


Min 


Max 


Min 


Max Max 


6 


1 


24 


33 


2J 


39 


62 


40 


52 


106 67 


65 


194 101 


87 


274 


141 


104 


370 


201 


124 


479 


253 


145 


599 319 




2 


26 


43 


28 


41 


79 


52 


53 


133 85 


67 


230 124 


89 


324 


173 


i07 


436 


232 


127 


562 


3«» 


148 


694 378 




3 


27 


49 


34 


42 


92 


61 


55 


155 97 


69 


262 143 


91. 


369 


203 


109 


491 


270 


129 


633 


349 


151 


795 439 


8 


1 


24 


3<» 


22 


39 


"2 


41 


55 


117 69 


71 


213 , 105 


94 


304 


148 


113 


414 


210 


134 


539 


267 


156 


682 ■ 335 




2 


26 


47 


. 29 


40 


87 


•53 


57 


140 86 


73 


246 127 


97 


350 


179 


116 


473 


240 


137 


615 


311 


160 


776 ' 394 




3 


27 


52 


34 


42 


97 


62 


59 


159 98 


75 


269 145 


99 


383 


206 


119 


517 


276 


139 


672 


358 


163 


848 452 


10 


! 


24 


42 


22 


38 


80 


42 


55 


130 - 71 


74 


232 108 


101 


324 


153 


120 


44 4 


216 


142 


582 


277 


165 


739 348 




2 


26 


50 


29 


40 


93 


34 


57 


153 87 


76 


261 129 


103 


366 


184 


123 


498 


247 


145 


652 


321 


168 


825 407 




3 


27 


55 


35 


41 


105 


63 


58 


170 100 


78 


284 148 


106 


397 


209 


126 


510 


281 


147 


705 


366 


171 


893 463 


15 


1 


24 


48 


23 


38 


93 


44 


54 


154 74 


72 


277 1 14 


100 


384 


164 


125 


511 


229 


153 


658 


297 


IS-l 


824 ' 375 




2 


25 


55 


31 


39 


105 


55 


56 


174 89 


74 


299 134 


103 


419 


192 


128 


558 


260 


156 


718 


339 


187 


900 432 




3 


26 


59 


■35 


41 


115 


64 


57 


189 102 


76 


319 153 


JOS 


448 


215 


131 


597 


292 


159 


7(i0 


382 


M) 


9(>0 486 


20 


1 


• 24 


52 


24 


37 


102 


46 


53 


172 77 


71 


313 119 


98 


437 


173 


123 


584 


239 


150 


752 


312 


180 


943 397 




2 


25 


58 


31 


39 


114 


56 


55 


190 91 


73 


335 138 


101 


407 


199 


126 


(525 


270 


153 


805 


354 


184 


1011 452 




■ 3 


26 


63 


35 


40 


123 


65 


57 


204 104 


75 


353 157 


104 


493 


222 


129 


661 


301 


156 


851 


396 


187 


1067 505 


30 


1 • 


24 


54 


26 


37 


11! 


48 


52 


192" 82 


69 


357 • 127 


96 


504 


187 


119 


680 


255 


145 


883 


337 


175 


1115 432 




2 


25 


60 


32 


38 


122 


58 


54 


208 95 


72 


376 145 


99 


531 


209 


122 


715 


mi 


149 


928 


378 


179 


1171 484 




3 


26 


O'l 


36 


40 


131 


66 


56 


221 107 


74 


392 ; 163 


101 


554 


233 


125 


746 


sn 


152 


968 


418 


182 


1220 535 


50 


1 


23 


51 


25 


36 


116 


51 


51 


209 89 


67 


405 • 143 


92 


582 


213 


115 


798 


294 


140 


1019 


392 


168 


1334 506 




2 


24 


59 


32 


37 


127 


, 61 


53 


225 !02 


70 


421 161 


95 


604 


235 


118 


827 


326 


143 


1085 


433 


172 


1379 558 




3 


26 


6-1 


36 


39 


135 


69 


55 


237 115 


72 


435 180 


98 


624 


260 


121 


854 


357 


147 


1118 


474 


176 


1121 611 


100 


1 


23 


46 


24 


35 


108 


50 


49 


208 - 92 


65 


428 : 155 


88 


040 


237 


109 


907 


334 


13^1 


1222 


454 


161 


1589 596 




2 


24 


53 


31 


37 


120 


60 


51 


224 105 


67 


444 ' 174 


92 


mo 


260 


113 


933 


368 


138 


1253 


497 


165 


1620 651 




3 


25 


5<t 


35 


38 


130 


68 


53 


237 118 


69 


458 193 


94 


679 


285 


116 


95r) 


399 


141 


1282 


540 


169 


1661 705 



Common Vent Capacity 





Minimum Internal Area of Masonry Chlnuiey Flue (in.^) 




12 


19 


28 


38 


50 


65 


78 


113 


Vent 


Combined Appliance Input Rating in Thousands of Btu per Hour 


H 


FAN 


FAN 


NAT 


FAN 


FAN 


NAT 


FAN 


FAN NAT 


FAN 


FAN NAT 


FAN FAN NAT 


FAN FAN 


NAT 


FAN 


FAN NAT 


FAN 


FAN 


NAT 


(ft) 


hFAN- 


hNATH 


NAT 


(•FAN-t 


NATh 


-NAT 


hFANh 


►NAT+NAT 


i-FAN+NAT+NAT 


i-FAN+NAT+NAT 


hFAN+NATn 


-NAT 


i-FANh 


-NAT+NAT 


^-FAN 


fFAN 


+NAT 


6 


NA 


74 


25 


NA 


119 


46 


NA 


178 , 71 


NA 


257 103 


NA 351 ; 143 


NA 458 


188 


NA 


582 246 


1041 


853 


W 


8 


NA 


80 


28 


\A 


130 


53 


NA 


!93 82 


NA 


279 1 19 


NA 384 • 163 


NA 501 


218 


724 


636 278 


1144 


937 


Jos 


10 


NA 


84 


SI 


NA 


138 


56' 


NA 


207 90 


NA 


299 131 


NA 409 : 177 


()06 538 


236 


776 


686 . 302 


1226 


1010 


151 


15 


NA 


N'A 


36 


NA 


152 


67- 


NA 


233 ' 106 


NA 


334 152 


523 467 J 212 


682 611 


283 


874 


781 ■ 365 


1374 


1156 


1 16 


20 


NA 


NA 


41 


\A 


NA 


75 


NA 


250 122 


NA 


368 . 172 


565 508 •• 2^3 


742 668 


325 


955 


858 419 


1513 


1286 


(>1H 


30 


NA 


NA 


NA 


NA 


NA 


NA- 


NA 


270 137 


NA 


404 198 


615 564 1 278 


816 747 


381 


1062 


969 496 


1702 


1473 


719 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA NA 


NA 


NA NA 


NA 620 ; .328 


879 831 


46! 


1165 


1089 606 


1905 


1692 


922 


100 


NA 


NA 


SA 


NA 


NA 


NA 


NA 


NA. NA 


NA 


NA NA 


NA NA; 348 


NA NA 


4m 


NA 


NA ,, 669 


2053 


1921 


l()-)8 



[NFPA 54 Table 13.2(c)] 



80 



WATER HEATERS 



Table 5-17 



Table 5-17 Masonry Chimney 





Number of Appliances: 


Two or More 




Appliance Type: 


Category- 1 




Appliance Vent Conneclion: 


Single-Wall Metal Conocdor 



Vent Connector Capacity 





Connector 

Riiie 

R 

m 
















Single-Wall Metal Vent Connector Diameter - 


-0(in.) 














3 


■ 4, 


5 


6 


7 


8 


9 


10 


Vent 

Height 

H 

(ft) 














Appliance In 


put Rating limits in Thousands of Btu per Hojir 










FAN 


NAT 
Max 


FAN 


NAT 
Max 


FAN 


NAT 
Max 


FAN 


NAT 
Max 


FAN NAT 


FAN 


NAT 
Mas 


FAN 


NAT 


FAN 


NAT 


mn 


Mas 


Min 


Max 


Mjn 


Max 


Min 


Max 


Min 


Max Max 


Mm 


Max 


Min 


Mas 


Max 


Min 


Max 


Max 


6 


1 


NA 


NA 


21 


NA 


NA 


S9 


NA 


NA 


66 


179 


191 


100 


231 


271 140 


292 


300 


200 


362 


474 


252 


4:99 


694 


310 




2 ■ 


NA 


NA 


28 


NA 


NA 


52 


NA 


NA 


84 


186 


227 


123 


239 


321 172 


301 


432 


231 


373 


557 


299 


509 


696 


376 




3 


NA 


\A 


34 


NA 


NA 


61 


134 


153 


97 


193 


258 


142 


247 


3(i5 2<12 


309 


491 


269 


381 


634 


348 


519 


793 


437 


8 


1 


NA 


NA 


21 


NA 


NA 


40 


NA 


NA 


68 


195 


208 


103 


250 


298 146 


313 


407 


207 


387 


530 


203 


529 


672 


331 




2 


NA 


NA 


28 


NA 


NA 


52 


137 


139 


85 


202 


240 


125 


258 


343 177 


323 


46r> 


238 


397 


()07 


309 


54.0 


766 


391 




S 


NA 


NA 


S-1 


NA 


NA 


02 


143 


156 


98 


210 


264 


145 


266 


376 205 


332 


509 


274 


407 


663 


356 


551 


838 


450 


10 


1 


NA 


NA 


22 


NA 


NA 


41 


130 


151 


70 


202 


225 


106 


267 


316 151 


333 


434 


213 


41.0 


571 


27S 


558 


727 


343 




2 


NA 


\A 


n 


NA 


NA 


53 


136 


150 


86 


210 


255 


128 


276 


358 181 


343 


489 


244 


420 


640 


317 


569 


813 


-103 




3 


NA 


NA 


34 


97 


102 


62 


143 


166 


99 


217 


277 


147 


284 


389 207, 


352 


530 


279 


430 


69! 


363 


580 


880 


459 


15 


1 


NA 


NA 


23 


NA 


NA 


43 


129 


151 


73 


199 


271 


112 


268 


376 16! 


349 


502 


225 


445 


646 


291 


623 


808 


366 




2 


NA 


NA 


30 


92 


103 


54 


135 


170 


m 


207 


295 


132 


277 


411 189 


359 


518 


256 


456 


706 


334 


634 


884 


42'1 




3 


NA 


NA 


:« 


96 


112 


63 


141 


185 


101 


215 


315 


151 


286 


439 213 


368 


58(i 


289 


4.66 


755 


:'.78 


646 


945 


479 


20 


1 


NA 


NA 


23 


87 


99 


45 


128 


167 


, 76 


197 


303 


ii? 


265 


425 169 


345 


569 


235 


439 


734 


806 


014 


921 


387 




9 


NA 


NA 


SO 


91 


tti 


55 


134 


185 


90 


205 


325 


136 


274 


455 195 


355 


610 


266 


450 


787 


318 


627 


986 


443 




3 


NA 


NA 


35 


96 


119 


64 


140 


199 


103 


213 


343 


154 


282 


481 219 


365 


644 


298 


461 


831 


391 


639 


1042 


496 


30 


1 


NA 


NA 


24 


8<5 


108 


47 


126 


187 


80 


193 


347 


124 


259 


492 ' 183 


338 


665 


250 


430 


864 


330 


600 


1089 


42! 




2 


NA 


NA 


31 


91 


119 


57 


132 


203 


93 


201 


366 


142 


269 


518 205 


348 


699 


282 


442 


908 


372 


613 


1145 


473 




3 


NA 


NA 


33 


95 


127 


6r. 


138 


216 


105 


209 


381 


160 


277 


510 229 


358 


729 


312 


4.59 


916 


412 


626 


1193 


524 


50 


1 


NA 


NA 


24 


85 


113 


50 


124 


204 


87 


188 


392 


139 


252 


567 ■ 208 


328 


778 


287 


417 


1022 


383 


582 


1302 


492 




2 


NA 


NA 


31 


89 


123 


60 


130 


218 


IW 


196 


408 


158 


2()2 


588 2S«t 


339 


806 


320 


429 


1058 


425 


596 


1346 


545 




3 


NA 


NA 


35 


94 


131 


68 


136 


231 


112 


205 


422 


176 


271 


607 265 


349 


831 


351 


4.40 


10<)0 


- 466 


610 


1386 


597 


U«> 


1 


NA 


NA 


23 


84 


104 


49 


122 


200 


89 


182 


410 


151 


243 


617 232 


315 


875 


328 


402 


1181 


444 


560 


1537 


580 




2 


NA 


NA 


30 


88 


115 


59 


127 


215 


102 


190 


425 


169 


253 


630 254 


326 


809 


961 


415 


1210 


488 


575 


1570 


634 




3 


NA. 


NA 


34 


93 


124 


67 


133 


228 


115 


199 


438 


188 


262 


654 279 


337 


921 


392 


427 


1238 


529 


589 


1604 


687 



Common Vent Capacity 



















Mimmnm Internal Area of Masonry Chimney Flue (in 


.') 












12 


19 


28 


38 


50 


63 


78 


1J3 


Vent 

Height 

H 

m 
















Combined Appliance Input Rating in llioitsands of Btu pt 


r Hour 








FvUSf FAN 
hFAN+NAT 


NAT 
t-NAT 


FAN FAN NAT 

i-FAN+NAT+NAT 


FAN 

^FAN^ 


F/VN NAT 
■NAT+NAT 


FAN FAN NAT 

hFAN+NAT+NAT 


FAN FAN NAT 
i-FAN+NAT+NAT 


FAN FAN NAT 
kFAN+NAT+NAT 


FAN 

^FAN H 


FAN -NAT 
"NAT+NAT, 


FAN 
hFAN 


FAN 
+FAN 


■NAT 
+NATj 


6 


NA 


NA 


25 


NA 


118 


45 


NA 


17b 71 


NA 255 im 


NA 348 142 


NA 


155 


187 


NA 


579 245 


NA 


846 


. NA 


8 


NA 


NA 


28 


NA 


128 


52 


NA 


190 81 


NA 276 118 


NA 380 162 


NA 


497 


217 


NA 


633 : 277 


1136 


928 


-105 


10 


NA 


NA 


31 


NA 


I3(i 


56 


NA 


205 89 


NA 295 12*1 


NA 405 1 75 


NA 


532 


234 


771 


680 , 301) 


1216 


1000 


-450 


15 


NA 


NA 


36 


NA 


NA 


66 


NA 


230 105 


NA 335 150 


NA 400 210 


677 


602 


280 


866 


772 3(>0 


1359 


1139 


540 


20 


NA 


NA 


NA 


NA 


NA 


■ 74 


NA 


247 120 


NA 362 - 170 


NA 503 240 


76-1 


661 


321 


947 


849 . 415 


1495 


1264 


. 04() 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 135 


NA 398 193 


NA 558 -275 


808 


730 


377 


1052 


957 490 


1682 


1447 


740 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA NA- 


NA NA NA 


NA 612 325 


NA 


821 


456 


1152 


1076 «Kt 


1879 


1672 


910 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA NA 


NA NA NA 


NA NA NA 


NA 


NA 


494 


NA 


NA 6ti3 


2006 


1885 


: 1046 



For SI units, 1 in. = 25.4 mm, 1 in.^ = (.)45 nnn''*, 1 ft = 0.305 m, 1 000 Btu per fir = 0.293 kW. 
[NFPA 54 Table 13.2(d) J 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



81 



Table 5-18 -Table 5-19 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 5-18 Single-Wall Metal Pipe or Type B Asbestos Cement Vent 





Number of Appliances: 


Two or More 




Appliance T^'pe: 


Draft Hood-Equipped 




Appliance Vent Connection: 


Direct to Pipe or Vent 



Vent Connector Capacity 




Vent Connector Diameter — D (in. ) 



Maximum Appliance Input Rating in Thousands of Btu per Hour 



ft-8 



68 
86 
98 



102 
124 
147 



146 

178 
204 



205 
235 
275 







1 


23 


44 


77 


117 


179 


240 


15 




2 


30 


56 


92 


134 


194 


265 






3 


35 


64 


102 


155 


216 


298 






1 


25 


49 


84 


129 


190 


270 


30 




2 


31 


58 


97 


145 


211 


295 


and up 




3 


36 


68 


107 


164 


232 


321 


Common Vent 


Cstpaciiy 

















Common Vent Diameter — D (in.) 



10 



12 



Total Vent 
H 

(ft) 


Height 






Combined Appliance Input Rating in Thousands of 
Btu per Hour 








6 




48 


78 


111 




155 


205 


320 


NA 


8 




55 


89 


128 




175 


234 


365 


505 


10 




59 


95 


136 




190 


250 


396 


560 


15 




71 


115 


168 




228 


305 


480 


690 


20 




80 


129 


186 




260 


340 


550 


790 


30 




NA 


147 


215 




300 


400 


650 


940 


50 




NA 


NA 


NA 




360 


490 


810 


1190 



For SI units, 1 in. = 25.4 mm, 1 in.'"^ = 645 mm'^, 1 ft = 0.305 m, 1000 Btu per hr = 0.293 kW. 
Note: See Figure G.l(f) and Section 13.2. 
[NFPA 54 Table 13.2(e)] 



Table 5-19 Exterior Masonry Chimney 



Number of Appliances: 



Appliance Type: 



Appliance Vent Connection: 



Two or More 



NAT + NAT 



l>pe B Doubie-Wall 
Connector 



SPECIAL USE: Combined Appliance Maximum Input Ratii^ in Thousands of Btu per Hour 



Vent 
Hei^t 








Internal Area of Chimney (in 


.') 








H 


















(ft) 


12 


19 


28 


38 


50 


63 


78 


113 


6 


25 


46 


71 


103 


143 


188 


246 


NA 


8 


28 


.53 


82 


119 


163 


218 


278 


408 


10 


31 


56 


90 


131 


177 


236 


302 


4.54 


15 


NA 


67 


106 


152 


212 


283 


565 


546 


20 


NA 


NA 


NA 


NA 


NA 


325 


419 


648 


30 


NA 


NA 


.NA 


.NA 


NA 


NA 


496 


749 


50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


922 


100 


NA 


N.4 


NA 


NA 


NA 


NA 


N.A. 


NA 



For SI units, 1 in. = 25.4 ram, 1 in.'^ = 645 mm^, 1 ft = 0.305 m, 1000 Btu per hr = 0.293 kW. 
[NFPA 54 Table 13.2(f)] 



82 



WATER HEATERS 



Table 5-20 



Table 5-20 Exterior Masomy Chimney 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Number of Appliances: 



Appliance Type: 



Appliance Vent Connection: 



Two or More 



NAT + NAT 



Type B Double-Wall 
Connector 





SPKCIAL LSK 


Minimum 


Allo^^able Inpiu Rating ol' Space-Heating Appliance in 
Internal Area of Chimney (in.^) 


Thousands of Btu 


per Ho lu- 




Vent 
Height 






H 

(ft) 


12 


19 


28 


38 


50 


63 


78 


113 








Local 99% winter design t 


unperature: 37°F or greater 






6 


. 




















NA 


8 


























10 


























15 


NA 























20 


NA 


NA 


NA 


NA 


NA 


184 








30 


■ NA 


NA ■ 


NA 


NA 


NA 


393 


334 





50 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


579 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 








Local 99% 


winter design temperature: 27°F 


to 36°F 






6 








68 


NA 


NA 


180 


212 


NA 


8 








82 


NA 


NA 


187 


214 


263 


10 





51 


NA 


NA 


NA 


201 


225 


265 


15 


NA 


NA 


NA 


NA 


NA 


253 


274 


305 


20 


NA . 


NA 


NA 


NA 


NA 


307 


330 


362 


30 


NA 


NA 


NA 


NA 


NA 


NA 


445 


485 


50 


NA 


NA 


■ NA 


NA 


NA 


NA 


NA 


763 


100 


NA 


NA 


NA 


NA 


NA. 


NA 


.NA 


NA 








Local 99% 


winter design 


temperature: 17'F 


to 2(5*F 






6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


8 


NA 


NA 


NA 


NA 


NA. 


NA 


204 


352 


10 


NA 


NA 


NA 


NA 


NA 


NA 


278 


358 


15 


NA 


NA 


NA 


NA 


NA 


NA 


331 


398 


20 


NA 


NA 


NA 


NA 


NA 


NA. 


387 


457 


30 


NA. 


NA 


NA 


NA 


NA 


NA 


NA 


581 


50 


■ NA 


NA 


NA 


NA 


NA 


NA 


NA 


862 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 








Local 99% 


winter design 


temperature: 5°F 


toie^F 






6 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


8 


NA 


NA 


NA 


NA 


NA 


NA. 


NA 


NA 


10 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


430 


15 


NA 


NA 


NA 


NA 


.NA 


NA 


NA. 


485 


20 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


547 


30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


682 


. 30 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


NA 








Local 99% 


winter design temperauire: 4"F or lower 












Not recommended for 


any vent configurations 







For SI units, I in. = 25.4 mm, 1 in.''' - 645 mm'^ 1 ft = 0.305 m, 1000 Bui per hr = 0.293 kW, "C = (°F ~ 32)/1.8. 
Note: See Figure 5-13 for a map showing local 99 percent winter design temperatures in the United States. 
[NFPA 54 Table 13.2(g)] 



83 



Table 5-21 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 5-21 Exterior Masonry Chimney 








Number of Appliances: 


Two or More 




^pliance Type: 


FAN + NAT 




Appliance Vent Connection: 


Type B Double-WaU 
Connector 



SPECIAL L'SE: Combined Appliance Maximum Input Rating in Thousands of Btu per Hour 



Vent 
Hei^t 








Internal Area of 


Chimney (in.^) 








H 


















(ft) 


12 


19 


28 


38 


50 


63 


78 


113 


6 


74 


119 


178 


257 


351 


458 


582 


853 


8 


80 


130 


193 


279 


384 


501 


636 


937 


10 


84 


138 


207 


299 


409 


538 


686 


1010 


15 


NA 


152 


233 


334 


467 


611 


781 


1156 


20 


NA 


NA 


250 


368 


508 


668 


858 


1286 


30 


NA 


NA 


NA 


404 


564 


74:7 


969 


1473 


50 


NA 


NA 


NA 


NA 


NA 


831 


1089 


1692 


100 


NA 


NA 


NA 


NA 


NA 


NA 


NA 


1921 



For SI units, 1 in. = 25.4 rnin, 1 in." = 645 min^, 1 ft = 0.305 in, 1000 Btu per hr 

[NFPA 54 Table 13.2(h) j 



■■ 0.293 kW. 



84 



WATER HEATERS 



Table 5-22 



Table 5-22 Exterior Masonry Chimney 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Number of Appliances: 



Appliance Type: 



Appliance Vent Connection: 



Two or More 



Type B Double-Wall Connector 





SPKCL\L L'SK: Minimum Allnwahtc Input Rating 


of Space-Ileating Appliance at tttousaiids of Stii 


perHour 




Vent 
Hei^t 


Internal Area of Chimney <in.*) 


H 






















(ft) 


12 


19 


28 




S8 


50 




63 


78 


113 


6 








Local 99% %viriter design temperature: S7°F oi 



greater 










8 






























10 






























. 15 


NA 



























20 


NA 


NA 


123 




190 


249 




184 








30 


NA 


NA 


NA 




334 


398 




393 


334 ' 





50 


NA 


NA 


NA 




NA 


NA 




714 


707 


579 


100 


NA 


NA 


NA 




NA 


NA 




NA 


NA 


1600 


6 








Local 99% 
68 


winter design 
116 


tempcratwre: 27''F to 36°F 
156 


180 


212 


266 


8 








82 




127 


167 




187 


214 


263 


10 





51 


97 




141 


183 




210 


225 


265 


15 


NA 


111 


142 




183 


233 




253 


274 


305 


20 


NA 


NA 


187 




230 


284 




307 


330 


362 


30 


NA 


NA 


NA 




330 


319 




419 


445 


485 


SO 


NA 


NA 


NA 




NA 


NA 




672 


705 


763 


100 


NA 


NA 


NA 




NA 


NA 




NA 


NA 


1554 


6 





55 


lx)cal 99% 
99 


winter design temperature: 17°F to 26°F 
141 182 


215 


259 


349 


8 


52 


74 


111 




154 


197 




226 


264 


352 


10 


NA 


90 


125 




169 


214 




243 


278 


358 


15 


NA 


NA 


167 




212 


263 




296 


331 


398 


20 


NA 


NA. 


212 




258 


316 




352 


387 


457 


80 


NA 


NA 


NA 




362 


429 




470 


507 


581 


50 


NA 


NA 


NA 




NA 


NA 




723 


766 


862 


100 


NA 


NA 


NA 




NA 


NA 




NA 


NA 


1669 


6 


NA 


78 


121 


Local 99% 


winter design tenjpej'aiure: 5°F to 16°F 
166 214 


252 


301 


416 


8 


NA 


94 


135 




182 


230 




269 


312 


423 


10 


NA 


111 


149 




198 


250 




289 


331 


430 


15 


NA 


NA 


19S 




247 


305 




346 


393 


485 


20 


NA 


NA 


NA 




293 


360 




408 


450 


547 


m 


NA 


NA 


NA 




377 


450 




581 


580 


682 


50 


NA 


NA 


NA. 




NA 


. NA 




797 


853 


972 


100 


NA 


NA 


NA 




NA 


NA 




NA 


NA 


1833 


6 


NA 


NA 


Local 99% 
145 


winter design 
196 


temperature; -WF 
249 


to4<'F 


296 


348 


484 


8 


NA 


NA 


159 




213 


269 




320 


371 


494 


10 


NA 


NA 


175 




231 


292 




839 


397 


513 


15 


NA 


NA 


NA 




283 


351 




404 


457 


586 


20 


NA 


NA 


NA 




333 


408 




468 


528 


650 


30 


NA 


NA 


NA 




NA 


NA 




603 


667 


805 


50 


NA 


NA 


NA 




NA 


NA. 




NA 


965 


1003 


100 


NA 


NA 


NA 




NA 


NA 




NA 


NA 


NA 




Local 99% vwntcr design, temperature: -ll^F or lower 
Not recommended for any vent configurations 



For SI units, 1 in. = 25.4 mm, 1 in.^ = 645 mni^ 1 ft = 0.305 in, 1000 Btu per hr = 0.293 kW. 

Note: See Figxire C.2.4 for a map showing local 99 percent winter design temperatures in the United States, 

[NFPA54Tablel3.2(i)] 



85 



Figure G.1 (a) -G.1(cl) 



UNIFORM PLUMBING CODE 



PART II 

This is originally from NFPA 54, Annex G 

which contains additional references from the UPC. 

Sizing of Venting Systems Serving Appliances 
Equipped with Draft Hoods, Category I 
Appliances, and Appliances Listed for Use 
with Type B Vents 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



G.l E>iampiesU^i^Siii^eAppIia]K:eVentinglkbIes.SeeFig- 

ure G.l (a) through Figure G.l (n) . 



Vent cap-^-clZJ 



dout^s-watt - 
988 vent 



\< L- 




u 



Tile-Bneci masonry - 
dilmney 



^ 




lypoBdoutte-ViiaiS 
gas^ffintusetlas-{ 
c(OTnector 



Table 5-8 is used when sizing Type B double-wall 
gas vent connected directly to the appliance. 

Note: The appliance can be either Category I draft- 
hood-equipped or fen-assisted type. 

HGURE G.l(a) l^pe B DoubIe-\^li Vmt System Serving a 
Sing^ Appliance With a l^pe B Double-Wyi Vent 



Table S-10 is used when sizing a Type B double-wall gas 
vent connector attached to a tile-lined masonry chimney 

Notes: 

1. 4 is the equivalent cross-sectional area of the tile liner. 

2. Hie appliance can be either Category i draft-hood- 
equipped or fan-assisted type. 

FIGU!(£G.l(c) \^tS^|staiiServin|;aSiii|^A{^lia]K%Witha 
Masomy C3iiimiey ami a "1^ B Doul^\^yQi ^;bit Coanect<» 



Vent cap— 

TypsB 
double-wail - 
gas vent 








1 






• 


Tlie-lined masonry — »- 
chimney 












H 


1 
H 


\ 






Single-wall — *■( 
vent connector 












A 


• 






- & 










s— 








1 





Table 5-9 is used when sizing a single-wall metal vent 
connector attached to a Type B double-wait gas vent. 

Note: The appliance can be either Category I draft- 
hood-equipped or fan-assisted type. 

FIGURE G.l<b) lype B Dooble-mU Vent System Serving . 
Sfai^ Appliance With a Sii^e-Myi Metal Vent Cktonecton 



Table 5-11 is used when sizing a single-wall vent 
connector attached to a tile-lined masonry chimney. 

Notes: 

1. 4 is the equivalent cross-sectional area of the tile liner. 

2. The appliance can be either Category I draft-hotxi- 
equipped or fen-assisted type. 

FIGURE G.l(d) \^ System Smfaig a Single A|qdianceUat% 
a Masomy Qilmney and a r 



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86 



WATER HEATERS 



Figure G.1(e)-G.1(h) 



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Vent cap 



Vent cap 





Asbestos cement Type B or single-wall metal vent 
serving a single draft-hood-equipped appliance. 
(See Table 5-12) 

fIGURE G.l(e) Asbest<» C^otent lype B or Sing^e-^Myi 
Metal Vent %stem Service a Sinj^e Draft-Hood-Equipped 
AppHance. 



Table 5-15 is used when sizing single-wall vent 
connectors attached to a Type B double-wall 
common vent. 

Note: Each appliance can be either Category I draft- 
hood-equipped or fan-assisted type. 

FIGURE G.l(g) Vent System Serving Two or More^pE- 
tmces WiQi Type B Double-mil Vent and Sing|e>WUl Metal 
Vent Connectors. 



Vent cap 




"*— Tile-lined masonry 



Types 
double-\rall 
gas vent used 
as connectors 




Table 5-14 is used when sizing Type B double-wall 
gas vent connectors attached to a Type B double- 
wall common vent. 

Note: Each appliance can be either Category I draft- 
hood-equlpped or fan-assisted type. 

FIGURE G.l (f) VentSystem Servinf IWo or More Appliances 
Wittt Type B Double-mU Vent and l^pe B Double-V/kU Vent 
Connef^rs. 



Table 5-16 is used when sizing Type B double-wall vent 
connectors attached to a tile-lined masonry chimney. 

Notes: 

1. A is the equivalent cross-sectional area of the tile liner. 

2. Each appliance can be either Category I draft-hood- 
equipped or fen-assisted type. 

FIGURE G.l (h) MasoniyChinmey Serving tWo or More 
A|>p]iances With Type B Double»\^yi Vent Connectors. 



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87 



Table G.1(i) -Table G. 1(1) 



UNIFORM PLUMBING CODE 



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J, Single-wali vent 
" connector 

1 




-Tile-lined masonry 
chimney 




TaUe 5-17 is used when sizing singie-wall metal vent 
conn«:tors attached to a tlle'lined masonry chimney. 

Notes: 

1 . ^ is tiie equivalent cross-sectional area of the tiie liner. 

2. Each appliance can i>e either Category I draft - 
hood-equipped or ^-assisted type. 

FIGURE G.l <i) Masomy Chinm^ Serving IWo or More 
.^pliatices with Sii^te-\i^ Metal Vent Connectors. 



Vent cap 




Example: htenif otded common vent connector Lu can 
ba no greater than 18 times the common vent connector 
manifold inside diameter; that is, a 4 in. (100 mm) inside 
diameter common vent connector manifold should not 
^ceed 72 in. (1800 mm) in length. 

Note: This is an illustration of a typical manifolded \«nt 
connector. Different appliance, vent connector, or 
common vent types are possible. 

F[GUIt£G.l(k) Use of Manifolded Cknnmon Vent Connector. 



Vent cap 




Asbestos cement Type B or single-wall metal pipe vent 
serving two or more draft-hood-equipped appliances. 
(See TaUe 5-18 ) 

flGUREG.lQ) Asbestos Cement lypeB or Sin^e-Wall Metal 
Vent System Servii^r Tivo or More Draft-Hood-ik[uipped Ap- 
pliances. 



Example: Offset common vent 

Note: This is an illustration of a typical offset vent. 
Different appliance, vent connector, or vent types are 



FIGURE G.1<1) Use of Offset Common Vent. 



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88 



WATER HEATERS 



G.1.1 -G 1.2 



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G.1.1 Example 1: Single Draft-Hood-Equipped 
Appliance. An installer has a 120,000-Btu/h input 
appliance with a 5-inch diameter draft hood outlet 
that needs to be vented into a 10-foot-high Type B 
vent system. What size vent should be used assuming 
(1) a 5-foot lateral single-wall metal vent connector is 
used with two 90-degree elbows or (2) a 5-foot lateral 
single-wall metal vent connector is used with three 90- 
degree elbows in the vent system? See Figure G.1.1. 

Solution 

Table 5-9 should be used to solve this problem 
because single-wall metal vent connectors are being 
used with a Type B vent, as follows; 

(1) Read down the first column in Table 5-9 until the 
row associated with a 10-foot height and 5-foot 
lateral is found. Read across this row until a 
vent capacity greater than 120,000 Btu/h is 
located in the shaded columns labeled NAT Max 
for draft-hood-equipped appliances. In this case, 
a 5-inch-diameter vent has a capacity of 122,000 
Btu/h and can be used for this application. 

(2) If three 90-degree elbows are used in the vent 
system, the maximum vent capacity listed in the 
tables must be reduced by 10 percent (see NFPA 
54:13.1.3). This implies that the 5-inch-diameter 
vent has an adjusted capacity of only 110,000 



Vent connector Tee 



u 




Tee same size as 
segment above 



Common vent size 

based on ail inputs * 

entering this segment 
and available total height 



Total input- 



e^ 



Rise 



^ 



an 



Available total 
height H equals 
rise plus distance 
between tees 



Tee same 
j^ size as 
segment 
atiove 



Btu^r 
input 



Increase «3^ 
vent i 

connector T 
size if I 

necessary Other inputs 
from below 



Vent connector size 
depends on: 

• Input 

• Rise 

• Available total height H 

• Table 5-14 connectors 



Common vent size 
depends on: 

• Combined inputs 

• Available total height H 

• Table 5-14 common vent 



Btu/h. In this case, the vent system must be 
increased to 6 inches in diameter. See the 
following calculations: 

122,000 X 0.90 = 110,000 for 5-inch vent 
From Table 5-10, select 6-inch vent. 
186,000 X 0.90 = 167,000 

This figure is greater than the required 
120,000. Therefore, use a 6-inch vent and 
connector where three elbows are used. 

G.1.2. Example 2; Single Fan-Assisted Appliance. 
An installer has an 80,000 Btu/h input fan-assisted 
appliance that must be installed using 10 feet of 
lateral connector attached to a 30-foot high Type B 
vent. Two 90 -degree elbows are needed for the 
installation. Can a single-wall metal vent cormector 
be used for this application? See Figure G.1.2. 

Solution 

Table 5-9 refers to the use of single-wall metal vent 
connectors with Type B vent. In the first column 
find the row associated with a 30-foot height and a 
10-foot lateral. Read across this row, looking at the 



Use individual vent tortop-fioor 
appliance if connector 
reqaimment for rise or total 
height cannot be met 



Use vent 
connector i 
table 



Listed cap 



Top-floor- 
appliance 




Use available total 
height for top-floor 
appliance and 
combined input of 
all appliances on 
common vent 



Third interconnection tee" 



Availat^e total height 
for third-floor appliance 
and combined input of 
three appliances 
(if lop-floor appliance 
is not connected, 
measure total 
height to vent top) 

.Second interconnection 
lee* 

Use available total 
height for second-floor 
ippliance and combined 
heat input of two 



Rrst interconnection tee* 



Design vent connector for 
first-floor appliance as an 
individual vent of this total 
height for input of first- 
floor appliance 



FIGURE G.l(m) Muldstoiy Gas Vent Design Procedure for 
Each Segment of System. 



* Each interconnection tee is same size as 
s^ment of common vent directly above 



FIGURE G.I(o) Principles of Design of Multistory Vents 
Uao^ Vent Connector and Common Vent Design Tables. 



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89 



G.1.2-G.2.1 



UNIFORM PLUMBING CODE 



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FAN Min and FAN Max columns, to find that a 3- 
inch diameter single-wall metal vent connector is not 
recommended. Moving to the next larger size single- 
wall connector (4 inch), we find that a 4-inch 
diameter single-wall metal connector has a 
recommended maximum vent capacity of 144,000 
Btu/h. The 80,000 Btu/h fan-assisted appliance is 
outside this range, so the conclusion is that a single- 
wall metal connector could be used to vent the 
appliance. Table 5-9 shows the acceptable range of 
vent capacities for a 4 inch vent with 5 feet of lateral 
to be between 72,000 Btu/h and 157,000 Btu/h. 

If the appliance cannot be moved closer to the 
vertical vent, then a Type B vent could be used as the 
connector material. In this case. Table 5-8 shows 
that, for a 30-foot-high vent with 10 feet of lateral, 
the acceptable range of vent capacities for a 4-inch- 
diameter vent attached to a fan-assisted appliance is 
between 37,000 Btu/h and 150,000 Btu/h. 

G.1.3. Example 3: Interpolating Between Table 
Values. An installer has an 80,000 Btu/h input 
appliance with a 4-inch diameter draft hood outlet that 
needs to be vented into a 12-foot-high Type B vent. 
The vent connector has a 5-ft. lateral length and is also 
Type B. Can this appliance be vented using a 4-inch 
diameter vent? 

Solution 

Table 5-8 is used in the case of an all Type B Vent 
system. However, since there is no entry in Table 5-8 
for a height of 12 feet, interpolation must be used. 
Read down the 4-inch diameter NAT Max column to 
the row associated with a 10-foot height and 5-foot 
lateral to find the capacity value of 77,000 Btu/h. 
Read further down to the 15-foot height, 5-foot 
lateral row to find the capacity value of 87,000 
Btu/h. The difference between the 15-foot height 
capacity value and the 10-foot height capacity value 
is 10,000 Btu/h. The capacity for a vent system with 
a 12-foot height is equal to the capacity for a 10-foot 
height plus 2/5 of the difference between the 10-foot 
and 15-foot height values, or 77,000 + 2/5 x 10,000 = 
81,000 Btu/h. Therefore, a 4-inch diameter vent can 
be used in the installation. 

G.2 Examples Using Common Venting Tables. 

G.2.1 Example 4: Common Venting Two Draft-Hood- 
Equipped Appliances. A 35,000-Btu/h water heater is 
to be common vented with a 150,000 Btu/h furnace, 
using a common vent with a total height of 30 feet. 
The connector rise is 2 feet for the water heater with a 
horizontal length of 4 feet. The connector rise for the 
furnace is 3 feet with a horizontal length of 8 feet. 
Assume single-wall metal connectors will be used 
with Type B vent. What size connectors and 
combined vent should be used in this installation? 



TypeB 
double-wall ■ 
gas vent 



q~3 



1R^ 




>/ 



10ft 



Single-wall 
connecstor 



Draft hood- 
equipped appliance 
120,000-Btu/hr Input 



For SI units, 1 ft = 0.305 m. 

FIGURE G.1.1 Sin^e Draft Hood-Equipped Appliance 
Example I. 



30ft 




For SI units, 1 ft = 0.305 m. 
FIGURE G.I.2 Sin^e Fan-Assisted Appliance — Example 2. 



, Combined capacity 

•;:j^ 35,000 + 150.C 

185,000 Btu/hr 

-♦—Type B double- 
wall gas vent 




Draft hood- 
equipped 
water heater 
35.000 Btu/hr 
input 



Draft hood- 
equipped furnace 
150.000 Btu/hr 

input 



FIGURE G.2. 1 Common Venting Two Draft Hood-Equipped 
Appliances — Example 4. 



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90 



WATER HEATERS 



G.2.1 -G.2.2 



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See Figure G.2.1. 

Solution 

Table 5-15 should be used to size single-wall 
metal vent connectors attached to Type B vertical 
vents. In the Vent Connector Capacity portion of 
Table 5-15, find the row associated with a 30-foot 
vent height. For a 2-foot rise on the vent connector 
for the water heater, read the shaded columns for 
draft-hood-equipped appliances to find that a 3-inch 
diameter vent connector has a capacity of 37,000 
Btu/h. Therefore, a 3-inch single-wall metal vent 
cormector can be used with the water heater. For a 
draft-hood-equipped furnace with a 3-foot rise, read 
across the appropriate row to find that a 5-inch- 
diameter vent connector has a maximum capacity of 
120,000 Btu/h (which is too small for the furnace), 
and a 6-inch diameter vent connector has a 
maximum vent capacity of 172,000 Btu/h. Therefore, 
a 6-inch diameter vent connector should be used 
with the 150,000 Btu/h furnace. Since both vent 
connector horizontal lengths are less than the 
maximum lengths listed in Table 5-8, the table values 
can be used without adjustments. 

In the Common Vent Capacity portion of Table 
5-15, find the row associated with a 30-foot vent 
height and read over to the NAT + NAT portion of 
the 6-inch diameter column to find a maximum 
combined capacity of 257,000 Btu/h. Since the two 
appliances total only 185,000 Btu/h, a 6-inch 
common vent can be used. 

G.2.2 Example 5 (a): Common Venting a Draft- 
Hood-Equipped Water Heater with a Fan-Assisted 
Furnace into a Type B Vent. In this case, a 35,000- 
Btu/h input draft-hood-equipped water heater with a 
4-inch diameter draft hood outlet, 2-feet of connector 
rise, and 4-feet of horizontal length is to be common 
vented with a 100,000 Btu/h fan-assisted furnace 
with a 4-inch diameter flue collar, 3-feet of connector 
rise, and 6-feet of horizontal length. The common 
vent consists of a 30-foot height of Type B vent. What 
are the recommended vent diameters for each 
connector and the common vent? The installer would 
like to use a single-wall metal vent connector. See 
Figure G.2.2. 

Solution (See Table 5-15) 

Water Heater Vent Connector Diameter. Since 
the water heater vent cormector horizontal length of 
4 feet is less than the maximum value listed in Table 
5-15, the venting table values can be used without 
adjustment. Using the Vent Connector Capacity 
portion of Table 5-15, read down the Total Vent 
Height (H) column to 30 feet and read across the 2- 
feet Connector Rise (R) row to the first Btu/h rating 



Combined capacity 
35,000+100,000 = 
135,000 Btuilir 



Type B 
-double-wall 
gas vent 30 ft 




For SI units, 1000 Btu/hr = 0.293 kW, 1 ft = 0.305 m. 

FIGURE G.2.2 Common Venting a Draft Hood-Equipped 
Water Heater with a Fan-Asristed Furnace into a Type B 
Double-WaU Common Vent — Example 5<a). 

TABLE G.2.3 

Masonry Chimney Liner Dimensions with Circular 

Equivalents 







Inside 






Inside 


Diameter 




Nominal Dimensions 


or Equivalent 


Equivalent 


Liner Size of Liner 


Diameter 


Area 


(in.) 


(in.) 


(in.) 


(in.^) 


4x8 


2-1/2x6-1/2 


4.0 


12.2 






5.0 


19.6 






6.0 


28.3 






7.0 


38.3 


8x8 


6-3/4 x 6-3/4 


7.4 


42.7 






8.0 


50.3 


8x12 


6-1/2x10-1/2 


9.0 


63.6 






10.0 


78.5 


12x12 


9-3/4 X 9-3/4 


10.4 


83.3 






11.0 


95.0 


12x16 


9-1/2x13-1/2 


11.8 


107.5 






12.0 


113.0 






14.0 


153.9 


16x16 


13-1/4x13-1/4 


14.5 


162.9 






15.0 


176.7 


16x20 


13x17 


16.2 


206.1 






18.0 


254.4 


20x20 


16-3/4 X 16-3/4 


18.2 


260.2 






20.0 


314.1 


20x24 


16-1/2x20-1/2 


20.1 


314.2 






22.0 


380.1 


24x24 


20-1/4x20-1/4 


22.1 


380.1 






24.0 


452.3 


24x28 


20-1/4x24-1/4 


24.1 


456.2 


28x28 


24-1/4x24-1/4 


26.4 


543.3 






27.0 


572.5 


30x30 


25-1/2x25-1/2 


27.9 


607.0 






30.0 


706.8 


30x36 


25-1/2x31-1/2 


30.9 


749.9 






33.0 


855.3 


36x36 


31-1/2x31-1/2 


34.4 


929.4 






36.0 


1017.9 



For SI units, 1 in. = 25.4 mm, 1 in.^ = 645 mirf. 
Note: When liner sizes differ dimensionally from those shown in this 
table, equivalent diameters can be determined from published tables for 
square and rectangular ducts of equivalent carrying capacity or by 
other engineering methods. 



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91 



G.2.2-G.2.4 



UNIFORM PLUMBING CODE 



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in the NAT Max column that is equal to or greater 
than the water heater input rating. The table shows 
that a 3-inch vent connector has a maximum input 
rating of 37,000 Btu/h. Although this rating is 
greater than the water heater input rating, a 3-inch 
vent connector is prohibited by Section 511.1.1(5). A 
4-inch vent connector has a n\axin\um input rating of 
67,000 Btu/h and is equal to the draft hood outlet 
diameter. A 4-inch vent connector is selected. Since 
the water heater is equipped with a draft hood, there 
are no minimuni input rating restrictions. 

Furnace Vent Connector Diameter. Using the Vent 
Connector Capacity portion of Table 5-15, read down 
the Total Vent Height (H) column to 30 feet and 
across the 3-foot Connector Rise (R) row. Since the 
furnace has a fan-assisted combustion system, find 
the first FAN Max column with a Btu/h rating 
greater than the furnace input rating. The 4-inch 
vent connector has a maximum input rating of 
119,000 Btu/h and a minimum input rating of 85,000 
Btu/h. 

The 100,000-Btu/h furnace in this example falls 
within this range, so a 4-inch connector is adequate. 
Since the furnace vent connector horizontal length of 
6 feet is less than the maximum value listed in Table 
5-8, the venting table values can be used without 
adjustment. If the furnace had an input rating of 
80,000 Btu/h, then a Type B vent connector would be 
needed in order to meet the minimum capacity limit, 
(see Table 5-14) 

Common Vent Diameter. The total input to the 
common vent is 135,000 Btu/h. Using the Common 
Vent Capacity portion of Table 5-15, read down the 
Vent Height (H) column to 30 feet and across this 
row to find the smallest vent diameter in the FAN + 
NAT column that has a Btu/h rating equal to or 
greater than 135,000 Btu/h. The 4-inch common 
vent has a capacity of 132,000 Btu/h and the 5-inch 
common vent has a capacity of 202,000 Btu/h. 
Therefore, the 5-inch common vent should be used in 
this example. 

Summary: In this example, the installer can use a 4- 
inch diameter, single-wall metal vent connector for 
the water heater and a 4-inch-diameter, single-wall 
metal vent cormector for the furnace. The common 
vent should be a 5-inch-diameter Type B vent. 

G.2.3 Example 5 (b): Common Venting into an 
Interior Masonry Chimney. In this case, the water 
heater and fan-assisted furnace of Example 5 (a) are 
to be common-vented into a clay-tile-lined masonry 
chimney with a 30-foot height. The chimney is not 
exposed to the outdoors below the roof line. The 
internal dimensions of the clay tile liner are 
nominally 8 inches x 12 inches. Assuming the same 
vent cormector heights, laterals, and materials found 



in example 5 (a), what are the recommended vent 

connector diameters, and is this an acceptable 

installation? 

Solution 

Table 5-17 is used to size common venting 

installations involving single-wall connectors into 

masonry chimneys. 

Water Heater Vent Connector Diameter. Using 
Table 5-17, Vent Connector Capacity, read down the 
Vent Height (H) column to 30 feet, and read across 
the 2-foot Connector Rise (R) row to the first Btu/h 
rating in the NAT Max column that is equal to or 
greater than the water heater input rating. The table 
shows that a 3-inch vent connector has a maximum 
input of only 31,000 Btu/h, while a 4-inch vent 
connector has a maximum input of 57,000 Btu/h. A 
4-inch vent connector must therefore be used. 

Furnace Vent Connector Diameter. Using the Vent 
Connector Capacity portion of Table 5-17, read down 
the total Vent Height (H) column to 30 feet and 
across the 3-feet Connector Rise (R) row. Because the 
furnace has a fan-assisted combustion system, find 
the first FAN Max column with a Btu/h rating 
greater than the furnace input rating. The 4-inch vent 
connector has a maximum input rating of 127,000 
Btu/h and a minimum input rating of 95,000 Btu/h. 
The 100,000 Btu/h furnace in this example falls 
within this range, so a 4-inch connector is adequate. 

Masonry Chimney. From Table G.2.3, the 
equivalent area for a nominal liner size of 8 inches x 
12 inches is 63.6 inchest Using Table 5-17, Common 
Vent Capacity, read down the FAN + NAT column 
under the Minimum Internal Area of Chimney value 
of 63 to the row for 30-foot height to find a capacity 
value of 739,000 Btu/h. The combined input rating 
of the furnace and water heater, 135,000 Btu/h, is 
less than the table value so this is an acceptable 
installation. 

Section 511.1.9 requires the common vent area to be 
no greater than seven times the smallest listed 
appliance categorized vent area, flue collar area, or 
draft hood outlet area. Both appliances in this 
installation have 4-inch-diameter outlets. From Table 
G.2.3, the equivalent area for an inside diameter of 4- 
inch is 12.2 in.l Seven times 12.2 equals 85.4,, which is 
greater than 63.6, so this configuration is acceptable. 

G.2.4 Example 5 (c): Common Venting into an 
Exterior Masonry Chimney. In this case, the water 
heater and fan-assisted furnace of Examples 5(a) and 
5(b) are to be common-vented into an exterior 
masonry chimney. The chimney height, clay-tile- 
liner dimensions, and vent connector heights and 
laterals are the same as in Example 5(b). This system 
is being installed in Charlotte, North Carolina. Does 
this exterior masonry chimney need to be relined? If 



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92 



WATER HEATERS 



G.2.4 



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SO, what corrugated metallic liner size is 
recommeiided? What vent connector diameters are 
recommended? See Table G.2.3 and Figure 5-13. 
Solution 

According to 511.2.18, Type B velit cormectors 
are required to be used with exterior masonry 
chimneys. Use Table 5-21 and Table 5-22 to size 
FAN+NAT common venting installations involving 
Type-B double-wall connectors into exterior 
masonry chimneys. 

The local 99 percent winter design temperature 
needed to use Table 5-21 and Table 5-22 can be found 
in the ASHRAE Handbook - Fundamentals. For Qiarlotte, 
North Carolina, this design temperature is 19°F. 

Chimney Liner Requirement. As in Example 5 (b), 
use the 63 tn.^ column of Table 5-21 to the 30 ft height 
row to find that the combined appliance maximum 
input is 747,000 Btu/h. The combined input rating 
of the appliance in this insta;llation, 135,000 Btu/h, is 
less than the maximum value, so this criterion is 
satisfied. Table 5-22, at a 19°F design temperature, 
and at the same vent height and internal area used 
earlier, shows that the minimum allowable input 
rating of a space-heating appliance is 470,000 Btu/h. 
The furnace input rating of 100,000 Btu/h is less than 
this minimum value. So this criterion is not satisfied, 
and an alternative venting design needs to be used, 
such as a Type B vent shown in Example 5(a) or a 
listed chimney liner system shov^m in the rest of the 
example. 

According to Section 511.1.6, Table 5-9 or Table 
5-10 are used for sizing corrugated metallic liners in 
masonry chimneys, with the maximum common 
vent capacities reduced by 20 percent. This example 
will be continued assuming T)rpe B vent connectors. 

Water Heater Vent Connector Diameter. Using 
Table 5-14 Connector Capacity, read down the total 
Vent Height (H) column to 30 feet, and read across 
the 2-foot Connector Rise (R) row to the first 
Btu/hour rating in the NAT Max column that is 
equal to or greater than the water heater input 
rating. The table shows that a 3 in. vent connector 
has a maximum capacity of 39,000 Btu/h. Although 
this rating is greater than the water heater input 
rating, a 3-inch vent connector is prohibited by 
511.1.6. A 4 in. vent cormector has a maximum input 
rating of 70,000 Btu/h and is equal to the draft hood 
outlet diameter. A 4-inch vent connector is selected. 

Furnace Vent Connector Diameter. Using Table 5- 
14, Vent Connector Capacity, read down the total 
Vent Height (H) column to 30 feet, and read across 
the 3-foot Connector Rise (R) row to the first Btu/h 
rating in the FAN MAX column that is equal to or 
greater than the furnace input rating. The 100,000 
Btu/h furnace in this example falls within this range, 
so a 4-inch connector is adequate. 



Chimney Liner Diameter. The total input to the 
common vent is 135,000 Btu/h. Using the Common 
Vent Capacity portion of Table 5-14, read down the 
total Vent Height (H) column to 30 feet and across 
this row to find the smallest vent diameter in the 
FAN + NAT column that has a Btu/h rating greater 
than 135,000 Btu/h. The 4 in. common vent has a 
capacity of 138,000 Btu/h. Reducing the maximum 
capacity by 20 percent (see 511.2.19) results in a 
maximum capacity for a 4-inch corrugated liner of 
110,000 Btu/h, less than the total input of 135,000 
Btu/h. So a larger liner is needed. The 5-inch 
common vent capacity listed in Table 5-14 is 210,000 
Btu/h, and after reducing by 20 percent is 168,000 
Btu/h. Therefore, a 5-inch corrugated metal liner 
should be used in this example. 

Single Wall Connectors. Once it has been 
established that relining the chimney is necessary. 
Type B double-wall vent connectors are not 
specifically required. This example could be redone 
using Table 5-15 for single-wall vent connectors. For 
this case, the vent connector and liner diameters 
would be the same as found for Type B double-wall 
connectors. 

The following is originally from NFPA 54, which 
contains additional reference. 

Example of Combination of Indoor and Outdoor 
Combustion and Ventilation Opening Design. 

J.l Example of Combination Indoor and Outdoor 
Combustion Air Opening. Determine the required 
combination of indoor and outdoor combustion air 
opening sizes for the following equipment 
installation example. 

Example Installation: A fan-assisted furnace and a 
draft-hood-equipped water heater with the following 
inputs are located in a 15-foot x 30-foot basement 
with an 8-foot ceiling. No additional indoor spaces 
can be used to help meet the equipment combustion 
air needs. 

Fan-Assisted Furnace Input: 100,000 Btu/h 

Draft-Hood-Equipped Water Heater Input: 

40,000 Btu/h 

Solution 

(1) Determine the total available room volume: 
Equipment room volim\e: 15 feet x 30 feet with an 
8-foot ceiling = 3,600 feet^ 

(2) Determine the total required volume: The standard 
method to determine combustion air will be 
used to calculate the required volume. 



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93 



G.2.4 



UNIFORM PLUMBING CODE 



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the basement is calculated as follows: 
100,000 Btu/h +40,000 Btu/h = 140,000 Btu/h 
The Standard Method requires that the required 
volume be determined based on 50 cubic feet per 
1,000 Btu/hour. Using Table A.9.3.2.1, the 
required volume for a 140,000 Btu/h water 
heater is 7,000 feet\ 

Conclusion: Indoor volume is insufficient to 
supply combustion air since the total of 3,600 feet^ 
does not meet the required volume of 7000 feet^. 
Therefore, additional combustion air must be 
provided from the outdoors. 

(3) Determine ratio of the available volume to the 

required volume: 
3,600 it' = 0.51 
7000 ft.^ 

(4) Determine the reduction factor to be used to 
reduce the full outdoor air opening size to the 
minimum required based on ratio of indoor 
spaces: 

1.00 - 0.51 (from Step 3) = 0.49 

(5) Determine the single outdoor combustion air 
opening size as if all combustion air is to come 
from outdoors. In this example, the combustion 
air opening directly communicates with the outdoors. 

140,000 Bhi/h= 47 in.^ 
3,000 Btu/in.' 

(6) Determine the minimum outdoor combustion 
air opening area: 

Outdoor opening area = 0.49 

(from Step 4) x 47 in.-= 23 in.' 
Section 507.3 requires the minimum dimension of the 
air opening should not be less than 3 inches. 



TABLE A.9.3.2.1 
Standard Method Volume, Ail Appliances 



Appliance Input 


Required Volume 


(Btu/h) 


(ft.^) 


5,000 


250 


10,000 


500 


15,000 


750 


20,000 


1,000 


25,000 


1,250 


30,000 


1,500 


35,000 


1,750 


40,000 


2,000 


45,000 


2,250 


50,000 


2,500 


55,000 


2,750 


60,000 


3,000 


65,000 


3,250 


70,000 


3,500 


75,000 


3,750 


80,000 


4,000 


85,000 


4,250 


90,000 


4,500 


95,000 


4,750 


100,000 


5,000 


105,000 


5,250 


110,000 


5,500 


115,000 


5,750 


120,000 


6,000 


125,000 


6,250 


130,000 


6,500 


135,000 


6,750 


140,000 


7,000 


145,000 


7,250 


150,000 


7,500 


160,000 


8,000 


170,000 


8,500 


180,000 


9,000 


190,000 


9,500 


200,000 


10,000 


210,000 


10,500 


220,000 


11,000 


230,000 


11,500 


240,000 


12,000 


250,000 


12,500 


260,000 


13,000 


270,000 


13,500 


280,000 


14,000 


290,000 


14,500 


300,000 


15,000 



507.4.1 See Figure 5-8 • 507.4.1(1) See Figure 5-9 and 
Figure 5-10 • 507.4.1(2) See Figure 5-11 • 507.4.2 See 
Figure 5-12 • For information on gas convenience 
outlets, see AGA 7-90, Requirements for Gas Convenience 
Outlets. 



94 



CHAPTER 6 

WATER SUPPLY AND DISTRIBUTION 



601.0 Running Water Required. 

601.1 Except where not deemed necessary for safety 
or sanitation by the Authority Having Jurisdiction, 
each plumbing fixture shall be provided with an 
adequate supply of potable running water piped 
thereto in an approved manner, so arranged as to 
flush and keep it in a clean and sanitary condition 
without danger of backflow or cross-connection. 
Water closets and urinals shall be flushed by means 
of an approved flush tank or flushometer valve. In 
jurisdictions that adopt Chapter 16, water closets, 
urinals, and trap primers in designated non- 
residential buildings may be provided with 
reclaimed water as defined and regulated by 
Chapter 16 of this code. 

Exception: Listed fixtures that do not require 
water for their operation and are not connected 
to the water supply. 

601.2 Identification of a Potable and Nonpotable 
Water System. In all buildings where potable water 
and nonpotable water systems are installed, each 
system shall be clearly identified. Each system shall 
be color coded as follows: 

601.2.1 Potable Water - Green background 
with white lettering. 

601 .2.2 Nonpotable Water - YeUow background 
with black lettering, with the words "Caution: 
Nonpotable water, do not drink." 

Each system shall be identified with a 
colored band to designate the liquid being 
conveyed, and the direction of normal flow shall 
be clearly shown. The minimum size of the 
letters and length of the color field shall conform 
to Table 6-1. 

A colored identification band shall be 
indicated every twenty (20) feet (6096 mm) but 
at least once per room, and shall be visible from 
the floor level. 

Where vacuum breakers or backflow 
preventers are installed with fixtures listed in 
Table 14-1, identification of the discharge side 
may be omitted. Each outlet on the nonpotable 
water line that could be used for special 
purposes shall be posted as follows: 

"Caution: Nonpotable water, do not drink." 

601.2.3 Reclaimed Water - Purple (Pantone 
color #512) background and shall be imprinted 
in nominal 1/2-inch (12.7 mm) high, black upper- 
case letters, with the words "Caution: Reclaimed 
water, do not drink." 



601.3 Faucets and diverters shall be connected to the 
water distribution system so that hot water 
corresponds to the left side of the fittings. 

TABLE 6-1 
Minimum Length of Color Field and Size of Letters 



Outside Diameter 


[\/linimum Lengtii 


Minimum Size 


of Pipe or 


Covering 


of Color Field 


of Letters 


inches 


(mm) 


Inches 


(mm) 


inches 


(mm) 


1/2 to 1-1/4 


(15 to 32) 


8 


(203) 


1/2 


(12.7) 


1-1/2 to 2 


(40 to 50) 


8 


(203) 


3/4 


(19.1) 


2-1/2 to 6 


(65 to 150) 


12 


(305) 


1-1/4 


(32) 


8 to 10 


(200 to 250; 


1 24 


(619) 


2-1/2 


(64) 


Over 10 


(Over 250) 


32 


(813) 


3-1/2 


(89) 



602.0 Unlawful Connections 

602.1 No installation of potable water supply piping 
or part thereof shall be made in such a maimer that it 
will be possible for used, unclean, polluted, or 
contaminated water, mixtures, or substances to enter 
any portion of such piping from any tank, receptor, 
equipment, or plumbing fixture by reason of back- 
siphonage, suction, or any other cause, either during 
normal use and operation thereof, or when any such 
tank, receptor, equipment, or plumbing fixture is 
flooded or subject to pressure in excess of the 
operating pressure in the hot or cold water piping. 

602.2 No person shall make a connection or allow one 
to exist between pipes or conduits carrying domestic 
w^ater supplied by any public or private w^ater service 
system, and any pipes, conduits, or fixtures 
containing or carrying water from any other source or 
containing or carrying water that has been used for 
any purpose whatsoever, or any piping carrying 
chemicals, liquids, gases, or any substances 
whatsoever, unless there is provided a backflow 
prevention device approved for the potential hazard 
and maintained in accordance with this code. Each 
point of use shall be separately protected when 
potential cross-contamination of individual units exists. 

602.3 No plumbing fixture, device, or construction 
shall be installed or maintained or shall be connected 
to any domestic water supply when such installation 
or connection may provide a possibility of polluting 
such water supply or may provide a cross- 
connection between a distributing system of water 
for drinking and domestic purposes and water that 



95 



602.3 - Table 6-2 



UNIFORM PLUMBING CODE 



may become contaminated by such plumbing 
fixture, device, or construction unless there is 
provided a backflow prevention device approved for 
the potential hazard. 

602.4 No water piping supplied by any private 
water supply system shall be connected to any other 
source of supply without the approval of the 
Authority Having Jurisdiction, Health Department, 
or other department having jurisdiction. 

603.0 Cross-connection Control. 

Cross-connection control shall be provided in ac- 
cordance with the provisions of this chapter. 

No person shall install any water-operated 
equipment or mechanism, or use any water-treating 



chemical or substance, if it is found that such 
equipment, mechanism, chemical, or substance may 
cause pollution or contamination of the domestic 
water supply. Such equipment or mechanism may be 
permitted only when equipped with an approved 
backflow prevention device or assembly. 

603.1 Approval of Devices or Assemblies. Before 
any device or assembly is installed for the prevention 
of backflow, it shall have first been approved by the 
Authority Having Jurisdiction. Devices or assemblies 
shall be tested for conformity with recognized stan- 
dards or other standards acceptable to the Authority 
Having Jurisdiction that are consistent with the 
intent of this code. 

All devices or assemblies installed in a potable 
water supply system for protection against backflow 







TABLE 6-2 
Backflow Prevention Devices, Assemblies, and Methods 




Degree of Hazard 




Device, 
Assembly, or 
Method' 


Pollution 
(Low Hazard) 


Contamination 
(High Hazard) 


Installation ^' 




Back Siphonage 


Back Pressure 


Back Siphonage 


Back Pressure 




Airgap 


X 




X 




See Table 6-3 in this chapter. 


Atmospheric 

Vacuum 

Breaker 


X 




X 




Upright position. No valve 
downstream. Minimum of six (6) 
inches (152 mm) or listed distance 
above all downstream piping and 
flood-level rim of receptor.^ ' 


1 Spill-Resistant 
Pressure-Type 
Vacuum 
Breaker 


X 


X 


X 




Upright position. Minimum of six 
(6) inces (152 rmn) or Usted 
distance above all downstream 
piping and flood-level rim of ' 
receptor.' 


Double Check 
Valve Backflow 
Preventer 


X 


X 






Horizontal, unless otherwise 
listed. Requires one (1) foot 
minimum clearance at bottom for 
maintenance. May need 
platform/ladder for test and 
repair. Does not discharge water. 


Pressure 
Vacuum 
Breaker 


X 




X 




Upright position. Mayhave 
valves downstream. Minimum of 
twelve (12) inches (305 mm) above 
all downstream, piping and flood- 
level rim of receptor. May 
discharge water. 


Reduced 
Pressure 
Principle ' 
Backflow 
Preventer 


X 


X 


X 


X 


Horizontal unless otherwise 
listed. Requires one (1) foot (305 
mm) minimum clearance at 
bottom for maintenance. May 
need platform ladder for test and 
repair. May discharge water. 



' See description of devices and assemblies in this chapter. 

^ Installation in pit or vault requires previous approval by the Authority Having Jurisdiction. 

^ Refer to general and specific requireirient for installation. 

" Not to be subjected to operating pressvire for more than 12 hours in any 24-hour period. 

' For deck-mounted and equipment-moimted vacuum breaker, see Section 603.4.15. 



96 



WATER SUPPLY AND DISTRIBUTION 



603.1 -Table 6-3 



shall be maintained in good working condition by 
the person or persons having control of such devices 
or assemblies. Such devices or assemblies shall be 
tested at the time of installation, repair, or relocation 
and at least on an annual schedule thereafter, or 
more often when required by the Authority Having 
Jurisdiction. If found to be defective or inoperative, 
the device or assembly shall be repaired or replaced. 
No device or assembly shall be removed from use or 
relocated or other device or assembly substituted, 
without the approval of the Authority Having 
Jurisdiction. 

Testing shall be performed by a certified 
backflow assembly tester. 

603.2 Backflow Prevention Devices, Assemblies, 
and l\/lethods. 

603.2.1 Airgap. The minimum airgap to afford 
backflow protection shall be in accordance with 
Table 6-3. 



603.2.2 Atmospheric Vacuum Breaker (AVB). 

An atmospheric vacuum breaker consists of a 
body, a checking member, and an atmospheric 
opening. 

603.2.3 Hose Connection Backflow Preventer. 

A hose connection backflow preventer consists of 
two independent check valves with an independent 
atmospheric vent between and a means of field 
testing and draining. 

603.2.4 Double Check Valve Backflow Preven- 
tion Assembly (DC). A double check valve 
backflow prevention assembly consists of 
two independently acting internally loaded check 
valves, four properly located test cocks, and 
two isolation valves. 

603.2.5 Pressure Vacuum Breaker Backflow 
Prevention Assembly (PVB). A pressure 
vacuum breaker backflow prevention assembly 
consists of a loaded air inlet valve, an internally 
loaded check valve, two (2) properly located test 



TABLE 6-3 
Minimum Airgaps for Water Distribution" 



Fixtures 


When not affected 
by sidewalls^ 
Inches (mm) 


When affected by 

sidewalP 

Inches (mm) 


Effective openings^ not greater 
than one-half (1/2) inch (12.7 mm) 
in diameter 


1 (25.4) 


1-1/2 (38) 


Effective openings^ not greater 
than three-quarters (3/4) inch 
(20 mm) in diameter 


1-1/2 (38) 


2-1/4 (57) 


Effective openings^ not greater 
than one (1) inch (25 mm) in 
diameter 


2 (51) 

■ 


3 (76) 


Effective openings' greater than 
one (1) inch (25 mm) in diameter 


Two (2) times 

diameter of 

effective opening 


Three (3) times 

diameter of 
effective opening 



' Sidewalls, ribs, or similar obstructions do not affect airgaps when spaced from the inside edge of the spout opening a distance 
greater than three times the diameter of the effective opening for a single wall, or a distance greater than four times the effective 
opening for two intersecting walls. 

^ Vertical walls, ribs, or similar obstructions extending from the water surface to or above the horizontal plane of the spout opening 
other than specified in Note 1 above. The effect of three or more such vertical walls or ribs has not been determined. In such cases, 
the airgap shall be measured from the top of the wall. 

' The effective opening shall be the minimum cross-sectional area at the seat of the control valve or the supply pipe or tubing that 
feeds the device or outlet. If two or more lines supply one outlet, the effective opening shall be the sum of the cross-sectional areas 
of the individual supply lines or the area of the single outlet, whichever is smaller. 

" Airgaps less than one (1) inch (25.4 mm) shall be approved only as a permanent part of a listed assembly that has been tested 
under actual backflow conditions with vacuums of to 25 inches (635 mm) of mercury. 



97 



603.2 - 603.4 



UNIFORM PLUMBING CODE 



cocks, and two (2) isolation valves. This device 
shall be installed indoors only if provisions for 
spillage are provided. 

603.2.6 Pressure Vacuum Breaker Spill- 
Resistant-Type Backflow Prevention 
Assembly (SVB). A pressure-type vacuum 
breaker backflow prevention assembly consists 
of one (1) check valve force-loaded closed and 
an air inlet vent valve force-loaded open to 
atmosphere, positioned downstream of the check 
valve, and located between and including two 
(2) tightly closing shutoff valves and test cocks. 

603.2.7 Reduced-Pressure Principle Backflow 
Prevention Assembly (RP). A reduced-pressure 
principle backflow prevention assembly consists 
of two independently acting internally loaded 
check valves, a differential pressure-relief valve, 
four properly located test cocks, and two 
isolation valves. 

603.3 General Requirements. 

603.3.1 All assemblies shall conform to listed 
standards and be acceptable to the Authority 
Having Jurisdiction, with jurisdiction over the 
selection and installation of backflow prevention 
assemblies. 

603.3.2 Where niore than one (1) backflow 
prevention valve is installed on a single premise, 
and the valves are installed in one location, each 
separate valve shall be permanently identified 
by the permittee in a manner satisfactory to the 
Authority Having Jurisdiction. 

603.3.3 The premise owner or responsible 
person shall have the backflow prevention 
assenrvbly tested by a certified backflow assembly 
tester at the time of installation, repair, or 
relocation and at least on an annual schedule 
thereafter, or more often when required by the 
Authority Having Jurisdiction. The periodic 
testing shall be performed in accordance with 
the procedures referenced in Table 14-1 by a 
tester qualified in accordance with those standards. 

603.3.4 Access and clearance shall be provided 
for the required testing, maintenance, and repair. 
Access and clearance shall require a minimum of 
one (1) foot (305 mm) between the lowest 
portion of the assembly and grade, floor, or 
platform. Installations elevated more than five 
(5) feet (1524 mm) above the floor or grade shall 
be provided with a permanent platform capable 
of supporting a tester or maintenance person. 

603.3.5 Direct connections between potable 
water piping and sewer-connected wastes shall 
not exist under any condition with or without 
backflow protection. Where potable water is 
discharged to the drainage system, it shall be by 
means of an approved airgap of two (2) pipe 



diameters of the supply inlet, but in no case shall 
the gap be less than one (1) inch (25 m.m). 
Connection may be made to the inlet side of a 
trap provided that an approved vacuum breaker 
is installed not less than six (6) inches (152 mm), 
or the distance according to the device's listing, 
above the flood-level rim of such trapped 
fixture, so that at no time will any such device 
be subjected to any back-pressure. 

603.3.6 Backflow preventers for hot water over 
110°F (43.3°C) shall be a type designed to op- 
erate at temperatures of 110°F (43.3°C) or more 
without rendering any portion of the assembly 
inoperative. 

603.3.7 Fixtures, appliances, or appurtenances 
with integral backflow preventers or integral 
airgaps manufactured as a unit shall be installed 
in accordance with their listing requirements 
and the manufacturers' instructions. 

603.3.8 In cold climate areas, backflow 
assemblies and devices shall be protected from 
freezing with an outdoor enclosure or by a i 
method acceptable to the Authority Having 
Jurisdiction. 

603.3.9 All drain lines serving backflow devices 
or assemblies shall be sized in accordance with 
the discharge rates of the manufacturers' flow 
charts of such devices or assemblies. 

603.3.10 Design and Installation of Plumbing 
Fixtures. Plum^bing fixtures shall be installed 
such that fixture fittings, complying with the 
backflow prevention requirements of ASME 
A112.18.1, do not have these requirements 
compromised by the designated fixture fitting 
mounting surface. 

603.4 Specific Requirements. 

603.4.1 Water closet and urinal flushometer 
valves shall be equipped with an atmospheric 
vacuum breaker. The vacuum breaker shall be 
installed on the discharge side of the flushometer 
valve with the critical level at least six (6) inches 
(152 mm), or the distance according to its listing, 
above the overflow rim of a water closet bowl or 
the highest part of a urinal. 

603.4.2 Water closet and urinal tanks shall be 
equipped with a ballcock. The ballcock shall be 
installed with the critical level at least one (1) 
inch (25.4 mm) above the full opening of the 
overflow pipe. In cases where the ballcock has no 
hush tube, the bottom of the water supply inlet 
shall be installed one (1) inch (25.4 mm) above 
the full opening of the overflow pipe. 

603.4.3 Water closet flushometer tanks shall be 
protected against backflow by an approved 
backflow prevention assembly, device, or method. 



98 



WATER SUPPLY AND DISTRIBUTION 



603.4 



603.4.4 Heat Exchangers. 

603.4.4.1 Heat exchangers used for heat 
trarisfer, heat recovery, or solar heating shall 
protect the potable water system from being 
contaminated by the heat transfer medium. 
Single-wall heat exchangers used in indirect- 
fired water heaters shall meet the require- 
ments of Section 506.4.2. Double-wall heat 
exchangers shall separate the potable water 
from the heat-transfer medium by providing 
a space between the two walls that is vented 
to tile atmosphere. 

603.4.5 Water supply inlets to tanks, vats, 
sumps, swimming pools, and other receptors 
shall be protected by one of the following 
means: 

(1) An approved airgap. 

(2) A listed vacuum breaker installed on the 
discharge side of the last valve with the 
critical level not less than six (6) inches (152 
mm) or in accordance with its listing. 

(3) A backflow preventer suitable for the 
contamination or pollution, installed in 
accordance with the requirements for that 
type of device or assembly as set forth in 
this chapter. 

603.4.6 Protection from Lawn Sprinklers and 
Irrigation Systems. 

603.4.6.1 Potable water supplies to systems 
having no piomps or coruiections for pumping 
equipment, and no chemical injection or 
provisions for chemical injection, shall be 
protected from backflow by one of the 
following devices: 

(1) Atmospheric vacuum breaker 

(2) Pressure vacuum breaker 

(3) Spill-resistant pressure vacuum breaker 

(4) Reduced-pressure backflow preventer 

603.4.6.2 Where sprinkler and irrigation 
systems have pumps, connections for pumping 
equipment, or auxiliary air tanks, or are 
otherwise capable of creating back-pressiire, the 
potable water supply shall be protected by 
the following type of device if the backflow 
device is located upstream from the source 
of back-pressure: 

(1) Reduced-pressure backflow preventer 

603.4.6.3 Where systems have a backflow 
device installed downstream from a potable 
water supply pump or a potable water supply 
pump connection, the device shall be one of 
the following: 

(1) Atmospheric vacuum breaker 

(2) Pressure vacuum breaker 



(3) Spill-resistant pressure vacuum breaker 

(4) Reduced-pressure backflow preventer 

603.4.6.4 Where systems include a chemical 
injector or any provisions for chemical injection, 
the potable water supply shall be protected 
by the following: 

(1) Reduced-pressure backflow preventer 

603.4.7 Potable water outlets with hose 
attachments, other than water heater drains, 
boiler drains, and clothes washer connections, 
shall be protected by a nonremovable hose-bibb- 
type backflow preventer, a nonremovable hose 
bibb-type vacuum breaker, or by an atmospheric 
vacuum breaker installed at least six (6) inches 
(152 mm) above the highest point of usage 
located on the discharge side of the last valve. In 
climates where freezing temperatures occur, a 
listed self-draining frost-proof hose bibb with an 
integral backflow preventer or vacuum breaker 
shall be used. 

603.4.8 Water-cooled compressors, degreasers, 
or any other water-cooled equipment shall be 
protected by a backflow preventer installed in 
accordance with the requirem.ents of this chapter. 
Note: 

Water-cooled equipment that produces back- 
pressure shall be equipped with the appropriate 
protection. 

603.4.9 Water inlets to water-supplied 
aspirators shall be equipped with a vacuum 
breaker installed in accordance with its listing 
requirements and this chapter. The discharge 
shall drain through an airgap. When the 
tailpiece of a fixture to receive the discharge of 
an aspirator is used, the airgap shall be located 
above the flood-level rim of the fixture. 

603.4.10 Potable water makeup connections to 
steam or hot water boilers shall be provided 
with a listed backflow protection assembly. 

603.4.11 Nonpotable Water Piping. In cases 
where it is impractical to correct individual 
cross-connections on the domestic waterline, the 
line supplying such outlets shall be considered a 
nonpotable water line. No drinking or domestic 
water outlets shall be connected to the non- 
potable waterline. Whenever possible, all 
portions of the nonpotable waterline shall be ex- 
posed, and all exposed portions shall be properly 
identified in a manner satisfactory to the 
Authority Having Jurisdiction. Each outlet on the 
nonpotable waterline that may be used for 
drinking or domestic purposes shall be posted: 
"Caution: Nonpotable water, do not drink." 

603.4.12 Potable water supply to carbonators 
shall be protected by either an airgap or a vented 



99 



603.4 



UNIFORM PLUMBING CODE 



backflow preventer for carbonated beverage 
dispensers installed within the carbonated 
beverage dispenser. The carbonated beverage 
dispenser shall bear the label of an approved 
testing agency, certifying and attesting that such 
equipment has been tested and inspected and 
meets the requirements of the approved 
applicable standard. Carbonated beverage 
dispensers without an approved internal airgap 
or vented backflow preventer for carbonated 
beverage dispensers and carbonated beverage 
dispensing systems shall have the water supply 
protected with a vented backflow preventer for 
carbonated beverage dispensers. 

603.4.13 Water Treatment Units. Reverse osmosis 
drinking water treatment units shall meet the 
requirements of the appropriate standards 
referenced in Table 14-1. Waste or discharge 
from reverse osmosis or other types of water 
treatment units shall enter the drainage system 
through an airgap. 

603.4.14 Backflow preventers shall not be 
located in any area containing fumes that are 
toxic, poisonous, or corrosive. 

603.4.15 Deck-mounted or equipment-mounted 
vacuum breakers shall be installed in accordance 
with their listing and the manufacturers' 
instructions, with the critical level not less than 
one (1) inch (25.4 mm) above the flood-level rim. 

603.4.16 Protection from Fire Systems. 

603.4.16.1 Except as provided under 
Sections 603.4.16.2 and 603.4.16.3, potable 
water supplies to fire protection systems 
that are normally under pressure, including 
but not limited to standpipes and automatic 
sprinkler systems, except in one- or two- 
family residential sprinkler systems, piped in 
materials approved for potable water 
distribution systems shall be protected from 
back-pressure and back-siphonage by one of 
the following testable devices: 

(1) Double check valve assembly 

(2) Double check detector assembly 

(3) Reduced pressure backflow preventer 

(4) Reduced pressure detector assembly 

Potable water supplies to fire protection 
systems that are not normally under 
pressure shall be protected from backflow 
and shall meet the requirements of the 
appropriate standards referencedin Table 14-1. 

603.4.16.2 Where fire protection systems 
supplied from a potable water system 
include a fire department (siamese) connec- 
tion that is located less than seventeen 



hundred (1,700) feet (518.2 m) from a non- 
potable water source that could be used by 
the fire department as a secondary water 
supply, the potable w^ater supply shall be 
protected by one of the following: 

(1) Reduced pressure backflow preventor 

(2) Reduced pressure detector assembly 

Note: 

Nonpotable water sources include fire 
department vehicles carrying water of 
questionable quality or water that is treated 
with antifreeze, corrosion inhibitors, or 
extinguishing agents. 

603.4.16.3 Where antifreeze, corrosion 
inhibitors, or other chemicals are added to a 
fire protection system supplied from a 
potable water supply, the potable water 
system shall be protected by one of the 
following: 

(1) Reduced pressure backflow preventer 

(2) Reduced pressure detector assembly 

603.4.16.4 Whenever a backflow device is 
installed in the potable water supply to a 
fire protection system, the hydraulic design 
of the system shall account for the pressure 
drop through the backflow device. If such 
devices are retrofitted for an existing fire 
protection system, the hydraulics of the 
sprinkler system design shall be checked to 
verify that there will be sufficient water 
pressure available for satisfactory operation 
of the fire sprinklers. 

603.4.16.5 Residential Sprinlcler Systems. 

When residential sprinkler systemis are 
installed using the potable water system, 
they shall be installed in accordance with 
the standards listed in Table 14-1. 

603.4.17 Special Equipment, Water Supply 
Protection. Vacuum breakers for washer-hose 
bedpans shall be located not less than five (5) 
feet (1,524 mm) above the floor. Hose connections 
in health care or laboratory areas shall not be less 
than six (6) feet (1,829 mm) above the floor. 

603.4.18 Portable cleaning equipment, dental 
vacuum pumps, and chemical dispensers shall 
be protected from backflow by an airgap, an 
atmospheric vacuum breaker, a spill-proof 
vacuum breaker, or a reduced pressure principle 
backflow preventer. 

603.4.19 Water Heater Connectors. Flexible 
metallic water heater connectors or reinforced 
flexible water heater connectors connecting 
water heaters to the piping system shall be in 



100 



WATER SUPPLY AND DISTRIBUTION 



603.4-604.13 



TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 



compliance with the appropriate standards 
listed in Table 14-1. 

60314.20 Combination stop-and-waste valves 
or cocks shall not be installed underground. 

603.4.21 Pure Water Process Systems. The 

water supply to a pure water process system, 
such as dialysis water systems, semiconductor 
washing systems, and similar process piping 
systems, shall be protected from back-pressure 
and back-siphonage by a reduced-pressure 
principle backflow preventer. 

603.4.21.1 Dialysis Water Systems. The 

individual connections of the dialysis 
related equipment to the dialysis pure water 
system do not require additional backflow 
protection. 

603.4.22 Plumbing Fixture Fittings. Plumbing 
fixture fittings with integral backflow protection 
shall comply with ASME A112.18.1. 

604:0 Materials. 

604.1 All pipe, tube, and fittings carrying water used 
in potable water systems intended to supply drinking 
water shall meet the requirements of NSF 61 as foimd 
in Table 14-1. All materials used in the water supply 
system, except valves and similar devices, shall be of 
a like material, except where otherwise approved by 
the Authority Having Jurisdiction. 

Materials for building water piping and building 
supply piping shall be in accordance with Table 6-4 
and the standards in Table 14-1. 

604.2 Copper tube for water piping shall have a 
weight of not less than Type L. 

Exception: Type M copper tubing may be used 
for water piping when piping is aboveground 
in, or on, a building or underground outside of 
structures. 

1604.3 All hard-drawn copper tubing for water supply 
and distribution in addition to the required incised 
marking, shall be marked in accordance with ASTM 
B 88 Seamless Copper Water Tube as listed in Table 14- 
1. The colors shall be: Type K, green; Type L, blue; 
Type M, red. 

604.4 Listed flexible copper water cormectors shall be 
installed in readily accessible locations, unless 
otherwise listed. 

604.5 Cast-iron fittings up to and including two (2) 
inches (51 mm) in size, when used in connection 
with potable water piping/shall be galvanized. 

604.6 All malleable iron water fittings shall be 
galvanized. 



604.7 Piping and tubing that has previously been used 
for any purpose other than for potable water systems 
shall not be used. 

604.8 Approved plastic materials may be used in 
water service piping, provided that where metal 
water service piping is used for electrical grounding 
purposes, replacement piping therefore shall be of 
like materials. 

Exception: Where a grounding system acceptable 
to the Authority Having Jurisdiction is installed, 
inspected, and approved, metallic pipe may be 
replaced with nonmetallic pipe. 

604.9 Solder shall conform to the requirements of 
Section 316.1.3. 

604.10 Water pipe and fittings with a lead content 
which exceeds eight (8) percent shall be prohibited in 
piping systems used to convey potable water. 

604.1 1 PEX. Cross-linked polyethylene (PEX) tubing 
shall be marked with the appropriate standard 
designation(s) listed in Table 14-1 for which the tubing 
has been approved. PEX tubing shall be installed in 
compliance with the provisions of this section. 

604.11.1 PEX Fittings. Metal insert fittings, 
metal compression fittings, and cold expansion 
fittings used with PEX tubing shall be 
manufactured to and marked in accordance with 
the standards for the fittings in. Table 14-1. 

604.11.2 Water Heater Connections. PEX 

tubing shall not be installed within the first 
eighteen (18) inches (457 mm) of piping 
connected to a water heater. 

604.12 Flexible Corrugated Connectors. Flexible 
corrugated connectors of copper or stainless steel 
shall be limited to the following connector lengths: 

Water Heater Connectors - twenty-four (24) 
inches (609 mm). 

Fixture Connectors - thirty (30) inches (762 mm). 

Washing Machine Connectors - seventy-two 
(72) inches (1827 mm). 

Dishwasher and Icemaker Connectors - one 

hundred twenty (120) inches (3048 mm). 

604.13 PEX-AL-PEX and PE-AL-PE. Crosslinked 
polyethylene-aluminum-crosslinked polyethylene 
(PEX-AL-PEX) and polyethylene-aluminum- 
polyethylene (PE-AL-PE) composite pipe shall be 
marked with the appropriate standard designations 
listed in Table 14-1 for which the piping has been 
listed or approved. PEX-AL-PEX and PE-AL-PE 
piping shall be installed in compliance with the 
provisioi\s of this section. 

604.13.1 PEX-AL-PEX and PE-AL-PE. Fittings 
used with PEX-AL-PEX and PE-AL-PE piping 
shall be manufactured to and marked in 



101 



Table 6-4 -606.1 




TABLE 6-4 


UNIFORM PLUMBING CODE 


Material 


Water Distribution 


Building Supply Pipe : . 




Pipe 


and Fittings 


j . and Fittings 




Hot 


Cold 




Asbestos - Cement 






X^ 


Brass 


X 


X 


. X • '■ 


Copper 


X 


X 


• . X 


Cast Iron 


X 


X 


'x 


CPVC 


X 


X 


X 


Galvanized Malleable Iron 


X 


X 


X 


Galvanized Wrought Iron 


X 


X 


X 


Galvanized Steel 


X 


X 


-■:X-.. 


PE 






X 


PE-AL-PE 


X 


X 


X 


PEX 


X 


X 


• X . •■ . 


PEX-AL-PEX 


X 


X 


■ X 


PVC 






. X • 



accordance with the standard for the fittings in 
Table 14-1. 

604.13.2 Water Heater Connections. PEX-AL- 
PEX or PE-AL-PE tubing shall not be installed 
within the first eighteen inches (18) (457 mm) of 
piping connected to a water heater. 

604.14 Water Heater Connectors. Flexible metallic 
water heater cormectors or reinforced flexible water 
heater connectors connecting water heating to the 
piping system shall be in compliance with the 
appropriate standards listed in Table 14-1. 

605.0 Valves. 

605.1 Valves up to and including two (2) inches (51 
mm) in size shall be brass or other approved 
material. Sizes over two (2) inches (51 mm) may have 
cast-iron or brass bodies. Each gate or ball valve shall 
be a fuUway type with working parts of non- 
corrosive material. 

605.2 A fullway valve controlling all outlets shall be 
installed on the discharge side of each water meter 
and on each unmetered water supply. Water piping 
supplying more than one building on any one premises 
shall be equipped with a separate fullway valve to each 
building, so arranged that the water supply can be 
turned on or off to any individual or separate building 
provided; however, that supply piping to a single- 
family residence and bmlding accessory thereto may be 
controlled on one valve. Such shutoff valves shall be 
accessible at aU times. A fullway valve shaU be installed 
on the discharge piping from water supply tanks at or 
near the tank. A fullway valve shall be installed on the 
cold water supply pipe to each water heater at or near 
the water heater. 



605.3 In multidwelling units, one (1) or more shutoff 
valves shall be provided in each dwelling unit so 
that the water supply to any plumbing fixture or 
group of fixtures in that dwelling unit can be shut off 
without stopping water supply to fixtures iri other 
dwelling units. These valves shall be accessible iri the 
dwelling unit that they control. 

605.4 All valves used to control two (2) or more 
openings shall be fullway gate valves, ball valves, or 
other approved valves designed and approved for 
the service intended. 

605.5 A control valve shall be installed immediately 
ahead of each water-supplied appliance and 
immediately ahead of each slip joint or appliance 
supply. 

Parallel water distribution systems shall provide 
a control valve either immediately ahead of each 
fixture being supplied or installed at the manifold 
and shall be identified with the fixture being 
supplied. 

605.6 All required shutoff or control valves shall be 
accessible. 

605.7 A single control valve shall be installed on a 
water supply line ahead of any automatic metering 
valve that supplies a battery of fixtures. 

606.0 Joints and Connections. 

606.1 Types of Joints. 

606.1.1 Flared Joints. Flared joints for soft 
copper water tubing shall be made with fittings 
meeting approved standards. The tubing shall 
be reamed to the full bore, resized to. round, and 
expanded with a proper flaring tool. 



102 



WATER SUPPLY AND DISTRIBUTION 



606.1 -608.4 



606.1.2 Mechanical Joints. Mechanical joints 
for cast-iron water pipe shall conform to 
nationally recognized standards. 

606.1.3 Mechanically Formed Tee Fittings. 

Mechanically extracted collars shall be formed in 
a continuous operation consisting of drilling a 
pilot hole and drawing out the tube surface to 
form a collar having a height not less than three 
(3) times the thickness of the branch tube wall. 

The branch tube shall be notched to conform 
with the inner curve of the run tube and shall have 
two (2) dimple /depth stops to ensure that 
penetration of the branch tube into the collar is of 
sufficient depth for brazing and that the branch 
tube does not obstruct the flow in the main line 
tube. Etoiple/depth stops shall be in line with the 
nm of the tube. The second dimple shall be one 
quarter (1/4) inch (6.35 mm) above the first and 
shall serve as a visual point of inspection. 

All joints shall be brazed in accordance with 
Section 316.1.7. Soldered joints shall not be 
allowed. 

606.2 Use of Joints. 

606.2.1 Copper Water Tube. Joints in copper 
tubing shall be made by the appropriate use of 
approved fittings properly soldered or brazed 
together as provided in Section 316.1.3 or 316.1.7 
or by means of approved flared or compression 
fittings in Section 606.1.1 or 316.1.5. Solder and 
soldering flux shall conform to the requirements 
of Section 316.1.3. Mechanically formed tee 
fittings shall be made by brazing only and shall 
conform to the requirements of Section 316.1.7. 

606.2.2 Plastic Fittings. Female PVC screwed 
fittings for water piping shall be used with 
plastic male fittings and plastic male threads only. 

606.2.3 Slip Joints. In water piping, slip joints 
may be used only on the exposed fixture supply. 

607.0 Gravity Supply Tanks. 

Gravity tanks for potable water shall be tightly 
covered, and have not less than a sixteen (16) square- 
inch (10,323 mm^) overflow screened with copper 
screen having not less than fourteen (14) nor more 
tlian eighteen (18) openings per linear inch (25.4 mm). 

608.0 Water Pressure, Pressure Regulators, 
Pressure Relief Valves, and Vacuum Relief Valves. 

608.1 Inadequate Water Pressure. Whenever the 
water pressure in the main or other source of supply 
will not provide a residual water pressure of at least 
fifteen (15) pounds per square inch (103.4 kPa), after 



allowing for friction and other pressure losses, a tank 
and a pump or other means that will provide said 
fifteen (15) pound (103.4 kPa) pressure shall be 
installed. Whenever fixtures and/or fixture fittings 
are installed that require residual pressure higher 
than fifteen (15) poimds per square inch (103.4 kPa), 
that minimum residual pressure shall be provided. 

608.2 Excessive Water Pressure. Where static 
water pressure in the water supply piping is in | 
excess of eighty (80) pounds per square inch (552 
kPa), an approved-type pressure regulator preceded 
by an adequate strainer shall be installed and the 
static pressure reduced to eighty (80) pounds per 
square inch (552 kPa) or less. Such regulator(s) shall 
control the pressure to all water outlets in the 
building unless otherwise approved by the 
Authority Having Jurisdiction. Each such regulator 
and strainer shall be accessibly located aboveground 
or in a vault equipped with a properly sized and 
sloped bore-sighted drain to daylight, shall be 
protected from freezing, and shall have the strainer 
readily accessible for cleaning without removing the 
regulator or strainer body or disconnecting the 
supply piping. All pipe size determinations shall be 
based on eighty (80) percent of the reduced pressure 
when using Table 6-6. 

608.3 Any water system provided with a check 
valve, backflow preventer, or any other normally I 
closed device that prevents dissipation of building | 
pressure back into the water main shall be provided 
with an approved, listed, and adequately sized 
expansion tank or other approved device having a 
similar function to control thermal expansion. Such 
expansion tank or other approved device shall be 
installed on the building side of the check valve, 
backflow preventer, or other device and shall be 
sized and installed in accordance with the manur 
facturer's recommendation. 

Any w^ater system containing storage water 
heating equipment shall be provided with an 
approved, listed, adequately sized combination 
pressure and temperature relief valve, except for 
listed nonstorage instantaneous heaters having an 
inside diameter of not more than three (3) inches (80 
mm). Each such approved combination temperature 
and pressure relief valve shall be installed on the 
water-heating device in an approved location based 
on its listing requirements and the manufacturer's 
instructions. Each such combination temperature 
and pressure relief valve shall be provided with a 
drain as required in Section 608.5. 

608.4 Each pressure relief valve shall be an 
approved automatic type with drain, and each such 
relief valve shall be set at a pressure of not more than 
one hundred fifty (150) pounds per square inch (1035 



103 



608.4 - 609.6 



UNIFORM PLUMBING CODE 



kPa). No shutoff valve shall be installed between the 
relief valve and the system or in the drain line. 

608.5 Relief valves located inside a building shall be 
provided with a drain, not smaller than the relief 
valve outlet, of galvanized steel, hard-drawn copper 
piping and fittings, CPVC, or listed relief valve drain 
tube with fittings that will not reduce the internal 
bore of the pipe or tubing (straight lengths as 
opposed to coils) and shall extend from the valve to 
the outside of the building, with the end of the pipe 
not more than two (2) feet (610 mm) nor less than six 
(6) inches (152 mm) above the ground or the flood 
level of the area receiving the discharge and pointing 
downward. Such drains may terminate at other 

I approved locations. Relief valve drains shall not 

' terminate in a building's crawl space. No part of 

such drain pipe shall be trapped or subject to 

freezing. The terminal end of the drain pipe shall not 

be threaded. 

608.6 Any water-heating device connected to a 
separate storage tank and having valves between 
said heater and tank shall be provided with an 
approved water pressure relief valve. 

608.7 Vacuum Relief Valves. Where a hot-water 
storage tank or an indirect water heater is located at 
an elevation above the fixture outlets in the hot- 
water system, a vacuum relief valve shall be installed 
on the storage tank or heater. 

609.0 Installation, Testing, Unions, and Location. 

609.1 installation. All water piping shall be 
adequately supported in accordance with Section 
314.0. Burred ends shall be reamed to the full bore of 
the pipe or tube. Changes in direction shall be made 
by the appropriate use of fittings, except that 
changes in direction in copper tubing may be made 
with bends, provided that such bends are made with 
bending equipment that does not deform or create a 
loss in the cross-sectional area of the tubing. Changes 
in direction are allowed with flexible pipe and 
tubing without fittings in accordance with the 
manufacturer's installation instructions. Provisions 
shall be made for expansion in hot-water piping. All 
piping, equipment, appurtenances, and devices shall 
be installed in a workmanlike marvner in conformity 
with the provisions and intent of the code. All water 
service yard piping shall be at least twelve (12) 
inches (305 mm) below the average local frost depth. 
The minimum cover shall be twelve (12) inches (305 
mm) below finish grade. 

609.2 Water pipes shall not be run or laid in the 
same trench as building sewer or drainage piping 
constructed of clay or materials that are not 
approved for use within a building unless both of 
the following conditions are met: 



609.2.1 The bottom of the water pipe, at all 
points, shall be at least twelve (12) inches (305 
mm) above the top of the sewer or drain line. 

609.2.2 The water pipe shall be placed on a 
solid shelf excavated at one side of the common 
trench with a minimum clear horizontal distance 
of at least twelve (12) inches (305 mm) from the 
sewer or drain line. 

Water pipes crossing sewer or drainage 
piping constructed of clay or materials that are 
not approved for use within a building shall be 
laid a minimum of twelve (12) inches (305 mm) 
above the sewer or drain pipe. 

609.3 Water piping installed within a building and 
in or under a concrete floor slab resting on the 
ground shall be installed in accordance with the 
following requirements: 

609.3.1 Ferrous piping shall have a protective 
coating of an approved type, machine applied 
and conforming to recognized standards. Field 
wrapping shall provide equivalent protection 
and shall be restricted to those short sections 
and fittings necessarily stripped for threading. 
Zinc coating (galvanizing) shall not be deemed 
adequate protection for piping or fittings. 
Approved nonferrous piping shall not be 
required to be wrapped. 

609.3.2 Copper tubing shaU be installed without 
joints where possible. Where joints are permitted, 
they shall be brazed, and fittings shall be 
wrought copper. 

Note: For the purpose of this section, "within the 
building" shall mean within the fixed limits of 
the building foundation. 

609.4 Testing. Upon completion of a section or of 
the entire hot and cold water supply system, it shall 
be tested and proved tight under a water pressure 
not less than the working pressure under which it is 
to be used. The water used for tests shall be obtained 
from a potable source of supply. Except for plastic 
piping, a fifty (50) poiind-per-square-tnch (344.5 kPa) 
air pressure may be substituted for the water test. In 
either method of test, the piping shall withstand the 
test without leaking for a period of not less than 
fifteen (15) minutes. 

609.5 Unions. Unions shall be installed in the water 
supply piping within twelve (12) inches (305 mm) of 
regulating equipment, water heating, conditioning 
tanks, and similar equipment that may require 
service by removal or replacement in a maimer that 
will facilitate its ready removal. 

609.6 Location. Except as provided in Section 609.7, 
no building supply shall be located in any lot other 
than the lot that is the site of the building or 
structure served by such building supply. 



104 



WATER SUPPLY AND DISTRIBUTION 



609.7-610.2 



609.7 Nothing contained in this code shall be 
construed to prohibit the use of all or part of an 
abutting lot to: 

609.7.1 Provide access to connect a building 
supply to an available public water service when 
proper cause and legal easement not in violation 
of other requirements have been first established 
to the satisfaction of the Authority Having 
Jurisdiction. 

609.7.2 Provide additional space for a building 
supply when proper cause, transfer of owner- 
ship, or change of boundary not in violation of 
other requirements have been first established to 
the satisfaction of the Authority Having 
Jurisdiction. The instrument recording such 
action shall constitute an agreement with the 
Authority Having Jurisdiction, which shall 
clearly state and show that the areas so joined or 
used shall be maintained as a unit during the 
time they are so used. Such an agreement shall 
be recorded in the office of the County Recorder 
as a part of the conditions of ownership of said 
properties, and shall be binding on all heirs, 
successors, and assigns to such properties. A 
copy of the instrument recording such pro- 
ceedings shall be filed with the Authority 
Having Jurisdiction. 

609.8 Low-Pressure Cutoff Required on Booster 
Pumps for Water Distribution Systems. When a 
booster pump - excluding a fire pump - is connected 
to a water service or underground water pipe, a low- 
pressure cutoff switch on the inlet side of the pump 
shall be installed within five (5) feet (1,524 mm) of 
the inlet. The cutoff switch shall be set for not less 
than ten (10) psi (68.9 kPa). A pressure gauge shall be 
installed between the shutoff valve and the pump. 

609.9 Disinfection of Potable Water System. New 

or repaired potable w^ater systems shall be disinfected 
prior to use whenever required by the Authority 
Having Jurisdiction. The method to be followed shall 
be that prescribed by the Health Authority or, in case 
no method is prescribed by it, the following: 

609.9.1 The pipe system shall be flushed with 
clean, potable water until only potable water 
appears at the points of outlet. 

609.9.2 The system or parts thereof shall be 
filled with a water-chlorine solution containing 
at least fifty (50) parts per million of chlorine, 
and the system or part thereof shall be valved- 
off and allowed to stand for twenty-four (24) 
hours; or, the system or part thereof shall be 
filled with a water-chlorine solution containing at 
least two hundred (200) parts per million of 
chlorine and allowed to stand for three (3) hours. 



609.9.3 Following the allowed standing time, 
the system shall be flushed with clean, potable 
water until the chlorine residual in the water 
coming from the system does not exceed the 
chlorine residual in the flushing water. 

609.9.4 The procedure shall be repeated if it is 
shown by bacteriological examination made by 
an approved agency that contamination persists 
in the system. 

609.10 Water Hammer. All building water supply 
systems in which quick-acting valves are installed 
shall be provided with devices to absorb the hammer 
caused by high pressures resulting from the quick 
closing of these valves. These pressure-absorbing 
devices shall be approved mechanical devices. Water 
pressure-absorbing devices shall be installed as close 
as possible to quick-acting valves. 

609.10.1 IVIechanical Devices. When listed 
mechanical devices are used, the manufacturers' 
specifications as to location and method of 
installation shall be followed. 

610.0 Size of Potable Water Piping. 

610.1 The size of each water meter and each 
potable water supply pipe from the meter or other 
source of supply to the fixture supply branches, 
risers, fixtures, connections, outlets, or other uses 
shall be based on the total demand and shall be 
determined according to the methods and 
procedures outlined in this section. Water piping 
systems shall be designed to ensure that the 
maximum velocities allowed by the code and the 
applicable standard are not exceeded. 

610.2 Whenever a water filter, water softener, 
backflow prevention device, or similar device is 
installed in any water supply line, the pressure loss 
through such devices shall be included in the 
pressure loss calculations of the system, and the 
water supply pipe and meter shall be adequately 
sized to provide for any such pressure loss. 

No water filter, water softener, backflow 
prevention device, or similar device regulated by this 
code shall be installed in any potable water supply 
piping when the installation of such device produces 
an excessive pressure drop in any such water supply 
piping. In the absence of specific pressure drop 
information, the diameter of the inlet or outlet of any 
such device or its cormecting piping shall not be less 
than the diameter of such water distribution piping 
to the fixtures served by the device. 

All such devices shall be of a type approved by 
the Authority Having Jurisdiction and shall be tested 
for flow rating and pressure loss by an approved 
laboratory or recognized testing agency to standards 
consistent with the intent of this chapter. 



105 



610.3-610.10 



UNIFORM PLUMBING CODE 



61 0.3 The quantity of water required to be supplied 
to every plumbing fixture shall be represented by 
fixture units, as shown in Table 6-5. Equivalent 
fixture values shown in Table 6-5 include both hot 
and cold water demand. 

610.4 Systems within the range of Table 6-6 may be 
sized from that table or by the method set forth in 
Section 610.5. 

Listed parallel water distribution systems shall 
be installed in accordance with their listing, but at no 
time shall any portion of the system exceed the 
maximum velocities allowed by the code. 

610.5 Except as provided in Section 610.4, the size of 
each water piping system shall be determined in 
accordance with the procedure set forth in Appendix 
A. For alternate methods of sizing water supply 

systems, see Appendix L. 

610.6 Except where the type of pipe used and the 
water characteristics are such that no decrease in 
capacity due to length of service (age of system) may 
be expected, all friction-loss data shall be obtained 
from the "Fairly Rough" or "Rough" charts in 
Appendix A of this code. Friction or pressure losses 
in water meter, valve, and fittings shall be obtained 
from the same sources. Pressure losses through 
water-treating equipment, backflow prevention 
devices, or other flow-restricting devices shall be 
computed as required by Section 610.2. 

610.7 On any proposed water piping installation 
sized using Table 6-6, the following conditions shall 
be determined: 

(1) Total number of fixture units as determined 
from Table 6-5, Equivalent Fixture Units, for 
the fixtures to be installed. 

(2) Developed length of supply pipe from meter 
to most remote outlet. 

(3) Difference in elevation between the meter or 
other source of supply and the highest 
fixture or outlet. 

(4) Pressure in the street main or other source of 
supply at the locality where the installation 
is to be made. 

(5) In localities where there is a fluctuation of 
pressure in the main throughout the day, 
the water piping system shall be designed 
on the basis of the minimum pressure 
available. 

610.8 Size of Meter and Building Supply Pipe 
Using Table 6-6. The size of the meter and the 
building supply pipe shall be determined as follows: 

(1) Determine the available pressure at the 
water meter or other source of supply. 

(2) Subtract one-half (1/2) pound per square 
inch pressure (3.4 kPa) for each foot (305 



mm) of difference in elevation between such 
source of supply and the highest water supply 
outlet in the building or on the premises. 

(3) Use the "pressure range" group within 
which this pressure will fall using Table 6-6. 

(4) Select the "length" column that is equal to 
or longer than the required length. 

(5) Follow down the column to a fixture unit 
value equal to or greater than the total 
number of fixture units required by the 
installation. 

(6) Having located the proper fixture unit value 
for the required length, sizes of meter and 
buildingsupply pipe as found in the two 
left-hand columns shall be applied. 

No building supply pipe shall be less 
than three-quarter (3/4) inch (20 mm) in 
diameter. 

610.9 Size of Branches. When Table 6-6 is used, 
the minimum size of each branch shall be 
determined by the number of fixture units to be 
served by that branch, the total developed length of 
the system, and the meter and street service size as 
per Section 610.8. No branch piping is required to 
be larger in size than that required by Table 6-6 for 
the building supply pipe. 

610.10 Sizing for Flushometer Valves. When 
using Table 6-6 to size water supply systems serving 
flushometer valves, the number of flushometer 
fixture units assigned to every section of pipe, 
whether branch or main, shall be determined by the 
number and category of flushometer valves served 
by that section of pipe, in accordance with Table 6-7. 
Piping supplying a flushometer valve shall not be 
less in size than the valve inlet. 

When using Table 6-7 to size water piping, care must 
be exercised to assign flushometer fixture units 
based on the number and category of fixtures served. 
In the exam.ple below, fixture units assigned to each 

Sizing Method 
Example Using TABLE 6-7 

Public Use Fixtures 

LAV LAV UR UR WC WC 
J L_l I L_J 



LAV LAV UR UR WC WC 
I I I I I I 



H I 



LAV UR WC LAV UR WC 
_J I I I I I 



R Q P O N 



106 



WATER SUPPLY AND DISTRIBUTION 



610.10-611.4 



section of pipe are computed as follows: Note: Each 
capital letter refers to the section of pipe above it, 
unless otherwise shown. 



A: 1WC = 40F.U. 

B: 2 WC = 70 F.U. 

C: 2 WC (70) + 1 UR (20) = 90 F.U. 

D: 2 WC (70) + 2 UR (35) = 105 F.U. 

E: 2 WC (70) + 2 UR (35) + 1 LAV (1) = 106 F.U. 

F: 2 WC (70) + 2 UR (35) + 2 LAV (2) = 107 F.U. 

G: 1 LAV = 1 F.U. 

H: 2 LAV = 2 F.U. 

I: 2 LAV (2) + 1 UR (20) = 22 F.U. 

J: 2 LAV (2)+ 2 UR (35) = 37 F.U. 

K: 2 LAV (2) + 2 UR (35) + 1 WC (40) = 17 F.U. 

L: 2 LAV (2) + 2 UR (35) + 2 WC (70) = 107 F.U. 

M: 4 WC (105) + 4 UR (53) + 4 LAV (4) = 162 F.U. 

N: 1WC = 40F.U. 

O: 1 WC (40) + 1 UR (20) = 60 F.U. 

P: 1 WC (40) + 1 UR (20) + 1 LAV (1) = 61 F.U. 

Q: 2 WC (70) + 1 UR (20) + 1 LAV (1) = 91 F.U. 

R: 2 \NC (70) + 2 UR (35) + 1 LAV (1) = 106 F.U. 

S: 2 WC (70) + 2 UR (35) + 2 LAV (2) = 107 F.U. 

T: 6 WC (125) + 6 UR (63) + 6 LAV (6) = 194 F.U. 

610.11 Sizing Systems for Flushometer Tanks. 

The size of branches and mains serving flushometer 
tanks shall be consistent with the sizing procedures 
for flush tank water closets. 

610.12 Sizing for Velocity. Water piping systems 
shall not exceed the maximum velocities listed in this 
section or Appendix A. 

610.12.1 Copper Tube Systems. Maximum 
velocities in copper and copper alloy tube and 
fitting systems shall be limited to a maximum of 
eight (8) feet per second (fps) (2.4 m.ps) in cold 
water and five (5) fps in hot water (1.52 mps). 

610.12.2 Tubing Systems Using Copper 
Alloy Fittings. Maximum velocities through 
copper alloy fittings in tubing other than copper 
shall be limited to a maximum of eight (8) feet 
per second (fps) (2.4 mps) in cold water and five 
(5) fps in hot water (1.52 mps). 

610.13 Exceptions. The provisions of this section 
relative to size of water piping shall not apply to the 
following: 



(1) Water supply piping systems designed in 
accordance with recognized engineering 
procedures acceptable to the Authority 
Having Jurisdiction. 

(2) Alteration of or n\inor additions to existing 
installations, provided the Authority Having 
Jurisdiction finds that there will be 
an adequate supply of water to operate all 
fixtures. 

(3) Replacement of existing fixtures or 
appliances. 

(4) Piping that is part of fixture equipment. 

(5) Unusual conditions where, in the judgment 
of the Authority Having Jurisdiction, an 
adequate supply of water is provided to 
operate fixtures and equipment. 

(6) Nonpotable waterlines as defined in 
Sections 601.2.2 and 601.2.3. 

(7) The size and material of irrigation water 
piping installed outside of any building or 
structure and separated from the potable 
water supply by means of an approved 
airgap or backflow prevention device is not 
regulated by this code. The potable water 
piping system supplying each such 
irrigation system shall be adequately sized 
as required elsewhere in this chapter to 
deliver the full connected demand of both 
the domestic use and the irrigation systems. 

611.0 Drinking Water Treatment Units. 

611.1 Compliance with Standard. Drinking water 
treatment units shall meet the requirements of the 
appropriate standard referenced in Table 14-1. 

611.2 Airgap Discharge. Discharge from all 
drinking water treatment units shall enter the 
drainage system through an airgap or an airgap 
device that meets the requirements of the appropriate 
standards referenced in Table 14-1. 

61 1 .3 Connection Tubing. The tubing to and from 
drinking water treatment units shall be of a size and 
material as recommended by the manufacturer. The 
tubing shall comply with the requirements of the 
appropriate standards referenced in Table 14-1. 

61 1 .4 Sizing of Residential Softeners. Residential- 
use water softeners shall be sized per Table 6-8. 



107 



Table 6-5 



UNIFORM PLUMBING CODE 



Inch 


mm 


1/2 


15 


3/4 


20 


1 


25 



TABLE 6-5 
Water Supply Fixture Units (WSFU) and Minimum Fixture Branch Pipe Sizes' 



Minimum 
Fixture Branch Private 

Appliances, Appurtenances or Fixtures' Pipe Size" 

Bathtub or Combination Bath/Shower (fill) 1/2" 4.0 

3/4" Bathtub Fill Valve 3/4" 10.0 

Bidet 1/2" 1.0 

Clothes washer 1/2" 4.0 

Dental Unit, cuspidor 1/2" 

Dishwasher, domestic 1/2" 1.5 

Drinking Fountain or Watercooler 1/2" 0.5 

Hose Bibb... 1/2" 2.5 

Hose Bibb, each additional' 1/2" 1.0 

Lavatory 1/2" 1.0 

Lawn Sprinkler, each head' 1 .0 

Mobile Home, each (minimum) 12.0 

Sinks 

Bar ; 1/2" 1.0 

Clinic Faucet 1/2" 

Clinic Flushometer Valve 

with or without faucet 1" 

Kitchen, domestic 1/2" 1 .5 

Laundry ..: 1/2" 1.5 

Service or Mop Basin 1/2" 1.5 

Washup, each set of faucets.......... ...1/2" 

Shower, per head 1/2" 2.0 

Urinal, 1 .0 GPF Flushometer Valve 3/4" See Footnote ' 

Urinal, greater than 1.0 GPF Flushometer Valve 3/4" See Footnote ' 

Urinal, flush tank 1/2" 2.0 

Washfountain, circular spray 3/4" 

Water Closet, 1.6 GPF Gravity Tank 1/2" 2.5 

Water Closet, 1.6 GPF Flushometer Tank 1/2" 2.5 

WaterCloset, 1.6 GPF Flushometer Valve 1" SeePootnote' 

Water Closet, greater than 1 .6 GPF Gravity Tank 1/2" 3.0 

Water Closet, greater than 1 .6 GPF Flushometer Valve 1" seeFootnote^ 



Public 

4.0 
10.0 

4.0 
1.0 
1.5 
0.5 
2.5 
1.0 
1.0 
1.0 



2.0 
3.0 

8.0 
1.5 
1.5 
3.0 
2.0 
2.0 



2.0 
4.0 
2.5 
2.5 

5.5 



Assembly' 



0.75 



1.0 



3.0 

3.5 
3.5 

7.0 



Notes: 

' Size of the cold branch pipe, or both the hot and cold branch pipes. 

^ Appliances, Appurtenances or Fixtures not included in this Table may be sized by reference to fixtures having a 

similar flow rate and frequency of use. 
^ The listed fixture unit values represent their load on their cold water service. The separate cold water and hot water 

fixture unit value for fixtures having both hot and cold water connections may each be taken as three-quarter ( 3/4) 

of the listed total value of the fixture. 
" The listed minimum supply branch pipe sizes for individual fixtures are the nominal (I.D.) pipe size. 
^ For fixtures or supply connections likely to impose continuous flow demands, determine the required flow in gallons 

per minute (GPM), and add it separately to the demand (in GPM) for the distribution system or portions thereof. 
^ Assembly [Public Use (See Table 4-1 )]. 
^ When sizing flushometer systems, see Section 61 0.10. 
^ Reduced fixture unit loading for additional hose bibbs is to be used only when sizing total building demand and for 

pipe sizing when more than one hose bibb is supplied by a segment of water-distributing pipe. The fixture branch to 

each hose bibb shall be sized on the basis of 2.5 fixture units. 



108 



WATER SUPPLY AND DISTRIBUTION 



Table 6-6 



TABLE 6-6 
Fixture Unit Table for Determining Water Pipe and IVIeter Sizes 



Pressure Range - 30 to 45 psi (207 to 310 kPa) 

Meter Building 
and Supply 
Street and 
Service, Branches, 
Inches Inches 40 



3/4 

3/4 

3/4 

1 

3/4 

1 

1-1/2 

1 
1-1/2 
2 
1 
1-1/2 
2 
2 



(12) 

6 
16 
29 
36 



-I in*** 

3/4 
1 
1 

1-1/4 36 

1-1/4 54 

1-1/4 78 

1-1/2 85 

1-1/2 150 

1-1/2 151 

2 85 

2 220 

2 370 

2-1/2 445 



60 
(18) 

5 

16 

25 

31 

33 

47 

68 

84 

124 

129 

85 

205 

327 

418 



80 
(24) 

4 

14 

23 

27 

31 

42 

57 

79 

105 

129 

85 

190 

292 

390 



100 
(30) 

3 

12 

21 

25 

28 

38 

48 

65 

91 

110 

85 

176 

265 

370 



Maximum Allowable Length in Feet (meters) 



150 
(46) 

2 

9 

17 

20 

24 

32 

38 

56 

70 

80 

85 

155 

217 

330 



200 
(61) 

1 

6 

15 

17 

23 

28 

32 

48 

57 

64 

85 

138 

185 

300 



250 
(76) 

1 

5 

13 

15 

21 

25 

28 

43 

49 

53 

82 

127 

164 

280 



300 
(91) 

1 

5 

12 

13 

19 

23 

25 

38 

45 

46 

80 

120 

147 

265 



400 
(122) 


4 

10 

12 

17 

19 

21 

32 

36 

38 

66 
104 
124 
240 



500 
(152) 



4 

8 

10 

16 

17 

18 

28 

31 

32 

61 

85 

96 

220 



Inch 


mm 


1/2 


15 


3/4 


20 


1 


25 


1-1/4 


32 


1-1/2 


40 


2 


50 


2-1/2 


65 



600 
(183) 



3 

6 

8 
13 
14 
15 
26 
26 
27 
57 
70 
70 
198 



700 
(213) 



2 

6 

6 
12 
12 
12 
22 
23 
23 
52 
61 
61 
175 



800 900 1000 

(244) (274) (305) 



2 2 1 

6 6 6 

6 6 6 

12 11 11 

12 11 11 

12 11 11 

21 20 20 

21 20 20 

21 20 20 

49 46 43 

57 54 51 

57 54 51 

158 143 133 



Pressure Range - 46 to 

3/4 1/2*** 



3/4 
3/4 

1 
3/4 

1 
1-1/2 

1 
1-1/2 

2 

1 
1-1/2 

2 

2 



3/4 

1 

1 
1-1/4 
1-1/4 
1-1/4 
1-1/2 
1-1/2 
1-1/2 

2 

2 

2 
2-1/2 



7 

20 

39 

39 

39 

78 

78 

85 

151 

151 

85 

370 

370 

654 



60 psi 

7 

20 

39 

39 

39 

78 

78 

85 
151 
151 

85 
370 
370 
640 



(317 to 

6 

19 

36 

39 

39 

76 

78 

85 
151 
151 

85 
340 
370 
610 



414 kPa)^ 

5 

17 

33 

36 

39 

67 

78 

85 
151 
151 

85 
318 
370 
580 



4 

14 

28 

30 

39 

52 

66 

85 

128 

150 

85 

272 

368 

535 



3 

11 

23 

25 

39 

44 

52 

85 

105 

117 

85 

240 

318 

500 



2 
9 
21 
23 
34 
39 
44 
80 
90 
98 
85 
220 



2 
8 
19 
20 
32 
36 
39 
67 
78 
84 
85 
198 



280 250 
470 440 



1 

6 

17 

18 

27 

30 

33 

55 

62 

67 

85 

170 

205 

400 



1 
5 
14 
15 
25 
27 
29 
49 
52 
55 
85 



1 
4 
12 
12 
22 
24 
24 
41 
42 
42 
85 



150 135 
165 142 
365 335 





4 

10 

10 

19 

20 

20 

37 

38 

38 

85 

123 

123 

315 





3 

9 

9 

19 

19 

19 

34 

35 

35 

85 

110 

110 

285 





3 

8 

8 

17 

17 

17 

32 

32 

32 

83 

102 

102 





3 

8 

8 

16 

16 

16 

30 

30 

30 

80 

94 

94 



267 250 



Pressure Range - Over 60 psi (414 



3/4 

3/4 

3/4 

1 

3/4 

1 

1-1/2 

1 
1-1/2 
2 
1 
1-1/2 
2 
2 



7 
20 
39 
39 



1/2**^ 

3/4 

1 

1 

1-1/4 39 

1-1/4 78 

1-1/4 78 

1-1/2 85 

1-1/2 151 

1-1/2 151 

2 85 

2 370 

2 370 

2-1/2 654 



7 

20 

39 

39 

39 

78 

78 

85 

151 

151 

85 

370 

370 

654 



7 

20 

39 

39 

39 

78 

78 

85 

151 

151 

85 

370 

370 

654 



kPa)* 

6 

20 

39 

39 

39 

78 

78 

85 
151 
151 

85 
370 
370 
654 



5 

17 

35 

38 

39 

74 

78 

85 

151 

151 

85 

360 

370 

654 



4 

13 

30 

32 

39 

62 

74 

85 

151 

151 

85 

335 

370 

650 



3 
11 
27 
29 
39 
53 
65 
85 
130 
142 
85 



3 

10 
24 
26 
39 
47 
54 
85 
113 
122 
85 



305 282 
370 340 
610 570 



2 

8 

21 

22 

34 

39 

43 

81 

88 

98 

85 

244 

288 

510 



1 

7 
17 
18 
28 
31 
34 
64 
73 
82 
85 



1 
6 
14 
14 
26 
26 
26 
51 
51 
64 
85 



212 187 
245 204 
460 430 



1 

6 

13 

13 

25 

25 

25 

48 

51. 

51 

85 

172 

172 

404 



1 

5 

12 

12 

23 

23 

23 

46 

46 

46 

85 

153 

153 

380 



1 

4 

12 

12 

22 

22 

22 

43 

43 

43 

85 

141 

141 





4 

11 

11 

21 

21 

21 

40 

40 

40 

85 

129 

129 



356 329 



'*Available static pressure after head loss. 

''**Building supply, three-quarter (3/4) inch (20 mm) nominal size minimum. 



109 



Table 6-7 - Table 6-8 



UNIFORM PLUMBING CODE 



Table 6-7 

Flushometer Fixture Units for Water Sizing Using 

Table 6-5 



Fixture Category: Water Closet w/ Flushometer Valves 




Individual 


Fixture Units Assigned 


Number of 


Fixture Units 


for Water Closets and 


Flushometer 


Assigned in 


Similar 10-Unit Fixtures 


Valves 


Decreasing Value 


in Accumulative Values 


1 


40 


40 


2 


30 


70 


3 


20 


90 


4 


15 


105 


5 or more 


10 each 


115 plus 10 for each 

additional fixture 

in excess of 5 


Fixture Category: Urinals w/ Flushometer Valves 




Individual 


Fixture Units Assigned 


Number of 


Fixture Units 


for Urinals and 


Flushometer 


Assigned in 


Similar 5-Urut Fixtures 


Valves 


Decreasing Value 


in Accumulative Values 


1 


20 


20 


2 


. 15 


35 


3 


10 


45 


4 


.8 


53 


5 or more 


5 each 


58 plus 5 for each 

additional fixture 

in excess of 5 



TABLE 6-8 
Sizing of Residential Water Softeners 



Required Size of 
Softener Connection 



Number of Bathroom 
Groups Served^ 



3/4 in. 
lin. 



up to 2 

.3 

Up to 4 



^ Installation of a kitchen sink and dishwasher, 
laundry tray, and automatic clothes washer 
permitted without additional size increase. 

^ An additional water closet and lavatory permitted. 

^ Over four bathroom groups, the softener size shall 
be engineered for the specific installation. 

See also Appendix A, Recommended Rules for Sizing the 
Water Supply System, and Appendix L, Alternate 
Plumbing Systejns, for alternate methods of sizing water 
supply systems. 



110 



CHAPTER 7 



SANITARY DRAINAGE 



Part I - Drainage Systems. 

701.0 Materials. 

701.1 Drainage piping shall be cast iron, galvanized 
steel, galvanized wrought iron, lead, copper, brass, 

I Stainless Steel 304 or 316L, Schedule 40 ABS DWV, 
Schedule 40 PVC DWV, extra-strength vitrified clay 
pipe, or other approved materials having a smooth and 
uniform bore, except that: 

701.1.1 No galvanized wrought-iron or 
galvanized steel pipe shall be used underground 
and shall be kept at least six (6) inches (152 mm) 
aboveground. 

701.1.2 ABS and PVC DWV piping installations 
shall be installed in accordance with IS 5, IS 9, 
and Chapter 15 "Firestop Protection/' Except for 
individual single-family dwelling units, 
materials exposed within ducts or plenums shall 
have a flame-spread index of not more than 25 
and a smoke-developed index of not more than 
50, when tested in accordance with the Test for 
Surface - Burning Characteristics of the Building 
Materials. (See the Building Code standards 
based on ASTM E-84 and ANSI/UL 723.) 

701.1.3 No vitrified clay pipe or fittings shall 
be used aboveground or where pressurized by 
a pump or ejector. They shall be kept at least 
twelve (12) inches (305 mm) belowground. 

701.1.4 Copper tube for drainage and vent 
piping shall have a weight of not less than that 
of copper drainage tube type DWV. 

701.1.5 Stainless steel 304 pipe and fittings shall 
not be installed underground and shall be kept 
at least 6 inches (152 mm) aboveground. 

701 .2 Drainage fittings shall be of cast iron, malleable 
iron, lead, brass, copper, ABS, PVC, vitrified clay, 
stainless steel 304 and 31 6L (304 shall not be installed 
underground and shall be kept at least 6 inches (152 
mm) aboveground), or other approved materials 
having a smooth interior waterway of the same 
diameter as the piping served, and all such fittings 
shall be compatible with the type of pipe used. 

701 .2.1 Fittings on screwed pipe shall be of the 
recessed drainage type. Burred ends shall be 
reamed to the full bore of the pipe. 

701 .2.2 The threads of drainage fittings shall be 
tapped so as to allow one-quarter (1/4) inch per 
foot (20.9 mm/m) grade. 



701 .2.3 Fittings used for drainage shall be of the 
drainage type, have a smooth interior water- 
way, and be constructed so as to allow one 
fourth (1/4) inch per foot (20.9 mm/m) grade. 

701.3 Lead. 

See Table 14-1. Sheet lead shall be not less than the 
following: 

For safe pans - not less than four (4) pounds per 
square foot (19.5 kg/m^) or 1/16 inch (1.6 mm) thick. 



TABLE 7-1 
Caulking Ferrules 



Pipe Size 
(inches) 



Inside 
Diameter 
(inches) 



Length 
(inches) 



l\1inimum 

Weight Each 

lb. oz. 



2 


2-1/4 


4-1/2 


1 





3 


3-1/4 


4-1/2 


1 


12 


4 


4-1/4 


4-1/2 


2 


8 



Caulking Ferrules (Metric) 


Pipe Size 
(mm) 


Inside 

Diameter 

(mm) 


Length 
(mm) 


IVIinimum 

Weight Each 

(kg) 


50 
80 
100 


57 
83 
108 


114 
114 
114 


0.454 
0.790 
1.132 


TABLE 7-2 
Soldering Bushings 


Pipe Size 
(inches) 


l\/linimum 

Weight Each 

lb. oz. 


Pipe Size 
(inches) 


l\1inimum 

Weight Each 

lb. oz. 


1-1/4 
1-1/2 

2 


6 

.0 8 

14 


2-1/2 
3 
4 


1 6 

2 

3 8 


Soldering Bushings (Metric) 


Pipe Size 
(mm) 


l\/linimum 
Weight Each 
(kg) 


Pipe Size 
(mm) 


Minimum 

Weight Each 

(kg) 



32 


0.168 


65 


0.622 


40 


0.224 


80 


0.908 


50 


0.392 


100 


1.586 



111 



Table 7-3 



UNIFORM PLUMBING CODE 



TABLE 7-3 
Drainage Fixture Unit Values (DFU) 

Min. Size 

Trap and 

Plumbing Appliance, Appurtenance, or Fixture Trap Arm' 

Bathtub or Combination Bath/Shower 1-1/2" 

Bidet ..1-1/4" 

Bidet 1-1/2" 

Clothes Washer, domestic, standpipe' 2" 

Dental Unit, cuspidor 1-1/4" 

Dishwasher, domestic, with independent drain 1-1/2"' 

Drinking Fountain or Watercooler (per head) 1-1/4" 

Food-Waste-Grinder, commercial 2" 

Floor Drain, emergency 2" 

Floor Drain (for additional sizes see Section 702) 2" 

Shower, single-head trap 2" 

Multi-head, each additional 2" 

Lavatory, single 1-1/4" 

Lavatory, in sets of two or three 1-1/2" 

Washfountain 1-1/2" 

Washfountain 2" 

Mobile Home, trap 3" 

Receptor, indirect waste" ..1-1/2" 

Receptor, indirect waste" 2" 

Receptor, indirect waste' 3" 

Sinks 

Bar.. 1-1/2" 

Bar 1-1/2"' 

Clinical 3" 

Commercial with food waste 1-1/2"' 

Special Purpose 1-1/2" 

Special Purpose 2" 

Special Purpose 3" 

Kitchen, domestic 1-1/2"' 

(with or without food-waste grinder and/or dishwasher) 

Laundry 1-1/2" 

(with or without discharge from a clothes washer) 

Service or Mop Basin '. 2" 

Service or Mop Basin 3" 

Service, flushing rim 3" 

Wash, each set of faucets 

Urinal, integral trap 1 .0 GPF' 2" 

Urinal, integral trap greater than 1.0 GPF 2" 

Urinal, exposed trap 1-1/2"' 

Water Closet, 1 .6 GPF Gravity Tank' 3" 

Water Closet, 1 .6 GPF Flushometer Tank' 3" 

Water Closet, 1 .6 GPF Flushometer Valve' 3" 

Water Closet, greater than 1 .6 GPF Gravity Tank' 3" 

Water Closet, greater than 1 .6 GPF Flushometer Valve' 3" 

' Indirect waste receptors shall be sized based on the total drainage capacity of the fixtures that drain therein to, in accordance with Table 7-4. 

^ Provide a 2" (51 mm) minimum drain. 

^ For refrigerators, coffee urns, water stations, and similar low demands. 

" For commercial sinks, dishwashers, and similar moderate or heavy demands. 

= Buildings having a clothes-washing area with clothes washers in a battery of three (3) or more clothes washers shall be rated at six (6) fixture units each for 

purposes of sizing common horizontal and vertical drainage piping. 
^ Water closets shall be computed as six (6) fixture units when determining septic tank sizes based on Appendix K of this code. 
' Trap sizes shall not be increased to the point where the fixture discharge may be inadequate to maintain their self-scouring properties. 
" Assembly [Public Use (See Table 4-1)]. 



(DFU) 


Public 
2.0 


Inch mm 

1-1/4 32 
1-1/2 40 

2 50 
2-1/2 65 

3 80 


Private 
2.0 


Assembly' 


1.0 






2.0 






3.0 


3.0 


3.0 




1.0 


1.0 


2.0 


2.0 


2.0 


0.5 


0.5 


1.0 




3.0 


3.0 




0.0 


0.0 


2.0 


2.0 


2.0 


2.0 


2.0 


2.0 


1.0 


1.0 


1.0 


1.0 


1.0 


1.0 


2.0 


2.0 


2.0 




2.0 


2.0 




3.0 


3.0 


12.0 








See footnote '-^ 




See footnote '" 




See footnote ' 


1.0 








2.0 


2.0 




6.0 


6.0 




3.0 


3.0 


2.0 


3.0 


3.0 


3.0 


4.0 


4.0 




6.0 


6.0 


2.0 


2.0 





2.0 



2.0 



2.0 





3.0 


3.0 




3.0 


3.0 




6.0 


6.0 




2.0 


2.0 


2.0 


2.0 


5.0 


2.0 


2.0 


6.0 


2.0 


2.0 


5.0 


3.0 


4.0 


6.0 


3.0 


4.0 


6.0 


3.0 


4.0 


6.0 


4.0 


6.0 


8.0 


4.0 


6.0 


8.0 



112 



SANITARY DRAINAGE 



701 .3 - 704.4 



For flashings or vent terminals - not less 
than three (3) pounds per square foot (15 kg/m^) or 
1.2 mm thick. 

Lead bends and lead traps shall not be less than 
one-eighth (1/8) inch (3.2 mm) wall thickness. 

701.4 Ferrules and Bushings 

701.4.1 Caulking ferrules shall be manufactured 
from bronze or copper and shall be in accordance 
with Table 7-1. 

701 .4.2 Soldering bushings shall be of bronze or 
copper in accordance with Table 7-2. 

702.0 Fixture Unit Equivalents. 

The unit equivalent of plumbing fixtures shown in 
Table 7-3 shall be based on the size of the trap 
required, and the unit equivalent of fixtures and 
devices not shown in Table 7-3 shall be based on the 
rated discharge capacity in gpm (gallons per minute) 
(liters per second) in accordance with Table 7-4. 

Maximum trap loadings for sizes up to four (4) 
inches (102 mm) are as follows: 

1-1/4 in. (32 mm) — 1 unit 

1-1/2 in. (40 mm) — 3 imits 

2 in. (50 mm) — 4 units 

3 in. (80 mm) — 6 units 

4 in. (100 mm) — 8 units 
Exception: On self-service laundries. 

703.0 Size of Drainage Piping. 

703.1 The minimum sizes of vertical and/or 
horizontal drainage piping shall be determined from 
the total of all fixture units coruiected thereto, and 
additionally, in the case of vertical drainage pipes, in 
accordance with their length. 

703.2 Table 7-5 shows the maximum number of 
fixture units allowed on any vertical or horizontal 
drainage pipe, building drain, or building sewer of a 
given size; the maximum number of fixture units 
allowed on any branch interval of a given size; and 
the maximum length (in feet and meters) of any 
vertical drainage pipe of a given size. 



TABLE 7-4 

Discharge Capacity in Gallons per Minute 
(Liters per Second) 

For Intermittent Flow Only 



GPM 



(L/sec) 



Up to 7-1/2 (Up to 0.47) Equals 1 Unit 

8 to 15 (0.50 to 0.95) Equals 2 Units 

16 to 30 (1.00 to 1.89) Equals 4 Units 

31 to 50 (1.95 to 3.15) Equals 6 Units 



Discharge capacity for over 50 gallons per minute 
(3.15 L/sec.) shall be determined by the Authority 
Having Jurisdiction. 

For a continuous flow into a drainage system, 
such as from a pump, sump ejector, air conditioning 
equipment, or similar device, two (2) fixture units 
shall be allowed for each gallon per minute (0.06 
L/sec.) of flow. 

703.3 For alternate method of sizing drainage piping, 
see Appendix L. 

704.0 Fixture Connections (Drainage). 

704.1 Drainage piping shall be provided with 
approved inlet fittings for fixture connections, 
correctly located according to the size and type of 
fixture proposed to be cormected. 

704.2 Two fixtures set back-to-back, or side-by-side, 
within the distance allowed between a trap and its 
vent may be served by a single vertical drainage pipe 
provided that each fixture wastes separately into an 
approved double-fixture fitting having inlet openings 
at the same level. 

704.3 Pot sinks, scullery sinks, dishwashing sinks, 
silverware sinks, commercial dishwashing machines, 
silverware-washing machines, and other similar 
fixtures shall be connected directl)/^ to the drainage 
system. A floor drain shall be provided adjacent to 
the fixture, and the fixture shall be connected on the 
sewer side of the floor drain trap, provided that no 
other drainage line is connected between the floor 
drain waste connection and the fixture drain. The 
fixture and floor drain shall be trapped and vented 
as required by this code. 

704.4 Closet Rings (Closet Flanges). 

704.4.1 Closet rings (closet flanges) for water 
closets or similar fixtures shall be of an approved 
type and shall be bronze, copper, hard lead, cast 
iron, galvanized malleable iron, ABS, PVC, or 
other approved materials. Each such closet ring 
(closet flange) shall be approximately seven (7) 
inches (175 mm) in diameter and, when installed, 
shall, together with the soil pipe, present a one 
and one-half (1-1/2) inch (38 mm) wide flange or 
face to receive the fixture gasket or closet seal. 

704.4.2 Caulked-on closet rings (closet flanges) 
shall be not less than one-fourth (1/4) inch 
(6.4mm) thick and not less than two (2) inches 
(51mm) in overall depth. 

704.4.3 Closet rings (closet flanges) shall be 
burned or soldered to lead bends or stubs, shall 
be caulked to cast-iron soil pipe, shall be solvent 
cemented to ABS and PVC, and shall be screwed 



113 



Table 7-5 -705.1 



UNIFORM PLUMBING CODE 



TABLE 7-5 

Maximum Unit Loading and Maximum Length of Drainage and Vent Piping 



Size of Pipe, inches 


1-1/4 


1-1/2 


2 


2-1/2 


3 


4 


5 


6 


8 


10 


12 


(mm) 


(32) 


(40) 


(50) 


(65) 


(80) 


(100) 


(125) 


(150) 


(200) 


(250) 


(300) 


Maximum Units 
























Drainage Piping' 
























Vertical 


1 


2^ 


16^ 


32^ 


48^ 


256 


600 


1,380 


3,600 


5,600 


8,400 


Horizontal 


1 


1 


8' 


14^ 


35^ 


216' 


428' 


720' 


2,640' 


4,680' 


8,200' 


n/laximum Lengtii 
























Drainage Piping 
























Vertical, feet 


45 


65 


85 


148 


212 


300 


390 


510 


750 






(m) 


(14) 


(20) 


(26) 


(45) 


(65) 


(91) 


(119) 


(155) 


(228) 






Horizontal (unlimited) 
























Vent Piping (See note) 






















Horizontal and Vertical 
























Maximum Units 


1 


8' 


24 


48 


84 


256 


600 


1,380 


3,600 






Maximum Lengths, feet 


45 


60 


120 


180 


212 


300 


390 


510 


750 






(m) 


(14) 


(18) 


(37) 


(55) 


(65) 


(91) 


(119) 


(155) 


(228) 







^ Excluding trap arm. 

^ Except sinks, urinals, and dishwashers. 

^ Except six-unit traps or water closets. 

" Only four (4) water closets or six-unit traps allowed on any vertical pipe or stack; and not to exceed three (3) water closets 

or six-unit traps on any horizontal branch or drain. 

= Based on one-fourth (1/4) inch per foot (20.9 mm/m) slope. For one-eighth (1/8) inch per foot (10.4 mm/m) slope, multiply 

horizontal fixture units by a factor of 0.8. 

Note: The diameter of an individual vent shall not be less than one and one-fourth (1-1/4) inches (31.8 mm) nor less than 
one-haif (1/2) the diameter of the drain to which it is connected. Fixture unit load values for drainage and vent piping shall 
be computed from Tables 7-3 and 7-4. Not to exceed one-third (1/3) of the total permitted length of any vent may be 
installed in a horizontal position. When vents are increased one (1) pipe size for their entire length, the maximum length 
limitations specified in this table do not apply. 



or fastened in an approved manner to other 
materials. 

704.4.4 All such closet rings (closet flanges) 
shall be adequately designed and secured to 
support fixtures connected thereto. 

704.4.5 Closet screws, bolts, washers, and 
similar fasteners shall be of brass, copper, or 
other listed, equally corrosion-resistant 
materials. All such screws and bolts shall be of 
adequate size and number to properly support 
the fixture installed. 

705.0 Joints and Connections. 

705.1 Types of Joints. 

705.1.1 Caull<ed Joints. Caulked joints for cast- 
iron bell-and-spigot soil pipe and other similar 
joints shall be firmly packed with oakum or 
hemp and filled with molten lead to a depth of 
not less than one (1) inch (25.4 mm). The lead 
shall be caulked thoroughly at the inside and 
outside edges of the joint. After caulking, the 
finished joint shall not extend more than one- 
eighth (1/8) inch (3.2 mm) below the rim of the 



hub. No paint, varnish, or other coatings shall be 
permitted on the joining material until after the 
joint has been tested and approved. Caulked 
joints in cast-iron bell-and-spigot w^ater piping 
shall be made with nontoxic materials. 

705.1.2 Cement l\/lortar Joints. Except for 
repairs and connections to existing lines 
constructed with such joints, cement mortar 
joints shall be prohibited on building sewers. 

705.1.3 Burned Lead Joints. Burned (welded) 
lead joints shall be lapped, and the lead shall be 
fused together to form a uniform weld at least as 
thick as the lead being joined. 

705.1.4 Asbestos Cement Sewer Pipe Joints. 

Joints in asbestos cement pipe shall be a sleeve 
coupling of the same composition as the pipe or 
of other approved materials, and sealed with 
rubber rings or joined by an approved-type 
compression coupling. Joints between asbestos 
cement pipe and other approved pipe shall be 
made by means of an approved adapter coupling. 

705.1.5 Pacl<ing Additives Proliibited. The 

addition of leak-sealing additives to joint packing 
shall be prohibited. 



114 



SANITARY DRAINAGE 



705.1 - 707.3 



705.1.6 Molded Rubber Coupling Joints. When 
pipe is joined by means of molded rubber 
coupling joints, such joints shall conform to 
approved standards and shall not be considered 
as slip joints. When required, appropriate rubber 
bushings shall be used to allow for any difference 
in piping material diameters. 

705.1.7 Elastomeric Gasketed and Rubber-Ring 
Joints. Elastom^eric gasketed and rubber-ring 
joints shall comply with the applicable Installa- 
tion Standard listed in Appendix I. 

705.1.8 Shielded Coupling Joints. When piping 
systems are joined by means of shielded 
couplings, such couplings shall conform to 
approved standards and shall not be considered 
as slip joints. 

705.1.9 Hubless Cast-Iron Pipe Joints. Joints for 
hubless cast-iron soil pipe and fittings shall 
conform to appropriate Installation Standards 
listed in Appendix I and shall not be considered 
as slip joints. 

705.2 Use of Joints. 

705.2.1 Clay and Sewer Pipe. Joints in vitrified 
clay pipe or between such pipe and metal pipe 
shall be made as provided in Section 316.1.5, 
705.1.2, 705.1.6, or 705.1.8. 

705.2.2 Cast-iron Pipe. Joints in cast-iron pipe 
shall be made as provided in Section 316.1.1, 
316.1.5, 606.1.2, 705.1.1, 705.1.8, or 705.1.9. 

705.2.3 Screw Pipe to Cast Iron. Joints between 
wrought iron, steel, brass, or copper pipe and 
cast-iron pipe shall be either caulked or threaded 
joints made as provided in Section 316.1.1 or 
705.1.1, or shall be made with approved adapter 
fittings. 

705.2.4 Lead to Cast Iron, Wrought iron, or Steel. 

Joints between lead and cast-iron, wrought-iron, 
or steel pipe shall be made by means of wiped 
joints to a caulking ferrule, soldering nipple, or 
bushing as provided in Section 316.1.2. 

705.3 Special Joints. 

705.3.1 Slip Joints. In fixture drains and traps, 
slip joints of approved materials may be used in 
accordance with their approvals. 

705.3.2 Expansion Joints. Expansion joints shall 
be accessible, except when in vent piping or 
drainage stacks, and may be used where nec- 
essary to provide for expansion and contraction 
of the pipes. 

705.3.3 Ground Joint, Flared, or Ferrule 
Connections. Brass or copper groimd joint, flared, 
or ferrule-type connections that allow adjustment 



of tubing, but provide a rigid joint when made up, 
shall not be considered as sUp joints. 

706.0 Changes in Direction of Drainage Flow. 

706.1 Changes in direction of drainage piping shall 
be made by the appropriate use of approved fittings 
and shall be of the angles presented by a one- 
sixteenth (1/16) bend, one-eighth (1/8) bend, or one- 
sixth (1/6) bend, or other approved fittings of 
equivalent sweep. 

706.2 Horizontal drainage lines, cormecting with a 
vertical stack, shall enter through forty-five (45) 
degree (0.79 rad) wye branches, sixty (60) degree 
(1.05 rad) wye branches, combination wye and 1/8 
bend branches, sanitary tee or sanitary tapped tee 
branches, or other approved fittings of equivalent 
sweep. No fitting having more than one (1) inlet at 
the same level shall be used unless such fitting is 
constructed so that the discharge from one (1) inlet 
cannot readily enter any other inlet. Double sanitary 
tees may be used when the barrel of the fitting is at 
least two (2) pipe sizes larger than the largest inlet, 
(pipe sizes recognized for this purpose are 2 in., 2- 
1/2 in., 3 in., 3-1/2 in., 4 in., 4-1/2 in., 5 in., 6 in., etc.) 
(50, 65, 80, 90, 100, 115, 125, 150 mm, etc.). 

706.3 Horizontal drainage lines connecting with 
other horizontal drainage lines shall enter 
through forty-five (45) degree (0.79 rad) wye 
branches, combination wye and one-eighth (1/8) 
bend branches, or other approved fittings of 
equivalent sweep. 

706.4 Vertical drainage lines connecting with 
horizontal drainage lines shall enter through forty- 
five (45) degree (0.79 rad) wye branches, combination 
wye and one-eighth (1/8) bend branches, or other 
approved fittings of equivalent sweep. Sixty (60) 
degree (1.05 rad) branches or offsets may be used 
only when installed in a true vertical position. 

707.0 Cleanouts. 

707.1 Each cleanout fitting for cast-iron pipe shall 
consist of a cast-iron or brass body and an approved 
plug. Each cleanout for galvanized wrought-iron, 
galvanized steel, copper, or brass pipe shall consist 
of a brass plug as specified in Table 7-6, or a standard 
weight brass cap, or an approved ABS or PVC plastic 
plug, or an approved stainless steel cleanout or plug. | 
Plugs shall have raised square heads or approved 
countersunk rectangular slots. 

707.2 Each cleanout fitting and each cleanout plug or 
cap shall be of an approved type. 

707.3 Cleanouts shall be designed to be gas and 
watertight. 



115 



707.4 - 708.0 



UNIFORM PLUMBING CODE 



707.4 Each horizontal drainage pipe shall be 
provided with a cleanout at its upper terminal, and 
each run of piping, that is more than one hundred 
(100) feet (30,480 mm) in total developed length, 
shall be provided with a cleanout for each one 
hundred (100) feet (30,480 mm), or fraction thereof, 
in length of such piping. 

Exceptions: 

(1) Cleanouts may be omitted on a horizontal 
drain line less than five (5) feet (1524 mm) in 
length unless such line is serving sinks or 
urinals. 

(2) Cleanouts may be omitted on any horizontal 
drainage pipe installed on a slope of 
seventy- two (72) degrees (1.26 rad) or less 
from the vertical angle (angle of one-fifth 
(1/5) bend). 

(3) Excepting the building drain and its 
horizontal branches, a cleanout shall not be 
required on any pipe or piping that is 
above the floor level of the lowest floor of 
the building. 

(4) An approved type of two-way cleanout 
fitting, installed inside the building wall 
near the connection between the building 
drain and the building sewer or installed 
outside of a building at the lower end of a 
building drain and extended to grade, may 
be substituted for an upper terminal 
cleanout. 

707.5 An additional cleanout shall be provided in a 
drainage line for each aggregate horizontal change of 
direction exceeding one hundred and thirty-five (135) 
degrees (2.36 rad). 

707.6 Each cleanout shall be installed so that it opens 
to allow cleaning in the direction of flow of the soil or 
waste or at right angles thereto and, except in the case 
of wye branch and end-of-line cleanouts, shall be 
installed vertically above the flow line of the pipe. 

707.7 Each cleanout extension shall be considered as 
drainage piping and each ninety (90) degree (1.6 rad) 
cleanout extension shall be extended from a wye-type 
fitting or other approved fitting of equivalent sweep. 

707.8 Each cleanout for an interceptor shall be 
outside of such interceptor. 

707.9 Each cleanout, unless installed under an 
approved cover plate, shall be above grade, readily 
accessible, and so located as to serve the purpose for 
which it is intended. Cleanouts located under cover 
plates shall be so installed as to provide the clearances 
and accessibility required by this section. 

707.10 Each cleanout in piping two (2) inches (50 
mm) or less in size shall be so installed that there is a 
clearance of not less than twelve (12) inches (305 



mm) in front of the cleanout. Cleanouts in piping 
larger than two (2) inches (50 mm) shall have a 
clearance of not less than eighteen (18) inches (457 
mm) in front of the cleanout. Cleanouts in under- 
floor piping shall be extended to or above the finished 
floor or shall be extended outside the building when 
there is less than eighteen (18) inches (457 mm) 
vertical overall, allowing for obstructions such as 
ducts, beams, and piping, and thirty (30) inches of 
(762 mm) horizontal clearance from the means of 
access to such cleanout. No under-floor cleanout 
shall be located more than twenty (20) feet (6096 
mm) from an access door, trap door, or crawl hole. 

707.1 1 Cleanout fittings shall be not less in size than 
those given in Table 7-6. 

707.12 Cleanouts shall be provided for pressure 
drainage systems as classified under Section 710.7. 

707.13 Countersimk cleanout plugs shall be installed 
where raised heads may cause a hazard. 

707.14 When a hubless blind plug is used for a 
required cleanout, the complete coupling and plug 
shall be accessible for removal or replacement. 

708.0 Grade of Horizontal Drainage Piping. 

Horizontal drainage piping shall be run in practical 
alignment and a Uniform slope of not less than one- 
fourth (1/4) inch per foot (20.9 mm/m) or two (2) 
percent toward the point of disposal provided that, 
where it is impractical due to the depth of the street 
sewer or to the structural features or to the 

Table 7-8 
Cleanouts 



Size of Pipe 


Size of Cleanout 


Threads 


(inches) 


(inches) 


(per inches) 


1-1/2 


1-1/2 


11-1/2 


2 


1-1/2 


11-1/2 


2-1/2 


2-1/2 


8 


3 


2-1/2 


8 


4 & larger 


3-1/2 


8 




TABLE 7-6 






Cleanouts (Metric) 




Size of Pipe 


Size of Cleanout 


Threads 


(mm) 


(mm) 


(per 25.4 mm) 


40 


38 


11-1/2 


50 


38 


11-1/2 


65 


64 


8 


80 


64 


8 


100 & larger 


89 


8 



116 



SANITARY DRAINAGE 



708.0-710.9 



arrangement of any building or structure to obtain a 
slope of one-fourth (1/4) of an inch per foot (20.9 
mm/m) or two. (2) percent, any such pipe or piping 
four (4) inches (100 mm) or larger in diameter may 
have a slope of not less than one-eighth (1/8) of an 
inch per foot (10.5 mm/m) or one (1) percent, when 
first approved by the Authority Having Jurisdiction. 

709.0 Gravity Drainage Required. 

Wherever practicable, all plumbing fixtures shall be 
drained to the public sewer or private sewage 
disposal system by gravity. 

710.0 Drainage of Fixtures Located Below the Next 
Upstream Manliole or Below the Main Sewer Level. 

710.1 Where a fixture is installed on a floor level that 
is lower than the next upstream manhole cover of the 
public or private sewer, serving such drainage piping, 
shall be protected from backflow of sewage by 
installing an approved type of backwater valve. 
Fixtures on floor levels above such elevation shaU not 
discharge through the backwater valve. 

710.2 Drainage piping serving fixtures that are 
located below the crown level of the main sewer 
shall discharge into an approved watertight sump or 
receiving tank, so located as to receive the sewage or 
wastes by gravity. From such sump or receiving 
tank, the sewage or other liquid wastes shall be lifted 
and discharged into the building drain or building 
sewer by approved ejectors, pumps, or other equally 
efficient approved mechanical devices. 

710.3 A sewage ejector or sewage pump receiving 
the discharge of water closets or urinals: 

710.3.1 Shall have a minimum discharge 
capacity of twenty (20) gallons (75.7 liters) per 
minute. 

710.3.2 In single dwelling units, the ejector or 
pump shall be capable of passing a one and one- 
half (1-1/2) inch (38 mm) diameter solid ball, 
and the discharge piping of each ejector or 
pump shall have a backwater valve and gate 
valve, and be a minimum of two (2) inches 
(51mm) in diameter. 

710.3.3 In other than single-dwelling imits, the 
ejector or pump shall be capable of passing a 
two (2) inch (51 mm) diameter solid ball, and the 
discharge piping of each ejector or pump shall 
have a backwater valve and gate valve, and be a 
minimum of three (3) inches (80 mm) in diameter. 

710.4 The discharge line from such ejector, pump, or 
other mechanical device shall be provided with an 
accessible backwater or swing check valve and gate 
or ball valve. If the gravity drainage line to which 
such discharge line connects is horizontal, the 



method of connection shall be from the top through 
a wye branch fitting. The gate or ball valve shall be 
located on the discharge side of the backwater or 
check valve. 

Gate or ball valves, when installed in drainage 
piping, shall be fuUway type with working parts of 
corrosion-resistant metal. Sizes four (4) inches 
(100mm) or more in diameter shah have cast-iron 
bodies, and sizes less than four (4) inches (100 mm), 
cast-iron or brass bodies. 

710.5 Building drains or building sewers receiving 
discharge from any pump or ejector shall be 
adequately sized to prevent overloading. Two (2) 
fixture units shall be allowed for each gallon per 
minute (0.06 L/s) of flow. 

710.6 Backwater valves, gate valves, fullway ball 
valves, unions, motors, compressors, air tanks, and 
other mechanical devices required by this section 
shall be located where they will be accessible for 
inspection and repair at all times and, unless 
continuously exposed, shall be enclosed in a 
masonry pit fitted with an adequately sized 
removable cover. 

Backwater valves shall have bodies of cast iron, 
plastic, brass, or other approved materials; shall have 
noncorrosive bearings, seats, and self-aligning discs; 
and shall be constructed so as to ensure a positive 
mechanical seal. Such backwater valves shaU remain 
sufficiently open during periods of low flows to avoid 
screening of solids and shall not restrict capacities or 
cause excessive turbulence during peak loads. Unless 
otherwise listed, valve access covers shall be bolted 
type with gasket, and each valve shall bear the 
manufachirer's name cast into the body and the cover. 

710.7 The drainage and venting systems, in connec- 
tion with fixtures, sumps, receiving tanks, and 
mechanical waste-lifting devices, shall be installed 
under the sarrie requirements as provided for in this 
code for gravity systems. 

710.8 Sumps and receiving tanks shall be watertight 
and shall be constructed of concrete, metal, or other 
approved materials. If constructed of poured concrete, 
the walls and bottom shall be adequately reinforced 
and designed to recognized acceptable standards. 
Metal sumps or tanks shall be of such thickness as to 
serve their intended purpose and shall be treated 
internally and externally to resist corrosion. 

710.9 All such sumps and receiving tanks shall be 
automatically discharged and, when in any "public 
use" occupancy, shall be provided with dual pumps 
or ejectors arranged to function alternately in normal 
use and independently in case of overload or 
mechanical failure. The pumps shall have an audio 
and visual alarni, readily accessible, that signals 



117 



710.9-712.3 



UNIFORM PLUMBING CODE 



pump failure or an overload condition. The lowest 
inlet shall have a minimum clearance of two (2) 
inches (51 mm) from the high-water or "starting" 
level of the sump. 

710.10 Sumps and receiving tanks shall be provided 
with substantial covers having a bolt-and-gasket- 
type manhole or equivalent opening to permit access 
for inspection, repairs, and cleaning. The top shall be 
provided with a vent pipe that shall extend 
separately through the roof or, when permitted, may 
be combined with other vent pipes. Such vent shall 
be large enough to maintain atmospheric pressure 
within the sump under all normal operating 
conditions and, in no case, shall be less in size than 
that required by Table 7-5 for the number and type 
of fixtures discharging into the sump, nor less than 
one and one-half (1-1/2) inches (40 mm) in diameter. 
When the foregoing requirements are met and the 
vent, after leaving the sump, is combined with vents 
from fixtures discharging into the sump, the size of 
the combined vent need not exceed that required for 
the total number of fixtures discharging into the 
sump. No vent from an air-operating sewage ejector 
shall combine with other vents. 

710.11 Air tanks shall be so proportioned as to be of 
equal cubical capacity to the ejectors connected 
therewith in which there shall be maintained an air 
pressure of not less than two (2) pounds for each foot 
(3 kg for each m) of height the sewage is to be raised. 
No water-operated ejectors shall be permitted. 

710.12 Grinder Pump Ejector. Grinder pumps shall 
be permitted to be used. 

710.13 Macerating Toilet Systems. Listed macerating 
toilet systems shall be permitted as an alternate to a 
sewage pump system when approved by the 
Authority Having Jurisdiction. 

710.13.1 Sumps. The sump shall be water- and 
gastight. 

710.13.2 Discharge Piping. The discharge piping 
shall be sized per manufacturer's instructions 
and shall be not less than 3/4 inches (20 mm) in 
diameter. The developed length of the discharge 
piping shall not exceed the manufacturer's 
recommendations. A check valve and fullway- 
type shutoff valve shall be located within the 
discharge line or internally within the device. 

710.13.3 Venting. The plumbing fixtures that 
discharge into the macerating device shall be 
vented per this code. The sump shall be vented 
per manufacturer's instructions and such vent 
shall be permitted to connect to the fixture 
venting. 



71 1.0 Suds Relief. 

Drainage connections shall not be made into a 
drainage piping system within eight (8) feet (2438 
mm) of any vertical to horizontal change of direction 
of a stack containing suds-producing fixtures. 
Bathtubs, laundries, washing machine standpipes, 
kitchen sinks, and dishwashers shall be considered 
suds-producing fixtures. Where parallel vent stacks 
are required, they shall cormect to the drainage stack 
at a point eight (8) feet (2,438 mm) above the lowest 
point of the drainage stack. 

Exceptions: 

(1) Single-family residences. 

(2) Stacks receiving the discharge from less than 
three (3) stories of plumbing fixtures. 

712.0 Testing. 

712.1 Media. The piping of the plumbing, drainage, 
and venting systems shall be tested with water or air 
except that plastic pipe shall not be tested with air. 
The Authority Having Jurisdiction may require the 
removal of any cleanouts, etc., to ascertain whether 
the pressure has reached all parts of the system. 
After the plumbing fixtures have been set and their 
traps filled with water, they shall be submitted to a 
final test. 

712.2 Water Test. The water test shall be applied to 
the drainage and vent systems either in its entirety or 
in sections. If the test is applied to the entire system, 
all openings in the piping shall be tightly closed, 
except the highest opening, and the system filled with 
water to point of overflow. If the system is tested in 
sections, each opening shall be tightly plugged, 
except the highest opening of the section under test, 
and each section shall be filled with water, but no 
section shall be tested with less than a ten (10) foot 
(3048 mm) head of water. In testing successive 
sections, at least the upper ten (10) feet (3048 mm) of 
the next preceding section shall be tested, so that no 
joint or pipe in the building (except the uppermost 
ten (10) feet (3048 nrni) of the system) shall have been 
submitted to a test of less than a ten (10) foot (3048 
mm) head of water. The water shall be kept in the 
system, or in the portion under test, for at least fifteen 
(15) minutes before inspection starts. The system shall 
then be tight at all points. 

712.3 Air Test. The air test shall be made by 
attaching an air compressor testing apparatus to any 
suitable opening and, after closing all other inlets 
and outlets to the system, forcing air into the system 
until there is a uniform gauge pressure of five (5) 
pounds per square inch (34.5 kPa) or sufficient to 
balance a column of mercury ten (10) inches (254 
mm) in height. The pressure shall be held without 
introduction of additional air for a period of at least 
fifteen (15) minutes. 



118 



SANITARY DRAINAGE 



713.0-717.0 



Part II - Building Sewers. 

713.0 Sewer Required. 

713.1 Every building in which plumbing fixtures are 
installed and every premises having drainage piping 
thereon shall have a connection to a public or private 
sewer, except as provided in Sections 101.4.1.3, 713.2, 
and 713.4. 

713.2 When no public sewer intended to serve any lot 
or premises is available in any thoroughfare or right 
of way abutting such lot or premises, drainage piping 
from any building or works shall be connected to an 
approved private sewage disposal system. 

713.3 Within the limits prescribed by Section 713.4 
hereof, the rearrangement or subdivision into smaller 
parcels of a lot that abuts and is served by a public 
sewer shall not be deemed cause to permit the 
construction of a private sewage disposal system, and 
aU plumbing or drainage systems on any such smaller 
parcel or parcels shall connect to the public sewer. 

713.4 The public sewer may be considered as not 
being available when such public sewer or any 
building or any exterior drainage facility connected 
thereto is located more than two hundred (200) feet 
(60.8 m) from any proposed building or exterior 
drainage facility on any lot or premises that abuts 
and is served by such public sewer. 

713.5 No permit shall be issued for the installation, 
alteration, or repair of any private sewage disposal 
system, or part thereof, on any lot for which a 
connection with a public sewer is available. 

713.6 On every lot or premises hereafter connected 
to a public sewer, all plumbing and drainage systems 
or parts thereof on such lot or premises shall be 
connected with such public sewer. 

Exception: Single-family dwellings and buildings 
or structures accessory thereto, existing and 
connected to an approved private sewage 
disposal system prior to the time of cormecting 
the premises to the public sewer may, when no 
hazard, nuisance, or insanitary condition is 
evidenced and written permission has been 
obtained from the Authority Having Jurisdiction, 
remain connected to such properly maintained 
private sewage disposal system when there is 
insufficient grade or fall to permit drainage to 
the sewer by gravity. 

714.0 Damage to Public Sewer or Private Sewage 
Disposal System. 

714.1 It shall be unlawful for any person to deposit, 
by any means whatsoever, into any plumbing fixture, 
floor drain, interceptor, sump, receptor, or device 



which is connected to any drainage system, public 
sewer, private sewer, septic tank, or cesspool, any 
ashes; cinders; solids; rags; flammable, poisonous, or 
explosive liquids or gases; oils; grease; and any other 
thing whatsoever that would or could cause damage 
to the public sewer, private sewer, or private sewage 
disposal system. 

714.2 No rain, surface, or subsurface water shall be 
connected to or discharged into any drainage 
system, unless first approved by the Authority 
Having Jurisdiction. 

714.3 No cesspool, septic tank, seepage pit, or 
drainfield shall be coimected to any public sewer or 
to any building sewer leading to such public sewer. 

714.4 The Authority Having Jurisdiction shall review 
before approval, the installation of a commercial food 
waste grinder connecting to a private sewage disposal 
system. 

714.5 An approved-type watertight sewage or 
wastewater holding tank, the contents of which, due 
to their character, must be periodically removed and 
disposed of at some approved off-site location, shall 
be installed only when required by the Authority 
Having Jurisdiction or the Health Officer to prevent 
anticipated surface or subsurface contamination or 
pollution, damage to the public sewer, or other 
hazardous or nuisance conditions. 



715.0 Building Sewer Materials. 

715.1 The building sewer, beginning two (2) feet (610 
mm) from any building or structure, shall be of such 
materials as prescribed in this code. | 

715.2 Joining methods and materials shall be as 
prescribed in this code. 

715.3 Replacement of existing building sewer and 
building storm sewers using trenchless methodology 
and materials shall be installed in accordance with 
lAPMO IS-26. 

716.0 Markings. 

All pipe, brick, block, prefabricated septic tanks, 
prefabricated septic tank or seepage pit covers, or 
other parts or appurtenances incidental to the 
installation of building sewers or private sewage 
disposal systems shall conform to the approval 
requirements of Chapter 3 of this code. 

717.0 Size of Building Sewers. 

The minimum size of any building sewer shall be 
determ^ined on the basis of the total number of 



TIA 
TIA 
TIA 
TIA 
TIA 



119 



717.0-720.0 



UNIFORM PLUMBING CODE 



fixture units drained by such sewer, in accordance 
with Table 7-8. No building sewer shall be smaller 
than the building drain. 

For alternate methods of sizing building sewers, 
see Appendix L. 

718.0 Grade, Support, and Protection of Building 
Sewers. 

718.1 Building sewers shall be run in practical 
alignment and at a uniform slope of not less than 
one-fourth (1/4) of an inch per foot (20.9 mm/m) 
toward the point of disposal. 

Exception: When approved by the Authority 
Having Jurisdiction and where it is impractical, 
due to the depth of the street sewer or to the 
structural features or to the arrangement of any 
building or structure, to obtain a slope of one- 
fourth (1/4) of an inch per foot (20.9 mm/m), 
any such pipe or piping four (4) inches (100 mm) 
through six (6) inches (150 mm) may have a 
slope of not less than one-eighth (1/8) inch per 
foot (10.5 mm/m) and any such piping eight (8) 
inches (200 rrmi) and larger may have a slope of 
not less than one-sixteenth (1/16) of an inch per 
foot (5.3 mm/m). 

718.2 Building sewer piping shall be laid on a firm 
bed throughout its entire length, and any such 
piping laid in made or filled-in ground shall be laid 
on a bed of approved materials and shall be properly 
supported as required by the Authority Having 
Jurisdiction. 

71 8.3 No building sewer or other drainage piping or 
part thereof, which is constructed of materials other 
than those approved for use under or within a 
building, shall be installed under or within two (2) 
feet (610 mm) of any building or structure, or part 
thereof, nor less than one (1) foot (305 mm) below the 
surface of the ground. The provisions of this 
subsection include structures such as porches and 
steps, whether covered or uncovered; brpezeways; 
roofed porte cocheres; roofed patios; carports; 
covered walks; covered driveways; and similar 
structures or appurtenances. 

719.0 Cleanouts. 

719.1 Cleanouts shall be placed inside the building 
near the connection between the building drain and 
the building sewer or installed outside the building 
at the lower end of the building drain and extended 
to grade. 

Additional building sewer cleanouts shall be 
installed at intervals not to exceed one hundred (100) 
feet (30,480 mm) in straight runs and for each 



aggregate horizontal change in direction exceeding 
one hundred thirty-five (135) degrees (2.36 rad). 

719.2 When a building sewer or a branch thereof does 
not exceed ten (10) feet (3,048 mm) in length and is a 
straight-line projection from a building drain that is 
provided with a cleanout, no cleanout will be required 
at its point of connection to the building drain. 

71 9.3 All required building sewer cleanouts shall be 
extended to grade and shall comply with all 
appropriate sections of Cleanouts, Section 707.0, for 
sizing, construction, and materials. When building 
sewers are located under buildings, the cleanout 
requirements of Section 707.0 shall apply. 

719.4 Each cleanout shall be installed so that it opens 
to allow cleaning in the direction of flow of the soil or 
waste or at right angles thereto and, except in the case 
of wye branch and end-of-line cleanouts, shall be 
installed vertically above the flow line of the pipe. 

719.5 Cleanouts installed under concrete or asphalt 
paving shall be made accessible by yard boxes or by 
extending flush with paving with approved materials 
and shall be adequately protected. 

719.6 Approved manholes may be installed in lieu 
of cleanouts, when first approved by the Authority 
Having Jurisdiction. The maximum distance 
between manholes shall not exceed three hundred 
(300) feet (91.4 m). 

The inlet and outlet connections shall be made 
by the use of a flexible compression joint no closer 
than twelve (12) inches (305 mm) to and not farther 
than three (3) feet (914 mrn) from the manhole. No 
flexible compression joints shall be embedded in the 
manhole base. 

720.0 Sewer and Water Pipes. 

Building sewers or drainage piping of clay or materi- 
als that are not approved for use within a building 
shall not be run or laid in the same trench as the 
water pipes unless both of the following 
requirements are met: 

(1) The bottom of the water pipe, at all points, 
shall be at least twelve (12) inches (305 mm) 
above the top of the sewer or drain line. 

(2) The water pipe shall be placed on a solid 
shelf excavated at one side of the common 
trench with a minimum clear horizontal 
distance of at least twelve (12) inches (305 
mm) from the sewer or drain line. 

Water pipes crossing sewer or drainage 
piping constructed of clay or materials 
that are not approved for use within a 
building shall be laid a minimum of twelve 
(12) inches (305 mm) above that sewer or 
drain pipe. 



120 



SANITARY DRAINAGE 



720.0 - Table 7-8 



Note: 

For the purpose of this section, "within the 
building" shall mean within the fixed limits of 
the building foundation. 

721.0 Location. 

721.1 Except as provided in Section 721.2, no 
building sewer shall be located in any lot other than 
the lot that is the site of the building or structure 
served by such sewer nor shall any building sewer 
be located at any point having less than the 
minimum distances indicated in Table 7-7. 

721.2 Nothing contained in this code shall be 
construed to prohibit the use of all or part of an 
abutting lot to: 

(1) Provide access to cormect a building sewer to an 
available public sewer when proper cause and 
legal easement, not in violation of other 



requirements, has been first established to the 
satisfaction of the Authority Having Jurisdiction. 

(2) Provide additional space for a building sewer 
when proper cause, transfer of ownership, or 
change of boundary, not in violation of other 
requirements, has been first established to the 
satisfaction of the Authority Having Jurisdiction. 
The instrument recording such action shall 
constitute an agreement with the Authority 
Having Jurisdiction and shall clearly state and 
show that the areas so joined or used shall be 
maintained as a unit during the time they are so 
used. Such an agreement shall be recorded in the 
office of the County Recorder as part of the 
conditions of ownership of said properties, and 
shall be binding on all heirs, successors, and 
assigns to such properties. A copy of the 
instrument recording such proceedings shall be 
filed with the Authority Having Jurisdiction. 



TABLE 7-7 
Minimum Horizontal Distance Required From Building Sewer 

Buildings or structures' ..2feet (610mm) 

Property line adjoining private 

property......... Clear' 

Water supply wells .50 feet' (15,240 mm) 

Streams.. 50 feet (15,240 mm) 

On-site domestic water 

service line 1 foot' (305 mm) 

Public water main .10 feet'' (3,048 mm) 

Note: 

' Including porches and steps, whether covered or uncovered; breezewayis; roofed portecocheres; roofed patios; carports; 
covered walks; covered driveways; and similar structures or appurtenances. 

^ See also Section 313.3. 

^ All drainage piping shall clear domestic water supply wells by at least fifty (50) feet (15,240 mm). This distance may be reduced 
to not less than twenty-five (25) feet (7,620 mm) when the drainage piping is constructed of materials approved for use within a 
building. 

" See Section 720.0. 

^ For parallel construction. 

^ For crossings, approval by the Health Department or Authority Having Jurisdiction shall be required. 



TABLE 7-8 
Maximum/Minimum Fixture Unit Loading on Building Sewer Piping 



Size of Pipe, 
Inches (mm) 

6 and smaller (150) 
8 (200) 

10 (250) 

12 (300) 



Slope, Inches per Foot (mm/m) 
1/16(5.3) 1/8(10.5) 1/4(20.9) 

(As specified in Table 7-5/No minimum loading) 
1,950/i,500 2,800/625 3,900/275 

3,400/1 ,600 4,900/675 6,800/300 

5,600/1 ,700 8,000/725 1 1 ,200/325 



See also Appendix K, Private Sewage Disposal Systems. For alternate methods of sizing drainage piping, see 
Appendix L 



121 



722.0 - 723.0 



UNIFORM PLUMBING CODE 



722.0 Abandoned Sewers and Sewage Disposal 
Facilities. 

722.1 Every abandoned building (house) sewer, or 
part thereof, shall be plugged or capped in an 
approved manner within five (5) feet (1,524 mm) of 
the property line. 

722.2 Every cesspool, septic tank, and seepage pit 
that has been abandoned or has been discontinued 
otherwise froni further use, or to which no waste or 
soil pipe from a plumbing fixture is connected, shall 
have the sewage removed therefrom and be 
completely filled with earth, sand, gravel, concrete, 
or other approved material. 

722.3 The top cover or arch over the cesspool, septic 
tank, or seepage pit shall be removed before filling, 
and the filling shall not extend above the top of the 
vertical portions of the sidewalls or above the level 
of any outlet pipe until inspection has been called 
and the cesspool, septic tank, or seepage pit has been 
inspected. After such inspection, the cesspool, septic 
tank, or seepage pit shall be filled to the level of the 
top of the ground. 

722.4 No person owning or controlling any cesspool, 
septic tank, or seepage pit on the premises of such 
person or in that portion of any public street, alley, or 
other public property abutting such premises, shall 
fail, refuse, or neglect to comply with the provisions 
of this section or upon receipt of notice so to comply 
from the Authority Having Jurisdiction. 

722.5 Where disposal facilities are abandoned 
consequent to connecting any premises with the 
public sewer, the permittee making the connection 
shall fill all abandoned facilities as required by the 
Authority Having Jurisdiction within thirty (30) days 
from the time of connecting to the public sewer. 

723.0 Building Sewer Test. 

Building sewers shall be tested by plugging the end 
of the building sewer at its points of connection with 
the public sewer or private sewage disposal system 
and completely filling the building sewer with water 
from the lowest to the highest point thereof, or by 
approved equivalent low-pressure air test. The 
building sewer shall be watertight at all points. 



122 



CHAPTER 8 

INDIRECT WASTES 



801.0 Indirect Wastes. 

801.1 Alrgap or Airbreak Required. All indirect 
waste piping shall discharge into the building 
drainage system through an airgap or airbreak as set 
forth in this code. Where a drainage airgap is 
required by this code, the mininium vertical distance 
as measured from the lowest point of the indirect 
waste pipe or the fixture outlet to the flood-level rim 
of the receptor shall be not less than one (1) inch 
(25.4 mm). 

801.2 Food and Beverage Handling Establishments. 

Establishments engaged in the storage, preparation, 
selling, serving, processing, or other handling of food 
and beverage involving the following equipment that 
requires drainage shall provide indirect waste piping 
for refrigerators, refrigeration coils, freezers, walk-in 
coolers, iceboxes, ice-making machines, steam tables, 
egg boilers, coffee urns and brewers, hpt-and-cold 
drink disperisers, and similar equipment. 

801.2.1 Except for refrigeration coils and ice- 
making machines, the minimum size of the 
iiidirect waste pipe shall not be smaller than the 
drain on the unit, but shall not be smaller than 
one (1) inch (25 mm), and the maximum 
developed length shall not exceed fifteen (15) 
feet (4,572 mm). Indirect waste pipe for ice- 
making machines shall not be less than the drain 
on the unit, but shall not be less than three- 
quarters (3/4) inch (20 mm). 

801 .2.2 For walk-in coolers, floor drains may be 
connected to a separate drainage line discharging 
into an outside receptor. The flood-level rim of 
the receptor shall be a minimum of six (6) inches 
(152 mm) lower than the lowest floor drain. Such 
floor drains shall be trapped and individually 
vented. Cleanouts shall be provided at every 
ninety (90) degree (1.6 rad) turn and shall be 
accessibly located. Such waste shall discharge 
through an airgap or airbreak into a trapped and 
vented receptor, except that a full-size airgap is 
required where the indirect waste pipe may be 
imder vacuimi. 

801 .2.3 Food-preparation sinks, steam kettles, 
potato peelers, ice cream dipper wells, and 
similar equipment shall be indirectly connected 
to the drainage system by means of an airgap. 
Bins, sinks, and other equipment having 
drainage connections and used for the storage of 
unpackaged ice used for human ingestion, or 



used in direct contact with ready-to-eat food, 
shall be indirectly connected to the drainage 
system by means of an airgap. Each indirect 
waste pipe from food-handling fixtures or 
equipment shall be separately piped to the 
indirect waste receptor and shall not combine 
with other indirect waste pipes. The piping from 
the equipment to the receptor shall not be 
smaller than the drain on the unit, and it shall 
not be smaller than one-half (1/2) inch (15 mm). 

801.3 Bar and Fountain Sink Traps. Where the 
sink in a bar, soda foimtain, or counter is so located 
that the trap serving the sink cannot be vented, the 
sink drain shall discharge through an airgap or 
airbreak (see Section 801.2.3) into an approved 
receptor that is vented. The developed length from 
the fixture outlet to the receptor shall not exceed five 
(5) feet (1524 mm). 

801.4 Connections from Water Distribution 
System. Indirect waste connections shall be 
provided for drains, overflows, or relief pipes from 
potable water pressure tanks, water heaters, boilers, 
and similar equipment that is connected to the 
potable water distribution system. Such indirect 
waste connections shall be made by means of a 
water-distribution airgap constructed in accordance 
with Table 6-3. 

801.5 Sterilizers. Lines, devices, or apparatus such 
as stills, sterilizers, and similar equipment requiring 
waste connections and used for sterile materials shall 
be indirectly cormected by means of an airgap. Each 
such indirect waste pipe shall be separately piped to 
the receptor and shall not exceed fifteen (15) feet 
(4,572 mm). Such receptors shall be located in the 
same room. 

801 .6 Drip or Drainage Outlets. Appliances, devices, 
or apparatus not regularly classed as plumbing 
fixtures, but which have drip or drainage outlets, 
may be drained by indirect waste pipes discharging 
into an open receptor through either an airgap or 
airbreak (see Section 801.2.1). 

802.0 Approvals. 

No plumbing fixtures served by indirect waste pipes 
or receiving discharge therefrom shall be installed 
until first approved by the Authority Having 
Jurisdiction. 



123 



803.0 - 808.0 



UNIFORM PLUMBING CODE 



803.0 Indirect Waste Piping. 

Except as hereinafter provided, the size and 
construction of indirect waste piping shall be in 
accordance with other sections of this code 
applicable to drainage and vent piping. No vent 
from indirect waste piping shall combine with any 
sewer-connected vent, but shall extend separately to 
the outside air. Indirect waste pipes exceeding five 
(5) feet (1524 mm), but less than fifteen (15) feet 
(4,572 mm) in length shall be directly trapped, but 
such traps need not be vented. 

Indirect waste pipes less than fifteen (15) feet 
(4,572 mm) in length shall not be less than the 
diameter of the drain outlet or tailpiece of the fixture, 
appliance, or equipment served, and in no case less 
than one-half (1/2) inch (15 mm) in size. Angles and 
changes of direction in such indirect waste pipes 
shall be provided with cleanouts so as to permit 
flushing and cleaning. 

804.0 Indirect Waste Receptors. 

804.1 All plumbing fixtures or other receptors 
receiving the discharge of indirect waste pipes shall be 
approved for the use proposed and shall be of such 
shape and capacity as to prevent splashing or flooding 
and shall be located where they are readily accessible 
for inspection and cleaning. No standpipe receptor for 
any clothes washer shaU extend more than thirty (30) 
inches (762 mm), nor less than eighteen (18) inches 
(457 mm) above its trap. No trap for any clothes 
washer standpipe receptor shall be installed below the 
floor, but shall be roughed in not less than six (6) 
inches (152 mm) and not more than eighteen (18) 
inches (457 mm) above the floor. No indirect waste 
receptor shall be installed in any toilet room, closet, 
cupboard, or storeroom, nor in any other portion of a 
building not in general use by the occupants thereof; 
except standpipes for clothes washers may be 
installed in toilet and bathroom areas when the 
clothes washer is installed in the same room. 

804.2 Where water service connections are installed 
for a clothes washer, an approved method of waste 
disposal shall be provided. 

805.0 Pressure Drainage Connections. 

Indirect waste connections shall be provided for 
drains, overflows, or relief vents from the water 
supply system, and no piping or equipment carrying 
wastes or producing wastes or other discharges 
under pressure shall be directly connected to any 
part of the drainage system. 

The foregoing shall not apply to any approved 
sump pump or to any approved pressure-wasting 
plumbing fixture or device when the Authority 
Having Jurisdiction has been satisfied that the 



drainage system is adequately sized to accommodate 
the anticipated discharge thereof. 

806.0 Sterile Equipment. 

Appliances, devices, or apparatus such as stills, 
sterilizers, and similar equipment requiring water 
and waste and used for sterile materials shall be 
drained through an airgap. 

807.0 Appliances. 

807.1 Appliances, devices, equipment, or other 
apparatus not regularly classed as plumbing fixtures, 
which are equipped with pumps, drips, or drainage 
outlets, may be drained by indirect waste pipes 
discharging into an approved type of open receptor. 

807.2 When the condensate waste from air- 
conditioning coils discharges by direct cormection to 
a lavatory tailpiece or to an approved accessible inlet 
on a bathtub overflow, the connection shall be 
located in the area controlled by the same person 
controlling the air-conditioned space. 

807.3 When undiluted condensate waste from a fuel- 
burning condensing appliance is discharged into the 
drainage system, the material in the drainage system 
shall be cast iron, galvanized iron, plastic, or other 
materials approved for this use. 

Exceptions: 

(1) When the above condensate is discharged to 
an exposed fixture tailpiece and trap, such 
tailpiece and trap may be brass. 

(2) Any materials approved in Section 701.0 
may be used when data is provided that the 
condensate waste is adequately diluted. 

807.4 No domestic dishwashing machine shall be 
directly connected to a drainage system or food 
waste disposer without the use of an approved 
dishwasher airgap fitting on the discharge side of the 
dishwashing machine. Listed airgaps shall be 
installed with the flood-level (FL) marking at or 
above the flood level of the sirik or drainboard, 
whichever is higher. 

808.0 Cooling Water. 

When permitted by the Authority Having 
Jurisdiction, clean running water used exclusively as a 
cooling medium in an appliance, device, or apparatus 
may discharge into the drainage system through the 
inlet side of a fixture trap in the event that a suitable 
fixture is not available to receive such discharge. Such 
trap connection shall be by means of a pipe connected 
to the inlet side of an approved fixture trap, the upper 
end terminating iii a funnel-shaped receptacle set 



124 



INDIRECT WASTES 



808.0-811.2 



adjacent, and not less than six (6) inches (152 mm) 
above the overflow rim of the fixture. 



thereto when the normal water level of. such boiler or 
boilers is reduced not less than four (4) inches (102 mm). 



809.0 Drinking Fountains. 

Drinking fountains may be installed with indirect 
wastes. 

810.0 Steam and Hot Water Drainage Condensers 
and Sumps. 

810.1 No steam pipe shall be directly connected to 
any part of a plumbing or drainage system, nor shall 
any water having a temperature above one hundred 
and forty (140)°F (60°C) be discharged under 
pressure directly into any part of a drainage system. 
Pipes from boilers shall discharge by means of 
indirect waste piping, as determined by the 
Authority Having Jurisdiction or the boiler 
manufacturer's recommendations. Such pipes may 
be indirectly connected by discharging into an open 
or closed condenser or an intercepting sump of an 
approved type that will prevent the entrance of 
steam or such water under pressure into the 
drainage system. All closed condensers or sumps 
shall be provided with a vent that shall be taken off 
the top and extended separately, full size above the 
roof. All condensers and sumps shall be properly 
trapped at the outlet with a deep seal trap extending 
to within six (6) inches (152 mm) of the bottom of the 
tank. The top of the deep seal trap shall have a three- 
fourths (3/4) inch (19.1 mm) opening located at the 
highest point of the trap to serve as a siphon breaker. 
Outlets shall be taken off from the side in such a 
manner as to allow a waterline to be maintained that 
will permanently occupy not less than one-half (1/2) 
the capacity of the condenser or sump. All inlets 
shall enter above the waterline. Wearing plates or 
baffles shall be installed in the tank to protect the 
shell. The sizes of the blowoff line inlet, the water 
outlets, and the vent shall be as shown in Table 8-1. 
The contents of condensers receiving steam or hot 
water under pressure must pass through an open 
sump before entering the drainage system. 

810.2 Sumps, condensers, or intercepting tanks that 
are constructed of concrete shall have walls and 
bottom not less than four (4) inches (102 mm) in 
thickness, and the inside shall be cement plastered 
not less than one-half (1/2) inch (12.7 mm) in 
thickness. Condensers constructed of metal shall be 
not less than No. 12 U.S. standard gauge (0.109 inch) 
(2.77 mm), and all such metal condensers shall be 
protected from external corrosion by an approved 
bituminous coating. 

810.3 Sumps and condensers shall be provided with 
suitable means of access for cleaning and shall 
contain a volume of not less than twice the volume of 
water removed from the boiler or boilers cormected 



TABLE 8-1 

Pipe Connections in Blowoff 

Condensers and Sumps 



Boiler Blowoff 



Water Outlet 



Vent 



3/4 in.* (20 mm) 3/4 in.* (20 mm) 2 in. (50 mm) 

lin. (25 mm) 1 in. (25 mm) 2-1/2 in. (65 mm) 

1-1/4 in. (32 mm) 1-1/4 in. (32 mm) 3 in. (80 mm) 

1-1/2 in. (40 mm) 1-1/2 in. (40 mm) 4 in. (100 mm) 

2 in. (50 mm) 2 in. (50 mm) 5 in. (125 mm) 

2-1/2 in. (65 mm) 2-1/2 in. (65 mm) 6 in. (150 mm) 

*To be used only with boilers of 100 square feet (9.29 
m^) of heating surface or less. 

810.4 Strainers. Every indirect waste interceptor 
receiving discharge-containing particles that would 
clog the receptor drain shall have a readily 
removable beehive strainer. 

811.0 Cliemical Wastes. 

811.1 Chemical or industrial liquid wastes, that are 
likely to damage or increase maintenance costs on the 
sanitary sewer system, detrimentally affect sewage 
treatment, or contaminate surface or subsurface waters 
shall be pretreated to render them innocuous prior to 
discharge into a drainage system. Detailed plans and 
specifications of the pretreatment facilities shall be 
required by the Authority Having Jurisdiction. 

Piping conveying industrial, chemical, or 
process wastes from their point of origin to sewer- 
connected pretreatment facilities shall be of such 
material and design as to adequately perform itfe 
intended function to the satisfaction of the Authority 
Having Jurisdiction. Drainage discharge piping from 
pretreatment facilities or interceptors shall conform 
to standard drainage installation procedures. 

Copper tube shall not be used for chemical or 
industrial wastes as defined in this section. 

81 1 .2 Each waste pipe receiving or intended to receive 
the discharge of any fixture into which acid or 
corrosive chemical is placed, and each vent pipe 
connected thereto, shall be constructed of PP, PVDF, | 
chemical-resistant glass, high-siUcon iron pipe, or lead 
pipe with a wall thickness of not less than one-eighth 
(1/8) inch (3.2 mm); an approved type of ceramic 
glazed or unglazed vitrified clay; or other approved 
corrosion-resistant materials. 



125 



811.3-814.3 



UNIFORM PLUMBING CODE 



811.3 All jointing materials shall be of approved 
type and quality. 

811.4 Wherever practicable, all piping shall be 
readily accessible and installed with the maximum of 
clearance from other services. 

811.5 The owner shall make and keep a permanent 
record of the location of all piping and venting 
carrying chemical waste. 

81 1 .6 No chemical vent shall intersect vents for other 
services. 

811.7 Chemical wastes shall be discharged in a 
manner approved by the Authority Having 
Jurisdiction. 

811.8 The provisions in this section relative to 
materials and methods of construction shall not 
apply to installations such as photographic or X-ray 
dark rooms or research or control laboratories 
where minor amounts of adequately diluted 
chemicals are discharged. 

812.0 Clear Water Wastes. 

Water lifts, expansion tanks, cooling jackets, 
sprinkler systems, drip or overflow pans, or similar 
devices that discharge clear wastewater into the 
building drainage system shall discharge through an 
indirect waste. 

813.0 Swimming Pools. 

Pipes carrying wastewater from swimming or 
wading pools, including pool drainage and 
backwash from filters, shall be installed as an 
indirect waste. Where a pump is used to discharge 
waste pool water to the drainage system, the pump 
discharge shall be installed as an indirect waste. 

814.0 Condensate Wastes and Control. 

814.1 Condensate Disposal. Condensate from air 
washers, air-cooling coils, fuel-burning condensing 
appliances, the overflow from evaporative coolers, 
and similar water-supplied equipment or similar air- 
conditioning equipment shall be collected and 
discharged to an approved plumbing fixture or 
disposal area. If discharged into the drainage system, 
equipment shall drain by means of an indirect waste 
pipe. The waste pipe shall have a slope of not less 
than 1/8 inch per foot (10.5 mm/m) or one percent 
slope and shall be of approved corrosion-resistant 
material not smaller than the outlet size as required 
in Table 8-2 for air-cooling coils or condensing 
fuel-burning appliances, respectively. Condensate or 
wastewater shall not drain over a public way. 

814.2 Size. Air-conditioning condensate waste pipes 
shall be independent of any drainage and waste 
system and shall not be smaller than shown in Table 
8-2. 



TABLE 8-2 
Minimum Condensate Pipe Size 



Equipment Capacity 


Minimum Condensate 


in Tons of 


Pipe Diameter 


Refrigeration (kW) 


in Inches 


(mm) 


Up to 20 (Up to 70.34) 


3/4 


(20) 


21-40 (73.85-140.67) 


1 


(25) 


41-90 (144.19-316.6) 


1-1/4 


(32) 


91-125 (320.03-439.6) 


1-1/2 


(40) 


126-250 (443.12-879.2) 


2 


(50) 



The size of condensate waste pipes may be for 
one unit or a combination of units, or as 
recommended by the manufacturer. The capacity of 
waste pipes assumes a one-eighth (1/8) inch per foot 
(10.5 mm/m) or one percent slope, with the 
following pipe conditions: 



Outside Air - 20% 
DB WB 

90°F 73°F 
(32°C) (23°C) 



Room Air - 80% 
DB WB 

75°F 62.5°F 
(24°C) (17°) 



Condensate drain sizing for other slopes or other 
conditions shall be approved by the Authority 
Having Jurisdiction. 

Air-conditioning waste pipes shall be con- 
structed of materials specified in Chapter 7. 

814.3 Point of Discharge. Air-conditioning 
condensate waste pipes shall connect indirectly to the 
drainage system through an airgap or airbreak to a 
properly trapped and vented receptors dry wells, 
leach pits, or the tailpiece of plumbing fixtures. 

Condensate waste shall not drain over a public 
way. 



126 



CHAPTER 9 

VENTS 



901 .0 Vents Required. 

Each plumbing fixture trap, except as otherwise 
provided in this code, shall be protected against 
siphonage and back-pressure, and air circulation 
shall be ensured throughout all parts of the drainage 
system by means of vent pipes installed in 
accordance with the requirements of this chapter and 
as otherwise required by this code. 

902.0 Vents Not Required. 

I 902.1 Vent piping may be omitted on an inter- 
ceptor when such interceptor acts as a primary 
settling tank and discharges through a horizontal 
indirect waste pipe into a secondary interceptor. 
The second interceptor shall be properly trapped 
and vented. 

902.2 Traps serving sinks that are part of the 
equipment of bars, soda fountains, and counters 
need not be vented when the location and 
construction of such bars, soda fountains, and 
counters is such as to make it impossible to do so. 
When such conditions exist, said sinks shall 
discharge by means of approved indirect waste pipes 
into a floor sink or other approved type of receptor. 

903.0 Materials. 

903.1 Vent pipe shall be cast iron, galvanized steel, 
galvanized wrought iron, copper, brass. Schedule 40 
ABS DWV, Schedule 40 PVC DWV, stainless steel 
304 or 316L (stainless steel 304 pipe and fittings shall 
not be installed underground and shall be kept at 
least six inches (152 mm) aboveground), or other 
approved materials having a smooth and uniform 
bore except that: 

903.1.1 No galvanized wrought-iron or 
galvanized steel pipe shall be used undergroimd 
and shall be kept at least six (6) inches (152 mm) 
aboveground. 

903.1.2 ABS and PVC DWV piping installations 
shall be installed in accordance with IS 5, IS 9, 
and Chapter 15 "Firestop Protection." Except for 
individual single-family dwelling units, 
materials exposed within ducts or plenums shall 
have a flame-spread index of not more than 25 
and a smoke-developed index of not more than 
50 when tested in accordance with the Test for 
Surface-Burning Characteristics of the Building 



Materials (see the Building Code standards 
based on ASTM E-84 and ANSI/UL 723). 

903.2 Use of Copper Tubing. 

903.2.1 Copper tube for undergroimd drainage 
and vent piping shall have a weight of not less 
than that of copper drainage tube type DWV. 

903.2.2 Copper tube for aboveground drainage 
and vent piping shall have a weight of not less 
than that of copper drainage tube type DWV. 

903.2.3 Copper tube shall not be used for 
chemical or industrial wastes as defined in 
Section 811.0. 

903.2.4 All hard-drawn copper tubing, in 
addition to the required incised marking, shall 
be marked in accordance with either ASTM 
B306, Copper Drainage Tube (DWV), or ASTM 
BBS Seamless Copper Water Tube as listed in 
Table 14-1. The colors shall be: Type K, green; 
T3^e L, blue; Type M, red; Type DWV, yellow. 

903.3 Vent fittings shall be cast iron, galvanized 
malleable iron or galvanized steel, copper, brass, 
ABS, PVC, stainless steel 304 or 316L, or other | 
approved materials, except that no galvanized 
malleable iron or galvanized steel, or 304 stainless 
steel shall be used underground and shall be kept at 
least six (6) inches (152 mm) aboveground. Stainless 
steel 304 pipe and fittings shall not be installed 
underground and shall be kept at least 6 inches (152 
mm) aboveground. 

903.4 Changes in direction of vent piping shall be 
made by the appropriate use of approved fittings, 
and no such pipe shall be strained or bent. Burred 
ends shall be reamed to the full bore of the pipe. 

904.0 Size of Vents. 

904.1 The size of vent piping shall be determined 
from its length and the total number of fixture units 
connected thereto, as set forth in Table 7-5. The 
diameter of an individual vent shall not be less than 
one and one-fourth (1-1/4) inches (32 mm) nor less 
than one-half (1/2) the diameter of the drain to 
which it is connected. In addition, the drainage 
piping of each building and each connection to a 
public sewer or a private sewage disposal system 
shall be vented by means of one or more vent pipes, 
the aggregate cross-sectional area of which shall not 
be less than that of the largest required building 



127 



904.1 -907.1 



UNIFORM PLUMBING CODE 



sewer, as determined from Table 7-5. Vent pipes 
from fixtures located upstream from pumps, ejectors, 
backwater valves, or other devices that in any way 
obstruct the free flow of air and other gases between 
the building sewer and the outside atmosphere shall 
not be used for meeting the cross-sectional area 
venting requirements of this section. 

Exception: When connected to a common 
building sewer, the drainage piping of two (2) or 
more buildings located on the same lot and under 
one (1) ownership may be vented by means of 
piping sized in accordance with Table 7-5, 
provided the aggregate cross-sectional area of all 
vents is not less than that of the largest required 
common building sewer. 

904.2 No more than one-third (1/3) of the total 
permitted length, per Table 7-5, of any minimum- 
sized vent shall be installed in a horizontal position. 

Exception: When a minimum-sized vent is 
increased one (1) pipe size for its entire length, 
the maximum length limitation does not apply. 

905.0 Vent Pipe Grades and Connections. 

905.1 All vent and branch vent pipes shall be free 
from drops or sags, and each such vent shall be level 
or shall be so graded and connected as to drip back 
by gravity to the drainage pipe it serves. 

905.2 Where vents connect to a horizontal drainage 
pipe, each vent pipe shall have its invert taken off 
above the drainage centerline of such pipe 
downstream of the trap being served. 

905.3 Unless prohibited by structural conditions, 
each vent shall rise vertically to a point not less than 
six (6) inches (152 mm) above the flood-level rim of 
the fixture. served before offsetting horizontally, and 
whenever two or more vent pipes converge, each 
such vent pipe shall rise to a point at least six (6) 
inches (152 mm) in height above the flood-level rim 
of the plumbing fixture it serves before being 
connected to any other vent. Vents less than six (6) 
inches (152 mm) above the flood-level rim of the 
fixture shall be installed with approved drainage 
fittings, material, and grade to the drain. 

905.4 All vent pipes shall extend undiminished in 
size above the roof, or shall be reconnected with a 
soil or waste vent of proper size. 

905.5 The vent pipe opening from a soil or waste 
pipe, except for water closets and similar fixtures, 
shall not be below the weir of the trap. 

905.6 Two (2) fixtures may be served by a common 
vertical pipe when each such fixture wastes separately 
into an approved double fitting having inlet openings 
at the same level. 



906.0 Vent Termination. 

906.1 Each vent pipe or stack shall extend through 
its flashing and shall terminate vertically not less 
than six (6) inches (152 mm) above the roof nor less 
than one (1) foot (305 mm) from any vertical surface. 

906.2 Each vent shall terminate not less than ten (10) 
feet (3048 mm) from, or at least three (3) feet (914 
mm) above, any openable window, door, opening, 
air intake, or vent shaft, nor less than three (3) feet 
(914 mm) in every direction from any lot line, alley 
and street excepted. 

906.3 Vent pipes shall be extended separately or 
combined, of full required size, not less than six (6) 
inches (152 mm) above the roof or fire wall. 
Flagpoling of vents shall be prohibited except where 
the roof is used for purposes other than weather 
protection. All vents within ten (10) feet (3048 mm) of 
any part of the roof that is used for such other 
purposes shall extend not less than seven (7) feet 
(2,134 mm) above such roof and shall be securely 
stayed. 

906.4 Vent pipes for outdoor installations shall 
extend at least ten (10) feet (3,048 mm) above the 
surrounding ground and shall be securely supported. 

906.5 Joints at the roof around vent pipes shall be 
made watertight by the use of approved flashings or 
flashing material. 

906.6 Lead. See Table 14-1. Sheet lead shall be not 
less than the following: 

For safe pans - not less than four (4) pounds per 
square foot (19.5 kg/m^) or 1/16-inch (1.6 mm) thick. 

For flashings or vent terminals - not less than 
three (3) pounds per square foot (14.7 kg/m^) or 1.2 
mm thick. 

Lead bends and lead traps shall not be less than 
one-eighth (1 /8) inch (3.2 mm) wall thickness. 

906.7 Frost or Snow Closure. Where fiost or snow 
closure is likely to occur in locations having minimum 
design temperature below 0°F (-17.8°C), vent 
terminals shall be a minimum of two (2) inches (51 
mm) in diameter, but in no event smaller than the 
required vent pipe. The change in diameter shall be 
made inside the building at least one (1) foot (305 mm) 
below the roof in an insulated space and terminate not 
less than ten (10) inches (254 mm) above the roof, or as 
required by the Authority Having Jurisdiction. 

907.0 Vent Stacks and Relief Vents. 

907.1 Each drainage stack that extends ten (10) or 
more stories above the building drain or other 
horizontal drain, shall be served by a parallel vent 



128 



VENTS 



907.1 -910.3 



stack, which shall extend undiminished in size from 
its upper terminal and connect to the drainage stack at 
or immediately below the lowest fixture drain. Each 
such vent stack shall also be connected to the drainage 
stack at each fifth floor, counting down from the 
uppermost fixture drain, by means of a yoke vent, the 
size of which shall be not less in diameter than either 
the drainage or the vent stack, whichever is smaller. 

907.2 The yoke vent connection to the vent stack 
shall be placed not less than forty-two (42) inches 
(1,067 mm) above the floor level, and the yoke vent 
connection to the drainage stack shall be by means of 
a wye-branch fitting placed below the lowest 
drainage branch connection serving that floor. 

908.0 Vertical Wet Venting. 

908.1 Wet venting is limited to vertical drainage 
piping receiving the discharge from the trap arm of 
one (1) and two (2) fixture unit fixtures that also 
serves as a vent for not to exceed four (4) fixtures. 
All wet-vented fixtures shall be within the same 
story; provided, further, that fixtures with a 
continuous vent discharging into a wet vent shall be 
within the same story as the wet-vented fixtures. No 
wet vent shall exceed six (6) feet (1829 mm) in 
developed length. 

908.2 The vertical piping between any two (2) 
consecutive inlet levels shall be considered a wet- 
vented section. Each wet-vented section shall be a 
minimum of one (1) pipe size larger than the 
required minimum waste pipe size of the upper 
fixture or shall be one (1) pipe size larger than the 
required minimum pipe size for the sum of the 
fixture units served by such wet-vented section, 
whichever is larger, but in no case less than two (2) 
inches (51 mm). 

908.3 Common vent sizing shall be the sum of the 
fixture units served but, in no case, smaller than the 
minimum vent pipe size required for any fixture 
served, or by Section 904.0. 

908.4 Bathroom Wet Venting. 

908.4.1 Where permitted. Any combination of 
fixtures within one (1) or two (2) bathrooms 
located on the same floor level in dwellings and 
guest rooms shall be permitted to be vented by a 
wet vent. The wet vent shall be considered the 
vent for the fixtures and shall extend from the 
connection of the dry vent along the direction of 
the flow in the drain pipe to the most 
downstream fixture drain connection to the 
horizontal branch drain. Only the fixtures 
within the bathroom(s) shall connect to the wet- 
vented horizontal branch drain. Any additional 



fixtures shall discharge downstream of the wet 
vent system and be conventionally vented. 

908.4.2 Vent Connection. The dry vent 
connection to the wet vent shall be an individual 
vent or common vent for the lavatory, bidet, 
shower, or bathtub. 

908.4.3 Size. The wet vent shall be sized based 
on the fixture unit discharge into the wet vent. 
The wet vent shall be a minium size of 2 inches 
for 4 dfu or less, and 3 inches for more than 4 dfu. 

909.0 Special Venting for Island Fixtures. 

Traps for island sinks and similar equipment shall be 
roughed in above the floor and may be vented by 
extending the vent as high, as possible, but not less 
than the drainboard height and then returning it 
downward and connecting it to the horizontal sink 
drain immediately downstream from the vertical 
fixture drain. The return vent shall be connected to the 
horizontal drain through a wye-branch fitting and 
shall, in addition, be provided with a foot vent taken 
off the vertical fixture vent by means of a wye branch 
immediately below the floor and extending to the 
nearest partition and then through the roof to the 
open air, or may be connected to other vents at a point 
not less than six (6) inches (152 mm) above the flood- 
level rim of the fixtures served. Drainage fittings shall 
be used on all parts of the vent below the floor level, 
and a minimum slope of one-quarter (1/4) inch per 
foot (20.9 mm/m) back to the drain shall be 
maintained; The return bend used under the 
drainboard shall be a one (1) piece fitting or an 
assembly of a forty-five (45) degree (0.79 rad), a ninety 
(90) degree (1.6 rad), and a forty-five (45) degree (0.79 
rad) elbow in the order named. Pipe sizing shall be as 
elsewhere required in this code. The island sink drain, 
upstream of the returned vent, shall serve no other 
fixtures. An accessible cleanout shall be installed in 
the vertical portion of the foot vent. 

910.0 Combination Waste and Vent Systems. 

910.1 Combination waste and vent systems shall be 
permitted only where structural conditions preclude 
the installation of conventional systems as otherwise 
prescribed by this code. 

910.2 Plans and specifications for each combination 
waste and vent system shall first be approved by the 
Authority Having Jurisdiction before any portion of 
any such system is installed. 

910.3 Each combination waste and vent system, as 
defined in Chapter 1, shall be provided with a vent 
or vents adequate to ensure free circulation of air. 



129 



910.3-910.7 



UNIFORM PLUMBING CODE 



Any branch more than fifteen (15) feet (4,572 mm) 
in length shall be separately vented in an approved 
manner. The minimum area of any vent installed in 
a combination waste and vent system shall be at 
least one-half (1/2) the inside cross-sectional area 
of the drain pipe served. The vent connection shall 
be downstream of the uppermost fixture. 

91 0.4 Each waste pipe and each trap in any such 
system shall be at least two (2) pipe sizes larger than 
the sizes required by Chapter 7 of this code, and at 
least two (2) pipe sizes larger than any fixture 
tailpiece or connection. 

910.5 No vertical waste pipe shall be used in any 
such system, except the tailpiece or connection 
between the outlet of a plumbing fixture and the 
trap. Such tailpieces or connections shall be as short 
as possible, and in no case shall exceed two (2) feet 
(610 mm). 

Exception: Branch lines may have forty-five (45) 
degree (0.79 rad) vertical offsets. 

910.6 An accessible cleanout shall be installed in 
each vent for the combination waste and vent 
system. Cleanouts may not be required on any wet- 
vented branch serving a single trap when the fixture 
tailpiece or connection is not less than two (2) inches 
(50 mm) in diameter and provides ready access for 
cleaning through the trap. 

91 0.7 No water closet or urinal shall be installed on 
any such system. Other one (1), two (2), or three (3) 
unit fixtures remotely located from the sanitary 
system and adjacent to a combination waste and 
vent system may be connected to such system in the 
conventional manner by means of waste and vent 
pipes of regular sizes, providing that the two (2) pipe 
size increase required in Section 910.4 is based on the 
total fixture unit load connected to the system. 

Note: 

See Appendix B of this code for explanatory notes on 
the design of combination waste and vent systems. 



130 



CHAPTER 10 

TRAPS AND INTERCEPTORS 



1001.0 Traps Required. 

1001.1 Each plumbing fixture, excepting those 
having integral traps or as permitted in Section 
1001.2, shall be separately trapped by an approved 
type of waterseal trap. Not more than one (1) trap 
shall be permitted on a trap arm. 

1 001 .2 One (1) trap may serve a set of not more than 
three (3) single compartment sinks or laundry tubs of 
the same depth or three (3) lavatories immediately 
adjacent to each other and in the same room if the 
waste outlets are not more than thirty (30) inches 
(762 mm) apart and the trap is centrally located 
when three (3) compartments are installed. 

1 001 .3 No food waste disposal unit shall be installed 
with any set of restaurant, commercial, or industrial 
sinks served by a single trap; each such food waste 
disposal unit shall be cormected to a separate trap. 
Each domestic clothes washer and each laundry tub 
shall be connected to a separate and independent 
trap, except that a trap serving a laundry tub may 
also receive the waste from a clothes washer set 
adjacent thereto. No clothes washer or laundry tub 
shall be connected to any trap for a kitchen sink. 

1001.4 The vertical distance between a fixture outlet 
and the trap weir shall be as short as practicable, but 
in no case shall the tailpiece from any fixture exceed 
twenty-four (24) inches (610 mm) in length. 

1002.0 Traps Protected by Vent Pipes. 

1002.1 Each plumbing fixture trap, except as 
otherwise provided in this code, shall be protected 
against siphonage and back-pressure, and air 
circulation shall be assured throughout all parts of 
the drainage system by means of a vent pipe installed 
in accordance with the requirements of this code. 

1002.2 Each fixture trap shall have a protecting vent so 
located that the developed length of the trap arm from 
the trap weir to the irmer edge of the vent shall be 
within the distance given in Table 10-1, but in no case 
less than two (2) times the diameter of the trap arm. 

1002.3 A trap arm may change direction without the 
use of a cleanout when such change of direction does 
not exceed ninety (90) degrees (1.6 rad). All 
horizontal changes in direction of trap arms shall 
comply with Section 706.3. 

Exception; For trap arms three (3) inches (80 
mm) in diameter and larger, the change of 
direction shall not exceed one hundred and 



thirty-five (135) degrees (2.36 rad) without the 
use of a cleanout. 

1002.4 The vent pipe opening from a soil or waste 
pipe, except for water closets and similar fixtures, 
shall not be below the weir of the trap. 



TABLE 10-1 

Horizontal Distance of Trap Arms 

(Except for water closets and similar fixtures)* 



Trap Arm 
Inches 


Distance 

Trap to Vent 

Feet Inches 


Trap Arm 
mm 


Distance 

Trap to Vent 

mm 


1-1/4 


2 


6 


32 


762 


1-1/2 


3 


6 


40 


1067 


2 


5 





50 


1524 


3 


6 





80 


1829 


4 & larger 


10 





100 & larger 


3048 


Slope one-fourth (1/4) inch 


per foot (20.9 


mm/m) 



*The developed length between the trap) of a water closet or 
similar fixture (measured from the top of the closet ring [closet 
flange] to the inner edge of the vent) and its vent shall not 
exceed six (6) feet (1829 mm). 



1003.0 Traps — Described. 

1003.1 Each trap, except for traps within an 
interceptor or similar device, shall be self-cleaning. 
Traps for bathtubs, showers, lavatories, sinks, 
laundry tubs, floor drains, urinals, drinking 
fountains, dental units, and similar fixtures shall be 
of standard design and weight and shall be of ABS, 
cast brass, cast iron, lead, PP, PVC, or other 
approved material. An exposed and readily 
accessible drawn-brass tubing trap, not less than 17 
B&S Gauge (0.045 inch) (1.1 mm), may be used on 
fixtures discharging domestic sewage. 

Exception: Drawn-brass tubing traps shall not 
be used for urinals. Each trap shall have the 
manufacturer's name stamped legibly in the 
metal of the trap, and each tubing trap shall 
have the gauge of the tubing in addition to the 
manufacturer's name. Every trap shall have a 
smooth and uniform interior waterway. 

1 003.2 No more than one (1) approved slip joint 
fitting may be used on the outlet side of a trap, and 
no tubing trap shall be installed without a listed 
tubing trap adapter. Listed plastic trap adapters may 
be used to connect listed metal tubing traps. 



131 



1003.3-1011.0 



UNIFORM PLUMBING CODE 



1003.3 The size (nominal diameter) of a trap for a 
given fixture shall be sufficient to drain the fixture 
rapidly, but in no case less than nor more than one 
(1) pipe size larger than given in Table 7-3. The 
trap shall be the same size as the trap arm to which 
it is connected. 

1004.0 Traps — Prohibited. 

No form of trap that depends for its seal upon the action 
of movable parts shall be used. No trap that has 
concealed interior partitions, except those of plastic, 
glass, or similar corrosion-resisting material, shall be 
used. "S" traps, bell traps, and crown-vented traps shall 
be prohibited. No fixture shall be double trapped. Drum 
and bottle traps shall be installed only for special 
conditions. No trap shall be iQstalled without a vent, 
except as otherwise provided in this code. 

1005.0 Trap Seals. 

Each fixture trap shall have a water seal of not less 
than two (2) inches (51 mm) and not more than four 
(4) inches (102 mm), except where a deeper seal is 
found necessary by the Authority Having Jurisdiction. 
Traps shall be set true with respect to their water 
seals and, where necessary, they shall be protected 
from freezing. 

1006.0 Floor Drain Traps. 

Floor drains shall connect into a trap so constructed 
that it can be readily cleaned and of a size to serve 
efficiently the purpose for which it is intended. The 
drain inlet shall be so located that it is at all times in 
full view. When subject to reverse flow of sewage or 
liquid waste, such drains shall be equipped with an 
approved backwater valve. 

1007.0 Trap Seal Protection. 

Floor drain or similar traps directly connected to the 
drainage system and subject to infrequent use shall 
be protected with a trap seal primer, except where 
not deemed necessary for safety or sanitation by the 
Authority Having Jurisdiction. Trap seal primers 
shall be accessible for maintenance. 

1008.0 Building Traps. 

Building traps shall not be installed except where 
required by the Authority Having Jurisdiction. Each 
building trap when installed shall be provided with 
a cleanout and with a relieving vent or fresh-air 
intake on the inlet side of the trap, which need not be 
larger than one-half the diameter of the drain to 
which it connects. Such relieving vent or fresh-air 
intake shall be carried above grade and terminate in 
a screened outlet located outside the building. 



1009.0 Industrial Interceptors (Clarifiers) and 
Separators. 

1009.1 When Required. Interceptors (clarifiers) 
(including grease, oil, sand interceptors [clarifiers], 
etc.) shall be required by the Authority Having 
Jurisdiction when they are necessary for the proper 
handling of liquid wastes containing grease, 
flammable wastes, sand, solids, acid or alkaline 
substances, or other ingredients harmful to the 
building drainage system, the public or private 
sewer, or to public or private sewage disposal. 

1009.2 Approval. The size, type, and location of each 
interceptor (clarifier) or separator shall be approved 
by the Authority Having Jurisdiction. Except where 
otherwise specifically permitted, no wastes other 
than those requiring treatment or separation shall be 
discharged into any interceptor (clarifier). 

1009.3 Design. Interceptors (clarifiers) for sand and 
similar heavy solids shall be so designed and located 
as to be readily accessible for cleaning and shall have 
a water seal of not less than six (6) inches (152 mm). 

1009.4 Relief Vent. Interceptors (clarifiers) shall be 
so designed that they will not become air-bound if 
closed covers are used. Each interceptor (clarifier) 
shall be properly vented. 

1009.5 Location. Each interceptor (clarifier) cover 
shall be readily accessible for servicing and 
maintaining the interceptor (clarifier) in working and 
operating condition. The use of ladders or the 
removal of bulky equipment in order to service 
interceptors (clarifiers) shall constitute a violation of 
accessibility. Location of all interceptors (clarifiers) 
shall be shown on the approved building plan. 

1009.6 Maintenance of Interceptors. Interceptors 
shall be maintained in efficient operating condition 
by periodic removal of accumulated grease, scum, 
oil, or other floating substances and solids deposited 
in the interceptor. 

1 009.7 Discharge. The waste pipe from oil and sand 
interceptors shall discharge as approved by the 
Authority Having Jurisdiction. 

1010.0 Slaughterhouses, Packing Establishments, etc. 

Every fish, fowl, and animal slaughterhouse or 
establishment; every fish, fowl, and meat packing or 
curing establishment; every soap factory, tallow- 
rendering, fat-rendering, and hide-curing establish- 
ment shall be connected to and shall drain or 
discharge into an approved grease interceptor 
(clarifier). 

101 1 .0 Minimum Requirements for Auto Wash Racks. 

Every private or public wash rack and /or floor or 
slab used for cleaning machinery or machine parts 
shall be adequately protected against storm or surface 
water and shall drain or discharge into an approved | 
interceptor (clarifier). 



132 



TRAPS AND INTERCEPTORS 



1012.0-1014.2 



1012.0 Commercial and Industrial Laundries. 

Laundry eqviipment in con\n\ercial and industrial 
buildings that does not have integral strainers shall 
discharge into an interceptor having a wire basket or 
similar device that is removable for cleaning and that 
will prevent passage into the drainage system of 
solids one-half (1/2) inch (12.7 mm) or larger in 
maximum dimension, such as string, rags, buttons, 
or other solid materials detrimental to the public 
sewerage system. 

1013.0 Bottling Establishments. Bottling plants 
shall discharge their process wastes into an 
interceptor that will provide for the separation of 
broken glass or other solids, before discharging 
liquid wastes into the drainage system. 

1014.0 Grease Interceptors. 

1014.1 Where it is determined by-the Authority 
Having Jurisdiction that waste pretreatment is 
required, an approved type of grease interceptor(s) 
complying with the provisions of this section shall be 
correctly sized and properly installed in grease waste 
line(s) leading from sinks and drains, such as floor 
drains and floor sinks and other fixtures or 
equipment in serving establishn\ents such as 
restaurants, cafes, lunch counters, cafeterias, bars 
and clubs, hotels, hospitals, sanitariums, factory or 
school kitchens, or other establishments where 
grease may be introduced into the drainage or 
sewage system in quantities that can effect line 
stoppage or hinder sewage treatment or private 
sewage disposal. A grease interceptor shall not be 
required for individual dwelling units or for any 
private living quarters. Water closets, urinals, and 
other plumbing fixtures conveying human waste 
shall not drain into or through the grease interceptor. 

1014.1.1 Each fixture discharging into a grease 
interceptor shall be individually trapped and 
vented in an approved manner. 

1014.1.2 All grease interceptors shall be 
maintained in efficient operating condition by 
periodic removal of the accumulated grease and 
latent material. No such collected grease shall be 
introduced into any drainage piping or public or 
private sewer. If the Authority Having Jurisdic- 
tion determines that a grease interceptor is not 
being properly cleaned or maintained, the 
Authority Having Jurisdiction shall have the 
authority to mandate the installation of addi- 
tional equipment or devices and to mandate a 
maintenance program. 

1014.1.3 Food Waste Disposal Units and 
Dishwashers. Unless specifically required or 
permitted by the Authority Having Jurisdiction, 
no food waste disposal unit or dishwasher shall 



be connected to or discharge into any grease 
interceptor. Commercial food waste disposers 
shall be permitted to discharge directly into the 
building's drainage system. 

1014.2 Hydromechanical Grease Interceptors. 

1014.2.1 Each plumbing fixture or piece of 
equipment connected to a hydromechanical grease 
interceptor shall be provided with an approved 
type of vented flow control installed in a readily 
accessible and visible location. How control devices 
shall be designed and installed so that the total flow 
through such device or devices shall at no time be 
greater than the rated flow of the grease interceptor. 
No flow-control device having adjustable or 
removable parts shall be approved. The vented 
flow-control device shall be located such that no 
system vent shall be between the flow-control and 
the grease trap inlet. The vent or air inlet of the 
flow-control device shaU connect with the sanitary 
drainage vent system, as elsewhere required by this 
code, or shall terminate through the roof of the 
building, and shall not terminate to the free 
atmosphere inside the building. 

Exception: Listed grease interceptors with 
integral flow controls or restricting devices 
shall be installed in an accessible location in 
accordance with the manufacturers' 
instructions. 

1014.2.2 The total capacity in gallons (L) of 
fixtures discharging into any hydromechanical 
grease interceptor shall not exceed two and one- 
half (2-1/2) times the certified GPM (L/s) flow 
rate of the interceptor as per Table 10-2. 

For the purpose of this section, the term 
"fixture" shall mean and include each plumbing 
fixture, appliance, apparatus, or other equipment 
required to be connected to or discharged into a 
grease interceptor by any provision of this 
section. 

1 01 4.2.3 A vent shall be installed downstream 
of hydromechanical grease interceptors in 
accordance with the requirements of this code. 



133 



Table 10-2 -1015.1 



UNIFORM PLUMBING CODE 



Table 10-2 
Hydromechanical Grease Interceptor (HGI) 

Sizing Chart* 
DFU HGI FLOW (gpm) 



10 

13 

20 

35 

172 

216 

342 

428 

576 

720 



20 

25 

35 

50 

75 

100 

150 

200 

250 

350 

500 



*Based on intermittent potentially full flow in 
drainage lines. 

1014.3 Gravity Grease Interceptors. Required 
gravity grease interceptors shall comply with the 
provisions of Sections 1014.3.1 through 1014.3.7. 

1014.3.1 General. 

The provisions of this section shall apply to the 
design, construction, installation, and testing of 
commercial kitchen gravity grease interceptors. 

1014.3.2 Waste Discharge Requirements. 

1014.3.2.1 Waste discharge in establishments 
from fixtures and equipment which may 
contain grease, including but not limited to, 
scullery sinks, pot and pan sinks, dishwashers, 
soup kettles, and floor drains located in areas 
where grease-containing materials may exist, 
may be drained into the sanitary waste 
through the interceptor when approved by the 
Authority Having Jurisdiction. 

1014.3.2.2 Toilets, urinals, and other 
similar fixtures shall not drain through the 
interceptor. 

1014.3.2.3 All waste shall enter the 
interceptor through the inlet pipe only. 

1014.3.3 Design. 

1014.3.3.1 Gravity Interceptors shall be 
constructed in accordance with the applicable 
standard in Table 14-1 or the design approved 
by the Authority Having Jurisdiction. 

1014.3.4 Location. 

1014.3.4.1 Each grease interceptor shall be 
so installed and connected that it shall be 
at all times easily accessible for inspection. 



cleaning, and removal of the intercepted 
grease. A gravity grease interceptor 
complying with lAPMO PS 80, shall not be 
installed in any part of a building where 
food is handled. Location of the grease 
interceptor shall meet the approval of the 
Authority Having Jurisdiction. 

1014.3.4.2 Interceptors shall be placed as 
close as practical to the fixtures they serve. 

1 01 4.3.4.3 Each business establishment for 
which a gravity grease interceptor is 
required shall have an interceptor which 
shall serve only that establishment unless 
otherwise approved by the Authority 
Having Jurisdiction. 

1014.3.4.4 Each gravity grease interceptor 
shall be located so as to be readily accessible 
to the equipment required for maintenance. 

1014.3.5 Construction Requirements. 

1014.3.5.1 Purpose. Gravity grease 
interceptors shall be designed to remove 
grease from effluent and shall be sized in 
accordance with this section. Gravity grease 
interceptors shall also be designed to retain 
grease until accumulations can be renioved by 
pumping the interceptor. It is recommended 
that a sample box be located at the outlet end 
of all gravity grease interceptors so that the 
Authority Having Jurisdiction can periodi- 
cally sample effluent quedity. 

1014.3.6 Sizing Criteria. 

1014.3.6.1 Sizing. The volume of the 
interceptor shall be determined by using 
Table 10-3. If drainage fixture units (DFUs) 
are not known, the interceptor shall be sized 
based on the maximum DFUs allowed for the 
pipe size connected to the inlet of the 
interceptor. Refer to Table 7-5, Drainage 
Piping, Horizontal. 

1014.3.7 Abandoned Gravity Grease Intercep- 
tors. Abandoned grease interceptors shall be 
pumped and filled as required for abandoned 
sewers and sewage disposal facilities in Section 
722.0. 

1015.0 FOG (Fats, Oils, and Greases) Disposal 
System. 

1015.1 Purpose. 

The purpose of this section is to provide the necessary 
criteria for the sizing, application, and installation of 
FOG disposal systems designated as a pretreatment or 
discharge water quality compliance strategy. 



134 



TRAPS AND INTERCEPTORS 



Table 10-3 -1016.2 



Table 10-3 
Gravity Grease Interceptor Sizing 



DFUs (1) 

8 

21 (3) 

35 

90 (3) 

172 

216 

307 (3) 

342 

428 

576 

720 

2112 

2640 



Interceptor Volume (2) 

500 gallons 
750 gallons 
1,000 gallons 
1,250 gallons 
1,500 gallons 
2,000 gallons ■ 
2,500 gallons 
3,000 gallons 
4,000 gallons 
5,000 gallons 
7,500 gallons 
10,000 gallons 
15,000 gallons 



Notes 

(1) Tlie maximum allowable DFUs plumbed to the kitchen drain lines that will be connected to the grease interceptor. 

(2) This size is based on: the DFUs, the pipe size from this code; Table 7-5; Useful Tables for flow in half-full pipes (ref : Mohinder Nayynr Piping 
Handbook, 3Td Edition, 1992). 

(3) Based on 30-minute retention time (ref.: Metcalf & Eddy, hic. Small and Decentralized Wastezuater Management Systems, 3rd Ed. 1998). Romided up 
to nominal interceptor volume. 



1015.2 Scope. 

FOG disposal systems shall be considered engineered 
systems and shall comply with the requirements of 
section 301.2 of this code. 

1015.3 Components, Materials, and Equipment. 

FOG disposal systems, including all components, 
materials, and equipment necessary for the proper 
function of the system, shall comply with sections 
301.1.3 or 301.2 of this code. 

1015.4 Sizing Application and Installation. 

FOG disposal systems shall be engineered, sized, 
and installed in accordance with the manufacturers' 
specifications and as specified in lAPMO PS 118- 
2000, as listed in Chapter 14, Table 14-1 of this code. 

1015.5 Performance. 

FOG disposal systems shall be tested and certified as 
described in lAFMO PS 118-2000, as listed in 
Chapter 14, Table 14-1 of this code, and other 
national consensus standards applicable to FOG 
disposal systems as discharging no more than 
lOOmg/L FOG. 

Gravity Grease Interceptor Sizing Example: 

Given: A restaurant with the following fixtures and 
equipment. 

one food preparation sink; three floor drains - one in the food 
prep area, one in the grill area, and one receiving the indirect 
waste from the ice machine; a mop sink; a dishwasher with a 
maximum discharge flow rate of 20 gpm discharging into a 
dedicated receptor; and two public restrooms, each with one 
water closet and one lavatory. 



Kitchen Drain Line DFU Count (from Table 7-3): 

3 floor drains @ 2 DFUs each = 6 DFUs 

Mop sink @ 3 DFUs each = 3 DFUs 

Food prep sink @ 3 DFUs each = 3 DFUs 

Dishwasher @ 4 DFUs (Table 7-4) = 4 DFUs 

Total 16 DFUs 

Using Table 10-3, the grease interceptor will be sized at 750 
gallons. 

1016.0 Sand Interceptors. 

1016.1 Where Required. 

1016.1.1 Whenever the discharge of a fixture or 
drain may contain solids or semi-solids heavier 
than water that would be harmful to a drainage 
system or cause a stoppage within the system, 
the discharge shall be through a sand interceptor. 
Multiple floor drains may discharge into one 
sand interceptor. 

1016.1.2 Sand interceptors are required when- 
ever the Authority Having Jurisdiction deems it 
advisable to have a sand interceptor to protect 
the drainage system. 

1016.2 Construction and Size. 

Sand interceptors shall be built of brick or concrete, 
prefabricated coated steel, or other watertight material. 
The interceptor shall have an interior baffle for full 
separation of the interceptor into two (2) sections. The 
outlet pipe shall be the same size as the inlet pipe of the 
sand interceptor, the minimum being three (3) inches 



135 



1016.2-1017.2 



UNIFORM PLUMBING CODE 



(80 mm), and the baffle shall have two (2) openings of 
the same diameter as the outlet pipe and at the same 
invert as the outlet pipe. These openings shall be 
staggered so that there cannot be a straight line flow 
between any inlet pipe and the outlet pipe. The invert 
of the inlet pipe shall be no lower than the invert of the 
outlet pipe. 

The sand interceptor shall have a minimum 
dimension of two (2) feet square (0.2 m^) for the net free 
opening of the inlet section and a minimum depth under 
the invert of the outlet pipe of two (2) feet (610 mm). 

For each five (5) gallons (18.9 L) per minute flow 
or fraction thereof over twenty (20) gallons (75.7 L) 
per minute, the area of the sand interceptor inlet 
section is to be increased by one (1) square foot (0.09 
m^). The outlet section shall at all times have a 
minimum area of fifty (50) percent of the inlet section. 

The outlet section shall be covered by a solid 
removable cover, set flush with the finished floor, 
and the inlet section shall have an open grating, set 
flush with the finished floor and suitable for the 
traffic in the area in which it is located. 

1016.3 Separate Use. Sand and similar interceptors for 
every solid shall be so designed and located as to be 
readily accessible for cleaning, shall have a water seal of 
not less than six (6) inches (152 mm), and shall be vented. 

1017.0 Oil and Flammable Liquid Interceptors. 

1017.1 Interceptors Required. All repair garages 
and gasoline stations with grease racks or grease 
pits, and all factories that have oily, flammable, or 
both types of wastes as a result of manufacturing, 
storage, maintenance, repair, or testing processes, 
shall be provided with an oil or flammable liquid 
interceptor that shall be connected to all necessary 
floor drains. The separation or vapor compartment 
shall be independently vented to the outer air. If two 
(2) or more separation or vapor compartments are 
used, each shall be vented to the outer air or may 
connect to a header that is installed at a minimum of six 
(6) inches (152 mm) above the spill Mne of the lowest 
floor drain and vented independently to the outer air. 
The minimum size of a flammable vapor vent shall not 
be less than two (2) inches (50 mm), and, when vented 
through a sidewall, the vent shall not be less than ten 
(10) feet (3048 mm) above the adjacent level at an 
approved location. The interceptor shaU be vented on 
the sewer side and shall not connect to a flammable 
vapor vent. All oil and flammable interceptors shaU be 
provided with gastight cleanout covers that shall be 
readily accessible. The waste line shall not be less than 
three (3) inches (80 mm) in diameter with a full-size 
cleanout to grade. When an interceptor is provided 
witli an overflow, it shall be provided with an overflow 
Mne (not less than two (2) inches (50 mm) in diameter) 
to an approved waste oil tank having a minimum 



capacity of five hundred fifty (550) gallons (2,080 L) and 
meeting the requirements of the Authority Having 
Jurisdiction. The waste oil from the separator shall flow 
by gravity or shall be pumped to a higher elevation by 
an automatic pump. Pumps shall be adequately sized 
and accessible. Waste oil tanlcs shall have a two (2) inch 
(50 mm) minimum pump-out connection at grade and 
a one and one-half (1-1/2) inch (40 mm) minimum vent 
to atmosphere at an approved location at least ten (10) 
feet (3,048 mm) above grade. 

1017.2 Design of Interceptors. Each manufactured 
interceptor that is rated shall be stamped or labeled 
by the manufacturer with an indication of its full 
discharge rate in gpm (L/s). The full discharge rate to 
such an interceptor shall be determined at full flow. 
Each interceptor shall be rated equal to or greater 
than the incoming flow and shall be provided with an 
overflow line to an underground tank. 

Interceptors not rated by the manufacturer shall 
have a depth of not less than two (2) feet (610 mm) 
below the invert of the discharge drain. The outlet 
opening shall have not less than an eighteen (18) inch 
(457 mm) water seal and shall have a minimum capacity 
as follows: where not more than thi'ee (3) motor vehicles 
are serviced and /or stored, interceptors shall have a 
minimum capacity of six (6) cubic feet (0.2 nf), and one 
(1) cubic foot (0.03 m^) of capacity shall be added for 
each vehicle up to ten (10) vehicles. Above ten (10) 
vehicles, the Authority Having Jurisdiction shall 
determine tiie size of the interceptor required. Where 
vehicles are serviced only and not stored, interceptor 
capacity shall be based on a net capacity of one (1) cubic 
foot (0.03 m^) for each one hundred (100) square feet (9.3 
m^) of surface to be drained into the interceptor, with a 
minimum of six (6) cubic feet (0.2 m^). 



136 



CHAPTER 11 

STORM DRAINAGE 



1101.0 General. 

1101.1 Where Required. All roofs, paved areas, 
yards, courts, and courtyards shall be drained into a 
separate storm sewer system, or into a combined 
sewer system where a separate storm sewer system 
is not available, or to some other place of disposal 
satisfactory to the Authority Having Jurisdiction, hi 
the case of one- and two-family dwellings, storm 
water may be discharged on flat areas such as streets 
or lawns so long as the storm water shall flow away 
from the building and away from adjoining 
property, and shall not create a nuisance. 

1101.2 Storm Water Drainage to Sanitary Sewer 
Prohibited. Storm water shall not be drained into 
sewers intended for sanitary drainage only. 

1101.3 Material Uses. Rainwater piping placed 
within the interior of a building or run within a vent 
or shaft shall be of cast iron, galvanized steel, 
wrought iron, brass, copper, lead. Schedule 40 ABS 
DWV, Schedule 40 PVC DWV, stainless steel 304 or 
316L (stainless steel 304 pipe and fittings shall not be 
installed underground and shall be kept at least six 
inches (152 mm) aboveground), or other approved 
materials, and changes in direction shall conform to 
the requirements of Section 706.0. ABS and PVC 
DWV piping installations shall be installed in 
accordance with IS 5, IS 9, and Chapter 15 "Firestop 
Protection." Except for individual single-family 
dwelling units, materials exposed within ducts or 
plenums shall have a flame-spread index of not more 
than 25 and a smoke-developed index of not more 
than 50, when tested in accordance with the Test for 
Surface-Burning Characteristics of the Building 
Materials (see the Building Code standards based on 
ASTM E-84 and ANSI/UL 723.). 

1101.4 Expansion Joints Required. Expansion 
joints or sleeves shall be provided where warranted 
by temperature variations or physical conditions. 

1101.5 Subsoil Drains. 

1101 .5.1 Subsoil drains shall be provided around 
the perimeter of buildings having basements, 
cellars, or crawl spaces or floors below grade. 
Such subsoil drains may be positioned inside or 
outside of the footing, shall be of perforated or 
open-jointed approved drain tile or pipe not less 
than three (3) inches (80 mm) in diameter, and 
shall be laid in gravel, slag, crushed rock, 
approved three-quarter (3/4) inch (19.1 mm) 
crushed recycled glass aggregate, or other 



approved porous material with a minimum of 
four (4) inches (102 mm) surrounding the pipe 
on all sides. Filter media shall be provided for 
exterior subsoil piping. 

1 1 01 .5.2 Subsoil drains shall be piped to a storm 
drain, to an approved water course, to the front 
street curb or gutter, or to an alley, or the 
discharge from the subsoil drains shall be 
conveyed to the alley by a concrete gutter. Where 
a continuously flowing spring or groundwater is 
encountered, subsoil drains shall be piped to a 
storm drain or an approved water course. 

1101 .5.3 Where it is not possible to convey the 
drainage by gravity, subsoil drains shall 
discharge to an accessible sump provided with 
an approved automatic electric pump. The sump 
shall be at least fifteen (15) inches (375 mm) in 
diameter, eighteen (18) inches (457 mm) in 
depth, and provided with a fitted cover. The 
sump pump shall have an adequate capacity to 
discharge all water coming into the sump as it 
accumulates to the required discharge point, and 
the capacity of the pump shall not be less than 
fifteen (15) gpm (1.0 L/s). The discharge piping 
from the sump pump shall be a minimum of one 
and one-half (1-1/2) inches (40 mm) in diameter 
and have a union or other approved quick- 
disconnect assembly to make the pump 
accessible for servicing. 

1101.5.4 For separate dwellings not serving 
continuously flowing springs or groundwater, 
the sump discharge pipe may discharge onto a 
concrete splash block with a minimum length of 
twenty-four (24) inches (610 mm). This pipe shall 
be within four (4) inches (102 mm) of the splash 
block and positioned to direct the flow parallel 
to the recessed line of the splash block. 

1101.5.5 Subsoil drains subject to backflow 
when discharging into a storm drain shall be 
provided with a backwater valve in the drain 
line so located as to be accessible for inspection 
and maintenance. 

1101.5.6 Nothing in Section 1101.5 shall prevent 
drains that serve either subsoil drains or areaways 
of a detached building from discharging to a 
properly graded open area, provided that: 

(1) They do not serve continuously flowing 
springs or groundwater; 

(2) The point of discharge is at least ten (10) feet 
(3,048 mm) from any property line; and • 



137 



1101.5-1101.12 



UNIFORM PLUMBING CODE 



(3) It is impracticable to discharge such drains 
to a storm, drain, to an approved water 
course, to the front street curb or gutter, or 
to an alley. 

1101.6 Building Subdrains. Building subdrains 
located below the public sewer level shall discharge 
into a sump or receiving tank, the contents of which 
shall be automatically lifted and discharged into the 
drainage system as required for building sumps. 

1101.7 Areaway Drains. All open subsurface space 
adjacent to a building, serving as an entrance to the 
basement or cellar of a building, shall be provided 
with a drain or drains. Such areaway drains shall be 
two (2) inches (50 mm) minimum diameter for 
areaways not exceeding one hundred (100) square 
feet (9.3 m^) in area, and shall be discharged in the 
manner provided for subsoil drains not serving 
continuously flowing springs or groundwater (see 
Section 1101.5.2). Areaways in excess of one hundred 
(100) square feet (9.3 m^) shall not drain into subsoil. 
Areaway drains for areaways exceeding one 
hundred (100) square feet (9.3 m^) shall be sized 
according to Table 11-2. 

1101.8 Window Areaway Drains. Window areaways 
not exceeding ten (10) square feet (0.9 m^) in area 
may discharge to the subsoil drains through a two 
(2) inch (50 mm) pipe. However, window areaways 
exceeding ten (10) square feet (0.9 m^) in area shall be 
handled in the manner provided for entrance 
areaways (see Section 1101.7). 

1101.9 Filling Stations and IVIotor Vehicle Washing 
Establishments. Public filling stations and motor 
vehicle washing establishments shall have the paved 
area sloped toward sumps or gratings within the 
property lines. Curbs not less than six (6) inches (152 
mm) high shall be placed where required to direct 
water to gratings or sumps. 

1101.10 Paved Areas. Where the occupant creates 
surface water drainage, the sumps, gratings, or floor 
drains shall be piped to a storm drain or an 
approved water course. 

1 1 01 .1 1 Roof Drainage. 

1101.11.1 Primary Roof Drainage. Roof areas 
of a building shall be drained by roof drains or 
gutters. The location and sizing of drains and 
gutters shall be coordinated with the structural 
design and pitch of the roof. Unless otherwise 
required by the Authority Having Jurisdiction, 
roof drains, gutters, vertical conductors or 
leaders, and horizontal storm drains for primary 
drainage shall be sized based on a storm of sixty 
(60) minutes duration and 100-year return 
period. Refer to Table D-1 (in Appendix D) for 
100-year, 60-minute storms at various locations. 



1101.11.2 Secondary drainage. Secondary 
(emergency) roof drainage shall be provided by 
one of the methods specified in Section 
1101.11.2.1 or 1101.11.2.2. 

1101.11.2.1 Roof Scuppers or Open Side. 

Secondary roof drainage shall be provided by 
an open-sided roof or scuppers where the 
roof perimeter construction extends above 
the roof in such a manner that water will be 
entrapped. An open-sided roof or scuppers 
shall be sized to prevent the depth of ponding 
water from exceeding that for which the roof 
was designed as determined by Section 
1101.11.1. Scupper openings shall be a 
minimum of 4" high and have a width equal 
to the circumference of the roof drain required 
for the area served, sized by Table 11-1. 

1101.11.2.2 Secondary Roof Drain. 

Secondary roof drains shall be provided. 
The secondary roof drains shall be located a 
minimum of 2 inches above the roof surface. 
The maximum height of the roof drains shall 
be a height to prevent the depth of ponding 
water from exceeding that for which the 
roof was designed as determined by Section 
1101.11.1. The secondary roof drains shall 
connect to a piping system conforming to 
Section 1101.11.2.2.1 or 1101.11.2.2.2. 

1101.11.2.2.1 Separate Piping System. 

The secondary roof drainage system 
shall be a separate system of piping, 
independent of the primary roof 
drainage system. The discharge shall be 
above grade, in a location observable by 
the building occupants or maintenance 
personnel. Secondary roof drain systems 
shall be sized in accordance with Section 
1101.11.1 based on the rainfall rate for 
which the primary system is sized. 

1101.11.2.2.2 Combined System. The 

secondary roof drains shall connect to the 
vertical piping of the primary storm 
drainage conductor downstream of any 
horizontal offset below the roof. The 
primary storm drainage system shall 
connect to the building storm water that 
connects to an underground public storm 
sewer. The combined secondary and prim- 
ary roof drain systems shall be sized in 
accordance with Section 1106.0 based on 
double the rainfall rate for the local area. 

1101.12 Cleanouts. 

1101.12.1 Cleanouts for building storm 
drains shall comply with the requirements 
of Section 719.0 of this code. 



138 



STORM DRAINAGE 



1101.12-1105.1 



1101.12.2 Rain leaders and conductors 
connected to a building storm sewer shall 
have a cleanout installed at the base of the 
outside leader or outside conductor before it 
connects to the horizontal drain. 

1101.13 All rainwater sumps serving "public 
use" occupancy buildings shall be provided with 
dual pumps arranged to function alternately in 
case of overload or mechanical failure. 

1102.0 Materials. 

1102.1 Conductors. 

1102.1.1 Conductors installed aboveground in 
buildings shall be constructed of materials 
specified in Table 14-1. 

1 1 02.1 .2 The inside of conductors installed above 
ground level shall be of seamless copper water 
tube. Type K, L, or M; Schedule 40 copper pipe or 
Schedule 40 copper alloy pipe; Type DWV copper 
drainage tube; service weight cast-iron soil pipe or 
hubless cast-iron soil pipe; standard weight 
galvanized steel pipe; stainless steel 304 or 316L 
(stainless steel 304 pipe and fittings shall not be 
installed underground and shall be kept at least 6 
inches (152 mm) aboveground); or Schedule 40 
ABS or Schedule 40 PVC plastic pipe. 

1102.2 Leaders. 

1102.2.1 Leaders shall be constructed of 
materials specified in Table 14-1. 

1102.2.2 Leaders shall be of seamless copper 
water tube. Type K, L, or M; Schedule 40 copper 
pipe; Schedule 40 copper alloy pipe; type DWV 
copper drainage tube; service weight cast-iron soil 
pipe or hubless cast-iron soil pipe; aluminum 
sheet nietal, galvanized steel sheet metal, or 
copper sheet metal; standard weight galvanized 
steel pipe; Class DL or XL lead pipe; stainless steel 
304 or 316L (stainless steel 304 pipe and fittings 
shall not be installed underground and shall be 
kept at least 6 inches (152 nun) above-ground); or 
Schedule 40 ABS or Schedule 40 PVC plastic pipe. 

1102.3 Underground Building Storm Drains. All 

underground building storm drains shall be 
constructed of materials specified in Table 14-1. 

1102.4 Building Storm Sewers. Building storm sewers 
shall be constructed of materials specified in Table 14-1. 

1102.5 Subsoil Drains. 

1102.5.1 Subsoil drains shall be constructed of 
materials specified in Table 14-1. 



1 1 02.5.2 Subsoil drains shall be open-jointed or 
of perforated pipe, vitrified clay, plastic, cast 
iron, or porous concrete. 

1103.0 Traps on Storm Drains and Leaders. 

1103.1 Where Required. Leaders and storm drains, 
when connected to a combined sewer, shall be 
trapped. Floor and area drains connected to a storm 
drain shall be trapped. 

Exception: Traps shall not be required where 
roof drains, rain leaders, and other inlets are at 
locations allowed under Section 906.0, Vent 
Termination. 

1103.2 Where Not Required. No trap shall be 
required for leaders or conductors 1jiat are connected 
to a sewer carrying storm water exclusively. 

1103.3 Trap Size. Traps, when installed for 
individual conductors, shall be the same size as the 
horizontal drain to which they are cormected. 

1103.4 Method of Installation of Combined Sewer. 

Individual storm-water traps shall be installed on the 
storm-water drain branch serving each storm-water 
inlet, or a single trap shall be installed in the main 
storm drain just before its connection with the 
combined building sewer. Such traps shall be 
provided with an accessible cleanout on the outlet 
side of the trap. 

1104.0 Leaders, Conductors, and Connections. 

1104.1 Improper Use. Leaders or conductors shall 
not be used as soil, waste, or vent pipes nor shall 
soil, waste, or vent pipes be used as leaders or 
conductors. 

1104.2 Protection of Leaders. Leaders installed 
along alle5rways, driveways, or other locations where 
they may be exposed to damage shall be protected 
by metal guards, recessed into the wall, or 
constructed from ferrous pipe. 

1104.3 Combining Storm with Sanitary Drainage. 

The sanitary and storm drainage system of a 
building shall be entirely separate, except where a 
combined sewer is used, in which case the building 
storm drain shall be connected in the same 
horizontal plane through single wye fittings to the 
combined building sewer at least ten (10) feet (3,048 
mm) downstream from any soil stack. 

1105.0 Roof Drains. 

1t05.1 Material. 

1105.1.1 Roof drains shall be constructed of 
materials specified in Table 14-1. 



139 



1105.1 -1108.1 



UNIFORM PLUMBING CODE 



1 1 05.1 .2 Roof drains shall be of cast iron, copper 
or copper alloy, lead, or plastic. 

1105.2 Dome or Strainer for General Use. All roof 
drains and overflow drains, except those draining to 
hanging gutters, shall be equipped with strainers 
extending not less than four (4) inches (102 mm) 
above the surface of the roof immediately adjacent to 
the drain. Strainers shall have a minimum inlet area 
above the roof level of not less than one and one-half 
(1-1/2) times the area of the conductor or leader to 
which the drain is connected. 

1105.3 Strainers for Flat Decks. Roof drain strainers 
for use on sun decks, parking decks, and similar areas 
tliat are normally serviced and maintained may be of 
the flat surface type. Such roof drain strainers shall be 
level with the deck and shall have an available inlet 
area of no less than two (2) tinies the area of the 
conductor or leader to which the drain is connected. 

1105.4 Roof Drain Flashings. Connection between 
the roof and roof drains that pass through the roof 
and into the interior of the building shall be made 
watertight by the use of proper flashing material. 

1105.4.1 Where lead flashing material is used, it 
shall be a minimum of four (4) pounds per 
square foot (19.5 kg/m^). 

1105.4.2 Where copper flashing material is 
used, it shall be a minimum of twelve (12) 
ounces per square foot (3.7 kg/m^). 

1106.0 Size of Leaders, Conductors, and Storm 
Drains. 

1106.1 Vertical Conductors and Leaders. Vertical 
conductors and leaders shall be sized on the basis of 
the maximum projected roof area and Table 11-1. 

1106.2 Size of Horizontal Storm Drains and 
Sewers. The size of building storm drains or building 
storm sewers or any of their horizontal branches shall 
be based upon the maximum projected roof or paved 
area to be handled and Table 11-2. 

1106.3 Size of Roof Gutters. The size of semi- 
circular gutters shall be based on the maximum 
projected roof area and Table 11-3. 

1106.4 Side Walls Draining onto a Roof. Where 
vertical walls project above a roof so as to permit 
storm water to drain to the roof area below, the 
adjacent roof area may be computed from Table 11-1 
as follows: 

(1) For one (1) wall - add fifty (50) percent of 
the wall area to the roof area figures. 

(2) For two (2) adjacent walls - add thirty-five 
(35) percent of the total wall areas. 

(3) Two (2) opposite walls of same height - add 
no additional area. 



(4) Two (2) opposite walls of differing heights- 
add fifty (50) percent of the wall area above 
the top of lower wall. 

(5) Walls on three (3) sides - add fifty (50) 
percent of the area of the inner wall below 
the top of the lowest wall, plus allowance 
for the area of the wall above the top of the 
lowest wall, per (2) and (4) above. 

(6) Walls on four (4) sides - no allowance for 
wall areas below the top of the lowest wall - 
add for areas above the top of the lowest 
wall per (1), (2), (4), and (5) above. 

1107.0 Values for Continuous Flow. 

Where there is a continuous or semi-continuous 
discharge into the building storm drain or building 
storm sewer, as from a pump, ejector, air- 
conditioning plant, or similar device, one (1) gpm 
(3.8 L/min.) of such discharge shall be computed as 
being equivalent to twenty-four (24) square feet (2.2 
m^) of roof area, based upon a rate of rainfall of four 
(4) inches (102 mm) per hour. 

1108.0 Controlled-Flow Roof Drainage. 

1108.1 Application. In lieu of sizing the storm 
drainage system in accordance with Section 1106.0, 
the roof drainage may be sized on the basis of 
controlled flow and storage of the storm water on the 
roof, provided the following conditions are met: 

(1) The water from a 25-year-frequency storm 
shall not be stored on the roof for more than 
twenty-four (24) hours. 

(2) During the storm, the water depth on the 
roof shall not exceed the depths specified in 
Table 11-4. 

TABLE 11-4 
Controlled-Flow Maximum Roof Water Depth 



Roof Rise,* 


Max Water Depth at Drain, 


Inches (mm) 


Inches 


(mm) 


Flat (Flat) 


3 


(76) 


2 (51) 


4 


(102) 


4 (102) 


5 


(127) 


6 (152) 


6 


(152) 



*Vertical measurement from the roof surface at the drain to the highest 
point of the roof surface served by the drain, ignoring any local 
depression immediately adjacent to the drain. 

(3) No less than two (2) drains shall be installed 
in roof areas of ten thousand (10,000) square 
feet (929.0 m^) or less, and no less than one 
(1) additional drain shall be installed for 



140 



STORM DRAINAGE 



1108.1 -1109.2 



each ten thousand (10,000) square feet (929.0 
m^) of roof area over ten thousand (10,000) 
square feet (929.0 m^). 

(4) Each roof drain shall have a precalibrated, 
fixed (nonadjustable), and proportional 
weir (notched) in a standing water 
collar inside the strainer. No mechanical 
devices or valves shall be allowed. 

(5) Pipe sizing shall be based on the pre- 
calibrated rate of flow (gpm) of the pre- 
calibrated weir for the maximum allowable 
water depth, and Tables 11-1 and 11-2. 

(6) The height of stones or other granular 
material above the waterproofed surface 
shall not be considered in water depth 
measurement, and the roof surface in the 
vicinity of the drain shall not be recessed to 
create a reservoir. 

(7) Roof design, where controlled-flow roof 
drainage is used, shall be such that the 
minimum design roof live load is thirty (30) 
pounds per square foot (146.5kg/m^) to 
provide a safety factor above the fifteen (15) 
pounds per square foot (73.2kg/m^) 
represented by the depth of water stored on 
the roof as indicated in Table 11-4. 

(8) Scuppers shall be provided in parapet walls. 
The distance of scupper bottoms above the 
roof level at the drains shall not exceed the 
maximum distances specified in Table 11-5. 

TABLE 11-5 
Distance of Scupper Bottoms Above Roof 





Maximum Distance of 




Scupper Bottom 


Roof Rise,* 


Above Roof Level at Drains, 


Inches (mm) 


Inches (mm) 


Flat (Flat) 


3 (76.2) . 


2 (51) 


4 (102.0) 


4 (102) 


5 (127.0) 


6 (152) 


6 (152.0) 



*Vertical measurement from the roof surface at the drain to the highest 
point of the roof surface served by the drain, ignoring any local 
depression immediately adjacent to the drain. 

(9) Scupper openings shall be a minimum of 4 
inches high and have a width equal to the 
circumference of the roof drain required for 
the area served, sized by Table 11-1. 

(10) Flashings shall extend above the top of the 
scuppers. 

(11) At any wall or parapet, forty-five (45) 
degree (0.79 rad) cants shall be installed. 



(12) Separate storm and sanitary drainage 
systems shall be provided within the 
building. 

(13) Calculations for the roof drainage system 
shall be submitted along with the plans to 
the Authority Having Jurisdiction for 
approval. 

1108.2 Setback Roofs. Drains on setback roofs may 
be connected to the controlled-flow drainage systems 
provided: 

(1) The setback is designed for storing water, or 

(2) The square footage of the setback drainage 
area is converted as outlined in Section 
1108.0 to gpm, and the storm-water pipe 
sizes in the controlled-flow system are 
based on the sum of the loads. 

(3) The branch from each of the roof drains that 
are not provided with controlled flow shall 
be sized in accordance with Table 11-1. 



1109.0 Testing. 

1109.1 Testing Required. New building storm 
drainage systems and parts of existing systems that 
have been altered, extended, or repaired shall be 
tested as described in Section 1109.2.1 to disclose 
leaks and defects. 

1109.2 Methods of Testing Storm Drainage 
Systems. Except for outside leaders and perforated 
or open-jointed drain tile, the piping of storm drain 
systems shall be tested upon completion of the rough 
piping installation by water or air, and proved tight. 
The Authority Having Jurisdiction may require the 
removal of any cleanout plugs to ascertain whether 
the pressure has reached all parts of the system. 
Either of the following test methods shall be used: 

1109.2.1 Water Test, After piping has been 
installed, the w^ater test shall be applied to the 
drainage system, either to the entire system or to 
sections. If the test is applied to the entire system, 
all openings in the piping shall be tightly closed 
except for the highest opening, and the system 
shall be filled with water to the point of 
overflow. If the system is tested in sections, each 
opening shall be tightly plugged except for the 
highest opening of the section under test, and 
each section shall be filled with water, but no 
section shall be tested with less than a ten (10) 
foot (3,048 mm) head of water. In testing 
successive sections, at least the upper ten (10) feet 
(3,048 mm) of the next preceding section shaU be 
tested so that no joint of pipe in the building 
(except the uppermost ten (10) foot (3,048 mm) of 
a roof drainage system, which shall be filled with 



141 



1109.2 



UNIFORM PLUMBING CODE 



water to the flood level of the uppermost roof 
drain) shall have been submitted to a test of less 
than a ten (10) foot (3048 mm) head of water. The 
water shall be kept in the system or in the 
portion under test for at least fifteen (15) minutes 
before inspection starts; the system shall then be 
tight at all points. 

1109.2.2 Air Test. The air test shall be made by 
attaching an air compressor testing apparatus to 
any suitable opening after closing all other inlets 
and outlets to the system, forcing air into the 
system until there is a uniform gauge pressure of 
five (5) psi (34.5 kPa) or sufficient pressure to 
balance a column of mercury ten (10) inches (254 
mm) in height. This pressure shall be held without 
introduction of additional air for a period of at 
least fifteen (15) minutes. Schedule 40 plastic DWV 
systems shall not be tested by the air test method. 

1109.2.3 Exceptions. When circumstances 
exist that make air and water tests described in 
Sections 1109.2.1 and 1109.2.2 above impractical, 
see Section 103.5.3.3. 



142 



STORM DRAINAGE 



Table 11-1 



TABLE 11-1 
Sizing Roof Drains, Leaders, and Vertical Rainwater Piping' 



Size of Drain, 




Maximum Allowable Horizontal Projected Roof Areas 




Leader, or Pipe, 


Flow, 




Square 


Feet at Various Rainfall Rates 




Indies 


gpm 
















1 \nJh 


2inyh 


3\nJh 


4 inTh 5 inJh 


Sinyh 


2 


23 


2,176 


1,088 


725 


544 435 


363 


3 


67 


6440 


3,220 


2,147 


1,610 1,288 


1,073 


4 


144 


13,840 


6,920 


4,613 


3,460 2,768 


2,307 


5 


261 


25,120 


12,560 


8,373 


6,280 5,024 


4,187 


6 


424 


40,800 


20,400 


13,600 


10,200 8,160 


6,800 


8 


913 


88,000 


44,000 


29,333 


22,000 17,600 


14,667 



TABLE 11-1 (Metric) 
Sizing Roof Drains, Leaders, and Vertical Rainwater Piping" 



Size of Drain 
Leader or Pipe, Flow, 
mm L/s 



Maximum Allowable Horizontal Projected Roof Areas 
Square Meters at Various Rainfall Rates 

25mm/h 50 mm/h 75 mm/h 100mm/h 125mm/h 150 mm/h 



50 


1.5 


202 


101 


67 


51 


40 


34 


80 


4.2 


600 


300 


200 


150 


120 


100 


100 


9.1 


1,286 


643 


429 


321 


257 


214 


125 


16.5 


2,334 


1,117 


778 


583 


467 


389 


150 


26.8 


3,790 


1,895 


1,263 


948 


758 


632 


200 


57.6 


8,175 


4,088 


2,725 


2,044 


1,635 


1,363 



Notes: 

1 . The sizing data for vertical conductors, leaders, and drains are based on the pipes flowing 7/24 full. 

2. For rainfall rates other than those listed, determine the allowable roof area by dividing the area given in the 
1 inch/hour (25 mm/hour) column by the desired rainfall rate. 

3. Vertical piping may be round, square, or rectangular. Square pipe shall be sized to enclose its equivalent 
round pipe. Rectangular pipe shall have at least the same cross-sectional area as its equivalent round pipe, 
except that the ratio of its side dimensions shall not exceed 3 to 1 . 



143 



Table 1 1 -2 



UNIFORM PLUMBING CODE 



TABLE 11-2 
Sizing of Horizontal Rainwater Piping' 



Size of 


Flow at Maximum Allowable Horizontal Projected Roof Areas 




Pipe, 


1/8 in^ft. Slope, Square 


Feet at Various Rainfall Rates 




Inches 


gpm 












1 inTh 2 mJh 


3 inyh 


4inyh 


5'mJh 


6 \nJi\ 


3 


34 3,288 1 ,644 


1,096 


822 


657 


548 


4 


78 7,520 3,760 


2,506 


1,880 


1,504 


1,253 


5 


139 13,360 6,680 


4,453 


3,340 


2,672 


2,227 


6 


222 21,400 10,700 


7,133 


5,350 


4,280 


3,566 


8 


478 46,000 23,000 


15,330 


1 1 ,500 


9,200 


7,670 


. 10 


860 82,800 41 ,400 


27,600 


20,700 


16,580 


13,800 


12 


1,384 133,200 66,600 


44,400 


33,300 


26,650 


22,200 


15 


2,473 238,000 119,000 


79,333 


59,500 


47,600 


39,650 



Size of Flow at 
Pipe, 1/4 inyft. Slope, 
inches gpm 



Maximum Allowable Horizontal Projected Roof Areas 
Square Feet at Various Rainfall Rates 



1 inVh 



2in7h 



SinTh 



4inyh 



5 inTh 



SinTh 



3 

4 

5 

6 

8 

10 

12 

15 



48 

110 

196 

314 

677 

1,214 

1,953 

3,491 



4,640 

10,600 

18,880 

30,200 

65,200 

116,800 

188,000 

336,000 



2,320 

5,300 

9,440 

15,100 

32,600 

58,400 

94,000 

168,000 



1,546 

3,533 

6,293 

10,066 

21 ,733 

38,950 

62,600 

112,000 



1,160 

2,650 

4,720 

7,550 

16,300 

29,200 

47,000 

84,000 



928 

2,120 

3,776 

6,040 

13,040 

23,350 

37,600 

67,250 



773 

1,766 

3,146 

5,033 

10,866 

19,450 

31,350 

56,000 



Size of Flow at 
Pipe, 1/2 InVft. Slope, 
Inches gpm 



Maximum Allowable Horizontal Projected Roof Areas 
Square Feet at Various Rainfall Rates 



1 mJh 



2mJh 



3 inyh 



4lnyh 



5 inVh 



6 in./h 



3 

4 

5 

6 

8 

10 

12 

15 



68 

156 

278 

445 

956 

1,721 

2,768 

4,946 



6,576 

15,040 

26,720 

42,800 

92,000 

165,600 

266,400 

476,000 



3288 

7,520 

13,360 

21 ,400 

46,000 

82,800 

133,200 

238,000 



2,192 

5,010 

8,900 

14,267 

30,650 

55,200 

88,800 

158,700 



1,644 

3,760 

6,680 

10,700 

23,000 

41,400 

66,600 

119,000 



1,310 

3,010 

5,320 

8,580 

18,400 

33,150 

53,200 

95,200 



1096 

2500 

4450 

7140 

15,320 

27,600 

44,400 

79,300 



Notes: 

1 . The sizing data for horizontal piping are based on the pipes flowing full. 

2. For rainfall rates other than those listed, determine the allowable roof area by dividing the area given in the 
1 inch/hour (25 mm/hour) column by the desired rainfall rate. 



144 



STORM DRAINAGE 



Table 11 -2 (Metric) 



TABLE 11-2 (Metric) 
Sizing of Horizontal Rainwater Piping' 



Size of 


Flow at l\/laximum Allowable Horizontal Projected 


1 Roof Areas 




Pipe, 


10 mm/m Slope, 


Square 1 


Meters at Various Rainfall Rates 




mm 


L/s 














25 mm/h 


50 mm/h 


75 mm/h 


100 mm/h 


125 mm/h 


150 mm/h 


80 


2.1 305 


153 


102 


76 


61 


51 


100 


4.9 700 


350 


233 


175 


140 


116 


125 


8.8 1,241 


621 


414 


310 


248 


207 


150 


14.0 1,988 


994 


663 


497 


398 


331 


200 


30.2 4,273 


2,137 


1,424 


1,068 


855 


713 


250 


54.3 7,692 


3,846 


2,564 


1,923 


1,540 


1,282 


300 


87.3 12,375 


6,187 


4,125 


3,094 


2,476 


2,062 


375 


156.0 22,110 


11,055 


7,370 


5,528 


4,422 


3,683 



Size of Flow at 
Pipe, 20 mm/m Slope, 
mm Us 



Maximum Allowable Horizontal Projected Roof Areas 
Square Meters at Various Rainfall Rates 



80 
100 
125 
150 
200 
250 
300 
375 



3.0 

6.9 

12.4 

19.8 

42.7 

76.6 

123.2 

220.2 



25 mm/h 50 mm/h 75 mm/h 100 mm/h 125 mm/h 150 mm/h 



431 
985 
1,754 
2,806 
6,057 
10,851 
17,465 
31,214 



216 
492 
877 
1,403 
3,029 
5,425 
8,733 
15,607 



144 

328 

585 

935 

2,019 

3,618 

5,816 

10,405 



108 

246 

438 

701 

1,514 

2,713 

4,366 

7,804 



86 

197 

351 

561 

1,211 

2,169 

3,493 

6,248 



72 

164 

292 

468 

1009 

1807 

2912 

5202 



Size of Flow at 
Pipe, 40 mm/m Slope, 
mm L/s 



Maximum Allowable Horizontal Projected Roof Areas 
Square Meters at Various Rainfall Rates 



80 

100 

125 

150 

200 

250 

300 

375 



4.3 

9.8 

17.5 

28.1 

60.3 

108.6 

174.6 

312.0 



25 mm/h 50 mm/h 75 mm/h 100 mm/h 125 mm/h 150 mm/h 



611 
1,400 
2,482 
3,976 
8,547 
15,390 
24,749 
44,220 



305 
700 
1,241 
1,988 
4,273 
7,695 
12,374 
22,110 



204 
465 
827 
1,325 
2,847 
5,128 
8,250 
14,753 



153 

350 

621 

994 

2,137 

3,846 

6,187 

1 1 ,055 



122 

280 

494 

797 

1,709 

3,080 

4,942 

8,853 



102 

232 

413 

663 

1,423 

2,564 

4,125 

7,367 



Notes: 

1 . The sizing data for horizontal piping are based on the pipes flowing full. 

2. For rainfall rates other than those listed, determine the allowable roof area by dividing the area given in the 
1 inch/hour (25 mm/hour) column by the desired rainfall rate. 



145 



Table 11-3 



UNIFORM PLUMBING CODE 







TABLE 11-3 












Size of Gutters 






Diameter of Gutter 












in Inches 




Maximum Rainfall in 


Inches per Hour 






1/16 inyft. Slope 


2 


3 


4 


5 


6 


3 


340 


226 


170 


136 


113 


4 


720 


' 480 


360 


288 


240 


5 


1,250 


834 


625 


500 


416 


6 


1,920 


1,280 


960 


768 


640 


7 


2,760 


1,840 


1 ,380 


1,100 


918 


8 


3,980 


2,655 


1,990 


1,590 


1,325 


10 


7,200 


4,800 


3,600 


2,880 


2,400 


Diameter of Gutter 












in Inches 




Maximum Rainfall in 


Inches per Hour 






1/8 inTft. Slope 


2 


3 


4 


5 


6 


3 


480 


320 


240 


192 


160 


4 


1,020 


681 


510 


408 


340 


5 


1,760 


1,172 


880 


704 


587 


6 


2,720 


1,815 


1,360 


1,085 


905 


7 


3,900 


2,600 


1,950 


1,560 


1,300 


8 


5,600 


3,740 


2,800 


2,240 


1,870 


10 


10,200 


6,800 


5,100 


4,080 


3,400 


Diameter of Gutter 












in Inches 




Maximum Rainfall in 


Inches per Hour 






1/4 InVft. Slope 


2 


3 


4 


5 


6 


3 


680 


454 


340 


272 


226 


4 


1,440 


960 


720 


576 


480 


5 


2,500 


1,668 


1,250 


1,000 


834 


6 


3,840 


2,560 


1,920 


1,536 


1,280 


7 


5,520 


3,680 


2,760 


2,205 


1,840 


8 


7,960 


5,310 


3,980 


3,180 


2,655 


10 


14,400 


9,600 


7,200 


5,750 


4,800 


Diameter of Gutter 












in Inches 




Maximum Rainfall in 


Inches per Hour 






1/2 inVft. Slope 


2 


3 


4 


5 


6 


3 


960 


640 


480 


384 


320 


4 


2,040 


1,360 


1,020 


816 


680 


5 


3,540 


2,360 


1,770 


1,415 


1,180 


6 


5,540 


3,695 


2,770 


2,220 


1,850 


7 


7,800 


5„200 


3,900 


3,120 


2,600 


8 


11,200 


7,460 


5,600 


4,480 


3,730 


10 


20,000 


13,330 


10,000 


8,000 


6,660 



146 



STORM DRAINAGE 



Table 11-3 (Metric) 







TABLE 11- 


■3 (Metric) 










Size of Gutters 






Diameter of 












Gutter in mm 




Maximum Rainfall In Millimeters 


per Hour 




5.2 mm/m Slope 


50.8 


76.2 


101.6 


127.0 


152.4 


80 


31.6 


21.0 


15.8 


12.6 


10.5 


100 


66.9 


44.6 


33.4 


26.8 


22.3 


125 


116.1 


77.5 


58.1 


46.5 


38.7 


150 


178.4 


119.1 


89.2 


71.4 


59.5 


175 


256.4 


170.9 


128.2 


102.2 


85.3 


200 


369.7 


246.7 


184.9 


147.7 


123.1 


250 


668.9 


445.9 


334.4 


267.6 


223.0 


Diameter of 












Gutter in mm 




Maximum Rainfall In Millimeters 


per Hour 




10.4 mm/m Slope 


50.8 


76.2 


101.6 


127.0 


152.4 


80 


44.6 


29.7 


22.3 


17.8 


14.9 


100 


94.8 


63.3 


47.4 


37.9 


31.6 


25 


163.5 


108.9 


81.8 


65.4 


54.5 


150 


252.7 


168.6 


126.3 


100.8 


84.1 


175 


362.3 


241.5 


181.2 


144.9 


120.8 


200 


520.2 


347.5 


260.1 


208.1 


173.7 


250 


947.6 


631.7 


473.8 


379 


315.9 


Diameter of 












Gutter In mm 




Maximum Rainfall In Millimeters 


per Hour 




20.9 mm/m Slope 


50.8 


76.2 


101.6 


127.0 


152.4 


80 


63.2 


42.2 


31.6 


25.3 


21.0 


100 


133.8 


89.2 


66.9 


53.5 


44.6 


125 


232.3 


155.0 


116.1 


92.9 


77.5 


150 


356.7 


237.8 


178.4 


142.7 


118.9 


175 


512.8 


341.9 


256.4 


204.9 


170.9 


200 


739.5 


493.3 


369.7 


295.4 


246.7 


250 


133.8 


891.8 


668.9 


534.2 


445.9 


Diameter of 












Gutter in mm 




Maximum Rainfall In Millimeters 


per Hour 




41 .7 mm/m Slope 


50.8 


76.2 


101.6 


127.0 


152.4 


80 


89.2 


59.5 


44.6 


35.7 


29.7 


100 


189.5 


126.3 


94.8 


75.8 


63.2 


125 


328.9 


219.2 


164.4 


131.5 


109.6 


150 


514.7 


343.3 


257.3 


206.2 


171.9 


175 


724.6 


483.1 


362.3 


289.9 


241.4 


200 


1,40.5 


693.0 


520.2 


416.2 


346.5 


250 


1 ,858.0 


1,238.4 


929.0 


743.2 


618.7 



147 



UNIFORM PLUMBING CODE 



148 



CHAPTER 12 

FUEL PIPING 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



1201.0 Scope of Gas Piping. 

(A) Coverage of piping systems shall extend 
from the point of delivery to the connections 
with each gas utilization device. For other 
than undiluted liquefied petroleum gas 
systems, the point of delivery shall be 
considered the outlet of the service meter 
assembly, or the outlet of the service 
regulator or service shutoff valve where no 
meter is provided. For undiluted liquefied 
petroleum gas systems, the point of delivery 
shall be considered the outlet of the final 
pressure regulator, exclusive of the line gas 
regulators, in the system. [NFPA 54: 1.1.1.1(A)] 

(B) Piping systems requirements shall include 
design, materials, components, fabrications, 
assembly, installation, testing inspection, 
operation, and maintenance. [NFPA 54: 1.1.1.1(C)] 

(C) This code shall not apply to the following 
(reference standards for some of which 
appear in Appendix L [NFPA 54: 1.1.1.2]): 

(1) Portable LP-Gas equipment of all 
types that is not connected to a 
fixed fuel piping system. 

(2) Installation of farm equipment such 
as brooders, dehydrators, dryers, 
and irrigation equipment. 

(3) Raw material (feedstock) applications, 
except for piping to special 
atmosphere generators. 

(4) Oxygen-fuel gas cutting and 
welding systems. 

(5) Industrial gas applications using 
gases such as acetylene and acetylenic 
compounds, hydrogen, ammonia, 
carbon monoxide, oxygen, and nitrogen. 

(6) Petroleum refineries, pipeline 
compressor or pumping stations, 
loading terminals, compounding 
plants, refinery tank farms, and 
natural gas processing plants. 

(7) Large integrated chemical plants or 
portions of such plants where 
flammable or combustible liquids 
or gases are produced by chemical 
reactions or used in chemical 
reactions. 

(8) LP-Gas installations at utility gas 
plants. 

(9) Liquefied natural gas (LNG) 
installations. 



(10) Fuel gas piping in power and 
atomic energy plants. 

(11) Proprietary items of equipment, 
apparatus, or instruments such as 
gas-generating sets, compressors, 
and calorim.eters. 

(12) LP-Gas equipment for vaporization, 
gas mixing, and gas m^anufacturing. 

(13) LP-Gas piping for buildings under 
construction or renovations that are 
not to become part of the 
permanent building piping system — 
that is, temporary fixed piping for 
building heat. 

(14) Installation of LP-Gas systems for 
railroad switch heating. 

(15) Installation of LP-Gas and comp- 
ressed natural gas systems on vehicles. 

(16) Gas piping, meters, gas-pressure 
regulators, and ottier appurtenances 
used by the serving gas supplier in 
distribution of gas, other than 
undiluted LP-Gas. 



1202.0 General. 

The regulations of this chapter shall govern the 
installation of all fuel gas piping ui or in connection 
with any building or structure or within the property 
lines of any premises up to 5 psi, other than service 
pipe. Fuel oil piping systems shall be installed in 
accordance with NFPA 31. 



1203.0 Definitions. 

For the purposes of this code, these definitions shall 
apply to this chapter. Certain terms, phrases, words., 
and their derivatives shall be interpreted as set forth 
in this section, provided, however, that whenever the 
words "gas meters" appear, they shall be construed 
to also mean valves and those devices required for 
the regulation of pressure and the measurement of 
natural gas being dispensed for any building, 
structure, or premises. 

1203.1 Appliance Fuel Connector - An assembly 
of listed semi-rigid or flexible tubing and fittings to 
carry fuel between a fuel-piping outlet and a fuel- 
burning appliance. 

1 203.2 Fuel Gas - Natural, manufactured, liquefied 
petroleum, or a mixture of these. 



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149 



1203.3-1206.1 



UNIFORM PLUMBING CODE 



1203.3 Gas Piping - Any installation of pipe, 
valves, or fittings that is used to convey fuel gas, 
installed on any premises or in any building, but 
shall not include: 

(1) Any portion of the service piping. 

(2) Any approved piping connection six (6) feet 
(1,829 mm) or less in length between an 
existing gas outlet and a gas appliance 
in the same rooni with the outlet. 

1203.4 Gas-Piping System - Any arrangement of gas 
piping supplied by one (1) meter, and each arrange- 
ment of gas piping serying a building, structure, or 
premises, whether individually metered or not. 

1203.5 Liquefied Petroleum Gas (LPG) Facilities - 

Liquefied petroleum gas (LPG) facilities means 
tanks, containers, container valves, regulating 
equipment, meters, and /or appurtenances for the 
storage and supply of liquefied petroleum gas for 
any building, structure, or premises. 

NFPA 1203.6 Provision for Location of Point of Delivery - 

NFPA 

NFPA The location of the point of delivery shall be 
NFPA acceptable to the serving gas supplier. [NFPA 54: 5.2] 

1203.7 Quick-Disconnect Device - A hand- 
operated device that provides a means for connecting 
and disconnecting an appliance or an appliance 
connector to a gas supply and that is equipped with 
an automatic means to shut off the gas supply when 
the device is disconnected. 

1203.8 Service Piping - The piping and equipment 
between the street gas main and the gas piping 
system inlet that is installed by, and is under the 
control and maintenance of, the serving gas supplier. 

1203.9 Transition Gas Riser - Any listed or 
approved section or sections of pipe and fittings 
used to convey fuel gas and installed in a gas piping 
system for the purpose of providing a transition 
from belowground to aboveground. 

1204.0 Inspection. 

1204.1 Upon completion of the installation, altera- 
tion, or repair of any gas piping, and prior to the use 
thereof, the Authority Having Jurisdiction shall be 
notified that such gas piping is ready for inspection. 

1204.2 All excavations required for the installation 
of underground piping shall be kept open until such 
time as the piping has been inspected and approved. 
If any such piping is covered or concealed before 
such approval, it shall be exposed upon the direction 
of the Authority Having Jurisdiction. 

1 204.3 The Authority Having Jurisdiction shall make 
the following inspections and either shall approve 
that portion of the work as completed or shall notify 
the permit holder wherein the same fails to comply 
with this code. 



1204.3.1 Rough Piping Inspection. 

This inspection shall be made after all gas piping 
authorized by the permit has been installed and 
before any such piping has been covered or 
concealed or any fixture or appliance has been 
attached thereto. This inspection shall include a 
determination that the gas-piping size, material, 
and installation meet the requirements of this code. 

1204.3.2 Final Piping Inspection. 

This inspection shall be made after all piping 
authorized by the permit has been installed and 
after all portions thereof that are to be covered or 
concealed are so concealed and before any 
fixtures, appliance, or shutoff valve has been 
attached thereto. This inspection shall be in 
accordance with Section 1214.1. Test gauges 
used in conducting tests shall comply with 
Section 319.0, Test Gauges. 

1204.4 In cases where the work authorized by the 
permit consists of a minor installation of additional 
piping to piping already connected to a gas meter, 
the foregoing inspections may be waived at the 
discretion of the Authority Having Jurisdiction. In 
this event, the Authority Having Jurisdiction shall 
make such inspection as deemed advisable in order 
to be assured that the work has been performed in 
accordance with the intent of this code. 

1205.0 Certificate of Inspection. 

1205.1 If, upon final piping inspection, the 
installation is found to comply with the provisions of 
this code, a certificate of inspection may be issued by 
the Authority Having Jurisdiction. 

1 205.2 A copy of the certificate of such final piping 
inspection shall be issued to the serving gas supplier 
supplying gas to the premises. 

1205.3 It shall be unlawful for any serving gas 
supplier, or person furnishing gas, to turn on or 
cause to be turned on, any fuel gas or any gas meter 
or meters, until such certificate of final inspection, as 
herein provided, has been issued. 

1206.0 Authority to Render Gas Service. 

1206.1 It shall be unlawful for any person, firm, or 
corporation, excepting an authorized agent or 
employee of a person, firm, or corporation engaged 
in the business of furnishing or supplying gas and 
whose service pipes supply or connect with the 
particular premises, to turn on or reconnect gas 
service in or on any premises where and when gas 
service is, at the time, not being rendered. 



150 



FUEL PIPING 



1206.2-1209.4 



1 206.2 It shall be unlawful to turn on or connect gas 
in or on any premises unless all outlets are properly 
and securely connected to gas appliances or capped 
or plugged with screw joint fittings. 

1207.0 Authority to Disconnect. 

1207.1 The Authority Having Jurisdiction or the 
serving gas supplier is hereby authorized to 
disconnect any gas piping or appliance or both that 
shall be found not to conform to the requirements of 
this code or that may be found defective and in. such 
condition as to endanger life or property. 

1207.2 Where such disconnection has been made, a 
notice shall be attached to such gas piping or 
appliance or both that shall state the same has been 
disconnected, together with the reasons thereof. 

1207.3 It shall be unlawful to remove or disconnect 
any gas piping or gas appliance without capping or 
plugging with a screw joint fitting the outlet from 
which said pipe or appliance was removed. All 
outlets to which gas appliances are not connected 
shall be left capped gastight on any piping system 
that has been installed, altered, or repaired. 

Exception: When an approved listed quick- 
disconnect device is used. 

1208.0 Temporary Use of Gas. 

Where temporary use of gas is desired and the 
Authority Having Jurisdiction deems the use 
necessary, a permit may be issued for such use for a 
period of time not to exceed that designated by the 
Authority Having Jurisdiction, provided that such 
gas-piping system otherwise conforms to the 
requirements of this code regarding material, sizing, 
and safety. 

1209.0 Gas-Piping System Design, Materials, and 
Components. 

1209.1 Piping Plan. 

1209.1.1 Installation of Piping System. Where 
required by the Authority Having Jurisdiction, a 
piping sketch or plan shall be prepared before 
proceeding with the installation. This plan shall 
show the proposed location of piping, the size of 
different branches, the various load demands, 
and the location of the point of delivery. 

1209.1.2 Addition to Existing System. When 
additional gas utilization equipment is being 
connected to a gas-piping system, the existing 
piping shall be checked to determine whether it 
has adequate capacity (see Section 1209.4.3). If 



inadequate, the existing system shall be enlarged 
as required, or separate gas piping of adequate 
capacity shall be provided. 

1209.2 Provision for Location of Point of Delivery. 

The location of the point of delivery shall be 
acceptable to the serving gas supplier. 

1209.3 Interconnections Between Gas-Piping 
Systems. 

1209.3.1 Interconnections Supplying Separate 
Users. Where two or more meters, or two or 
more service regulators where meters are not 
provided, are located on the same premises and 
supply separate users, the gas-piping systems 
shall not be interconnected on the outlet side of 
the meters or service regulators. 

1209.3.2 Interconnections for Standby Fuels. 

Where a supplementary gas for standby use is 
connected downstream from a meter or a service 
regulator where a meter is not provided, a device 
to prevent backflow shall be installed. A three- 
way valve installed to admit the standby supply 
and, at the same time, shut off the regular supply, 
shall be permitted to be used for this purpose. 

1209.4 Sizing of Gas-Piping Systems. 

1209.4.1 General Considerations. Gas-piping 
systems shall be of such size and so installed as to 
provide a supply of gas sufficient to meet the 
niaximum demand without undue loss of pressure 
between the point of delivery and the gas 
utilization equipment. 

1209.4.2 Maximum Gas Demand. The volume 
of gas to be provided (in cubic feet per hour) shall 
be determined directly from the manufacturer's 
input ratings of the gas utilization equipment 
served. Where the input rating is not indicated, 
the gas supplier, equipment manufacturer, or a 
qualified agency shall be contacted or the rating 
from Table 12-1 shall be used for estimating the 
volume of gas to be supplied. The total connected 
hourly load shall be used as the basis for piping 
sizing, assuming all equipment is operating at 
full capacity simultaneously. 

Exception: Sizing shall be permitted to be 
based upon established load diversity factors. 



151 



Table 12-1 -1209.5 



UNIFORM PLUMBING CODE 



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TABLE 12-1 
Approximate Gas Input for Typical Appliances 



Appliance Input Btu^. (Approx.) 


Space Heating Units 




Warm air furnace 




Single family 


100,000 


Multifamily, per unit 


60,000 


Hydronic boiler 




Single family 


100,000 


Multifamily, per unit 


60,000 


Space-and Water-Heating Units 




Hydronic boiler 




Single family 


120,000 


Multifamily, per unit 


75,000 


Water-Heating Appliances 




Water heater, automatic 




storage 30 to 40 gal. tank 


35,000 


Water heater, automatic 




storage 50 gal. tank 


50,000 


Water heater, automatic instantaneous 




Capacity at 2 gal. /minute 


142,800 


Capacity at 4 gal. /minute 


285,000 


Capacity at 6 gal. /minute 


428,400 


Water heater, domestic. 




circulating or side-arm 


35,000 


Cooking Appliances 




Range, freestanding. 




domestic 


65,000 


Built-in oven or broiler unit. 




domestic 


25,000 


Built-in top unit. 




domestic 


40,000 


Other Appliances 




Refrigerator 


3,000 


Clothes dryer. Type 1 




(domestic) 


35,000 


Gas fireplace direct vent 


40,000 


Gas log 


80,000 


Barbecue 


40,000 


Gaslight 


2,500 



For SI units: 1 Bhi per hour = 0.293 W 
[NFPA 54: Table 5.4.2.1] 



1209.4.3 Sizing Methods. Gas piping shall be 
sized in accordance with one of the following: 
[NFPA 54: 5.4.3] 

(1) Pipe sizing tables or sizing equations in this 
chapter. 

(2) Other approved engineering methods 
acceptable to the Authority Having 
Jurisdiction. 

(3) Sizing tables included in a listed piping 
system manufacturer's installation 
instructions. 

1209.4.4 Allowable Pressure Drop. The design 
pressure loss in any piping system under 
maximum "probable flow conditions, from the 
point of delivery to the inlet connection of the 
gas utilization equipment, shall be such that the 
supply pressure at the equipment is greater than 
the minimum pressure required for proper 
equipment operation. [NFPA 54: 5.4.4] 

1209.5 Acceptable Piping Materials and Joining 
Methods. 

1209.5.1 General. 

1209.5.1.1 Materials. Materials used for 
piping systems shall comply with the 
requirements of this chapter or shall be 
acceptable to the Authority Having 
Jurisdiction. [NFPA 54: 5.6.1.1] 

1209.5.1.2 Used Materials. Pipe, fittings, 
valves, or other materials shall not be used 
again unless they are free of foreign materials 
and have been ascertained to be adequate for 
the service intended. [NFPA 54: 5.6.1.2] 

1209.5.1.3 Other Materials. Material not 
covered by the standards specifications listed 
herein shall be investigated and tested to 
determine that it is safe and suitable for the 
proposed service and, in addition, shall be 
recommended for that service by the 
manufacturer and shall be acceptable to the 
Authority Having Jurisdiction. [NFPA 54: 5.6.1.3] 

1209.5.2 Metallic Pipe. 

1209.5.2.1 Cast-iron pipe shall not be used. 
[NFPA 54: 5.6.2.1] 

1209.5.2.2 Steel and wrought-iron pipe 
shall be at least of standard weight 
(Schedule 40) and shall comply with one of 
the following standards: [NFPA 54: 5.6.2.2] 

(1) ANSI/ASME B36.10, Welded and 
Seamless Wrought-Steel Pipe 

(2) ASTM A 53, Standard Specification 
for Pipe, Steel, Black and Hot-Dipped, Zinc- 
Coated Welded and Seamless 



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152 



FUEL PIPING 



1209.5 



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(3) ASTM A 106, Standard Specification for 
Seamless Carbon Steel Pipe for High- 
Temperature Service 

1209.5.2.3 Copper and brass pipe shall riot be 
used if the gas contains more than an average 
of 0.3 grains of hydrogen sulfide per 100 scf of 
gas (0.7 mg/100 L). [NFPA 54: 5.6.2.3] 

Threaded copper, brass, or aluminum 
alloy pipe shall not be used with gases 
corrosive to such material. [NFPA 54: 5.6.2.4] 

1209.5.2.4 Aluminum alloy pipe shall 
comply with ASTM B 241, Specification for 
Aluminum-Alloy Seamless Pipe and Seamless 
Extruded Tube (except that the use of alloy 
5456 is prohibited) and shall be marked at 
each end of each length indicating 
compliance. Aluminum alloy pipe shall be 
coated to protect against external corrosion 
where it is in contact with masonry, plaster, or 
insulation or is subject to repeated wettings 
by such liquids as water, detergents, or 
sewage. [NFPA 54: 5.6.2.5] Aluminum alloy 
pipe shall not be used in exterior locations or 
underground. [NFPA 54: 5.6.2.6] 

1209.5.3 Metallic Tubing. Seamless copper, 
aluminum alloy, or steel tubing shall not be used 
with gases corrosive to such material. [NFPA 54: 
5.6.3] 

1209.5.3.1 Steel tubing shall comply with 
ASTM A 539, Standard Specification for 
Electric Resistance-Welded Coiled Steel Tubing 
for Gas and Fuel Oil Lines, or ASTM A 254, 
Standard Specification for Copper Brazed Steel 
Tubing. [NFPA 54: 5.6.3.1] 

1209.5.3.2 Copper and brass tubing shall 
not be used if the gas contains more than an 
average of 0.3 g of hydrogen sulfide per 100 
scf of gas (0.7 mg/100 L). Copper tubing 
shall comply with standard Type K or L of 
ASTM B 88, Specification for Seamless Copper 
Water Tube, or ASTM B 280, Specification for 
Seamless Copper Tube for Air-Conditioning and 
Refrigeration Field Service. [NFPA 54: 5.6.3.2] 

1209.5.3.3 Aluminum alloy tubing shall 
comply with ASTM B 210, Specification for 
Aluminum-Alloy Drawn Seamless Tubes, or 
ASTM B 241, Specification for Aluminum Alloy 
Seamless Pipe and Seamless Extruded Tube. 
Aluminum alloy tubing shall be coated to 
protect against external corrosion where it is 
in contact with masonry, plaster, or 
insulation or is subject to repeated wettings 
by liquids such as water, detergent, or 
sewage. Aluminum alloy tubing shall not be 
used in exterior locations or underground. 
[NFPA 54: 5.6.3.3] 



1 209.5.3.4 Corrugated stainless steel tubing 
shall be tested and listed in compliance with 
the construction, installation, and performance 
requirements of ANSI /IAS LC-1, Standard 
for Fuel Gas Piping Systems Using Corrugated 
Stainless Steel Tubing. [NFPA 54: 5.6.3.4] 

1209.5.4 Plastic Pipe, Tubing, and Fittings. 

Plastic pipe, tubing, and fittings shall be used 
outside underground only and shall conform 
with ASTM D 2513, Standard Specification for 
Thermoplastic Gas Pressure Pipe, Tubing, and 
Fittings. Pipe to be used shall be marked "gas" 
and "ASTM D 2513." [NFPA 54: 5.6.4] 

Anodeless risers shall comply with the 
following: [NFPA 54: 5.6.4.1] 

1209.5.4.1 Factory-assembled anodeless 
risers shall be recommended by the 
manufacturer for the gas used and shall be 
leak-tested by the manufacturer in 
accordance with written procedures. [NFPA 
54: 5.6.4.1(1)] 

1 209.5.4.2 Service head adapters and field- 
assembled anodeless risers incorporating 
service head adapters shall be 
recommended by the manufacturer for the 
gas used by the manufacturer and shall be 
design-certified to meet the requirements of 
Category I of ASTM F 1973, Factory 
Assembled Anodeless Riser and Transition 
Fitting on Polyethylene (PE) Fuel Gas 
Distribution Systems and the code of Federal 
Regulations, Title 49, Part 192.281(e). The 
manufacturer shall provide the user with 
qualified installation instructions as 
prescribed by the code of Federal 
Regulations, Title 49, Part 192.283(b). [NFPA 
54: 5.6.4.1(2)] 

1209.5.4.3 The use of plastic pipe, tubing, 
and fittings in undiluted liquefied 
petroleum gas-piping systems shall be in 
accordance with NFPA 58, Liquefied 
Petroleum Gas Code. [NFPA 54: 5.6.4.1(3)] 

1209.5.5 Workmanship and Defects. Gas pipe 
or tubing and fittings shall be clear and free from 
cutting burrs and defects in structure or 
threading, and shall be thoroughly brushed and 
chip and scale blown. Defects in pipe, tubing, 
and fittings shall not be repaired. Defective 
pipe, tubing, and fittings shall be replaced. 
[NFPA 54: 5.6.5] 

1209.5.6 Protective Coating. Where in contact 
with material or atmosphere exerting a corrosive 
action, metallic piping and fittings coated with a 



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153 



1209.5 



UNIFORM PLUMBING CODE 



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corrosion-resistant material shall be used. 
External or internal coatings or linings used on 
piping or components shall not be considered as 
adding strength. [NFPA 54: 5.6.6] 

1209.5.7 Metallic Pipe Threads. 

(A) Specifications for Pipe Threads. Metallic 
pipe and fitting threads shall be taper pipe 
threads and shall comply with ANSI/ASME 
Bl.20.1, Standard for Pipe Threads, General 
Purpose (Inch). [MFPA 54: 5.6.7.1] 

(B) Damaged Threads. Pipe with threads that 
are stripped, chipped, corroded, or otherwise 
damaged shall not be used. Where a weld 
opens during the operation of cutting or 
threading, that portion of the pipe shall not 
be used. [NPPA 54: 5.6.7.2] 

(C) Number of Threads. Field threading of 
metallic pipe shall be in accordance with 
Table 12-2. [NFPA 54: 5.6.7.3] 

(D) Thread Compounds. Thread (joint) 
compounds (pipe dope) shall be resistant to 
the action of liquefied petroleum gas or to 
any other chemical constituents of the gases 
to be conducted through the piping. 

TABLE 12-2 
Specifications for Threading Metallic Pipe 





Approximate Length 


Approximate 


Iron Pipe 


of Threaded 


No. of 


Size (in.) 


Portion (in.) 


Threads to Be Cut 


1/2 


3/4 


10 


3/4 


3/4 


10 


1 


7/8 


10 


1-1/4 


1 


11 


1-1/2 


1 


11 


2 


1 


11 


2-1/2 


1-1/2 


12 


3 


1-1/2 


12 


4 


1-5/8 


13 



For SI units, 1 in. = 25.4 mm. [NFPA 54: 5.6.7.3] 

1209.5.8 Metallic Piping Joints and Fittings. 

The type of piping joint used shall be suitable for 
the pressure-temperature conditions and shall 
be selected giving consideration to joint 
tightness and mechanical strength under the 
service conditions. The joint shall be able to 
sustain the maximum end force due to the 
internal pressure and any additional forces due 
to temperature expansion or contraction, 
vibration, fatigue, or to the weight of the pipe 
and its contents. [NFPA 54: 5.6.8] 



1209.5.8.1 Pipe Joints. Pipe joints shall be 
threaded, flanged, brazed, or welded. 
Where nonferrous pipe is brazed, the 
brazing materials shall have a melting point 
in excess of 1,000°F (538°C). Brazing alloys 
shall not contain more than 0.05 percent 
phosphorus. [NFPA 54: 5.6.8.1] 

1209.5.8.2 Tubing Joints. Tubing joints 
shall either be made with approved gas 
tubing fittings or be brazed with a material 
having a melting point in excess of 1,000°F 
(538°C). Brazing alloys shall not contain 
more than 0.05 percent phosphorus. [NFPA 
54:5.6.8.2] 

1209.5.8.3 Flared Joints. Flared joints 
shall be used only in systems constructed 
from nonferrous pipe and tubing where 
experience or tests have demonstrated that 
the joint is suitable for the conditions and 
where provisions are made in the design to 
prevent separation of the joints. [NFPA 54: 
5.6.8.3] 

1209.5.8.4 Metallic Fittings (Including 
Valves, Strainers, Filters). [NFPA 54: 
5.6.8.4] 

(1) Threaded fittings in sizes larger than 4 
in. (100 mm) shall not be used unless 
acceptable to the Authority Having 
Jurisdiction. 

(2) Fittings used with steel or wrought-iron 
pipe shall be steel, brass, bronze, 
malleable iron, or cast iron. 

(3) Fittings used with copper or brass pipe 
shall be copper, brass, or bronze. 

(4) Fittings used with aluminum alloy pipe 
shall be of aluminum alloy. 

(5) Cast-iron Fittings. 

(a) Flanges shall be permitted. 

(b) Bushings shall not be used. 

(c) Fittings shall not be used in 
systems containing flammable 
gas-air mixtures. 

(d) Fittings in sizes 4 inches (100 mm) 
and larger shall not be used 
indoors unless approved by the 
Authority Having Jurisdiction. 

(e) Fittings in sizes 6 inches (150 mm) 
and larger shall not be used 
unless approved by the 
Authority Having Jurisdiction. 

(6) Aluminum Alloy Fittings. Threads shall 
not form the joint seal. 



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154 



FUEL PIPING 



1209.5 -1209.6 



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(7) Zinc-Aluminum Alloy Fittings. Fittings 
shall not be used in systems containing 
flammable gas-air n\ixtures. 

(8) Special Fittings. Fittings such as 
couplings; proprietary-type joints; 
saddle tees; gland-type compression 
fittings; and flared, flareless, or 
compression-type tubing fittings 
shall be (1) used within the fitting 
manufacturers' pressure-temperature 
recommendations; (2) used within the 
service conditions anticipated with 
respect to vibration, fatigue, thermal 
expansion, or contraction; (3) installed 
or braced to prevent separation of the 
joint by gas pressure or external 
physical damage; and (4) acceptable to 
the Authority Having Jurisdiction. 

1209.5.9 Plastic Piping, Joints, and 
Fittings. 

Plastic pipe, tubing, and fittings shall be 
joined in accordance with the manufacturers' 
instructions. The following shall be observed 
when making such joints: [NFPA 54: 5.6.9] 

(A) The joint shall be designed and installed 
so that the longitudinal puUout 
resistance of the joint will be at least 
equal to the tensile strength of the plastic 
piping material. [NFPA 54: 5.6.9(1)] 

(B) Heat-fusion joints shall be made in 
accordance with qualified procedures that 
have been established and proven by test 
to produce gastight joints at least as 
strong as the pipe or tubing being joined. 
Joints shall be made with the joining 
method recommended by the pipe 
manufacturer. Heat-fusion fittings shall 
be marked "ASTM D 2513." [NFPA 54: 
5.6.9(2)1 

(C) Where compression-type mechanical 
joints are used, the gasket material in the 
fitting shall be compatible with the 
plastic piping and with the gas 
distributed by the system. An internal 
tubular rigid stiffener shall be used in 
conjunction with the fitting. The stiffener 
shall be flush with the end of the pipe or 
tubing and shall extend at least to the 
outside end of the pipe or tubing and 
shall extend at least to the outside end of 
the compression fitting when installed. 
The stiffener shall be free of rough or 
sharp edges and shall not be a forced fit 



in the plastic. Split tubular stiffeners shall 
not be used. [NFPA 54: 5.6.9(3)] 

(D) Plastic piping joints and fittings for use 
in liquefied petroleum gas-piping 
systems shall be in accordance with 
Liquefied Petroleum Gas Code, NFPA 58. 
[NFPA 54: 5.6.9(4)] 

1209.5.10 Flanges. AU flanges shall comply with 
ANSI/ASME B16.1, Standard for Cast Iron Pipe 
Flanges and Flanged Fittings; ANSI/ASME B16.20, 
Standard for Ring-Joint Gaskets and Grooves for Steel 
Pipe Flanges; or MSS SP-6, Standard Finishes for 
Contact Faces of Pipe Flanges and Connecting-End 
Flanges of Valves and Fittings. The pressure- 
temperature ratings shall equal or exceed that 
required by the application. [NFPA 54: 5.6.10] 

(A) Flange Facings. Standard facings shaU be 
permitted for use under this code. Where 
150-psi (1,090 kPa) steel flanges are bolted to 
Class 125 cast-iron flanges, the raised face 
on the steel flange shall be removed. [NFPA 
54:5.6.10.1] 

(B) Lapped Flanges. Lapped flanges shall be used 
only aboveground or in exposed locations 
accessible for inspection. [NFPA 54: 5.6.10.2] 

1209.5.11 Flange Gaskets. The material for 
gaskets shall be capable of withstanding the 
design temperature and pressure of the piping 
system and the chemical constituents of the gas 
being conducted without change to its chemical 
and physical properties. The effects of fire 
exposure to the joint shall be considered in 
choosing the material. [NFPA 54: 5.6.11] 

(1) Acceptable materials include the following: 
[NFPA 54: 5.6.11.1] 

(a) Metal or metal-jacketed asbestos (plain 
or corrugated) 

(b) Asbestos 

(c) Aluminum "O" rings and spiral-wound 
metal gaskets 

(2) When a flanged joint is opened, the gasket 
shall be replaced. [NFPA 54: 5.6.11.2] 

(3) Full-face gaskets shall be used with all bronze 

and cast-iron flanges. [NFPA 54: 5.6.11.3] 

1209.6 Gas Meters. 

1209.6.1 Capacity. Gas meters shall be selected 
for the maximum expected pressure and 
permissible pressure drop. [NFPA 54: 5.7.1] 

1209.6.2 Location. 

(A) Gas meters shall be located in ventilated 
spaces readily accessible for examination, 
reading, replacement, or necessary 
maintenance. [NFPA 54: 5.7.2.1] 



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155 



1209.6-1209.7 



UNIFORM PLUMBING CODE 



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(B) Gas meters shall not be placed where they 
will be subjected to damage, such as 
adjacent to a drive w^ay; under a fire escape; 
in public passages, halls, or coal bins; or 
where they will be subject to excessive 
corrosion or vibration. [NFPA 54: 5.7.2.2] 

(C) Gas meters shall be located at least 3 feet (0.9 
m) from sources of ignition. [NFPA 54: 5.7.2.3] 

(D) Gas meters shall not be located where they 
will be subjected to extreme temperatures or 
sudden extreme changes in temperature. 
Meters shall not be located in areas where 
they are subjected to temperatures beyond 
those recommended by the manufacturer. 
[NFPA 54: 5.7.2.4] 

1209.6.3 Supports. Gas meters shall be 
supported or connected to rigid piping so as not to 
exert a strain on the meters. Where flexible 
connectors are used to connect a gas meter to 
downstream piping at mobile homes in mobile 
home parks, the meter shall be supported by a 
post or bracket placed in a firm footing or by other 
means providing equivalent support. [NFPA 54: 
5.7.3] 

1209.6.4 Meter Protection. Meters shall be 
protected against overpressure, back-pressure, 
and vacuum where such conditions are 
anticipated. [NFPA 54: 5.7.4] 

1209.6.5 Identification. Gas piping at multiple 
meter installations shall be marked by a metal 
tag or other permanent means attached by the 
installing agency, designating the building or 
the part of the building being supplied. [NFPA 
54:5.7.5] 

1209.7 Gas Pressure Regulators. 

1209.7.1 Where Required. A line gas pressure 
regulator or gas equipment pressure regulator, 
as applicable, shall be installed where the gas 
supply pressure is higher than that at which the 
branch supply line or gas utilization equipment 
is designed to operate or varies beyond design 
pressure liniits. [NFPA 54: 5.8.1] 

1209.7.2 Listing. The line gas pressure regulator 
shall be listed in accordance with ANSI Z21.80. 
[NFPA 54: 5.8.2] 

1209.7.3 Location. The gas pressure regulator 
shall be accessible for servicing. [NFPA 54: 5.8.3] 

1209.7.4 Regulator Protection. Pressure 
regulators shall be protected against physical 
damage. [NFPA 54: 5.8.4] 

1209.7.5 Venting. 

(A) Line Gas Pressure Regulators. [NFPA 54: 
5.8.5.1] 



(1) An independent vent to the outside of 
the building, sized in accordance with 
the regulator manufacturer's instructions, 
shall be provided where the location of 
a regulator is such that a ruptured 
diaphragm will cause a hazard. Where 
there is more than one regulator at a 
location, each regulator shall have a 
separate vent to the outside or, if 
approved by the Authority Having 
Jurisdiction, the vent lines shall be 
permitted to be manifolded in 
accordance with accepted engineering 
practices to minimize back-pressure in 
the event of diaphragm failure. [See 
NFPA 54:5.9.7] for information on 
properly locating the vent.) Materials 
for vent piping shall be in accordance 
with Section 1209.5. 

Exception: A regulator and vent- 
limiting means combination listed 
as complying with ANSI Z21.80, 
Standard for Line Pressure Regulators, 
shaU be permitted to be used without 
a vent to the outdoors. 

(2) The vent shall be designed to prevent 
the entry of water, insects, or other 
foreign materials that could cause 
blockage. 

(3) At locations where regulators might be 
submerged during floods, a special 
antiflood-type breather vent fitting shall 
be installed, or the vent line shall be 
extended above the height of the 
expected flood waters. 

(4) A regulator shall not be vented to the 
gas equipment flue or exhaust system. 

(B) Gas Appliance Pressure Regulators. 

Venting of Gas Appliance Pressure Regulators. 
Venting of gas appliance pressure regulators shall 
comply with the following requirements: [NFPA 
54:9.1.19] 

(1) Gas appliance pressure regulators requiring 
access to the atmosphere for successful operation 
shall be equipped with vent piping leading 
outdoors or, if the regulator vent is, an integral 
part of the equipment, into the combustion 
chamber adjacent to a continuous pilot, unless 
constructed or equipped with a vent-limiting 
means to limit the escape of gas from the vent 
opening in the event of diaphragm failure. 

(2) Vent-limiting means shall be employed on listed 
gas appliance pressure regulators only. 



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156 



FUEL PIPING 



1209.7-1209.11 



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(4) 



(5) 



(6) 



(3) In the case of vents leading outdoors, means shall 
be employed to prevent water from entering this 
piping and also to prevent blockage of vents by 
insects and foreign matter. 

Under no circumstances shall a regulator be 
vented to the gas utilization equipment flue or 
exhaust system. 

In the case of vents entering the combustion 
chamber, the vent shall be located so the escaping 
gas will be readily ignited by the pilot and the 
heat liberated thereby will not adversely affect 
the normal operation of the safety shutoff system. 
The terminus of the vent shall be securely held in 
a fixed position relative to the pilot. For 
manufactured gas, the need for aflame arrester in 
the vent piping shall be determined. 

Vent lines from a gas appliance pressure 
regulator and bleed lines from a diaphragm-type 
valve shall not be connected to a common 
manifold terminating in a combustion chamber. 
Vent lines shall not terminate in positive- 
pressure- type combustion chambers. 

(C) Discharge of Vents [NFFA 54: 5.9.7] 

(1) The discharge stacks, vents, or outlet parts of 
all pressure-relieving and pressure-limiting 
devices shall be located so that gas is safely 
discharged into the outside atmosphere. 

(2) Discharge stacks or vents shall be designed 
to prevent the entry of water, insects, or any 
other foreign material that could cause 
blockage. The discharge stack or vent line 
shall be at least the same size as the outlet of 
the pressure-relieving device. 

1209.7.6 Bypass Piping. Valved and regulated 
bypasses shall be permitted to be placed around 
gas line pressure regulators where continuity of 
service is imperative. [MFPA54: 5.8.6] 

1209.7.7 Identification. Line pressure regulators 
at multiple regulator installations shall be 
marked by a metal tag or other permanent 
means designating the building or the part of the 
building being supplied. [NFPA 54: 5.8.7] 

1209.8 Back-Pressure Protection. 

1209.8.1 Wtiere to Install. Protective devices 
shall be installed as close to the utilization 
equipment as practical, where the design of 
utilization equipment connected is such that 
air, oxygen, or standby gases could be forced 
into the gas supply system. [NFPA 54: 5.10.1.1] 
Gas and air combustion mixers incorporating 
double diaphragm "zero" or "atmosphere" 
governors or regulators shall require no further 
protection unless connected directly to 



compressed air or oxygen at pressures of 5 psi 
(34 kPa) or more. [NFPA 54: 5.10.1.2] 

1209.8.2 Protective Devices. Protective 
devices shall include but not be limited to the 
following: [NFPA 54: 5.10.2] 

(1) Check valves 

(2) Three-way valves (of the type that 
completely closes one side before starting to 
open the other side) 

(3) Reverse flow indicators controlling positive 
shutoff valves 

(4) Normally closed air-actuated positive 
shutoff pressure regulators 

1209.9 Low-Pressure Protection. 

A protective device shall be installed between the 
meter and the gas utilization equipment if the 
operation of the equipment (i.e., gas compressors) is 
such that it could produce a vacuum or a dangerous 
reduction in gas pressure at the meter. Such devices 
include, but are not limited to, mechanical, 
diaphragm-operated, or electrically operated low- 
pressure shutoff valves. [NFPA 54: 5.11] 

1209.10 Shutoff Valves. Shutoff valves shall be 
approved and shall be selected giving consideration 
to pressure drop, service involved, emergency use, 
and reliability of operation. Shutoff valves of size 1 
inch (25 mm) National Pipe Thread and smaller shall 
be listed. [NFPA 54: 5.12] 

1209.11 Expansion and Flexibility. 

1209.11.1 Design. Piping systems shall be 
designed to have sufficient flexibility to prevent 
thermal expansion or contraction from causing 
excessive stresses in the piping material, 
excessive bending or loads at joints, or 
undesirable forces or moments at points of 
connections to equipment and at anchorage or 
guide points. Formal calculations or model tests 
shall be required only where reasonable doubt 
exists as to the adequate flexibility of the 
system. [NFPA 54: 5.13.1] 

Flexibility shall be provided by the use of 
bends, loops, offsets, or couplings of the slip 
type. Provision shall be made to absorb thermal 
changes by the use of expansiori joints of the 
bellows type, or by the use of "ball" or "swivel" 
joints. Expansion joints of the slip type shall not 
be used inside buildings or for thermal 
expansion. Where expansion joints are used, 
anchors or ties of sufficient strength and rigidity 
shall be installed to provide for end forces due to 
fluid pressure and other causes. [NFPA 54: 5.13.1.1] 

Pipe alignment guides shall be used with 
expansion joints according to the recommended 
practice of the joint manufacturer. [NFPA 54: 
5.13.1.2] 



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157 



1209.11 -1211.1 



UNIFORM PLUMBING CODE 



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1209.11.2 Special Local Conditions. Where 
local conditions include earthquake, tornado, 
unstable ground, or flood hazards, special 
consideration shall be given to increased 
strength and flexibility of piping supports and 
connections. [NFPA 54: 5.13.2] 



1210.0 Excess Flow Valve. When automatic excess 
flow gas shutoff devices (valves) are used, they shall 
be listed and approved and shall be sized for the 
maximum flow anticipated for the main or branch of 
the fuel gas system in which the excess flow valve is 
installed. 



1211.0 Gas Piping Installation. 

1211.1 Piping Underground. 

1 21 1 .1 .1 Clearances. Undergroimd gas piping 
shall be installed with sufficient clearance from 
any other underground structure to avoid 
contact therewith, to allow maintenance, and to 
protect against damage from proximity to other 
structures. In addition, underground plastic 
piping shall be installed with sufficient clearance 
or shall be insulated from any source of heat so 
as to prevent the heat from impairing the 
serviceability of the pipe. [JNJFPA 54: 7.1.1] 

1211.1.2 Protection Against Damage. 

(A) Cover Requirements. Underground piping 
systems shall be installed with a minimum 
of 18 inches (460 mm) of cover. Where external 
damage to the pipe is not likely to result, the 
minimum cover shall be 12 inches (300 mm). 
Where a minimumi of 12 inches (300 mm) of 
cover cannot be provided, the pipe shall be 
installed in conduit or bridged (shielded). 
[NFPA 54: 7.1.2.1] 

(B) Trenches. The trench shall be graded so 
that the pipe has a firm, substantially 
continuous bearing on the bottom of the 
trench. [NFPA 54: 7.1.2.2] 

(C) Backfilling. Where flooding of the trench is 
done to consolidate the backfill, care shall be 
exercised to see that the pipe is not floated 
from its firm bearing on the trench bottom. 
[NFPA 54: 7.1.2.3] 

1211.1.3 Protection Against Corrosion. Gas 

piping in contact with earth or other material 
that could corrode the piping shall be protected 
against corrosion in an approved manner. When 
dissimilar metals are joined underground, an 
insulating coupling or fitting shall be used. 
Piping shall not be laid in contact with cinders. 
Uncoated threaded or socket- welded joints shall 



not be used in piping in contact with soil or 
where internal or external crevice corrosion is 
known to occur. [NFPA 54: 7.1.3] 

1211.1.4 Protection Against Freezing. Where 
the formation of hydrates or ice is known to 
occur, piping shall be protected against freezing. 
[NFPA 54: 7.1.4] 

1211.1.5 Piping Through Foundation Wall. 

Underground piping, w^here installed through 
the outer foundation or basement wall of a 
building, shall be encased in a protective pipe. 
The space between the gas piping and the 
building shall be sealed to prevent entry of gas 
or water. [NFPA 54: 7.1.5] 

1211.1.6 Piping Underground Beneath 
Buildings. Where the installation of gas piping 
underground beneath buildings is unavoidable, 
the piping shall be encased in an approved 
conduit designed to withstand the superimposed 
loads. [NFPA 54: 7.1.6] The conduit shall extend 
into a normally usable and accessible portion of 
the building and, at the point where the conduit 
terminates in the building, the space between the 
conduit and the gas piping shall be sealed to 
prevent the possible entrance of any gas leakage. 
Where the end sealing is of a type that will retain 
the full pressure of the pipe, the conduit shall be 
designed for the same pressure as the pipe. The 
conduit shall extend at least 4 inches (100 mm) 
outside the building, be vented above grade to 
the outside, and be installed so as to prevent the 
entrance of water and insects. [NFPA 54: 7.1.6.1] 

1211.1.7 Plastic Pipe. 

(A) Connection of Plastic Piping. Plastic 
pipe shall be installed outside, iinderground 
only. [NFPA 54: 7.1.7.1] 

Exception No. 1: Plastic pipe shall be 
permitted to terminate aboveground 
where an anodeless riser is used. 

Exception No. 2: Plastic pipe shall be 
permitted to terminate with a wall head 
adapter aboveground in buildings, 
including basements, where the plastic 
pipe is inserted in a piping material 
permitted for use in buildings. 

(B) Connections made outside and 
underground between metallic and plastic 
piping shall be made only with ASTM D 
2513, Standard Specification for Thermoplastic 
Gas Pressure Pipe, Tubing, and Fittings, 
Category I transition fittings. [NFPA 54: 7.1.7.2] 

(C) An electrically continuous corrosion- 
resistant tracer wire (minimum AWG 14) or 
tape shall be buried with the plastic 
pipe to facilitate locating. One end shall be 



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158 



FUEL PIPING 



1211.1 -1211.3 



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brought aboveground at a building wall or 
riser. [NFPA 54: 7.1.7.3] 

1211.2 Installation of Piping. 

1211.2.1 Piping installed aboveground shall be 
securely supported and located where it will be 
protected from physical damage (also see 
1211.1.4). Where passing through an outside 
wall, the piping shall also be protected against 
corrosion by coating or wrapping with an inert 
material approved for such applications. Where 
piping is encased in a protective pipe sleeve, the 
annular space between the gas piping and the 
sleeve shall be sealed at the wall to prevent the 
entry of water, insects, or rodents. [NFPA 54: 7.2.1] 

1211.2.2 Building Structure. 

(1) The installation of gas piping shall not cause 
structural stresses within building components 
to exceed allowable design limits. [NFPA 
54: 7.2.2.1] 

(2) Approval shall be obtained before any 
beams or joists are cut or notched. [NFPA 54: 
7.2.2.2] Permission shall be obtained from the 
Authority Having Jurisdiction. 

1211.2.3 Other than Dry Gas. Drips, sloping, 
protection from freezing, and branch pipe 
cormections, as provided for in Section 1211.1.4, 
1211.6.1, and Section 1211.8, shall be provided 
when other than dry gas is distributed and 
climactic conditions make such provisions 
necessary. [NFPA 54: 7.2.3] 

1211.2.4 Gas Piping to be Sloped. Piping for 
other than dry gas conditions shall be sloped not 
less than 1/4 inch in 15 feet (8 mm in 4572 mm) 
to prevent traps. [NFPA 54: 7.2.4] 

1211.2.4.1 Ceiling Locations. Gas piping 
shall be permitted to be installed in 
accessible spaces between a fixed ceiling and 
a dropped ceiling, whether or not such 
spaces are used as a plenum. Valves shall 
not be located in such spaces. 

Exception: Equipment shutoff valves 
required by this code shall be permitted 
to be installed in accessible spaces 
containing vented gas utilization 
equipment. 

1211.2.5 Prohibited Locations. Gas piping 
inside any building shall not be installed in or 
through a circulating air duct, clothes chute, 
chimney or gas vent, ventilating duct, 
dumbwaiter, or elevator shaft. This provision 
shall not apply to ducts used to provide 
combustion and ventilation air in accordance 
with Section 507.0 or to above-ceiling spaces as 
covered in Section 1211.2.4.1. 

1211.2.6 Hangers, Supports, and Anchors. 

(A) Piping shall be supported with pipe hooks. 



metal pipe straps, bands, brackets, or 
hangers suitable for the size of piping; be of 
adequate strength and quality; and located 
at intervals so as to prevent or damp out 
excessive vibration. Piping shall be 
anchored to prevent undue strains on 
connected equipment and shall not be 
supported by other piping. Pipe hangers 
and supports shall conform to the 
requirements of ANSI/MSS SP-58, Pipe 
Hangers and Supports - Materials, Design and 
Manufacture. [NFPA 54: 7.2.6.1] 

(B) Spacings of supports in gas-piping 
installations shall not be greater than shown 
in Table 12-3. Spacing of supports for CSST 
shall be in accordance with the CSST 
manufacturer's instruction. [NFPA 54: 7.2.6.2] 

(C) Supports, hangers, and anchors shall be 
installed so as not to interfere with the free 
expansion and contraction of the piping 
between anchors. All parts of the supporting 
equipment shall be designed and installed 
so they will not be disengaged by 
movement of the supported piping. 
[NFPA 54: 7.2.6.3] 

TABLE 12-3 
Support of Piping 

steel Pipe, Spacing of Nominal Size of Spacing of 

Nominal Size Supports Tubing Supports 

of Pipe (ft.) Smooth-wall (ft.) 

(in.) (In. O.D.) 



1/2 


6 


1/2 


4 


3/4 or 1 


8 


5/8 or 3/4 


6 


1-1/4 or larger 


10 


7/8 or 1 


8 


(horizontal) 




(horizontal) 




1-1/4 or larger 


every floor 


1 or larger 


every floor 


(vertical) 


level 


(vertical) 


level 



For SI units: 1 ft. - 0.305 m. [NFPA 54: Table 7.2.6.2] 

1211.2.7 Removal of Pipe. Where piping 
containing gas is to be removed, the line shall 
be first disconnected from all sources of gas 
and then thoroughly purged with air, water, 
or inert gas before any cutting or welding is 
done. (See Section 1214.6.) [NFPA 54: 7.2.7] 

1211.3 Concealed Piping in Buildings. 

1211.3.1 General. Gas piping in concealed 
locations shall be installed in accordance with 
this section. [NFPA 54: 7.3.1] 

1211.3.2 Connections. Where gas piping is to 
be concealed, unions, tubing fittings, right and 



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159 



1211.3-1211.5 



UNIFORM PLUMBING CODE 



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left couplings, bushings, swing joints, and 
compression couplings made by combinations of 
fittings shall not be used. Connections shall be of 
the following type: [NFPA 54: 7.3.2] 

(1) Pipe fittings such as elbows, tees, and 
couplings. 

(2) Joining tubing by brazing (see Section 1209.5.8.2). 

(3) Fittings listed for use in concealed spaces 
that have been demonstrated to sustain, 
without leakage, any forces due to 
temperature expansion or contraction, 
vibration, or fatigue based on their 
geographic location, application, or operation. 

(4) Where necessary to insert fittings in gas pipe 
that has been installed in a concealed 
location, the pipe shall be reconnected by 
welding, flanges, or the use of a ground joint 
union with the nut center-punched to 
prevent loosening by vibration. 

1211.3.3 Piping in Partitions. Concealed gas 
piping shall not be located in solid partitions. 
[NFPA 54: 7.3.3] 

1211.3.4 Tubing in Partitions. This provision 
shall not apply to tubing that pierces walls, 
floors, or partitions or to tubing installed 
vertically and horizontally inside hollow walls or 
partitions without protection along its entire 
concealed length where both of the following 
requirements are met: [NFPA 54: 7.3.4] 

(1) A steel striker barrier not less than 0.0508 
inches (1.3 mm) thick, or equivalent, is 
installed between the tubing and the 
finished wall and extends at least 4 inches 
(100 mm)beyond concealed penetrations of 
plates, fire stops, w^all studs, and so on. 

(2) The tubing is installed in single runs and is 
not rigidly secured. 

1211.3.5 Piping in Floors. In industrial 
occupancies, gas piping in solid floors such as 
concrete shall be laid in channels in the floor and 
covered to permit access to the piping with a 
minimum of damage to the building. Where 
piping in floor channels could be exposed to 
excessive moisture or corrosive substances, the 
piping shall be protected in an approved 
manner. [NFPA 54: 7.3.5.1] 

Exception: In other than industrial occupancies 
and where approved by the Authority Having 
Jurisdiction, gas piping embedded in concrete 
floor slabs constructed with portland cement 
shall be surrounded with a minimum of 1-1/2 
inches (38 mm) of concrete and shall not be in 
physical contact with other metallic structures 
such as reinforcing rods or electrically neutral 
conductors. All piping, fittings, and risers shall 



be protected against corrosion in accordance 
with Section 1209.5.6. Piping shall not be 
embedded in concrete slabs containing quick-set 
additives or cinder aggregate. [NFPA 54: 7.3.5.2] 

1211.4 Piping in Vertical Chases. (See Section 
1202.0.) Where gas piping exceeding 5 psi (34 kPa) is 
located within vertical chases in accordance with 
Section 1211.5, the requirements of Sections 1211.5.1 
through 1211.5.3 shall apply. [NFPA 54: 7.4] 

1211.5 Maximum Design Operating Pressure. The 

maximum design operating pressure for piping 
systems located inside buildings shall not exceed 5 
psi (34 kPa) unless one or more of the following 
conditions are met: [NFPA 54: 5.5.1] 

(1) The piping system is welded. 

(2) The piping is located in a ventilated chase or 
otherwise enclosed for protection against 
accidental gas accumulation. 

(3) The piping is located inside buildings or 
separate areas of buildings used exclusively 
for one of the following: 

(a) Industrial processing or heating 

(b) Research 

(c) Warehousing 

(d) Boiler or mechanical equipment rooms 

(4) The piping is a temporary installation for 
buildings under construction. 

1211.5.1 Pressure Reduction. (See Section 
1202.0.) Where pressure reduction is required in 
branch connections for compliance with Section 
1211.5, such reduction shall take place either 
inside the chase or immediately adjacent to the 
outside wall of the chase. Regulator venting and 
downstream overpressure protection shall comply 
with Section 1209.7.4 and NFPA Section 5.9. The 
regulator shall be accessible for service and repair 
and vented in accordance with one of the 
following: [NFPA 54: 7.4.1] 

(1) Where the fuel gas is lighter than air, 
regulators equipped with a vent-limiting 
means shall be permitted to be vented into 
the chase. Regulators not equipped with a 
vent-limiting means shall be permitted to be 
vented either directly to the outdoors or to a 
point within the top 1 foot (0.3m) of the chase. 

(2) Where the fuel gas is heavier than air, the 
regulator vent shall be vented only directly 
to the outdoors. 

1211.5.2 Construction. Chase construction 
shall comply with local building codes with 
respect to fire resistance and protection of 
horizontal and vertical openings. [NFPA 54: 
7.4.2] 



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160 



FUEL PIPING 



1211.5-1211.8 



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1211.5.3 Ventilation. A chase shall be 
ventilated to the outdoors and only at the top. 
The openings shall have a minimum free area (in 
square inches) equal to the product of one-half 
of the maximum pressure in the piping (in psi) 
times the largest nominal diameter of that piping 
(in inches), or the cross-sectional area of the 
chase, whichever is smaller. Where more than 
one fuel gas piping system is present, the free 
area for each system shall be calculated and the 
largest area used. [NFPA 54: 7.4.3] 

121 1 .6 Gas Pipe Turns. Changes in direction of gas 
pipe shall be made by the use of fittings, or factory 
bends. [NFPA 54: 7.5] 

1211.6.1 l\/letallic Pipe. Metallic pipe bends 
shall comply with the following: [NFPA 54: 
7.5.1] 

(1) Bends shall be made only with bending 
equipment and procedures intended for that 
purpose. 

(2) All bends shall be smooth and free from 
buckling, cracks, or other evidence of 
mechanical damage. 

(3) The longitudinal weld of the pipe shall be 
near the neutral axis of the bend. 

(4) The pipe shall not be bent through an arc of 
more than 90 degrees. 

(5) The inside radius of a bend shall be not less 
than six times the outside diameter of the 
pipe. 

1211.6.2 Plastic Pipe. Plastic pipe bends shall 
comply with the following: [NFPA 54: 7.5.2] 

(1) The pipe shall not be damaged, and the 
internal diameter of the pipe shall not be 
effectively reduced. 

(2) Joints shall not be located in pipe bends. 

(3) The radius of the inner curve of such bends 
shall not be less than 25 times the inside 
diameter of the pipe. 

(4) Where the piping manufacturer specifies the 
use of special bending equipment or 
procedures, such equipment or procedures 
shall be used. 

1211.6.3 Elbows. Factory-made welding 
elbows or transverse segments cut therefrom 
shall have an arc length measured along the 
crotch of at least 1 inch (25 mm) for pipe sizes 2 
inches and larger. [NFPA 54: 7.5.3] 

1211.7 Drips and Sediment Traps. 

1211.7.1 Provide Drips Where Necessary. For 

other than dry gas conditions, a drip shall be 
provided at any point in the line of pipe where 



condensate could collect. Where required by the 
Authority Having Jurisdiction or the serving gas 
supplier, a drip shall also be provided at the 
outlet of the meter. This drip shall be so installed 
as to constitute a trap wherein an accumulation 
of condensate will shut off the flow of gas before 
it will run back into the meter. [NFPA 54: 7.6.1] 

1211.7.2 Location of Drips. All drips shall be 
installed only in such locations that they will be 
readily accessible to permit cleaning or 
emptying. A drip shall not be located where the 
condensate is likely to freeze. [NFPA 54: 7.6.2] 

1 21 1 .7.3 Sediment Traps. (See Section 1 21 2.7.) 
1211.8 Outlets. 

1211.8.1 Location and Installation. 

(1) The outlet fittings or piping shall be securely 
fastened in place. [NFPA 54: 7.7.1.1] 

(2) Outlets shall not be located behind doors. 
[NFPA 54: 7.7.1.2] 

(3) Outlets shall be located far enough from 
floors, walls, patios, slabs, and ceilings to 
permit the use of wrenches without 
straining, bending, or damaging the piping. 
[NFPA 54: 7.7.1.3] 

(4) The unthreaded portion of gas piping 
outlets shall extend not less than 1 in. (25 
mm) through finished ceilings or indoor or 
outdoor walls. [NFPA 54: 7.7.1.4] 

(5) The unthreaded portion of gas-piping 
outlets shall extend not less than 2 inches (50 
mm) above the surface of floors or outdoor 
patios or slabs. [NFPA 54: 7.7.1.5] 

(6) The provisions of Sections 1211.7.1 (4) and (5) 
shall not apply to listed quick-disconnect 
devices of the flush-mounted type or listed 
gas convenience outlets. Such devices shall 
be installed in accordance with the manu- 
facturers' installation instructions. [NFPA 
54: 7.7.1.6] 

1211.8.2 Cap All Outlets. 

(A) Each outlet, including a valve, shall be 
closed gastight with a threaded plug or cap 
immediately after installation and shall be 
left closed until the gas utilization 
equipment is connected thereto. When 
equipment is disconnected from an outlet 
and the outlet is not to be used again 
immediately, it shall be closed gastight. 
[NFPA 54: 7.7.2.1] 

Exception No. 1: Laboratory equipment 
installed in accordance with 1212.2(A) 
shall be permitted. 



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161 



1211.8-1211.13 



UNIFORM PLUMBING CODE 



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Exception No. 2: The use of a listed 
quick-disconnect device with integral 
shutoff or listed gas convenience outlet 
shall be permitted. 

(B) Equipment shutoff valves installed in 
fireplaces shall be removed and the piping 
capped gastight where the fireplace is used 
for solid-fuel burning. [NFPA 54: 7.7.2.2] 

1211.9 Branch Pipe Connection. When a branch 
outlet is placed on a main supply line before it is 
known what size pipe will be connected to it, the 
outlet shall be of the same size as the line that 
supplies it. [NFPA 54: 7.8] 

1211.10 i\/lanual Gas Shutoff Valves. (Also see 
Section 1212.4.) 

1211.10.1 Valves at Regulators. An accessible 
gas shutoff valve shall be provided upstream of 
each gas pressure regulator. Where two gas 
pressure regulators are installed in series in a 
single gas line, a manual valve shall not be 
required at the second regulator. [NFPA 54: 7.9.1] 

1211.10.2 Valves Controlling Multiple 
Systems. 

(A) Accessibility of Gas Valves. Main gas 
shutoff valves controlling several gas piping 
systems shall be readily accessible for 
operation and installed so as to be protected 
from physical damage. They shall be 
marked with a metal tag or other permanent 
means attached by the installing agency so 
that the gas piping systems supplied 
through them can be readily identified. 
[NFPA 54: 7.9.2.1] 

(B) Shutoff Valves for Multiple House Lines. 

In multiple-tenant buildings supplied 
through a master meter, or through one 
service regulator where a meter is not 
provided, or where meters or service 
regulators are not readily accessible from 
the equipment location, an individual 
shutoff valve for each apartment or tenant 
line shall be provided at a convenient point 
of general accessibility. 

In a common system serving a number 
of individual buildings, shutoff valves shall 
be installed at each building. [NFPA 54: 
7.9.2.2] 

1211.10.3 Emergency Shutoff Valves. An 

exterior shutoff valve to permit turning off the 
gas supply to each building in an emergency 
shall be provided. The emergency shutoff valves 
shall be plainly marked as such and their 
locations posted as required by the Authority 
Having Jurisdiction. [NFPA 54: 7.9.2.3] 



1211.11 Prohibited Devices. No device shall be 
placed inside the gas piping or fittings that will 
reduce the cross-sectional area or otherwise obstruct- 
the free flow of gas, except where proper allowance 
in the piping system design has been made for such 
a device and where approved by the Authority 
Having Jurisdiction. [NFPA 54: 7.10] 

1211.12 Systems Containing Gas-Air Mixtures 
Outside the Flammable Range. Where gas-air 
mixing machines are employed to produce mixtures 
above or below the flammable range, they shall be 
provided with stops to prevent adjustment of the 
mixture to within or approaching the flammable range. 
[NFPA 54: 7.11] 

1211.13 Systems Containing Flammable Gas-Air 
Mixtures. 

1211.13.1 Required Components. A central 
premix system with a flammable mixture in the 
blower or compressor shall consist of the 
following components: [NFPA 54: 7.12.1] 

(1) Gas-mixing machine in the form of an 
automatic gas-air proportioning device 
combined with a downstream blower or 
compressor. 

(2) Flammable mixture piping, minimum 
Schedule 40 NFS. 

(3) Automatic firechecks. 

(4) Safety blowouts or backfire preventers for 
systems utilizing flammable mixture lines 
above 2-1/2 inch (65 mtn) nominal pipe size 
or the equivalent. 

1211.13.2 Optional Components. 

The following components shall also be 
permitted to be utilized in any type of central 
premix system: [NFPA 54: 7.12.2] 

(1) Flowmeters. 

(2) Flame arresters. 

1211.13.3 Additional Requirements. Gas- 
mixing machines shall have nonsparking 
blowers and shall be so constructed that a 
flashback will not rupture machine casings. 
[NFPA 54: 7.12.3] 

1211.13.4 Special Requirements for Mixing 
Blowers. A mixing blower system shall be 
limited to applications with minimum practical 
lengths of mixture piping. Limited to a maximum 
mixture pressure of 10 inch water column (25 Pa) 
and limited to gases containing no more than 10 
percent hydrogen. 

The blower shall be equipped with a gas- 
control valve at its air entrance so arranged that 
gas is admitted to the airstream; entering the 



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162 



FUEL PIPING 



1211.13-1211.14 



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blower in proper proportions for correct 
combustion by the type of burners employed, 
the said gas-control valve being of either the 
zero governor or mechanical ratio valve type 
that controls the gas and air adjustment 
simultaneously. No valves or other obstructions 
shall be installed between the blower discharge 
and the burner or burners. [NFPA 54: 7.12.4] 

1211.13.5 Installation of Gas-Mixing 
Machines. 

(A) The machine shall be located in a large, 
well-ventilated area or in a small detached 
building or cutoff room provided with room 
construction and explosion vents in 
accordance with sound engineering 
principles. Such rooms or below-grade 
installations shall have adequate positive 
ventilation. [NFPA 54: 7.12.5.1] 

(B) Where gas-mixing machines are installed in 
well-ventilated areas, the type of electrical 
equipment shall be in accordance with 
NFPA 70, National Electrical Code®, for 
general service conditions, unless other 
hazards in the area prevail. Where gas- 
mixing machines are installed in small 
detached buildings or cutoff rooms, the 
electrical equipment and wiring shall be 
installed in accordance with NFPA 70, 
National Electrical Code, for hazardous 
locations (Articles 500 and 501, Class I, 
Division 2). [NFPA 54: 7.12.5.2] 

(C) Air intakes for gas-mixing machines using 
compressors or blowers shall be taken from 
outdoors whenever practical. [NFPA 54: 
7.12.5.3] 

(D) Controls for gas-mixing machines shall 
include interlocks and a safety shutoff valve 
of the manual reset type in the gas supply 
connection to each machine arranged to 
automatically shut off the gas supply in the 
event of high or low gas pressure. Except for 
open burner installations only, the controls 
shall be interlocked so that the blower or 
compressor will stop operating following a 
gas supply failure. Where a system employs 
pressurized air, means shall be provided to 
shut off the gas supply in the event of air 
failure. [NFPA 54: 7.12.5.4] 

(E) Centrifugal gas-mixing machines in parallel 
shall be reviewed by the user and 
equipment manufacturer before installation, 
and means or plans for minimizing these 
effects of downstream pulsation and 
equipment overload shall be prepared and 
utilized as needed. [NFPA 54: 7.12.5.5] 



1211.13.6 Use of Automatic Firechecks, 
Safety Blowouts, or Backfire Preventers. 

Automatic firechecks and safety blowouts or 
backfire preventers shall be provided in piping 
systems distributing flammable air-gas mixtures 
from gas-mixing machines to p>rotect the piping 
and the machines in the event of flashback, in 
accordance with the following: [NFPA 54: 7.12.6] 

(A) Approved automatic firechecks shall be 
installed upstream as close as practicable to 
the burner inlets following the firecheck 
manufacturers' instructions. 

(B) A separate manually operated gas valve 
shall be provided at each automatic 
firecheck for shutting off the flow of gas-air 
mixture through the firecheck after a 
flashback has occurred. The valve shall be 
located upstream as close as practical to the 
inlet of the automatic firecheck. 

CAUTION: 

These valves shall not be reopened after a flashback 
has occurred until the firecheck has cooled 
sufficiently to prevent reignition of the flammable 
mixture and has been reset properly. 

(C) A safety blowout or backfiring preventer 
shall be provided in the mixture line near the 
outlet of each gas-mixing machine where the 
size of the piping is larger than 2-1/2 inch 
(65 mm) NPS, or equivalent, to protect the 
mixing equipment in the event of an 
explosion passing through an automatic 
firecheck. The manufacturers' instructions 
shall be followed when installing these 
devices, particularly after a disc has burst. 

The discharge from the safety blowout 
or backfire preventer shall be located or 
shielded so that particles from the ruptured 
disc cannot be directed toward personnel. 
Wherever there are interconnected 
installations of gas-mixing machines with 
safety blowouts or backfire preventers, 
provision shall be made to keep the mixture 
from other machines from reaching any 
ruptured disc opening. Check valves shall 
not be used for this purpose. 

(D) Large-capacity premix systems provided 
with explosion heads (rupture disc) to 
relieve excessive pressure in pipelines shall 
be located at and vented to a safe outdoor 
location. Provisions shall be provided for 
automatically shutting off the supply of gas- 
air mixture in the event of rupture. 

1211.14 Electrical Bonding and Grounding. 

(A) Each aboveground portion of a gas piping 
system that is likely to become energized 



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163 



1211.14-1212.3 



UNIFORM PLUMBING CODE 



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shall be electrically continuous and bonded 
to an effective ground-fault current path. 
Gas piping shall be considered to be bonded 
when it is connected to gas utilization 
equipment that is connected to the equip- 
ment grounding conductor of the circuit 
supplying that equipment. [NFPA 54: 7.13.1] 

(B) Gas piping shall not be used as a grounding 
conductor or electrode. [NFPA 54: 7.13.2] 

1211.15 Electrical Circuits. Electrical circuits shall 
not utilize gas piping or components as conductors. 
[NFPA 54: 7.14] 

Exception: Low-voltage (50 V or less) control 
circuits, ignition circuits, and electronic flame 
detection device circuits shall be permitted to 
make use of piping or components as a part of 
an electric circuit. 

1211.16 Electrical Connections. 

(A) All electrical connections between wiring 
and electrically operated control devices in 
a piping system shall conform to the 
requirements of NFPA 70, National 
Electrical Code. (See Section 1211.13.) 
[NFPA 54: 7.15.1] 

(B) Any essential safety control depending on 
electric current as the operating medium 
shall be of a type that will shut off (fail safe) 
the flow of gas in the event of current 
failure. [NFPA 54: 7.15.2] 

1212.0 Equipment Connections to Building 
Piping. 

1212.1 Connecting Gas Equipment. Gas utilization 
equipment shall be connected to the building piping 
in compliance with Sections 1212.4 and 1212.5 by 
one of the following: [NFPA 54: 9.6.1] 

(1) Rigid metallic pipe and fittings. 

(2) Semirigid metallic tubing and metallic 
fittings. Aluminum alloy tubing shall not be 
used in exterior locations. 

(3) Listed flexible gas connectors in compliance 
with ANSI Z21.24, Standard for Connectors for 
Gas Appliances. The connector shall be used 
in accordance with the terms of their listing 
that are completely in the same room as the 
equipment. 

(4) CSST where installed in accordance with the 
manufacturer's instructions. 

(5) Listed nonmetallic gas hose connectors in 
accordance with 1212.2. 

(6) Gas-fired food service (commercial cooking) 
equipment listed for use with casters or 
otherwise subject to movement for cleaning, 
and other large and heavy gas utilization 



equipment that can be moved, shall be 
connected in accordance with the connector 
manufacturer's installation instructions 
using a listed appliance connector 
complying with ANSI Z21.69, Standard for 
Connectors for Movable Gas Appliances. 
[NFPA 54: 9.6.1.1] 

(7) In 1212.1(2), (3), and (5), the connector or 
tubing shall be installed so as to be 
protected against physical and thermal 
damage. Aluminum alloy tubing and 
connectors shall be coated to protect against 
external corrosion where they are in contact 
with masonry, plaster, or insulation or are 
subject to repeated wettings by such liquids 
as water (except rain water), detergents, or 
sewage. 

1212.2 Use of Nonmetallic Gas Hose Connectors. 

Listed nonmetallic gas hose connectors shall be used 
in accordance with the terms of their listing and as 
follows: [NFPA 54: 9.6.2] 

(A) indoor. Indoor gas hose connectors shall be 
used only to connect laboratory, shop, and 
ironing equipment requiring mobility 
during operation. An equipment shutoff 
valve shall be installed where the comiector 
is attached to the building piping. The 
connector shall be of minimum length and 
shall not exceed 6 feet (1829 mm). The cormector 
shall not be concealed and shall not extend 
from one room to another or pass through 
wall partitions, ceilings, or floors. 

(B) Outdoor. Outdoor gas hose connectors are 
permitted to connect portable outdoor gas- 
fired equipment. An equipment shutoff 
valve, a listed quick-disconnect device, or 
a listed gas convenience outlet shall be 
installed where the cormector is attached to 
the supply piping and in such a manner to 
prevent the accumulation of water or 
foreign matter. This connection shall be 
made only in the outdoor area where the 
equipment is to be used. The connector 
length shall not exceed 15 feet (4572 mm). 

1212.3 Connection of Portable and Mobile 
Industrial Gas Equipment. 

(A) Where portable industrial gas utilization 
equipment, or equipment requiring mobility 
or subject to vibration, is connected to the 
building gas piping system by the use of a 
flexible hose, the hose shall be suitable and 
safe for the conditions under which it can be 
used. [NFPA 54: 9.6.3.1] 

(B) Where industrial gas utilization equipment 
requiring mobility is connected to the rigid 
piping by the use of swivel joints or 



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164 



FUEL PIPING 



1212.3-1214.1 



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couplings, the swivel joints or couplings 
shall be suitable for the service required, 
and only the minimum number required 
shall be installed. [NFPA 54: 9.6.3.2] 

(C) Where industrial gas utilization equipment 
subject to vibration is connected to the 
building piping system by the use of all- 
metal flexible connectors, the connectors 
shall be suitable for the service required. 
[NFPA 54: 9.6.3.3] 

(D) Where flexible connections are used, they 
shall be of the minimum practical length 
and shall not extend from one room to 
another or pass through any walls, 
partitions, ceilings, or floors. Flexible 
connections shall not be used in any 
concealed location. They shall be protected 
against physical or thermal damage and 
shall be provided with gas shutoff valves in 
readily accessible locations in rigid piping 
upstream from the flexible connections. 
[NFPA 54: 9.6.3.4] 

1212.4 Equipment Shutoff Valves and Connections. 

Gas utilization equipment connected to a piping 
system shall have an accessible, approved manual 
shutoff valve with a nondisplaceable valve member, 
or a listed gas convenience outlet [NFPA 54: 9.6.4], 
installed within 6 feet (1.8 m) of the equipment it 
serves. Where a connector is used, the valve shall be 
installed upstream of the connector. A union or 
flanged connection shall be provided downstream 
from this valve to permit removal of controls. 
Shutoff valves serving decorative gas appliances 
shall be permitted to be installed in fireplaces if 
listed for such use. [NFPA 54: 9.6.4.1] 



Gas supply inlet 



A 



To 

equipment - 
inlet 






"O. 






Niji^le- 



Cap- 



D- 



T 

3 in. (80 mm) 
minimum 

i. 



Figure 12-1 J\Aethod of Installing a Tee Fitting 
Sediment Trap. 

1212.5 Quick-Disconnect Devices. Quick-disconnect 
devices used to connect equipment to the building 
piping shall be listed. [NFPA 54: 9.6.5.1] Where they 
are installed indoors, an approved manual shutoff 



valve with a nondisplaceable valve member shall be 
installed upstream of the quick-disconnect device. 
[NFPA 54: 9.6.5.2] 

1212.6 Support of Chimneys. Ail portions of 
chimneys shall be supported for the design and weight 
of the materials employed. Listed factory-built 
chimneys shall be supported and spaced in accordance 
with their listings and the manufacturers' instructions. 

1212.7 Sediment Trap, Where a sediment trap is 
not incorporated as a part of the gas utilization 
equipment, a sediment trap shall be installed as close 
to the inlet of the equipment as practical at the time 
of equipment installation. The sediment trap shall be 
either a tee fitting with a capped nipple in the bottom 
outlet, as illustrated in Figure 12-1, or oth^r device 
recognized as an effective sediment trap. Illuminating 
appliances, ranges, clothes dryers, decorative vented 
appliances for installation in vented fireplaces, gas 
fireplaces, and outdoor grills shall not be required to 
be so equipped. [NFPA 54: 9.6.7] 

1212.8 Installation of Piping. Piping shall be 
installed in a maimer not to interfere with inspection, 
maintenance, or servicing of the gas utilization 
equipment. [NFPA 54: 9.6.8] 

1213.0 Liquefied Petroleum Gas Facilities and 
Piping. 

Liquefied petroleum gas facilities shall comply with 
NFPA 58, Liquefied Petroleum Gas Code. 

1214.0 Pressure Testing and Inspection. 

1214.1 General. 

1214.1 .1 Prior to acceptance and initial operation, 
all piping installations shall be inspected and 
pressure-tested to determine that the materials, 
design, fabrication, and installation practices 
comply with the requirements of this code. 
[NFPA 54: 8.1.1.1] 

1214.1.2 Inspection shall consist of visual 
examination during or after manufacture, 
fabrication, assembly, or pressure tests, as 
appropriate. Supplementary types of non- 
destructive inspection techniques, such as 
magnetic-particle, radiographic, and ultrasonic, 
shall not be required unless specifically listed 
herein or in the engineering design. [NFPA 54: 
8.1.1.2] 

1214.1.3 Where repairs or additions are made 
following the pressure test, the affected piping 
shall be tested. Minor repairs and additions are 
not required to be pressure-tested provided that 
the work is inspected and connections are tested 
with a noncorrosive leak-detecting fluid or other 
leak-detecting methods approved by the 
Authority Having Jurisdiction. [NFPA 54: 8.1.1.3] 



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165 



1214.1 -1214.4 



UNIFORM PLUMBING CODE 



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1214.1.4 Where new branches are installed from 
the point of delivery to new appliances, orJy the 
newly installed branches shall be required to be 
pressure-tested. Connections between the new 
piping and the existing piping shall be tested 
with a noncorrosive leak-detecting fluid or 
approved leak-detecting methods. [NFPA 54: 
8.1.1.4] 

1214.1.5 A piping system shall be tested as a 
complete unit or in sections. Under no circum- 
stances shall a valve in a line be used as a 
bulkhead between gas in one section of the 
piping system and test medium in an adjacent 
section, unless two valves are installed in series 
with a valved "telltale" located between these 
valves. A valve shall not be subjected to the test 
pressure unless it can be determined that the 
valve, including the valve-closing mechanism, is 
designed to safely withstand the pressure. 
[NFPA 54: 8.1.1.5] 

1 21 4.1 .6 Regulator and valve assemblies fabricated 
independently of the piping system in which they 
are to be installed shall be permitted to be tested 
with inert gas or air at the time of fabrication. 
[NFPA 54: 8.1.1.6] 

1214.1.7 Test Medium. The test medium shall 
be air, nitrogen, carbon dioxide, or an inert gas. 
OXYGEN SHALL NEVER BE USED. [NFPA 54: 
8.1.2] 

1214.2 Test Preparation. 

1214.2.1 Pipe joints, including welds, shall be 
left exposed for examination during the test. 
[NFPA 54: 8.1.3.1] 

Exception: Covered or concealed pipe end 
joints that have been previously tested in 
accordance with this code. 

1 21 4.2.2 Expansion joints shall be provided with 
temporary restraints, if required for the 
additional thrust load under test. [NFPA 54: 
8.1.3.2] 

1214.2.3 Appliances and equipment that are not 
to be included in the test shall be either 
disconnected from the piping or isolated by 
blanks, blind flanges, or caps. Flanged joints at 
which blinds are inserted to blank off other 
equipment during the test shall not be required 
to be tested. [NFPA 54: 8.1.3.3] 

1214.2.4 Where the piping system is connected 
to appliances, equipment, or equipment com- 
ponents designed for operating pressures of less 
than the test pressure, such appliances, equip- 
ment, or equipment components shall be isolated 
from the piping system by disconnecting them 
and capping the outlets. [NFPA 54: 8.1.3.4] 

1214.2.5 Where the piping system is cormected 
to appliances, equipment, or equipment com- 



ponents designed for operating pressures equal to 
or greater than the test pressure, such appliances 
and equipment shall be isolated from the piping 
system by closing the individual appliance 
equipment shutoff valves. [NFPA 54: 8.1.3.5] 

1214.2.6 All testing of piping systems shall be 
done with due regard for the safety of employees 
and the public during the test. Bulkheads, 
anchorage, and bracing suitably designed to resist 
test pressures shall be installed if necessary. Prior 
to testing, the interior of the pipe shall be cleared 
of all foreign material. [NFPA 54: 8.1.3.6] 

1214.3 Test Pressure. 

1214.3.1 Test pressure shall be measured with a 
manometer or with a pressure-measuring device 
designed and calibrated to read, record, or 
indicate a pressure loss due to leakage during 
the pressure test period. The source of pressure 
shall be isolated before the pressure tests are 
made. Mechanical gauges used to measure test 
pressures shall have a range such that the 
highest end of the scale is not greater than five 
times the test pressure. [NFPA 54: 8.1.4.1] 

1214.3.2 The test pressure to be used shall be no 
less than 1-1/2 times the proposed maximum 
working pressure, but not less than 3 psi (20 
kPa), irrespective of design pressure. [NFPA 54: 
8.1.4.2] 

1214.3.3 Test duration shall be not less than 1/2 
hour for each 500 cubic feet (14 m^) of pipe 
volume or fraction thereof. When testing a 
system having a volume less than 10 cubic feet 
(0.28 m^) or a system in a single-family dwelling, 
the test duration shall be a minimuni of 10 
minutes. The duration of the test shall not be 
required to exceed 24 hours. [NFPA 54: 8.1.4.3] 

1214.4 Detection of Leaks and Defects. 

1214.4.1 The piping system shall withstand the 
test pressure specified without showing any 
evidence of leakage or other defects. Any 
reduction of test pressures as indicated by 
pressure gauges shall be deemed to indicate the 
presence of a leak unless such reduction can be 
readily attributed to some other cause. [NFPA 
54: 8.1.5.1] 

1214.4.2 The leakage shall be located by means 
of an approved gas detector, a noncorrosive leak 
detection fluid, or other approved leak detection 
methods. Matches, candles, open flames, or 
other methods that provide a source of ignition 
shall not be used. [NFPA 54: 8.1.5.2] 

1214.4.3 Where leakage or other defects are 
located, the affected portion of the piping system 
shall be repaired or replaced and retested. [See 
Section 1214.1.3.] [NFPA 54: 8.1.5.3] 



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166 



FUEL PIPING 



1214.5-1215.1 



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1214.5 System and Equipment Leakage Test. 

1214.5.1 Test Gases. Leak checks using fuel 
gas shall be permitted in piping systems that 
have been pressure-tested in accordance with 
Section 1214.0. [NFPA 54: 8.2.1] 

1214.5.2 Before Turning Gas On. Before gas is 
introduced into a system of new gas piping, the 
entire system shall be inspected to determine that 
there are no open fittings or ends and all valves at 
unused outlets are closed and plugged or capped. 
[NFPA 54: 8.2.2] 

1214.5.3 Test for Leakage. Immediately after 
the gas is turned on into a new system or into a 
system that has been initially restored after an 
interruption of service, the piping system shall 
be checked for leakage. Where leakage is 
indicated, the gas supply shall be shut off until 
the necessary repairs have been made. [NFPA 
54: 8.2.3] 

1214.5.4 Placing Equipment in Operation. 

Gas utilization equipment shall not be placed in 
operation until after the piping system has been 
tested in accordance with Section 1214.5.3 and 
purged in accordance with Section 1214.6.2. 
[NFPA 54: 8.2.4] 

1214.6 Purging. 

1214.6.1 Removal From Service. When gas 
piping is to be opened for servicing, addition, or 
modification, the section to be worked on shall 
be turned off from the gas supply at the nearest 
convenient point and the line pressure vented to 
the outdoors or to ventilated areas of sufficient 
size to prevent accumulation of flammable 
mixtures. The remaining gas in this section of 
pipe shall be displaced with an inert gas as 
required by Table 12-5. [NFPA 54: 8.3.1] 

TABLE 12-5 

Length of Piping Requiring Purging with Inert 
Gas for Servicing or Modification 

[NFPA 54: Table 8.3.1] 



Nominal Pipe 


Length of Piping 


Size (in.) 


Requiring Purging (ft.) 


2 


>50 


3 


>30 


4 


' >15 


6 


>10 


8 or larger 


Any length 



piping shall be displaced with fuel gas, except 
where such piping is required by Table 12-6 to 
be purged with an inert gas prior to introduction 
of fuel gas. The air can be safely displaced with 
fuel gas provided that a moderately rapid and 
continuous flow of fuel gas is introduced at one 
end of the line and air is vented out at the other 
end. The fuel gas flow shall be continued without 
interruption until the vented gas is free of air. The 
point of discharge shall not be left unattended 
during purging. After purging, the vent shall then 
be closed. Where required by Table 12-6, the air in 
the piping shall first be displaced with an inert 
gas, and the inert gas shall then be displaced with 
fuel gas. [NFPA 54: 8.3.2] 

TABLE 12-6 

Length of Piping Requiring Purging with Inert 
Gas Before Placing in Operation 

[NFPA 54: Table 8.3.2] 



Nominal Pipe 
Size (in.) 



Length of Piping Requiring 
Purging (ft.) 



3 






>30 


4 






>15 


6 






>10 


8 or larger 






Any length 


For SI units: 1 ft. 


= 0.305 


m. 





For SI units: 1 f t = 0.305 m. 

1214.6.2 Placing in Operation. When piping 
full of air is placed in operation, the air in the 



1214.6.3 Discharge of Purged Gases. The 

open end of piping systems being purged shall 
not discharge into confined spaces or areas 
where there are sources of ignition unless 
precautions are taken to perform this operation 
in a safe manner by ventilation of the space, 
control of purging rate, and elimination of all 
hazardous conditions. [NFPA 54: 8.3.3] 

1214.6.4 Placing Equipment in Opereition. 

After the piping has been placed in operation, all 
equipment shall be purged and then placed in 
operation, as necessary. [NFPA 54: 8.3.4] 

1215.0 Interconnections Between Gas Piping 
Systems [NFPA 54: 5.3] 

1215.1 Interconnections Supplying Separate Users. 

Where two or more meters, or two or more service 
regulators where meters are not provided, are 
located on the same premises and supply separate 
users, the gas-piping systems shall not be 
interconnected on the outlet side of the meters or 
service regulators. [NFPA 54: 5.3.1] 



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167 



1215.2-1217.3 



UNIFORM PLUMBING CODE 



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1215.2 Interconnections for Standby Fuels. 

Where supplementary gas for standby use is 
connected downstream from a meter or a service 
regulator where a meter is not provided, a device to 
prevent backflow shall be installed. [NFPA 54: 
5.3.2.1] A three-way valve installed to admit the 
standby supply and at the same time shut off the 
regular supply shall be permitted to be used for this 
purpose. [NFPA 54:5.3.2.2] 

1216.0 Required Gas Supply. 

1216.1 The following regulations, as set forth in this 
section and in Section 1217.0, Required Gas Piping 
Size, shall be the standard for the installation of gas 
piping. All natural gas regulations and tables are 
based on the use of gas having a specific gravity of 
sixty hundredths (0.60), supplied at six (6) to eight (8) 
inches (152-203 mm) water column pressure at the 
outlet of the meter or regulator. Where the natural gas 
supplier cannot maintain a minimum inlet pressure of 
six (6) inches (152 mm) water column pressure. Table 
12-7 allowing a maximum pressure drop of 0.3-inch 
(7.6 mm) water column shall be used. For undiluted 
liquefied petroleum gas, gas piping may be sized at 
eleven (11) inches (279 mm) water column pressure at 
the outlet of the meter or regulator and specific 
gravity of one and fifty htmdredths (1.50). 

Note: Where gas of a different specific gravity is to 
be delivered, the serving gas supplier should be 
contacted for specific gravity conversion factors to 
use in sizing piping systems from the pipe sizing 
tables in this chapter. 

1216.2 The hourly volume of gas required at each 
piping outlet shall be taken as not less than the 
maximum hourly rating as specified by the 
manufacturer of the appliance or appliances to be 
connected to each such outlet. 

1216.3 Where the gas appliances to be installed have 
not been definitely specified. Table 12-1 may be used 
as a reference to estimate requirements of typical 
appliances. 

To obtain the cubic feet per hour (L/sec.) of gas 
required, divide input of appliances by the average 
Btu (Watt-hour) heating value per cubic foot (L) of 
the gas. The average Btu (Watt-hour) per cubic foot 
(L) of the gas in the area of the installation may be 
obtained from the serving gas supplier. 

1 21 6.4 The size of the supply piping outlet for any 
gas appliance shall not be less than one-half (1/2) 
inch (15 mm). 

The minimum size of any piping outlet for a 
mobile home shall be three-quarter (3/4) inch (20 mm). 



1217.0 Required Gas Piping Size. 

1217.1 Pipe Sizing Methods. Where the pipe size 
is to be determined using any of the methods in 
Sections 1217.1.1 through 1217.1.3, the diameter of 
each pipe segment shall be obtained from the pipe- 
sizing tables in Section 1217.2 or from the sizing 
equations in Section 1217.3. [NFPA 54: 6.1] 

1217.1.1 Longest Length Method. The pipe 
size of each section of gas piping shall be 
determined using the longest length of piping 
from the point of delivery to the most remote 
outlet and the load of the section (see calculation 
example in Figure 12-2). [NFPA 54: 6.1.1] 

1217.1.2 Branch Length Method. Pipe shall be 
sized as foUows: [NFPA 54: 6.1.2] 

(A) Pipe size of each section of the longest 
pipe run from the point of delivery to the 
most remote outlet shall be determined 
using the longest run of piping and the 
load of the section. 

(B) The pipe size of each section of branch 
piping not previously sized shall be 
determined using the length of piping, 
from the point of delivery to the most 
remote outlet in each branch and the 
load of the section. 

1217.1.3 Hybrid Pressure. The pipe size for 
each section of higher-pressure gas piping shall 
be determined using the longest length of piping 
from the point of delivery to the most remote 
line pressure regulator. The pipe size from the 
line pressure regulator to each outlet shall be 
determined using the length of piping from the 
regulator to the most remote outlet served by the 
regulator. [NFPA 54: 6.1.3] 

1217.2 Tables for Sizing Gas-Piping Systems. 

Tables 12-7 through 12-41 shall be used to size gas 
piping in conjunction with one of the methods 
described in Sections 1217.1.1 through 1217.1.3. 
[NFPA 54: 6.3] 

1217.3 Sizing Equations. The inside diameter of 
smooth-wall pipe or tubing shall be determined by 
the sizing equations 12-1 or 12-2/ using the 
equivalent pipe length determined by Sections 
1217.1.1 through 12117.1.3. [NFPA 54: 6.4] 



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168 



FUEL PIPING 



1217.3-1217.6 



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Equation 12-1 Low-Pressure Gas Formula (Less 
than 1.5 psi [10.3 kPa]): [NFPA 54: 6.4.1 



D= 



QO 



381 



19.17 



\Cr X L/ 



0.206 



where: 

D = inside diameter of pipe, inches 

Q = input rate appliance(s), cubic feet per hour at 
60°F (16°C) and 30-inch (759 mm) mercury 
coiumn 

?! = upstream pressure, psia (P^ + 14.7) 

P2 = downstream pressure, psia (P2 + 14.7) 

L = equivaient length of pipe, feet 

SH = pressure drop, inches water column (27.7 in. 
H20= Ipsi) 

Equation 12-2 High-Pressure Gas Formula (1.5 psi 

[10.3 kPa] and above): [NFPA 54: 6.4.2] 



D- 



Q 



i0.381 



18.93 Ml 



EPiizMiil 

1^ CrxL J 



0.206 



where: 

D = inside diameter of pipe, inches 

Q = input rate appliance(s), cubic feet per hour at 
60°F (16°C) and 30 inch (759 mm) mercury 
column 

Pj = upstream pressure, psia (Pj + 14.7) 

P2 - downstream pressure, psia (P2 + 14.7) 

L = equivalent length of pipe, feet. 

52H = pressure drop, inches water cohimn (27.7 in. 
H2O = 1 psi) 

TABLE 12-4 

Cr and Y for Natural Gas and Undiluted Propane 
at Standard Conditions [NFPA 54: Table 6.4.2] 



Formula Factors Gas 



Cr 



Nahiral Gas 0.6094 0.9992 

Undiluted Propane 1.2462 0.9910 

For SI units, 1 ft.^* = 0.028 m^; 1 ft. = 0.305 m; 1 in. 
water column = 0.249 l<Pa; 1 psi = 6.894 kPa; 1,000 
Btu/h = 0.293 kW. 

1217.4 To determine the size of each section of pipe 
in any system within the range of the Table, proceed 
as follow^s: 



(A) Measure the length of the pipe from the gas 
meter location to the most remote outlet on 
the system. 

(B) Select the length in feet column and row 
showing that distance, or the next longer 
distance if the table does not give the exact 
length. 

(C) Starting at the most remote outlet, find in the 
row just selected the gas demand for that 
outlet. If the exact figure of demand is not 
shown, choose the next larger figure in the 
row. 

(D) At the top of this column will be foim^d the 
correct size of pipe. 

(E) Using this same row, proceed in a similar 
manner for each section of pipe serving this 
outlet. For each section of pipe, determine 
the total gas demand supplied by that 
section. Where gas piping sections serve 
both heating and cooling equipment and the 
installation prevents both units from 
operating simultaneously, only the larg- 
er of the two demand loads needs be used in 
sizing these sections. 

(F) Size each section of branch piping not 
previously sized by measuring the distance 
from the gas meter location to the most 
remote outlet in that branch and follow the 
procedures of steps B, C, D, and E above. 

Note: 

Size branch piping in the order of their distance from 
the meter location, beginning with the most distant 
outlet not previously sized. 

1217.5 For conditions other than those covered by 
Section 1217.1, such as longer runs or greater gas 
demands, the size of each gas piping system shall be 
determined by standard engineering methods 
acceptable to the Authority Having Jurisdiction, and 
each such system shall be so designed that the total 
pressure drop between the meter or other point of 
supply and any outlet when full demand is being 
supplied to all outlets, will at no time exceed five- 
tenths (0.5) inches (12.7 mm) water column pressure. 

1217.6 Where the gas pressure may be higher than 
fourteen (14) inches (356 mm) or lower than six (6) 
inches (152 mm) of water column, or when diversity 
demand factors are used, the design, pipe, sizing, 
materials, location, and use of such systems first shall 
be approved by the Authority Having Jurisdiction. 
Piping systems designed for pressures higher than 
the serving gas supplier's standard delivery pressure 
shall have prior verification from the gas supplier of 
the availability of the design pressure. 



TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 



169 



Figure 1 2-2 Example 



UNIFORM PLUMBING CODE 



Figure 12-2 Example Illustrating Use of Tables 12-1 and 12-8 

Problem: Determine the required pipe size of each section and outlet of the piping system shown in Figure 12- 
2. Gas to be used has a specific gravity of sixty hundredths (0.60) and eleven hundred (1,100) Btu per cubic foot 
(11.4 Watt-hour/L), delivered at eight (8) inch (203 nm\) water column pressure. 



TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 
TIA 











150,000 btu/h 






* (43.950 W) 








1 f-umace 

1 






O 


1 






c 


/— ^ 






H 


o> 






r- 


^^ o« 






m 


3° 5l 






D 


LET 




Section 3 




i Section 2 Section 1 > 




20' 




1 10' 10' 




(6096 mm) 




^ (3048 mm).J3048 mmX ,_ 












J- 






O 




oS 






c 










H 




4^ 






f- 




°°o 




O 


— m 




3 - 
3 ■ 




c 

H 

f- 

m 


4!^ H_ 

<3 03* 


A 




H 


3 - 


W 




O 


3 


Gasr 


i/leter 






1 


r 



30 gallon (113.6 1) 

Automatic 
Water Heats' 



3 
3 



Gas 

Refrigerator 



Range 

Solution: 

(1) Maximum gas demand of outlet A — 

32 cubic feet per hour (0.21 L/sec.) (from Table 12-1). 
Maximum gas demand of outlet B — 

3 cubic feet per hour (0.02 L/sec.) (from Table 12-1). 
Maximum gas demand of outlet C — 

59 cubic feet per hour (0.46 L/sec.) (from Table 12-1). 
Maximum gas demand of outlet D — 

136 cubic feet per hour (1.1 L/sec.) (150,000 Bhi/hour [43,950 W]) 

divided by 1,100 Btu per cubic foot (11.4 Watt-hour/L) 

(2) The length of pipe from the gas meter to the most remote outlet (outlet A) is 60 feet (18,288 mm). 

(3) Using the length in feet column row marked 60 feet (18,288 mm) in Table 12-8: 

Outlet A, supplying 32 cubic feet per hour (0.21 L/sec), requires one-half (1/2) inch (15 mm) pipe. Section 

1, supplying outlets A and B, or 35 cubic feet per hour (0.24 L/sec.) requires one-half (1/2) inch (15 mm) 

pipe. 

Section 2, supplying outlets A, B, and C, or 94 cubic feet per hour (0.7 L/sec.) requires three-quarter (3/4) 

inch (20 mm) pipe. 

Section 3, supplying outlets A, B, C, and D, or 230 cubic feet per hour (1.8 L/sec), requires one inch (25 
mm) pipe. 

(4) Using the column marked 60 feet (18288 mm) in Table 12-8 (no column for actual length of 55 feet [16,764 
mm]: Outlet B supplying 3 cubic feet per hour (0.02 L/sec), requires one-half (1/2) inch (15 mm) pipe. 

Outlet C, supplying 59 cubic feet per hour (0.46 L/sec), requires one-half (1/2) inch (15 mm) pipe. 

(5) Using the column marked 50 feet (15,240 mm) in Table 12-8: 

Outlet D, supplying 136 cubic feet per hour (1.1 L/sec), requires (3/4) inch (20 mm) pipe. 



170 



FUEL PIPING 



Table 12-7 



Table 1 2-7 Schedule 40 Metallic Pipe [NFPA Table 6.2(a)] 

























Gas: 


Natural 




Inlet Pressure: 


Less than 2 


psi 




Pressure l^op: 


0.3 in. w.c. 




Specific Gravity: 


0.60 




Pipe Size (in.) 


Nominal: 


V4 


% 


1 


VA 


m 


2 


2V4 


3 


4 


5 


6 


8 


10 


12 


Actual ID: 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


5.047 


6.065 


7.981 


10.020 


11.938 


Leog^ (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


131 


273 


514 


1,060 


1,580 


3,050 


4,860 


8,580 


17,!>00 


31,700 


51..300 


105,000 


191,000 


303,000 


20 


90 


188 


363 


726 


1,090 


2.090 


3,340 


5,900 


12,000 


21,800 


35,300 


72,400 


132,000 


208,000 


30 


72 


151 


284 


583 


873 


1,680 


2,680 


4,740 


9,660 


17,500 


28,300 


.58,2(H) 


106,000 


167,0(X) 


40 


62 


129 


243 


499 


747 


1,410 


2.290 


4,0.50 


8,270 


15,0(H) 


24.200 


49,800 


90,4(M) 


143,000 


50 


55 


114 


215 


442 


662 


1,280 


2.030 


3,.590 


7,3.30 


13,300 


21,500 


44,100 


80,100 


127,000 


60 


50 


104 


195 


4<» 


(JOO 


1.160 


1,840 


3,260 


6,640 


12,000 


19,500 


40,0(M) 


72,600 


115.000 


70 


46 


95 


179 


368 


552 


1,060 


1,690 


3.000 


6,110 


11,100 


17,900 


36,800 


66.800 


106,000 


80 


42 


89 


167 


343 


514 


989 


1,580 


2,790 


5,680 


10,3(K) 


16,700 


34,200 


62 J (M) 


98,400 


90 


40 


83 


157 


322 


482 


928 


1,480 


2,610 


5,330 


9,6.50 


15,600 


32,100 


58,.300 


92,300 


100 


38 


79 


148 


30-4 


455 


877 


1,400 


2,470 


5,040 


9,110 


14,800 


30,.300 


55,100 


87,200 


125 


33 


70 


131 


2()9 


403 


777 


1,240 


2,190 


4,460 


8,080 


13,100 


26,900 


48,8(M) 


77,300 


150 


30 


63 


119 


244 


366 


704 


1,120 


1,980 


4.050 


7,320 


11,900 


24,300 


44.200 


70,000 


175 


28 


58 


109 


224 


336 


648 


1,030 


1,820 


3,720 


6,730 


10,900 


22,400 


40,700 


64,400 


200 


26 


54 


102 


209 


313 


602 


960 


1,700 


3,460 


6,260 


10,100 


20,800 


37,900 


59,900 


250 


23 


48 


90 


ia5 


til 


534 


851 


1,5(«) 


3,070 


5,5.50 


8,990 


]8,5(K) 


33,.5(K) 


53,100 


300 


21 


43 


82 


168 


251 


484 


771 


1,360 


2,780 


5,0.30 


8,1.50 


16,700 


30,400 


48,1(X) 


350 


1.9 


40 


75 


1,54 


231 


445 


709 


1.250 


2..560 


4,630 


7,490 


15.400 


28,0(H) 


44,-300 


400 


18 


37 


70 


143 


21.5 


414 


660 


1,170 


2,380 


4,310 


6,970 


14„300 


26,000 


41,200 


450 


17 


35 


66 


135 


202 


389 


619 


1,090 


2,2.30 


4,040 


6,540 


13,400 


24,400 


.38,600 


500 


16 


33 


62 


127 


191 


367 


385 


1,0.30 


2,110 


3,820 


6,180 


12,7(K) 


23,1(K) 


.36„500 


550 


15 


31 


.59 


121 


181 


349 


5.56 


982 


2,000 


3,620 


5,870 


12.100 


21,900 


34,700 


600 


14 


30 


.56 


115 


173 


333 


530 


937 


1.910 


3,460 


5,600 


11..5{K) 


20.900 


33,100 


6S0 


14 


29 


54 


110 


165 


318 


508 


897 


1,8.30 


3,310 


5,.360 


11,000 


20,000 


31,700 


700 


13 


27 


52 


106 


1,59 


306 


488 


862 


1,760 


3,180 


5,150 


10,600 


19,200 


30,400 


750 


13 


26 


60 


102 


1.53 


295 


470 


SSO 


1,690 


3,060 


4,960 


10,200 


18,500 


29,300 


8«) 


12 


26 


48 


99 


148 


285 


454 


802 


1,640 


2,960 


4,790 


9.840 


17.9(K> 


28,3(K) 


850 


12 


25 


46 


95 


143 


275 


439 


776 


1,580 


2,8fJ0 


4,640 


9,530 


17,-300 


27,400 


900 


11 


24 


45 


93 


139 


267 


426 


752 


1,530 


2,780 


4.500 


9,240 


16,800 


26,600 


950 


11 


23 


44 


90 


135 


259 


413 


731 


1,490 


2,700 


4,370 


8,970 


16,300 


25,800 


1,000 


11 


23 


43 


87 


131 


2.52 


402 


711 


1.450 


2,620 


4.250 


8,720 


15,800 


2.5,100 


1,100 


10 


21 


40 


83 


124 


240 


382 


675 


1,380 


2,490 


4,030 


8.290 


15.1(X) 


23,800 


1,200 


NA 


20 


39 


79 


119 


229 


364 


644 


1,310 


2,380 


3,850 


7,910 


14,4{M) 


22,700 


1,3(X) 


NA 


20 


37 


76 


114 


219 


349 


617 


1.260 


2,280 


3.680 


7,570 


13,700 


21,800 


1,400 


NA 


19 


35 


73 


109 


210 


335 


592 


1,210 


2,190 


3.540 


7,270 


13,200 


20,900 


1,500 


NA 


18 


34 


70 


105 


203 


323 


571 


1.160 


2,110 


3,410 


7,010 


12.700 


20,100 


1,600 


NA 


18 


33 


68 


102 


196 


312 


551 


1,120 


2,030 


3,290 


6.770 


12,300 


19,500 


1,700 


NA 


17 


32 


66 


98 


189 


302 


533 


l,Ot» 


1,970 


3.190 


6,550 


11,900 


18,800 


L8{H) 


NA 


16 


.31 


64 


95 


184 


293 


517 


1,050 


i,9U) 


3,090 


6,3.50 


J 1,. 5(H) 


i8„300 


1,900 


NA 


16 


30 


62 


93 


178 


284 


502 


1,020 


1,850 


3,000 


6,170 


11,200 


17,700 


2,000 


NA 


16 


29 


60 


90 


173 


276 


488 


1,000 


1,800 


2,920 


6,000 


10,900 


17,200 



NA means a flow of less than 10 cfli. 

Note: All table entries are rounded to 3 significant digits. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



171 



Table 12-8 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 12-8 Schedule 40 Metallic Pipe [NRPA Table 6.2(b)] 

























Cas: 


Natural 




Inlet Pressure; 


Less than 2 psi 




Pressure Drop: 


0.5 in. w.c. 




Specific Gravity! 


0.60 




Pipe Size (in.) 


Nominal: 


Vi 


V* 


1 


VA 


VA 


2 


VA 


3 


4 


5 


6 


8 


10 


12 


Actual ID: 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


5.047 


6.065 


7.981 


10.020 


11.938 


Length (ft) 


Capacity iti Cubic Feet of Gas per Hour 


HI 


172 


360 


678 


1,390 


2,090 


4.-,02O 


6,400 


11.300 


23,100 


4i,8(K> 


67,600 


139,000 


252,000 


39<),000 


20 


118 


247 


466 


957 


1,430 


2,7t)0 


4,400 


7,780 


15,900 


28,700 


46,.500 


95,.500 


173,000 


275,000 


30 


95 


109 


374 


768 


1,150 


2,220 


3.530 


6,250 


12,700 


23,0(X) 


37,300 


76,700 


139,000 


220,0(K) 


40 


81 


170 


320 


657 


985 


1,900 


3,020 


5,350 


10,900 


19,700 


31,900 


65,(500 


119,000 


189,0m) 


50 


72 


151 


284 


583 


873 


1,680 


2,f>80 


4.740 


9,660 


17,5W) 


28.300 


58,200 


106,000 


167,000 


60 


65 


137 


257 


528 


791 


1,520 


2,430 


4,290 


8,760 


15,800 


25.600 


52,700 


95,700 


152,000 


70 


60 


126 


237 


486 


728 


1,4(M) 


2,230 


3.950 


8.050 


14.6{K) 


23,600 


48,.500 


88,1 (K> 


139,0(K) 


80 


56 


117 


220 


452 


677 


1.300 


2,080 


3,670 


7,490 


13,600 


22,000 


45,100 


81,900 


130,000 


90 


52 


110 


207 


424 


635 


1,220 


1.950 


3,450 


7.030 


12,700 


20,600 


42,-300 


76,900 


122,0a) 


100 


50 


104 


195 


400 


600 


\,\m 


1,840 


3.260 


6,640 


12,000 


19,.500 


40.000 


72,600 


115,000 


125 


44 


92 


173 


355 


532 


1,020 


1,630 


2,890 


5,890 


10,600 


17,200 


35,400 


64,300 


102,000 


150 


40 


83 


157 


322 


482 


928 


1,480 


2,610 


5,330 


9,650 


15,600 


32,100 


■ 58,3«) 


92,300 


175 


.^7 


77 


144 


296 


443 


854 


1,360 


2.410 


4,910 


8,880 


14,400 


29,300 


53,600 


84,900 


200 


34 


71 


134 


275 


412 


794 


1,270 


2,240 


4,560 


8,260 


13,400 


27.500 


49,900 


79,000 


250 


30 


63 


119 


244 


366 


704 


1,120 


1,980 


4,050 


7,320 


11,900 


24,.300 


44,200 


70,000 


300 


27 


57 


108 


221 


331 


638 


1,020 


1,800 


3,670 


6,630 


10,700 


22,100 


40,100 


63,400 


350 


25 


53 


99 


203 


305 


587 


935 


1,650 


3,370 


6.100 


9,880 


20,300 


36,900 


58,400 


400 


23 


49 


92 


189 


283 


546 


870 


1,540 


3,140 


3,680 


9,190 


18,900 


34.300 


54.300 


450 


22 


46 


86 


177 


266 


512 


816 


1,440 


2,940 


5,330 


8,620 


17,700 


32,200 


50,900 


300 


21 


43 


82 


168 


251 


484 


771 


1,360 


2,780 


5,030 


8,150 


16,700 


30,400 


48,100 


550 


20 


41 


78 


159 


239 


4.59 


732 


1,290 


2.640 


4,780 


7,740 


15,!K)0 


28,900 


45,700 


(WO 


19 


39 


74 


152 


228 


438 


699 


1,240 


2,520 


4,5«) 


7,380 


15,200 


27,5(K) 


43,600 


650 


18 


.38 


71 


145 


218 


420 


669 


1,180 


2,410 


4,360 


7,070 


14, .500 


26,400 


41,800 


700 


17 


36 


68 


140 


209 


403 


(rlS 


1,140 


2,320 


4, UK) 


6,790 


14,(X)0 


25,300 


40,1 (K) 


750 


17 


35 


66 


135 


202 


389 


619 


1,090 


2,230 


4,040 


6,540 


13,400 


24,400 


38,600 


800 


16 


34 


63 


130 


195 


375 


598 


1,060 


2,160 


3,900 


6,320 


13,000 


23,600 


37,3(K) 


850 


16 


33 


61 


126 


189 


363 


579 


1.020 


2,090 


3,780 


6,110 


12,iJ00 


22.800 


36,100 


900 


15 


32 


.59 


122 


183 


.352 


561 


992 


2,020 


3,660 


5,930 


12,200 


22,100 


35,000 


050 


15 


31 


58 


118 


178 


342 


545 


963 


1,960 


3,550 


5,760 


11,800 


21,500 


34,000 


1,(X(0 


1,4 


30 


56 


115 


173 


333 


530 


937 


1,910 


3,460 


3,600 


11, .500 


20,900 


33,100 


1,100 


14 


28 


53 


109 


164 


316 


503 


890 


1,810 


3,280 


5,320 


10,900 


19,8(K) 


3I,4(X) 


1,200 


13 


27 


51 


104 


156 


301 


480 


849 


1,730 


3,130 


5,070 


10,400 


18,000 


30,000 


1,300 


12 


26 


49 


100 


150 


289 


460 


813 


l,6(i0 


3,000 


4,8(>0 


9,980 


18,100 


28,7a) 


1,400 


12 


25 


47 


96 


144 


277 


442 


781 


1..590 


2,880 


4,670 


9,.590 


17,400 


27,600 


1,500 


11 


24 


45 


93 


139 


267 


426 


752 


1,530 


2,780 


4,500 


9,240 


16,800 


26,600 


1,600 


11 


23 


44 


89 


134 


258 


411 


727 


1,480 


2,680 


4.340 


8,920 


16,200 


25.6(M) 


1,700 


11 


22 


42 


86 


130 


250 


398 


703 


1,430 


2,590 


4.200 


8,630 


15,700 


24,800 


1,800 


10 


22 


41 


84 


126 


242 


386 


682 


1,390 


2,520 


4,070 


8,370 


15,200 


24.100 


1 ,«)0 


10 


21 


40 


81 


122 


235 


375 


662 


1,350 


2,440 


3,960 


8,1.30 


14,S*K) 


23,400 


2,000 


NA 


20 


39 


79 


119 


229 


364 


644 


1,310 


2,380 


3,850 


7,910 


14,4(K) 


22,700 



NA means a flow of less than 10 cfli. 

Note: All table entries are rounded to .S .significant digits. 



172 



FUEL PIPING 



Table 12-9 



Table 12-9 Schedule 40 MetaUic Pipe [NFPA Table 6.2(c)] 















Gas: 


Natural 




inlet PressMiie: 


2.0 psi 




Pressure Drop: 


1.0 psi 




Specific Gmvi^ 


0,60 




Pipe Size (in.) 


Nominal: 


«/4 


% 


1 


l'/4 


VA 


2 


V/k 


3 


4 


Actual ID: 


0.622 


0.824 


1.049 


1.3S0 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 








Capacity in 


Cubic Feet of Gas per Hour 








10 


1,510 


3.040 


5,560 


11,400 


17,100 


32,9«) 


52,500 


92,800 


189,(M)0 


20 


1,070 


2,150 


3,930 


8,070 


12,100 


23,300 


37,1,00 


65,600 


134,000 


30 


869 


1.760 


3,210 


6„590 


9,880 


19,000 


30,300 


53,600 


109.000 


40 


753 


1,520 


2,780 


.5,710 


8,550 


16,.500 


26,300 


46,400 


94,700 


50 


673 


1,860 


2,4<Ki 


5,110 


7,650 


■ 14,700 


23,5(X) 


41„500 


84,700 


60 


615 


1,24« 


2,270 


4,660 


6,980 


13,!500 


21,400 


37.900 


77.300 


-70 


569 


1,150 


2,100 


4,320 • 


6,470 


12,500 


19,900 


35,100 


71,600 


80 


532 


1,080 


1,970 


■ 4,040 


6,050 


11,700 


18,600 


32,800 


67.000 


90 


502 


1,010 


1,850 


3,810 


5.700 


11.000 


17,500 


30,900 


63,100 


100 


, 462 


934 


1,710 


3,510 


5,260 


10.100 


16,100 


28,500 


58,200 


125 


414 


836 


1,530 


3,140 


4,7tX» 


9,060 


14,400 


25,500 


r.2,100 


150 


372 


751 


1,370 


2,820 


4,220 


8,130 


13,000 


22,900 


46,700 


175 


344 


695 


1,270 


2.601 


3,910 


7,530 


12,000 


21,200 


43,300 


200 


318 


642 


1,170 


2,410 


3,610 


6.960 


11.100 


19,600 


40,000 


250 


279 


583 


1,040 


2,140 


.3,210 


6,180 


9,850 


17,400 


35.500 


300 


253 


.528 


945 


1,94:0 


2,910 


b,m) 


8,920 


15,800 


32,200 


350 


232 


486 


869 


1.790 


2.670 


5,1.50 


8,210 


14.500 


29,600 


400 


216 


452 


809 


1,660 


2,490 


4,790 


7,640 


13,500 


27,500 


450 


203 


424 


759 


1,560 


2,330 


4,500 


7,170 


12,700 


25,800 


500 


192 


401 


717 


1,470 


2,210 


4,250 


6,770 


12,000 


24,400 


550 


182 


381 


681 


1,400 


2,090 - 


4,030 


6,430 


11.400 


23,200 


600 


174 


3()3 


6.50 


1,.330 


2,000 


3,8.50 


6.130 


10,800 


22,100 


650 


166 


348 


622 


1.280 


1,910 


3.680 


5,870 


10,400 


21,200 


700 


160 


334 


598 


1,2.30 


1,840 


3,54« 


5,640 


9,970 


20,300 


750 


154 


322 


576 


1,180 


1.770 


3,410 


5,440 


9,610 


19,600 


800 


149 


311 


556 


1,140 


1,710 


3,290 


5,2>)0 


9,280 


18,900 


850 


144 


.301 


5.38 


1,100 


1,650 


3,190 


5,080 


8,980 


18,300 


900 


139 


292 


522 


1,070 


1,600 


3,090 


4,930 


8,710 


17,800 


950 


135 


283 


507 


1,040 


1,560 


3,000 


4,780 


8,460 


17.200 


1,000 


132 


275 


493 


1,010 


1,520 


2,920 


4,6.50 


8,220 


16.800 


1,100 


125 


262 


468 


960 


1,440 


2,770 


4,420 


7,810 


15,900 


1.200 


119 


250 


446 


917 


1,370 


2,640 


4,220 


7.450 


15,200 


1,300 


114 


2-39 


427 


878 


1,320 


2,5,30 


4,040 


7,140 


14,600 


1,400 


110 


2.30 


411 


843 


1.260 


2,430 


3.880 


6,860 


14,000 


1,500 


106 


221 


396 


812 


1,220 


2,34.0 


3,740 


6,600 


13,500 


1,600 


102 


214 


382 


784 


1,180 


2,260 


3,610 


6,380 


13,000 


1,700 


99 


207 


370 


7.59 


1,140 


2,190 


3,490 


6,170 


12,600 


1,800 


96 


200 


358 


736 


l.KM) 


2.120 


3,390 


5,980 


12,200 


1,9<M) 


93 


193 


348 


715 


1,070 


2,060 


3,290 


5,810 


11,900 


2,000 


91 


189 


339 


695 


1,040 


2.010 


3,200 


5,650 


11, .500 



Note: All Uible entries are rounded to 3 significant digits. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



173 



Table 12-10 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 1 2-1 Schedule 40 MetaUic Pipe [NFPA Table 6.2(d)] 















Gas: 


Natural 




Inlet Pressure: 


3.0 psi 




Pressure Drop: 


2.0 psi 




Specific Gravity: 


0.60 




Pipe Size (in.) 


Nominal: 


H 


»/4 


I 


VA 


IH 


2 


2M. 


3 


4 


Actual ID: 


0.622 


0.824 


1.049 


1,380 


1,610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 








Capacity in 


Cubic Feet of Gas per Hour 








10 


2„%0 


4.920 


9.270 


19,000 


28,500 


54,900 


87,500 


155.000 


316,000 


20 


1,620 


3,380 


6,370 


13,100 


19,600 


37,700 


60,100 


106,000 


217,000 


30 


1300 


2,720 


5,1 10 


10,500 


15,700 


30,300 


48,300 


85,400 


174,000 


40 


1,110 


2,320 


4,380 


8,9i»0 


13,500 


25,900 


41,3(X) 


73,100 


149,000 


50 


985 


2,060 


3,880 


7,970 


11,900 


23,000 


36,6(K) 


64,800 


132,000 


60 


892 


1,870 


3,520 


7,220 


10,800 


20,800 


33,200 


58,700 


120,000 


70 


821 


1,720 


3,230 


6,640 


9,950 


19,200 


30,500 


54,000 


110,000 


80 


764 


1,600 


3,010 


6,180 


9,260 


17,800 


28,400 


50.200 


102,000 


90 


717 


1,500 


2.820 


5,800 


8,680 


16,700 


26,700 


47,100 


96,100 


100 


677 


1,420 


2,670 


5,470 


8,200 


15,800 


25,200 


44,500 


90,800 


125 


600 


1,250 


2,360 


4,850 


7,270 


14,000 


22,300 


39,500 


80,500 


150 


.544 


l.HO 


2,140 


4,400 


6,590 


12,700 


20,200 


35.700 


72,900 


175 


,500 


1.050 


1,970 


4,040 


6,060 


11,700 


18,600 


32,900 


67,100 


200 


465 


973 


1,830 


3,760 


5,640 


10,900 


17,300 


30,600 


62,400 


250 


412 


862 


1,620 


3,330 


5,000 


9,620 


15.300 


27.100 


55,300 


soo 


,H74 


781 


1,470 


3,020 


4,530 


8,720 


13,900 


24,0)00 


.50.100 


350 


344 


719 


1,.350 


2,780 


4,170 


8,020 


12,800 


22,600 


46,100 


400 


,^20 


(>69 


1,260 


2,590 


3,870 


7,460 


11,900 


21,000 


42,900 


450 


300 


627 


1.180 


2,430 


3,640 


7,000 


11,200 


19.700 


40,200 


500 


283 


593 


1,120 


2,290 


3,430 


6,610 


10,500 


18,600 


38,000 


550 


269 


563 


1,060 


2,180 


3,260 


6,280 


10.000 


17,700 


.36,100 


600 


257 


537. 


1,010 


2,080 


3,110 


5,990 


9,550 


16,900 


34,400 


S50 


246 


514 


969 


1,990 


2,980 


5,740 


9,1,50 


16.200 


33,000 


700 


236 


494 


931 


1,910 


2,860 


5,510 


8,790 


15,.500 


31,700 


750 


228 


476 


897 


1,840 


2,760 


.5,310 


8,470 


15,000 


30,500 


800 


220 


460 


866 


1,780 


2,660 


5,130 


8,180 


14,500 


29,500 


850 


213 


445 


838 


1,720 


2,580 


4,960 


7.910 


14,000 


28,500 


900 


206 


431 


812 


1,670 


2,500 


4,810 


7,670 


13,600 


27,700 


950 


200 


419 


789 


1,620 


2,430 


4,670 


7,450 


13,200 


26,900 


1,000 


195 


407 


767 


1,580 


2,360 


4,5.50 


7,240 


12,800 


26,100 


1,100 


.185 


387 


729 


1,600 


2,240 


4,320 


6,890 


12,200 


24.800 


1,200 


177 


369 


695 


1,430 


2,140 


4,120 


6,570 


11,600 


2.3,700 


I, .WO 


169 


353 


666 


1,370 


2.050 


3,940 


(j,290 


11,100 


22,700 


1,400 


162 


340 


640 


1,310 


1,970 


3,790 


6,040 


10,700 


21,8<.i0 


1,500 


166 


327 


616 


1.270 


1,900 


3,650 


5,820 


10,.300 


21,000 


1,()00 


151 


316 


595 


1,220 


1,830 


3,530 


5,620 


10,000 


20,300 


1,700 


146 


306 


576 


1,180 


1.770 


3,410 


5,440 


9,610 


19,600 


1,800 


142 


296 


558 


1,150 


1,720 


3,310 


5.270 


9,320 


19,000 


1,900 


138 


288 


542 


1.110 


1,670 


3,210 


5,120 


9,050 


18,400 


2,000 


1,34 


280 


527 


1,080 


1,620 


3,120 


4.980 


8,800 


18.000 



Note: All table entries are rounded to 3 significant digits. 



174 



FUEL PIPING 



Table 12-11 



Table 12-11 Schedule 40 MetalUc Pipe [NFPA Table 6.2 (e)] 















Gas: 


Natural 




Inlet Pressure: 


5.0 psi 




Pressure Drop: 


3.5 psi 




Specific Gravifys 


0.60 




Pipe Size (in.) 


Nominal: 


'/4 


V4 


1 


VA 


m 


2 


2Mi 


3 


4 


Actual ID: 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 








Capacity in 


Cubic Feet of Gas per Hour 








10 


3,190 


6,430 


11,800 


24,200 


36,200 


69,700 


111.000 


196,000 


401,000 


20 


2,250 


4,550 


8,320 


17,100 


25,600 


49,300 


78.600 


139,000 


283,000 


30 


1,840 


3,720 


6,790 


14,000 


20,900 


40,300 


64,200 


113.000 


231,000 


40 


1,590 


3,220 


3,880 


12,100 


18,100 


34,900 


53,600 


98.200 


200,000 


50 


1,430 


2,880 


5,260 


10,800 


16,200 


31,200 


49,700 


87,900 


179,000 


60 


1,300 


2,630 


4,800 


9,860 


14,800 


28,500 


45,400 


80,200 


164,000 


70 


1,200 


2,430 


4,450 


9,130 


13,700 


26,400 


42,000 


74,300 


151,000 


80 


1,150 


2,330 


4,260 


8.540 


12,800 


24,700 


.39,300 


69,.500 


142,000 


90 


1,060 


2,150 


3,920 


8,050 


12,100 


23,200 


37.000 


65,500 


134,000 


100 


979 


1,980 


3,620 


7,4.30 


11,100 


21,400 


34.200 


60,400 


123,000 


125 


876 


1.770 


3,240 


6,640 


9,950 


19,200 


.30,600 


54,000 


110,000 


150 


786 


im) 


2,910 


.5,960 


8,940 


17,200 


27,400 


48,500 


98,900 


175 


728 


1,470 


2,690 


5,520 


8,270 


15,900 


25,400 


44,900 


91,600 


200 


673 


1,360 


2,490 


5,100 


7,650 


14,700 


23..500 


41,500 


84,700 


250 


558 


1,170 


2,200 


4.510 


6,760 


13,000 


20,800 


36,700 


74,900 


300 


506 


i.om 


1,990 


4,090 


6,130 


11,800 


18,800 


.33,300 


67,800 


350 


465 


973 


1,830 


3,760 


5,640 


10,900 


17,300 


.30,600 


62,400 


400 


433 


905 


1,710 


3„500 


5,250 


10,100 


16,1(K) 


28,500 


58,100 


450 


406 


849 


1,600 


3,290 


4,920 


9.480 


15,100 


26,700 


54 ,.500 


500 


384 


802 


1,510 


.3,100 


4,650 


8.950 


14,300 


25,200 


51,.tO0 


550 


364 


762 


1.440 


2,950 


4,420 


8,500 


13,600 


24,000 


48,900 


600 


348 


727 


1.370 


2,810 


4,210 


8,110 


12,900 


22,900 


46,600 


650 


333 


696 


1,310 


2,690 


4,030 


7,770 


12,400 


21,900 


44,600 


700 


320 


669 


1,260 


2„590 


3,880 


7.460 


11,900 


21,000 


42,900 


750 


308 


644 


1,210 


2,490 


3,730 


7,190 


11,5(K) 


20,300 


41,300 


800 


298 


622 


1,170 


2,410 


3,610 


6,940 


11.100 


19,600 


39,900 


850 


288 


602 


1,130 


2,330 


3,490 


6,720 


10,700 


18,900 


38,600 


900 


279 


584 


1,100 


2,260 


3,380 


6,320 


10.400 


18,400 


37,400 


950 


271 


567 


1.070 


2,190 


3,290 


6,330 


10.100 


17,800 


36,400 


1,000 


264 . 


551 


1,040 


2,130 


3,200 


6,150 


9.810 


17,300 


35,400 


1,100 


250 


524 


987 


2,030 


3,030 


5.840 


9.320 


16„500 


33,600 


1,200 


239 


500 


941 


1,930 


2,900 


5,580 


8,890 


15,700 


32,000 


1.300 


229 


478 


901 


1,850 


2,770 


5,340 


8,510 


15,000 


30,700 


1.400 


220 


460 


866 


1,780 


2,660 


5,1.30 


8,180 


14,500 


29,500 


1,500 


212 


443 


834 


1,710 


2,570 


4,940 


7.880 


]3,900 


28.400 


1,600 


205 


428 


806 


1,650 


2,480 


4,770 


7.610 


13,400 


27,400 


1,700 


198 


414 


780 


1,600 


2,400 


4,620 


7,360 


13,000 


26,500 


1,800 


192 


401 


756 


1,550 


2,330 


4,480 


7,140 


12,600 


25,700 


1,900 


186 


390 


734 


1,510 


2.260 


4.3-50 


6,930 


12,300 


25.000 


2.000 


181 


379 


714 


1,470 


2,200 


4,230 


6,740 


11,900 


24,300 



Note: All table entries itre rounded to 3 significant digits. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



175 



Table 12-12 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 12-12 Semi-Rigid Copper Tubing [NFPA Table 6.2(f)] 



















Gas: 


Natural 




Inlet Pressure: 


Less than 2 psi 




Pressure Drop: 


0.3 in. w.c. 




Specific Gravity: 


0.60 




Tube Size (in.) 




K&JU 


W 


% 


'At 


% 


% 


1 


VA 


l¥i 


2 


























ACR: 


% 


'/a 


¥» 


¥* 


% 


!'/» 


1% 


— 


— 


Outside: 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside:* 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


20 


42 


85 


148 


210 


448 


806 


1,270 


2,650 


20 


14 


29 


58 


102 


144 


308 


554 


873 


1,820 


30 


11 


23 


47 


82 


116 


247 


445 


701 


1,460 


40 


10 


20 


40 


70 


99 


211 


381 


600 


1,250 


50 


NA. 


17 


35 


62 


88 


187 


.337 


532 


1,110 


60 


NA 


16 


32 


56 


79 


170 


306 


482 


1,000 


70 


NA 


14 


2<) 


52 


73 


156 


281 


443 


924 


80 


NA 


13 


27 


48 


68 


145 


262 


413 


859 


90 


NA 


13 


26 


45 


64 


J 36 


245 


387 


806 


100 


NA 


12 


24 


43 


60 


129 


232 


366 


761 


125 


NA 


11 


22 


38 


53 


114 


206 


324 


675 


150 


NA 


10 


20 


34 


48 


103 


186 


294 


612 


175 


NA 


NA 


18 


31 


45 


95 


171 


270 


563 


200 


NA 


. NA 


17 


29 


41 


89 


159 


251 


523 


250 


NA 


NA 


15 


26 


37 


78 


141 


223 


464 


300 


NA 


NA 


13 


23 


33 


71 


128 


202 


420 


SSO 


NA 


NA 


12 


22 


31 


65 


118 


186 


387 


400 


NA 


NA 


11 


20 


28 


61 


110 


173 


360 


450 


NA 


NA 


11 


19 


27 


57 


103 


162 


338 


500 


NA 


NA 


10 


18 


25 


54 


97 


153 


319 


550 


NA 


NA 


NA 


17 


24 


51 


92 


145 


303 


(iOO 


NA 


NA 


NA 


16 


23 


49 


88 


139 


289 


(■(50 


NA 


NA 


NA 


15 


22 


47 


84 


133 


277' 


700 


NA 


NA 


NA 


16 


21 


45 


81 


128 


266 


750 


NA 


NA 


NA 


14 


20 


43 


78 


123 


256 


800 


NA 


NA 


NA 


14 


20 


42 


75 


119 


247 


850 


NA 


NA 


NA 


13 


19 


4,0 


73 


115 


239 


900 


NA 


NA 


.NA 


13 


18 


39 


71 


111 


232 


950 


NA 


NA 


NA 


13 


18 


38 


69 


108 


225 


1,000 


NA 


NA 


NA 


12 


17 


37 


67 


105 


219 


1,100 


NA 


NA 


NA 


12 


16 


35 


63 


100 


208 


1,200 


NA 


NA 


NA 


11 


16 


34 


60 


95 


199 


1,300 


NA 


NA 


NA 


11 


15 


32 


58 


91 


190 


1,400 


NA 


NA 


NA 


10 


14 


31 


56 


88 


183 


1,500 


NA 


NA 


NA 


NA 


14 


30 


54 


84 


176 


1,600 


NA 


NA 


NA 


NA 


13 


29 


52 


82 


170 


1,700 


NA 


NA 


NA 


NA 


13 


28 


50 


79 


164 


1,800 


NA 


NA 


NA 


NA 


13 


27 


49 


77 


159 


1,900 


NA 


NA 


NA 


NA 


12 


26 


47 


74 


155 


2,(XI0 


NA 


NA 


NA 


NA 


12 


25 


46 


72 


151 



NA means a flow of less than 10 cfli. 

Note: .A.11 table emries are rounded to 3 significant, digits. 

'Table capacities are based on T)pe K copper tubing inside diameter (shov\ni) , which has the smallest inside 

diameter of tJie copper tubing products. 



176 



FUEL PIPING 



Table 12-13 



Table 1 2-1 3 Semi-Rigid Copper Tubing [NFPA Table 6.2(g)] 

















Gas: 


Natui'al 




Inlet Pressure: 


I.«$s than 2 psi 




Presjsure Drop: 


O.S in. w.c, 




Spedific Gravity: 


0.60 




Tube Size (in.) 




KScU 


'/4 


% 


¥i 


% 


% 


1 


VA 


VA 


2 


Nominal: 
























ACR: 


% 


H 


% 


% 


% 


11/8 


1% 


— 


— 


Outside: 


0.375 


0.500 


0.625 


0.750 


0.875 


1,125 


1.375 


1.625 


2.125 


Inside:' 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 








Capacity in 


dubic Feet of Gas per Hour 






10 


27 


55 


Hi 


195 


276 


590 


1,060 


1,680 


3,490 


20 


18 


38 


77 


134 


190 


406 


730 


1,150 


2,400 


30 


15 


30 


61 


107 


152 


.326 


586 


925 


1.9.30 


•10 


13 


26 


53 


92 


131 


279 


502 


791 


1,650 


50 


11 


23 


47 


82 


116 


247 


445 


701 


1,460 


60 


10 


21 


42 


74 


105 


224 


403 


635 


1,.320 


70 


NA 


19 


39 


68 


96 


206 


371 


585 


1,220 


80 


.NA 


18 


36 


63 


90 


192 


,345 


544 


1,130 


90 


NA 


17 


M 


59 


84 


180 


324 


510 


1,060 


100 


NA 


16 


32 


55 


79 


170 


306 . 


482 


1,000 


125 


NA 


14 


28 


50 


70 


151 


271 


427 


890 


150 


NA 


13 


26 


45 


64 


136 


245 


387 


806 


175 


NA 


12 


24 


41 


59 


126 


226 


.356 


742 


200 


NA 


11 


22 


39 


55 


117 


210 


331 


690 


250 


NA 


NA 


20 


34 


48 


103 


186 


294 


612 


300 


NA 


NA 


18 


31 


44 


94 


169 


266 


.554 


350 


NA 


NA 


16 


28 


40 


86 


155 


245 


510 


400 


NA 


NA 


15 


26 


38 


80 


144 


228 


474 


450 


. NA 


NA 


14 


25 


35 


75 


135 


214 


445 


500 


NA 


NA 


13 


23 


33 


71 


128 


202 


420 


550 


NA 


NA 


13 


22 


32 


68 


122 


192 


399 


600 


NA 


NA 


12 


21 


30 


64 


116 


183 


381 


650 


NA 


NA 


12 


20 


29 


62 


111 


175 


365 


700 


NA 


NA 


11 


20 


28 


59 


107 


168 


350 


750 


NA 


NA 


11 


19 


27 


57 


103 


162 


338 


80C> 


NA 


NA 


10 


IS 


26 


55 


99 


1.56 


.326 


850 


NA 


NA 


10 


18 


25 


5.3 


96 


151 


315 


9m 


NA 


NA 


NA 


17 


24 


52 


93 


147 


306 


950 


NA 


NA 


.NA 


17 


24 


.50 


90 


143 


297 


l.WM) 


NA 


NA 


NA 


16 


23 


49 


88 


139 


289 


1,100 


NA 


NA 


NA 


15 


22 


46 


84 


132 


274 


1,200 


NA 


.\'A 


NA 


15 


21 


44 


80 


126 


262 


1,300 


NA 


NA 


NA 


14 


20 


42 


76 


120 


251 


U(m 


NA 


NA 


NA 


13 


19 


41 


73 


116 


241 


1,500 


NA 


> NA 


NA 


13 


18 


.39 


71 


111 


232 


1,600 


NA 


NA 


NA 


13 


18 


38 


68 


108 


224 


1,700 


NA 


NA 


NA 


12 


17 


37 


66 


104 


217 


1.800 


NA 


.NA 


NA 


12 


17 


36 


64 


101 


210 


1,900 


NA 


NA 


NA 


11 


16 


35 


62 


98 


204 


2,000 


NA 


NA 


NA 


11 


16 


34 


60 


95 


199 



NA means a flow of less than 10 dli. 

Note: All table entries are rotmded to 3 significant digits. 

'Table capacities are based on Type K. copper tubing inside diameter (shown) , which has the smallest inside 

diameter of the copper tubing products. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



177 



Table 12-14 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA. 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 12-14 Semi-Rigid Copper Tubing [NBPA Table 6.2(h)] 



Gas: Natural 



Met Pressure: 



Pressure Drop: 



Specific Gravity: 



Less than 2 psi 



1.0 in. W.C. 



0.60 



SPi-.CIAI. L'Sr.: Tube Si/ing lictwccn Mou.sc Line Re(<;iilator and the Appliance. 



Tube Size (in.) 





K&L: 


W 


% 


^A 


% 


% 


1 


VA 


I'A 


2 


























ACR: 


% 


14 


% 


% 


% 


IVs 


1% 


— 


— 


Outside: 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside:* 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


.39 


80 


162 


283 


402 


859 


1,.550 


2.440 


5.080 


20 


27 


53 


111 


195 


276 


590 


1,060 


1,680 


3,490 


30 


21 


44 


89 


156 


222 


474 


853 


1,350 


2,800 


40 


18 


38 


77 


134 


190 


406 


730 


1,1.50 


2,400 


50 


16 


33 


68 


119 


168 


359 


647 


1,020 


2,1-30 


60 


15 


30 


61 


107 


152 


326 


586 


925 


1.930 


70 


13 


28 


57 


99 


140 


300 


539 


851 


1,770 


80 


13 


26 


53 


92 


131 


279 


502 


791 


1,650 


90 


12 


24 


49 


86 


122 


262 


471 


742 


1,550 


JOO 


IJ 


23 


47 


82 


116 


247 


445 


701 


1,460 


125 


NA 


20 


41 


72 


103 


219 


394 


622 


1,290 


J50 


.NiA 


18 


37 


65 


93 


198 


357 


563 


1,170 


175 


NA 


17 


34 


60 


85 


183 


329 


518 


1,080 


200 


NA 


16 


32 


56 


79 


170 


306 


482 


1,000 


250 


NA 


14 


28 


50 


70 


151 


271 


427 


890 


300 


NA 


13 


26 


45 


64 


136 


245 


387 


806 


350 


NA 


12 


24 


41 


59 


125 


226 


356 


742 


400 


NA 


11 


22 


39 


55 


117 


210 


331 


690 


450 


NA 


10 


21 


36 


51 


110 


197 


311 


647 


500 


.NiA 


NA 


20 


34 


48 


103 


186 


294 


612 


530 


NA 


NA 


19 


32 


46 


98 


177 


279 


581 


600 


NA 


NA 


18 


31 


44 


94 


169 


266 


554 


630 


NA 


NA 


17 


30 


42 


90 


162 


255 


531 


700 


NA 


NA 


16 


28 


40 


86 


L55 


245 


510 


750 


NA 


NA 


16 


27 


39 


83 


150 


236 


491 


800 


NA 


NA 


15 


26 


38 


80 


144 


228 


474. 


8.50 


•N'A 


NA 


15 


26 


36 


78 


140 


. 220 


459 


900 


NA 


NA 


14 


25 


35 


75 


135 


214 


445 


950 


NA 


NA 


14 


24 


34 


73 


132 


207 


432 


1,000 


.NA 


NA 


13 


23 


33 


71 


128 


202 


420 


l,i00 


NA 


NA 


13 


22 


32 


68 


122 


192 


399 


1,200 


.NA 


NA 


12 


21 


30 


64 


116 


183 


381 


1,SOO 


NA 


NA 


12 


20 


29 


62 


111 


175 


365 


J, 400 


NA 


NA 


11 


20 


28 


.59 


107 


168 


3.50 


1,500 


NA 


NA 


11 


19 


27 


57 


103 


162 


338 


1,600 


.N'A 


.NA 


10 


18 


26 


55 


99 


156 


326 


1,700 


NA 


NA 


10 


18 


25 


53 


96 


151 


315 


1,8(K) 


NA 


NA 


NA 


17 


24 


52 


93 


147 


306 


1,900 


NA 


.NA 


NA 


17 


24 


50 


90 


143 


297 


2,000 


NA 


NA 


NA 


16 


23 


49 


88 


1.39 


289 



NA means a flow of less than 10 cfli. 

Note: All table entries are rounded to 3 significant digits. 

"Table capacities are based on Type K copper tubing inside diameter (.shtnvn), which has the smallest inside 

diameter of the copper tubing products. 



178 



FUEL PIPING 



Table 12-15 



Table 12-15 Semi-Rigid Copper Tubing [NFPA Table 6.2(i)] 

















Gas: 


Natural 




Inlet Pressure: 


Less tlian 2.0 psi 




Pressure Drop: 


17.0in. w.c. 




Specific Gravity: 


0.60 




Tube Size (in.) 


Noxniiial: 


K&L: 


V* 


% 


V4 


% 


y« 


\ 


VA 


m 


2 
























ACR: 


% 


>/4 


% 


% 


% 


IMt 


1% 


— 


— 


Outside: 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside:* 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


190 


391 


796 


1,390 


1.970 


4,220 


7,590 


12,000 


24.900 


20 


130 


269 


547 


956 


1,360 


2,900 


5,220 


8,230 


17,100 


30 


105 


216 


439 


768 


1,090 


2,330 


4.190 


6,610 


13,800 


40 


90 


185 


376 


657 


932 


1,990 


3,590 


5,630 


11,800 


50 


79 


164 


333 


582 


826 


1,770 


3,180 


5,010 


10,400 


60 


72 


148 


302 


528 


749 


1,600 


2,880 


4,540 


9,460 


70 


66 


137 


278 


486 


689 


1,470 


2,650 


4,180 


8,700 


80 


62 


127 


258 


452 


641 


1,370 


2,460 


3,890 


8,090 


90 


58 


119 


243 


424 


601 


1,280 


2,310 


3,650 


7,590 


100 


55 


113 


229 


400 


568 


1,210 


2,180 


3,44(J 


7.170 


123 


48 


100 


203 


355 


503 


1,080 


1,940 


3,050 


6,360 


150 


44 


90 


184 


321 


4.56 


974 


1,750 


2,770 


5,760 


175 


40 


83 


169 


296 


420 


896 


1,610 


2,540 


5,300 


200 


38 


77 


157 


275 


390 


834 


1,500 


2,370 


4,930 


250 


33 


69 


140 


244 


346 


739 


1,330 


2,100 


4,370 


300 


30 


62 


126 


221 


313 


670 


1,210 


1,900 


3,960 


350 


28 


57 


116 


203 


288 


616 


1,110 


1,750 


3,640 


400 


26 


53 


108 


189 


268 


573 


1,030 


1,630 


3,390 


450 


24 


50 


102 


177 


252 


538 


968 


1,530 


3,180 


500 


23 


47 


96 


168 


238 


508 


914 


1,440 


3,000 


550 


22 


45 


91 


159 


226 


482 


868 


1,370 


2.850 


600 


21 


43 


87 


152 


215 


460 


829 


1,310 


2,720 


650 


20 


41 


83 


145 


206 


441 


793 


1,2.50 


2,610 


700 


19 


39 


80 


140 


198 


423 


762 


1,200 


2,500 


750 


18 


38 


77 


135 


191 


408 


734 


1,160 


2,410 


800 


18 


37 


74 


130 


184 


394 


709 


1,120 


2,330 


850 


17 


33 


72 


126 


178 


381 


686 


1,080 


2,250 


900 


17 


34 


70 


122 


173 


370 


665 


1,050 


2,180 


950 


16 


33 


68 


118 


168 


359 


646 


1,020 


2,120 


1,000 


16 


32 


66 


115 


163 


349 


628 


991 


2,060 


1,100 


15 


31 


63 


109 


155 


832 


397 


941 


1,960 


1,200 


14 


29 


60 


104 


148 


316 


569 


898 


1.870 


1,300 


14 


28 


57 


100 


142 


303 


545 


8m 


1,790 


1,400 


13 


27 


35 


96. 


136 


291 


524 


826 


1,720 


1,500 


13 


26 


53 


93 


131 


280 


505 


796 


1,660 


1,600 


12 


25 


51 


89 


127 


271 


487 


768 


1,600 


1.700 


12 


24 


49 


86 


123 


262 


472 


744 


1,550 


1,800 


11 


24 


48 


84 


119 


254 


457 


721 


1,500 


1,900 


11 


23 


47 


81 


115 


247 


444 


700 


1,460 


2,000 


11 


22 


45 


79 


112 


240 


432 


681 


1,420 



Note: All table entries are rounded to 3 significant digits. 

'Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside 

diameter of the copper tubing products. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



179 



Table 12-16 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 12-16 Semi-Rigid Copper Tubing [NFPA Table 6.2 (j)] 

















Gas: 


Natural 




Inlet Pressure: 


2.0 psi 




Pressure Drop: 


I.Opsi 




Specific Gravity: 


0.60 




Tube Size (in.) 


Nominal: 


K&L: 


Vi 


% 


'/4 


'A 


% 


1 


W* 


m 


2 
























ACR: 


% 


V2 


% 


% 


'/& 


VA 


1% 


— 


— 


Outside: 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside:* 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.4«1 


1.959 


Length (ft) 








Capacity in 


Cubic Feet of Gas per Hour 








10 


245 


506 


1,030 


1,800 


2,550 


5,450 


9,820 


15,500 


32,200 


20 


lf>9 


348 


708 


1,240 


1,760 


3,750 


6,750 


10,600 


22,200 


30 


135 


279 


568 


993 


1.410 


3,010 


5,420 


8,550 


17,800 


40 


116 


239 


486 


850 


1,210 


2,580 


4,6'10 


7,310 


15,200 


50 


103 


212 


431 


754 


1,070 


2,280 


4,110 


6,480 


13,500 


60 


93 


192 


391 


683 


969 


2,070 


3,730 


5,870 


12,200 


70 


86 


177 


359 


628 


891 


1,900 


3,430 


5,400 


11,300 


80 


80 


164 


3.34 


584 


829 


1.770 


3,190 


5,030 


10,500 


90 


75 


154 


314 


548 


778 


1,660 


2,990 


4,720 


9,820 


100 


71 


146 


296 


518 


735 


1,.570 


2,830 


4.450 


9,280 


125 


63 


129 


263 


459 


651 


1,390 


2,500 


3,950 


8,220 


150 


57 


117 


238 


416 


590 


1,260 


2,270 


3,580 


7,450 


175 


52 


108 


219 


383 


543 


1,160 


2,090 


3,290 


6,850 


200 


49 


100 


204 


356 


505 


1,080 


1,940 


3,060 


6,380 


250 


43 


89 


181 


315 


448 


956 


1,720 


2,710 


5,650 


30O 


39 


80 


164 


286 


406 


866 


1,560 


2,460 


5.120 


350 


36 


74 


150 


263 


373 


797 


1,4.30 


2,260 


4,710 


400 


33 


69 


140 


245 


347 


741 


1,330 


2,100 


4,380 


450 


31 


65 


131 


230 


326 


696 


1,250 


1.970 


4,110 


500 


30 


61 


124 


217 


308 


657 


1,180 


1,870 


3,880 


550 


28 


58 


118 


206 


292 


624 


1,120 


1.770 


3,690 


600 


27 


55 


112 


196 


279 


595 


1,070 


1,690 


3,520 


650 


26 


53 


108 


188 


267 


570 


1.030 


1,620 


3,370 


700 


25 


51 


103 


181 


256 


548 


986 


1,550 


3,240 


750 


24 


49 


100 


174 


247 


528 


950 


1,500 


3,120 


800 


23 


47 


96 


168 


239 


510 


917 


1,450 


3,010 


850 


22 


46 


93 


163 


231 


493 


888 


1,400 


2.920 


900 


22 


44 


90 


158 


224 


478 


861 


1,360 


2,830 


950 


21 


43 


88 


153 


217 


464 


836 


1,320 


2,740 


1.000 


20 


42 


85 


149 


211 


452 


813 


1,280 


2,670 


i,l(K) 


19 


40 


81 


142 


201 


429 


772 


1,220 


2,540 


1,200 


18 


38 


77 


135 


192 


409 


737 


1,160 


2,420 


13(X> 


18 


36 


74 


129 


183 


392 


705 


1,110 


2,320 


1,400 


17 


35 


71 


124 


176 


376 


678 


1,070 


2,230 


1,500 


16 


34 


68 


120 


170 


363 


653 


1,030 


2.140 


1.600 


16 


33 


66 


116 


164 


350 


630 


994 


2,070 


IJOO 


15 


31 


64 


112 


159 


339 


610 


962 


2,000 


1.800 


15 


30 


62 


108 


154 


329 


592 


933 


1,940 


1,900 


14 


30 


60 


105 


149 


319 


575 


906 


1,890 


2.0(K) 


14 


29 


59 


102 


145 


310 


559 


881 


1,830 



Note: All table entries are rotmded to 3 significant digits. 

^liible capacities are based on Type K copper tubing inside diameter (shown), which has the sraallest inside 

diameter of the copper tubing products. 



180 



FUEL PIPING 



Table 12-17 



Table 12-17 Semi-Rigid Copper Tubing [NFPA Table 6.2(k)] 





Gas: 


Natural 




Inlet Pressure: 


2,0 psi 




Pressure Drop: 


1.5 psi 




Specific Gravity: 


0.60 



SPF.CIAI. U.SE: Pipe .Si/ing Between Point of Deliver}- and tite House Line Regulator. Total Load Supplied by a 
Single Hou.se Line Regulator Not tlxreeding 130 Clubir Feet pc r Hour.* 





Tube Size (in.) 




K&L: 


V* 


% 


VI 


% 


y* 


1 


I'/i 


IW 


2 


Nominal: 
























ACR: 


y» 


W 


% 


% 


% 


IH 


1% 


— 


— 


Outside: 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside:* 


0.305 


0.402 


0.527 


0.632 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 








Capacity in 


Cubic Feet of Gas per Hour 








10 


303 


625 


1,270 


2,220 


3,150 


6,740 


12,100 


19,100 


39,800 


20 


208 


430 


874 


1,530 


2,170 


4,630 


8,330 


1,3,100 


27,400 


30 


167 


345 


702 


1,230 


1,740 


3,720 


6,690 


10,600 


22,000 


40 . 


143 


295 


601 


1.050 


1,490 


3,180 


5,730 


9,030 


18,800 


50 


127 


262 


532 


931 


.1.320 


2,820 


5,080 


8,000 


16,700 


60 


115 


237 


482 


843 


1,200 


2.560 


4,600 


7,250 


15,100 


70 


106 


218 


444 


776 


l,l(K) 


2,350 


4,230 


6,670 


13,900 


SO 


98 


203 


413 


722 


1.020 


2,190 


3.940 


6,210 


12,900 


90 


92 


190 


387 


677 


961 


2,050 


3,690 


5,820 


12,100 


100 


87 


180 


366, 


640 


907 


1,940 


3,490 


5,500 


ll..,500 


125 


77 


159 


324 


567 


804 


1.720 


3.090 


4,880 


10,200 


150 


70 


144 


294 


514 


729 


1,560 


2,800 


4,420 


9.200 


175 


64 


133 


270 


472 


670 


1,430 


2,580 


4,060 


8,460 


200 


60 


124 


252 


44.0 


624 


1,330 


2,4(K) 


3,780 


7,870 


250 


53 


110 


223 


390 


553 


1,180 


2.130 


3,350 


6,980 


300 


48 


99 


202 


353 


501 


1,070 


1.930 


3,040 


6,320 


350 


44 


91 


186 


325 


461 


984 


1,770 


2,790 


5,820 


400 


41 


85 


173 


802 


429 


916 


1.650 


2,600 


5,410 


450 


39 


80 


162 


283 


402 


859 


1.550 


2,440 


5.O80 


500 


36 


75 


153 


268 


380 


811 


1,460 


2,300 


4,800 


550 


,35 


72 


14.6 


254 


361 


771 


1.390 


2,190 


4,560 


600 


33 


68 


139 


243 


344 


735 


1.320 


2.090 


4.350 


650 


32 


65 


1,33 


232 


330 


704 


1,270 


2,000 


4,160 


700 


30 


63 


128 


223 


317 


676 


1,220 


1,920 


4,000 


750 


29 


60 


123 


215 


305 


652 


1,170 


1.850 


3,850 


800 


28 . 


58 


119 


208 


295 


629 


1,130 


1,790 


3,720 


850 


27 


57 


115 


201 


285 


609 


1.100 


1,730 


3,600 


9(K) 


27 


.55 


111 


195 


276 


590 


1.060 


1,680 


3,490 


950 


26 


53 


108 


189 


268 


573 


1,030 


1,630 


3,390 


1,000 


25 


52 


105 


184 


261 


5.58 


1,000 


1,380 


3,300 


1,100 


24 


49 


100 


175 


248 


,5.30 


954 


1,500 


3,130 


1,200 


23 


47 


95 


167 


237 


505 


910 


1,430 


2,990 


1.300 


22 


45 


91 


160 


227 


484 


871 


1,370 


2,860 


1,400 


21 


43 


88 


153 


218 


463 


837 


1,.320 


2,7.50 


1,500 


20 


42 


85 


148 


210 


448 


806 


1,270 


2,650 


1,600 


19 


40 


82 


143 


202 


432 


779 


1,230 


2,560 


1,700 


19 


39 


79 


138 


196 


419 


753 


1,190 


2,470 


1,800 


18 


38 


77 


134 


190 


406 


731 


1,150 


2,400 


1,900 


18 


37 


74 


130 


184 


394 


709 


1,120 


2,330 


2,000 


17 


36 


72 


126 


179 


383 


690 


1,090 


2,270 



Note: All table entries aie rounded to 3 significant digits, 

*Tab)e capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside 
diameter of the copper tubing products. 

*Wlien this table is used to size the tubing upstream of a line pressure regulator, the pipe or tttbing down- 
stream of the line pressure regulator shall be sized using a pressure drop no greater than 1 in. w.c. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



181 



Table 12-18 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 12-18 Semi-Rigid Copper Tubing [NFPA Table 6.2(1)] 

















Gas: 


Natural 




Inlet Pressure: 


5.0 psi 




Pressure Drop: 


3.5 psi 




Specific Gravi^ 


0.60 




Tube Size (in.) 




K&L: 


.V4 


ys 


Vi 


% 


Vt 


1 


V/i 


VA 


2 


Noniiiial: 
























ACR: 


H 


H 


■% 


¥a 


% 


l'/4 


1% 


— ■ 


— 


Outside: 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside:* 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


511 


1,050 


2,140 


3,750 


5,320 


11,400 


20,400 


32,200 


67,100 


20 


351 


724 


1.470 


2,580 


3,650 


7.800 


14,000 


22,200 


46,100 


30 


282 


582 


1,180 


2,070 


2,930 


6,270 


11,300 


17,800 


37,000 


40 


241 


498 


1,010 


1,770 


2.510 


5,.360 


9,660 


15,200 


31,700 


50 


214 


441 


898 


1,570 


2,230 


4,750 


8,560 


13,.50O 


28,100 


60 


194 


400 


813 


1,420 


2,020 


4,310 


7,7.50 


12,200 


25,500 


70 


178 


368 


748 


1,310 


1,860 


3,960 


7,130 


11,200 


2.3,400 


80 


166 


342 


696 


1,220 


1,730 


3,690 


6,640 


10,500 


21.800 


90 


156 


321 


653 


1.140 


1,620 


3,460 


6,2.30 


9,820 


20,400 


100 


147 


303 


617 


1,080 


1,530 


3,270 


5,880 


9,270 


19,300 


125 


130 


269 


547 


955 


1.360 


2,900 


5,210 


8,220 


17,100 


150 


118 


243 


495 


866 


1,230 


2,620 


4.720 


7,450 


15,500 


175 


109 


224 


456 


796 


1,130 


2,410 


4,350 


6,850 


14,300 


200 


101 


208 


424 


741 


1.050 


2.250 


4,040 


6,370 


13,.300 


250 


90 


185 


376 


657 


932 


1,990 


3,580 


5,650 


11,800 


300 


81 


167 


340 


595 


844 


1,800 


3,250 


5,120 


10.700 


350 


75 


154 


313 


547 


777 


1,660 


2,990 


4,710 


9,810 


400 


69 


143 


291 


50<> 


722 


1,540 


2.780 


4,380 


9,120 


450 


65 


134 


273 


478 


678 


1,450 


2,610 


4,110 


8,560 


5(K) 


62 


127 


258 


451 


640 


1,370 


2,460 


3,880 


8,090 


550 


58 


121 


245 


429 


608 


1,300 


2.340 


3,690 


7,680 


600 


56 


115 


234 


409 


.580 


1,240 


2,230 


3,520 


7.330 


650 


53 


110 


224 


392 


556 


1,190 


2,140 


3,370 


7,020 


700 


51 


106 


215 


376 


534 


1,140 


2,0.50 


3,240 


6,740 


750 


49 


102 


207 


362 


514 


1,100 


1,980 


.3,120 


6,490 


800 


48 


98 


200 


350 


497 


1,060 


1,910 


3,010 


6,270 


850 


46 


93 


194 


339 


481 


1,0.30 


1,8.50 


2,910 


6,070 


900 


45 


92 


188 


328 


466 


1,000 


1,790 


2,820 


5.880 


950 


43 


90 


182 


319 


452 


967 


1,740 


2,740 


5,710 


1,000 


42 


87 


177 


310 


440 


940 


1,690 


2,670 


5,560 


1,100 


40 


83 


169 


295 


418 


893 


1,610 


2,530 


5,280 


1,200 


38 


79 


161 


281 


399 


8.52 


1.5,30 


2,420 


5,040 


1,300 


37 


76 


154 


269 


382 


816 


1,470 


2,320 


4,820 


1,400 


35 


73 


148 


259 


.367 


784 


1,410 


2,220 


4,6.30 


1,5(X» 


34 


70 


143 


249 


.353 


755 


1,360 


2,140 


4,460 


1,600 


33 


68 


138 


241 


.341 


729 


1,310 


2,070 


4.310 


1,700 


32 


65 


133 


233 


330 


705 


1,270 


2,000 


4,170 


1,800 


31 


63 


129 


226 


320 


684 


1,230 


1,940 


4,040 


1,900 


30 


62 


125 


219 


311 


664 


1,200 


1,890 


3,930 


2,000 


29 


60 


122 


213 


802 


646 


1,160 


1,830 


3,820 



Note: All table entries are rounded to 3 significant digitus. 

"Table capadtTe,s are based on T>'pe K copper tubing inside diameter (shown), which has the smallest inside 

diameter of the copper tubing products. 



182 



FUEL PIPING 



Table 12-19 -Table 12-20 



Table 12-19 Corrugated Stainless Steel Tubing (CSST) [NFPA Table 6.2(m)] 























Gas: 


Natural 






Inlet Pressure: 


Less than 2 psl 




Pressarc Drop: 


0.5 in. w. 


c 




Specific Gravity: 


0.60 




Tube Size (EHD)* 


How Designation: 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


„ 


62 


Length (ft) 


Capacity in Cubic Feet of Gas per Mour 


5 


46 


63 


115 


1S4 


225 


270 


471 


546 


895 


1,790 


2,070 


3,660 


4,140 


10 


32 


44 


82 


95 


161 


192 


330 


383 


6.39 


1,260 


1,470 


2,600 


2,930 


15 


25 


35 


6(i 


77 


132 


IS- 


267 


310 


524 


1,030 


1.200 


2,140 


2,400 


20 


Ti 


31 


58 


67 


116 


IS? 


231 


269 


■156 


888 


1,050 


1,850 


2,080 


25 


19 


27 


52 


60 


104 


122 


206 


240 


409 


793 


9,36 


1,660 


1,860 


30 


18 


25 


47 


53 


96 


112 


188 


218 


374 


723 


856 


1,320 


1,700 


40 


15 


21 


41 


47 


83 


97 


162 


188 


,325 


625 


742 


1„320 


1,470 


m 


13 


19 


.S7 


42 


7.5 


87 


144 


IBS 


25)2 


5.59 


665 


1,180 


1,320 


60 


12 


17 


34 


38 


68 


80 


131 


153 


267 


509 


608 


1,080 


1,200 


70 


11 


16 


31 


36 


63 


74 


121 


141 


248 


471 


563 


l.OflO 


1.110 


80 


10 


15 


29 


33 


60 


69 


113 


132 


232 


440 


527 


940 


1,040 


90 


10 


M 


28 


.92 


.57 


m 


107 


125 


219 


415 


498 


887 


983 


UK) 


9 


13 


26 


.30 


54 


62 


toi 


118 


208 


393 


472 


843 


933 


150 


7 


10 


20 


23 


42 


48 


78 


91 


171 


320 


387 


691 


762 


200 


6 


9 


18 


21 


38 


44 


71 


82 


148 


277 


336 


mi 


661 


250 


5 


8 


le 


19 


34 


39 


63 


74 


1.33 


247 


301 


338 


."iOl 


.«MH) 


5 


7 


1.5 


17 


32 


36 


57 


67 


9.5 


226 


275 


492 


.540 



*EHD = Equi^'alent Hydraulic Diameter, which h a measure of the relative hydraulic efficiency between 

different luhing sizes. The greater the vahie of El ID, (;lie greater the gas capacity of tite lulling. 

Notes; 

(1) Table includes losses for four 90 degree bends and two end fitungs. Tubing nins with latter numbers of 
bends and/or fittings shall be increased by an equivalent length of tubing to the following equadon: /, = 1 Sti, 
where L is additional length (ft) of tubing and n is the number of additional fittings and/or bends. 

(2) All table entries are rounded to 3 significant digits. 



Table 1 2-20 Corrugated Stainless Steel Tubing (CSST) [NFPA Table 6,2(n)] 























Gas: 


Natural 






Inlet Presisure: 


Less than 2 psi 




Pressure Drop: 


3.0 in. W.C. 




Specific Gravity: 


0.60 




Tube Size (EHD)* 


Flow Designation: 


1$ 


15 


18 


19 


23 25 


30 


31 


37 


46 48 


60 


62 


Length (ft) 










Capadty^ in Cubic Feet of C 


rasper Ho 


ur 








.5 


120 


160 


277 


327 


529 


649 


1,180 


1,370 


2,140 


4,430 


5,010 


8.800 


10,100 


10 


S3 


112 


197 


231 


380 


462 


828 


958 


1,530 


3.200 


3,560 


6.270 


7,160 


15 


67 


90 


161 


189 


313 


379 


673 


778 


1,250 


2„540 


2,910 


5,140 


5,8.50 


20 


57 


78 


140 


164 


273 


329 


580 


672 


1,090 


2,200 


2.,530 


4,460 


5,070 


25 


51 


69 


125 


147 


245 


295 


,518 


.599 


978 


1,960 


2,270 


4,000 


4.540 


30 


46 


63 


115 


134 


225 


270 


471 


546 


895 


1,790 


2,070 


3,660 


4,140 


40 


39 


54 


100 


116 


196 


234 


407 


471 


778 


1,550 


1,800 


3,180 


3,590 


50 


35 


48 


89 


104 


176 


210 


363 


421 


698 


1,380 


1,610 


2,8.50 


3,210 


60 


32 


44 


82 


95 


161 


192 


330 


383 


639 


1,260 


1,470 


2,600 


2,930 


70 


29 


41 


76 


88 


1.50 


178 


306 


.355 


593 


1,170 


1,360 


2,420 


2,720 


80 


27 


38 


71 


82 


141 


167 


285 


831 


555 


1,090 


1,280 


2,260 


2,540 


«) 


26 


36 


67 


77 


133 


157 


268 


311 


524 


1,030 


1,200 


2,140 


2,400 


100 


24 


34 


63 


73 


126 


149 


254 


295 


498 


974 


1,140 


2,030 


2,280 


150 


19 


27 


52 


60 


104 


122 


206 


240 


409 


793 


9.36 


1,660 


1,860 


200 


17 


23 


45 


52 


91 


106 


178 


207 


355 


686 


812 


1,440 


1,610 


2.50 


15 


21 


40 


46 


82 


95 


1,59 


184 


319 


613 


728 


1,290 


1,440 


300 


13 


19 


37 


42 


75 


87 


144 


168 


234 


559 


665 


1,180 


1,320 



*EHD = Equivalent Hydraulic Diameter, which is a tneasure of the relative liydraulic efficiency bettveen 

different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing. 

Notes: 

(1) Table includes losses for four 90 degree bends and two end fittings. Tubing runs with larger numbers of 
l>ends and/or fittings shall be increased by an equivalent length of tubing to the following equation: /., = 1 .3 n, 
where L is additional length (ft) of tubing and n is the number of additional fittings and/or bends. 

(2) All table entries are rounded to 3 significant digits. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



183 



Table 12-21 -Table 12-22 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 12-21 Corrugated Stainless Steel Tubing (CSST) [NFPA Table 6.2(o)] 























Gas: 


Natural 






Inlet Pressure: 


Less than 2 psi 




Fressiwre Brop: 


6.0 in. w.c. 




Specific Gravity: 


0.60 




Tube Size (EHD)* 


Flow Designation: 


13 




18 


19 


23 


25 


30 


" 


37 


46 


48 


60 


62 


Lengrt>(ft) 


Capacity in Cubic Feet of Gas per Hour 


5 


173 


229 


389 


461 


737 


911 


1.690 


1.950 


3,000 


8,280 


7,050 


12.400 


14,260 


JO 


120 


160 


277 


327 


529 


649 


1,180 


1,370 


• 2,140 


4.430 


5,010 


8,800 


10,100 


15 


9(i 


130 


227 


267 


436 


532 


960 


1,110 


1,760 


3,610 


4,i00 


7,210 


8,260 


20 


S$ 


112 


197 


231 


380 


462 


828 


958 


1.330 


3,120 


3.360 


6.270 


7,160 


25 


74 


99 


I7fi 


207 


342 


414 


739 


855 


1,370 


2,790 


3,190 


5,620 


6,400 


i«) 


67 


00 


Mil 


189 


313 


379 


673 


778 


1.250 


2,.540 


2,910 


.5.140 


5,850 


40 


37 


78 


140 


164 


273 


329 


580 


672 


1,090 


2,200 


2,530 


4,4(iO 


5,070 


r>o 


31 


69 


123 


147 


243 


295 


518 


599 


978 


1,960 


2,270 


4,000 


4,540 


so 


46 


63 


115 


134 


225 


270 


471 


546 


895 ■ 


1,790 


2,070 


3,660 


4,140 


70 


42 


58 


i06 


124 


209 


250 


435 


505 


830 


1,660 


1,920 


3,.390 


3,840 


80 


39 


54 


lOO 


116 


196 


234 


407 


471 


778 


1,550 


1,800 


3,180 


3,590 


90 


37 


5! 


9-1 


109 


!85 


221 


383 


444 


735 


1,460 


1.700 


3.000 


3,390 


IQO ' 


35 


48 


89 


104 


176 


210 


363 


421 


698 


1,380 


1,610 


2,8:'>0 


3,210 


150 


28 


39 


73 


83 


143 


172 


294 


342 


373 


1,130 


1.320 


2,340 


2,630 


200 


24 


34 


63 


73 


126 


149 


254 


295 


498 


974 


1,140 


2,030 


2,280 


250 


21 


30 


57 


66 


114 


134 


226 


263 


447 


870 


1,020 


1,820 


2.040 


300 


19 


27 


52 


60 


104 


122 


206 


240 


409 


793 


956 


1,660 


1,860 



"EHD = Equivalent Hydraulic Diameter, which is a measure of the relative hydrauHc efficiency txitwcen 

different mbing sizes. The greater the value of EIID, the greater the gas capacity of the tubing. 

Notes: 

(1) Table includes losses for four 9()-<iegree tx;nds and two end fittings. Tubing runs with larger numbers of 
bends and/or fittings .shall be increased by an equivalent length of tubing to the following equation: L= X .3n, 
where £is addiliona! length (ft) of tubing and nis the number of additional fittings and/or bends. 

(2) All table entries are rounded to ,? significant digits. 



Table 12-22 Corrugated Stainless Steel Tubing (CSST) [NFPA Table 6.2(p)] 























Gas: 


Natural 






Inlet Pressure: 


2.0 psi 




Pressure Drop: 


1.0 psi 




Spedftc Gravity! 


0.60 




Tube Size (EHB)* 


How Designation: 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


270 


353 ' 


587 


700 


1,100 


1,370 


2,590 


2,990 


4,510 


9,600 


10,700 


18.600 


21,600 


25 


166 


220 


374 


444 


709 


876 


1,620 


1,870 


2,890 


6,040 


6,780 


11,900 


1.3.700 


30 


151 


200 


342 


405 


650 


801 


1,480 


1,700 


2.640 


5,510 


6,200 


10,900 . 


12,500 


40 


129 


172 


297 


351 


567 


696 


1,270 


1,470 


2,300 


4,760 


5,380 


9,440 


10,900 


50 


115 


154 


266 


314 


510 


624 


1,140 


1,310 


2,060 


4,260 


4,820 


8,470 


9,720 


75 


03 


124 


218 


257 


420 


512 


922 


1,070 


1,690 


3,470 


3,950 


6,940 


7,940 


80 


89 


120 


211 


249 


407 


496 


892 


1,030 


1,640 


3.360 


3,820 


6,730 


7,690 


100 


79 


107 


189 


222 


.366 


445 


795 


920 


1,470 


3,000 


3,420 


6.030 


6,880 


1.50 


64 


87 


155 


182 


302 


364 


646 


748 


1,210 


2,440 


2,800 


4,940 


5,620 


200 


55 


75 


135 


157 


263 


317 


557 


645 


1.050 


2,110 


2,430 


4,290 


4,870 


250 


49 


67 


121 


141 


2.36 


284 


497 


576 


941 


1,890 


2,180 


.3,850 


4,360 


300 


44 


61 


110 


129 


217 


260 


453 


525 


862 


1,720 


1,990 


3,520 


3,980 


400 


38 


52 


96 


111 


189 


225 


390 


453 


749 


1,490 


1,730 


3,060 


3.450 


500 


34 


46 


86 


](X) 


170 


202 


348 


404 


552 


1,330 


1,550 


2,740 


S.OilO 



*EHD = Equivalent Hydraulic Diameter, which is a measure of tlie relative hydraulic efRciency between 

different tubing sizes. The greater the vahte of EHD, the greater the gas capacity of the mbing. 

Notes: 

(1) Table does not include effect of pressure drop across the Une regulator. Where regulator loss exceeds 
% psi, do not usethis table. Ck)nsult with regulator manufacturer for pressure drops and capacity factors. 
Pressure drops across a regulator may vary willi flow rate. 

(2) CAUTION: C«»pacities sho^vn in table may exceed maximum capacit}' for a selected regulator. Consult 
with regulator or tubing manufacturer for guidance. 

{3) Table Includes losses lor fbur 90<legrec bends and two end fitdngs. Tubing nins with larger niunber of 
bends and/or fittings shall be increased by an equivalent length of tubing according to the following equa- 
tion: L ~ 1.3ft, where L is additional length (ft) of tubing and n is tlie number of additional fittings and/or 
bends. 
(4) All table entries are rounded to 3 .significant digits. 



184 



FUEL PIPING 



Table 12-23 -Table 12-24 



Table 12-23 Corrugated Stainless Steel Tubing (CSST) 


[NEPA Table 6.2(q): 






















Gas: 


Natural 




Inlet Pressure: 


5.0 psi 




Pressure Drop: 


3.5 psi 




Specific Gravity: 


0.60 




Tube Size (EHD)* 


Flow Designation: 


13 


IS 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


I>ength (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


523 


674 


1,080 


1,300 


2.000 


2,530 


4,920 


5,660 


8,300 


18,100 


19,800 


34,400 


40,400 


25 


322 


420 


691 


827 


1,290 


1,620 


3,080 


3,540 


5,310 


11,400 


12,600 


22,000 


25,600 


30 


292 


382 


632 


755 


1,180 


1,480 


2,800 


3,2,30 


4,860 


10,400 


M,.500 


20,100 


23,400 


40 


251 


329 


549 


654 


1,030 


1,280 


2.420 


2,790 


4.230 


8,970 


10,000 


17,400 


20.200 


50 


223 


293 


492 


586 


926 


1,150 


2,160 


2,490 


3,790 


8,020 


8,930 


15,6(H) 


18,100 


75 


180 


238 


403 


479 


763 


944 


1,7.50 


2,020 


3,110 


6,.530 


7,320 


12,800 


14,800 


80 


174 


230 


391 


463 


740 


915 


1,690 


1,960 


3,020 


6,320 


7,090 


12.400 


14,300 


100 


154 


205 


350 


415 


665 


820 


1,510 


1,740 


2,710 


5,650 


6,350 


11,100 


12,800 


150 


124 


166 


287 


339 


548 


672 


1.230 


1,420 


2,220 


4,600 


5,200 


9,130 


10,500 


200 


107 


143 


249 


294 


478 


584 


1,060 


1.220 


1,930 


3,980 


4,510 


7,930 


9,090 


250 


95 


128 


223 


263 


430 


524 


945 


1,090 


1,730 


3,,550 


4,040 


7,110 


8,140 


300 


86 


116 


204 


240 


394 


479 


860 


995 


1,590 


3,240 


3.690 


6,500 


7,430 


4(K) 


74 


100 


177 


208 


343 


416 


742 


858 


1,380 


2,800 


3,210 


5,650 


6,440 


500 


66 


89 


159 


186 


309 


373 


662 


766 


1,040 


2,500 


2,870 


5,060 


5,760 



*EHD = Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between 

different tubing sizes. The greater the value of EHD, the greater the ga.s capacity of the tubing. 

Notes; 

(1) Table does not include effect of pressure drop across line regulator. Wliere regulator loss exceeds 1 psi, 
do not use this table. Consult with regulator mamifactiirer for pressure drops and capacity factors. Pres.sure 
drop across regulator may v-ary with the flow rate. 

(2) C!IAUTION: Capacities shown in table may exceed maximum capacity of selected regulator. Consult with 
tubing manufacturer for guidance. 

(3) Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of 
bends and/or fittings shall be increased by an equivalent length of tubing to the following equation: L = I. 'in, 
where /. is additional length (ft) of tubing and n is the number of additional fittings and/or bends. 

(4) All table entries are rounded to 3 significant tligits. 



lable 12-24 Folyethylene Flastic Tipe [NFPA Table 6.2(r)] 









Gas: 


Natural 




Inlet Pressure: 


I.£ss than 2 psi 




Pressure Drop: 


0.3 in. w.c. 




Speciflc Gravity: 


0.60 




Pipe Size (in.) 


Nominal OD: 


W 


»/4 


I 


VA 


1V4 


2 


Designation: 


SDR 9.83 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID: 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Lei^ltfa (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


153 


,305 


551 


955 


1,440 


2,590 


20 


105 


210 


379 


656 


991 


1,780 


30 


84 


169 


.%4 


.527 


796 


1,4.30 


40 


72 


144 


260 


451 


681 


1,220 


50 


64 


128 


231 


400 


604 


1,080 


60 


58 


116 


209 


362 


547 


983 


70 


53 


107 


192 


333 


503 


904 


80 


50 


99 


179 


310 


468 


841 


90 


46 


93 


168 


291 


439 


789 


100 


44 


88 


159 


275 


415 


745 


125 


39 


78 


141 


243 


368 


661 


150 


35 


71 


127 


221 


333 


.598 


175 


32 


65 


117 


203 


306 


551 


200 


30 


60 


109 


189 


285 


512 


250 


27 


54 


97 


167 


253 


4.54 


300 


24 


48 


88 


152 


229 


411 


350 


22 


45 


81 


139 


211 


378 


400 


21 


42 


75 


130 


196 


352 


450 


19 


39 


70 


122 


184 


330 





18 


37 


66 


115 


174 


312 



Note: All table entries are rounded to 3 significant digits. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



185 



Table 12-25 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 12-25 Polyethylene Plastic Pipe [NFPA Table 6.2(s)] 









Gas: 


Natural 




Inlet Pressure: 


Less than 2 psd 




Pressure Drop: 


0.5 in. w.c. 




Specific Gravity: 


0.60 




Pipe Size (in.) 


Nominal OD: 


V4 


V4 


1 


VA 


IM. 


2 


Designation: 


SDR 9.33 


SDR 1 1.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID: 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


201 


403 


726 


1.260 


1,900 


3,410 


20 


138 


277 


499 


865 


1,310 


2,350 


30 


111 


222 


401 


695 


1,050 


1,880 


40 


95 


190 


343 


594 


898 


1,610 


50 


84 


169 


304 


527 


796 


1,430 


60 


76 


153 


276 


477 


721 


1,300 


70 


70 


140 


254 


439 


663 


1,190 


80 


65 


131 


236 


409 


617 


1,110 


90 


61 


123 


221 


383 


579 


1,040 


100 


58 


116 


209 


362 


547 


983 


125 


51 


103 


185 


321 


485 


871 


150 


46 


93 


lf)8 


291 


439 


789 


175 


43 


86 


154 


268 


404 


726 


200 


40 


80 


144 


249 


376 


675 


250 


35 


71 


127 


221 


333 


598 


300 


32 


64 


115 


200 


302 


542 


350 


29 


59 


106 


184 


278 


499 


400 


27 


55 


m 


171 


258 


464 


450 


26 


51 


93 


160 


242 


435 


500 


24 


48 


88 


152 


229 


411 



Note: All table entries are rounded to 3 significant digits. 



186 



FUEL PIPING 



Table 12-26 



Table 12-26 Polyethylene Plastic Pipe [NFPA Table 6.2(t)] 









Gas: 


Natural 




Inlet Pressure: 


2.0 psi 




Pressure Drop: 


I.Opsi 




Specific Graivi^ 


0.60 




Pipe Size (in.) 


Nominal OD: 


V4 


% 


1 


VA 


IW 


2 


Designation: 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID: 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


1.860 


3,720 


6,710 


11,600 


17,600 


31,600 


20 


1,280 


2,560 


4,610 


7,990 


12,100 


21,700 


30 


1,030 


2.050 


3,710 


6,420 


9,690 


17,400 


40 


878 


1,760 


3,170 


5,490 


8,300 


14,900 


30 


778 


1,560 


2,810 


4,870 


7,350 


13,200 


60 


705 


1,410 


2,550 


4,410 


6,660 


J2,000 


70 


649 


1,300 


2.340 


4,060 


6,130 


11,000 


80 


603 


1,210 


2,180 


3,780 


5,700 


10,200 


90 


566 


1,130 


2,050 


3,540 


5,350 


9,610 


100 


535 


1,070 


1,930 


3,350 


5,050 


9,080 


125 


474 


949 


1,710 


2,970 


4,480 


8.050 


150 


429 


860 


1,550 


2,690 


4,060 


7,290 


175 


395 


791 


1,430 


2,470 


3,730 


6,710 


200 


368 


736 


1,330 


2,300 


3,470 


6,240 


250 


326 


652 


1,180 


2,040 


3,080 


5,530 


300 


295 


591 


1,070 


1,850 


2,790 


5,010 


350 


272 


544 


981 


1,700 


2,570 


4,610 


400 


253 


506 


913 


1,580 


2,390 


4,290 


450 


237 


475 


856 


1,480 


2,240 


4.020 


500 


224 


448 


809 


1,400 


2,120 


3,800 


550 


213 


426 


768 


1,330 


2,010 


3,610 


600 


203 


406 


733 


1.270 


1,920 


3,440 


650 


194 


889 


702 


1,220 


1,840 


3,300 


700 


187 


374 


674 


1,170 


1,760 


3,170 


750 


180 


360 


649 


1,130 


1,700 


3,050 


800 


174 


348 


627 


1,090 


1,640 


2,9.50 


850 


168 


336 


607 


1,050 


1,590 


2,850 


900 


163 


326 


588 


1,020 


1.540 


2,770 


950 


1.58 


317 


572 


990 


1,500 


2,690 


1.000 


154 


308 


556 


963 


1,450 


2,610 


1,100 


146 


293 


528 


915 


1,380 


2,480 


1.200 


139 


279 


504 


873 


1,320 


2,370 


1,300 


134 


267 


482 


836 


1,260 


2.270 


1,400 


128 


257 


463 


803 


1,210 


2,180 


1,500 


124 


247 


446 


773 


1,170 


2,100 


1,600 


119 


239 


431 


747 


1,130 


2,030 


1,700 


115 


231 


417 


723 


1.090 


1,960 


1,800 


112 


224 


404 


701 


1.060 


1,900 


1,900 


109 


218 


393 


680 


1,030 


1,850 


2,000 


106 


212 


382 


662 


1.000 


1,800 



Note: All table entries are rounded to 3 significant digits. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA- 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



187 



Table 12-27 -Table 12-28 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 12-27 Polyethylene Plastic Tubing 
[NFPA Table 6.2(u)] 





Gas: 


Natural 




Inlet Pressure: 


Less than 2.0 psi 




Pressure Drop: 


0.3 in. w.c. 




Specific Gravity: 


0.60 




Plastic Tubing Size (CTS)* (in.) 


Nominal OD: 


1/2 


% 


Designation: 


SDR 7.00 


SDR 11.00 


Actual ID: 


0.445 


0.927 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


54 


372 


20 


37 


256 


30 


30 


205 


40 


26 


176 


50 


23 


156 


60 


21 


141 


70 


19 


130 


80 


18 


121 


90 


17 


113 


100 


16 


107 


125 


14 


95 


150 


13 


86 


175 


12 


79 


200 


11 


74 


226 


10 


69 


250 


NA 


65 


275 


NA 


62 


300 


NA 


59 


350 


NA 


54 


400 


NA 


51 


450 


NA 


47 


500 


NA 


45 



Table 12-28 Polyethylene Plastic Tubmg 

[NFPA Table 6.2(v)] 





Gas: 


Natural 




Inlet Pressure: 


IjesH than 2.0 psi 




Pressure Drop: 


0.5 in. w.c. 




Specific Gravity: 


0.60 




Plastic Tubing Size (CTS)* (in.) 


Nominal OD: 


Vt 


Va 


Designation: 


SDR 7.00 


SDR 11.00 


Actual ID: 


0.445 


0.927 


Length (ft) 


Capacity in Cubic Feet of Gas per Hour 


10 


72 


490 


20 


49 


337 


30 


39 


271 


40 


34 


232 


50 


30 


205 


60 


27 


186 


70 


25 


171 


80 


23 


159 


90 


22 


149 


100 


21 


141 


125 


18 


125 


150 


17 


113 


175 


15 


104 


200 


14 


97 


225 


13 


91 


250 


12 


86 


275 


11 


82 


300 


11 


78 


350 


10 


72 


400 


NA 


67 


450 


NA 


63 


500 


NA 


59 



*CTS = Copper tube size. 

NA means a flow of less than 10 cfti. 

Note: All table entries are rounded to 3 significant digits. 



*CTS = Ckjpper tube size. 

NA means a flow of less than 10 cfli. 

Note: All table entries are rounded to 3 significant digits. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



188 



FUEL PIPING 



Table 12-29 



Table 12-29 Schedule 40 Metallic Pipe [NFPA Table 6.3(a)] 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Gas: 



Inlet Pressure: 



Pressure Drop: 



Specific Gravity: 



Undiluted Propane 



10.0 psi 



1.0 psi 



1.50 



SPKCIAl. l.'SK: Pipe Siriiit; Belwet-n iMt.sl Stajre (High Pressuro Kcgtilafor) and Second Slu^c (Low Pressure Rff;ulatt>r) 



Pipe Size (in.) 



Nominal 








1 












Inside: 


•A 


% 


1 


VA 


VA 


2 


m 


.3 


4 


Actual: 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 








Capacity in Tliousands of Btu 


per Hour 








10 


3,320 


6,950 


13,100 


26,900 


40,.300 


77,600 


124,000 


219,000 


446,000 


20 


2,280 


4,780 


9,000 


18,500 


27,700 


53,300 


85,000 


150,000 


306,000 


30 


1,830 


3,840 


7,220 


14,8(K) 


22,200 


42,800 


68,200 


121,(K)0 


246,000 


40 


1,570 


3,280 


6,180 


. 12,700 


19,000 


36,600 


58,400 


103,000 


211,000 


50 


1,390 


2,910 


5,480 


11,300 


16,900 . 


32,.5O0 


51,700 


91,500 


187.000 


60 


1,260 


2,640 


4,970 


10,200 


15,300 


29,400 


46,900 


82,900 


169.000 


70 


1,160 


2,430 


4.570 


9,380 


14,100 


27,100 


43,100 


76,300 


156,000 


80 


1,080 


2,260 


4,250 


8,730 


13.100 


. 25,200 


40,100 


70,900 


145.000 


90 


1,010 


2,120 


3,990 


8,190 


12,300 


23,600 


37,700 


66,600 


136,000 


100 


956 


2,000 


3.770 


7,730 


11,600 


22,300 


35,600 


62,900 


128,000 


125 


848 


1,770 


,3,340 


6,850 


10,300 


19,8(W 


31,500 


55,700 


114.000 


150 


768 


1,610 


3,020 


6,210 


9,300 


17,900 


28,600 


50,500 


103,000 


175 


706 


1.480 


2,780 


5,710 


8,560 


16,500 


26,300 


46,500 


94,700 


200 


657 


1,370 


2,590 


5,320 


7,960 


15,300 


24,400 


43,200 


88,100 


250 


582 


1,220 


2,290 


4,710 


7,060 


13,600 


21,700 


3f!,.300 


78,100 


m) 


528 


1,100 


2,080 


4,270 


6,400 


12,.3(K) 


19,600 


34,700 


70,800 


350 


486 


1,020 


1,910 


3,930 


5,880 


11, .300 


18,100 


31,900 


65,100 


400 


452 


945 


1,780 


3,650 


5,470 


10,5(K) 


16,800 


29,700 


60,600 


450 


424 


886 


1,670 


8,430 


.5,140 


9,890 


15,800 


27,900 


56,800 


500 


400 


837 


1,580 


3,240 


4,850 


9,340 


14,900 


26,300 


53,700 


550 


380 


795 


1,500 


3,070 


4,610 


8,870 


14.100 


25,000 


51,000 


600 


363 


759 


1,430 


2,930 


4,400 


8,460 


13,500 


23,900 


48.600 


650 


347 


726 


1,370 


2,810 


4,210 


8,110 


12.900 


22,800 


46,600 


700 


334 


698 


1.310 


2,700 


4,040 


7,790 


12,400 


21,900 


44,800 


730 


321 


672 


1,270 


2,600 


3,900 


7,500 


12.000 


21,100 


43,100 


800 


310 


649 


1.220 


2,510 


3,760 


7,240 


11,500 


20,400 


41,600 


850 


.300 


628 


1,180 


2,430 


3,640 


7,010 


11,200 


19,800 


40.300 


900 


291 


609 


1.150 ■ 


2,3t>0 


3,530 


6,800 


10,800 


19,200 


39,100 


950 


283 


.592 


1,110 


2,290 


3,4.30 


6.6(K) 


10,500 


18,600 


37.900 


1,000 


275 


575 


1,080 


2,230 


3,330 


6,420 


10,200 


18,100 


36,900 


1,100 


261 


546 


1,030 


2,110 


3,170 


6,100 


9,720 


17,200 


35,000 


1>200 


249 


521 


982 


2.020 


3,020 


5,820 


9,270 


16,400 


33,400 


1,300 


239 


4M 


940 


1,930 


2,890 


5,570 


8,880 


15,700 


32,000 


1,400 


229 


480 


903 


1,8.50 


2,780 


5,350 


8,530 


15,100 


,30,800 


1,500 


221 


462 


870 


1,790 


2,680 


5,160 


8,220 


14.500 


29,600 


1,600 


213 


446 


840 


1,730 


2,590 


4,980 


7,940 


14,000 


28,600 


1.700 


206 


432 


813 


1.670 


2,500 


4,820 


7,680 


13,600 


27,700 


1,800 


200 


419 


789 


1.620 


2,430 


4,670 


7,450 


13,200 


26,900 


1,900 


194 


407 


766 


1,570 


2,360 


4,540 


7,230 


12,800 


26,100 


2,000 


189 


395 


745 


1,530 


2,290 


4,410 


7,030 


12,400 


25,400 



Note: All table entries are rounded to 3 significant digits. 



189 



Table 12-30 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 12-30 Schedule 40 Metallic Pipe [NFPA Table 6.3(b)] 



Inlet Pressure: 



Pressure Drop: 



Specific Gravity: 



Undiluted Propane 



10.0 psi 



3.0 psi 



SPECIAL USK: Pipe Siring Between First Stasjc fHigh Pressure Kcgulator) and Second Staffc (I/>w Pressure Rej^ator) 



Pipe Size (in.) 



Nominal 




















In.<;ide: 


-^ 


»/4 


1 


VA 


m 


2 


m 


3 


4 


Actual: 


0.622 


0.824 


1.049 


1.380 


i.610 


2.067 


2.469 


3.068 


4.026 


Ijength (ft) 








Capacity in 


Thousands of Btu per Hour 








10 


5,890 


12,300 


23.200 


47,600 


71, .300 


1,37.000 


219,000 


387,000 


789,000 


20 


4,050 


8,460 


15,900 


,32,700 


49,000 


94,400 


150,000 


266,000 


543,000 


30 


.3,250 


6,790 


12,800 


26,300 


39,400 


75,800 


121,000 


214,000 


436,000 


40 


2,780 


5,810 


11,000 


22,500 


33,700 


64,900 


103,000 


183,000 


373,000 


50 


2,460 


.5,150 


9,710 


19,900 


29,900 


.57,500 


91,600 


162,000 


330,000 


60 


2,230 


4,670 


8,790 


18,100 


27,100 


52,1(» 


83,000 


147,000 


299,000 


70 


2,0.50 


4,300 


8,0<H) 


16,600 


24,900 


47,900 


76,400 


135,000 


275,<XK) 


80 


1,910 


4,000 


7,530 


15,500 


23,200 


44,600 


71,100 


126,000 


256,000 


90 


1,790 


3,750 


7,060 


14,500 


21,700 


41,800 


66,700 


118,000 


240,000 


100 


1,690 


3,540 


6,670 


13,700 


20,.500 


39,500 


63,000 


111,000 


227,000 


125 


1,500 


3,140 


5,910 


12,100 


18,200 


35,(K)0 


55,800 


98.700 


201,000 


150 


1,360 


2,840 


5,360 


11,000 


16,500 


31,700 


50.600 


89,400 


182,000 


175 


1,250 


2,620 


4,930 


10,100 


15,200 


29,200 


46,500 


82,300 


167,800 


200 


1,160 


2,430 


4,580 


9,410 


14,100 


27,200 


43,300 


76,500 


156,100 


250 


1,030 


2,160 


4,060 


S.S'IO 


12,500 


24,100 


38,400 


67,800 


138,400 


.%0 


9.35 


1,950 


3,680 


7,560 


11,300 


21,800 


.34,800 


6],.500 


125,400 


.^50 


860 


1,800 


3,.3go 


6,950 


10,400 


20,100 


.32,000 


.56,.500 


]1.5,.300 


400 


800 


1,670 


3,1.50 


6,470 


9,690 


18,700 


29,800 


,52,600 


I07,.300 


450 


751 


1,570 


2,960 


6,070 


9,090 


17,500 


27,900 


49,400 


100,700 


500 


709 


1,480 


2.790 


5,730 


8,590 


16,500 


26,400 


46,600 


95,100 


.550 


67.3 


1,410 


2,650 


5.450 


8,160 


15,700 


25,000 


44,300 


90,300 


<»() 


642 


1,.340 


2,5.30 


5,200 


7,780 


15,0(X) 


23,900 


42,200 


86,200 


650 


615 


1,290 


2,420 


4,980 


7,450 


14,400 


22,900 


40,.500 


82,.500 


700 


591 


1,240 


2,330 


4,780 


7,160 


13,800 


22,000 


38,900 


79,300 


750 


569 


1,190 


2,240 


4,600 


6,900 


13,300 


21,200 


37,400 


76,400 


800 


550 


1,150 


2,170 


4,450 


6,660 


12,800 


20,500 


36,200 


73,700 


850 


532 


1,110 


2,100 


4,300 


6,450 


12,400 


19,800 


35,000 


71, -m) 


900 


516 


1,080 


2,030 


4,170 


6,250 


12,000 


19,200 


33,900 


69,200 


950 


501 


1,050 


1,970 


4,050 


6,070 


11,700 


18,600 


32.900 


67,200 


1,000 


■ 487 


1,020 


1,920 


3,940 


5,900 


11,400 


18,100 


32,000 


65,400 


1,100 


46.3 


968 


1,820 


3,740 


5,610 


10,800 


17,200 


-30,400 


62,100 


1,200 


442 


923 


1,740 


3,570 


5,3.50 


10,300 


16,400 


29,000 


59,200 


1,300 


423 


884 


1,670 


3,420 


5,120 


9.870 


15,700 


27,800 


.56,700 


1,400 


406 


849 


1,600 


3,280 


4,920 


9,480 


15,100 


26,700 


54,500 


1,500 


391 


818 


1,540 


3,160 


4,740 


9,130 


14,600 


25,700 


52,.500 


1/jOO 


.378 


790 


1,490 


3,060 


4,580 


8,820 


14,100 


24,800 


50,700 


1,700 


.366 


765 


1,440 


2,9(» 


4,430 


8,530 


13.600 


24,000 


49,000 


1,800 


355 


741 


1,400 


2,870 


4,300 


8,270 


13,200 


2.3,.300 


47,600 


1,900 


.344 


720 


1,360 


2,780 


4,170 


8,040 


12,800 


22,600 


46,200 


2,000 


335 


700 


1,320 


2,710 


4,060 


7,820 


12,500 


22,000 


44,900 



Note; All table entries are rounded to 3 significant digits. 



190 



FUEL PIPING 



Table 12-31 



Table 12-31 Schedule 40 Metallic Pipe [NFPA Table 6.3(c)] 















Gas: 


Undiluted Prop 


ane 




Inlet Pressure: 


2.0 psi 




Pressure Drop; 


1.0 psi 




Spedfic Gravity: 


1.50 




Pipe Size (in.) 


Nomina!: 


V4 


% 


1 


VA 


m 


2 


214 


3 


4 


Actual ID: 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Length (ft) 








Capacity in 


Thousands of Btu per Hour 








10 


2,680 


5,590 


10,500 


21.600 


32,400 


62,400 


99,500 


176.000 


359,000 


20 


1,840 


3,850 


7.240 


14,900 


22,300 


42,900 


68,400 


121,000 


247,000 


30 


1,480 


3,090 


5,820 


11,<K»0 


17,9(K) 


34,.500 


54,900 


97,100 


198,000 


40 


1,260 


2,640 


4,980 


10,200 


15,300 


29,500 


47,000 


83,100 


170,000 


50 


1,120 


2.340 


4,410 


9,060 


13,600 


26.100 


41,700 


73,700 


150,000 


60 


1,010 


2,120 


4,000 


8,210 


12,300 


23,700 


37,7(K) 


66,700 


136,000 


70 


934 


1,950 


3,680 


7,550 


11,300 


21.800 


34,700 


61,400 


125,000 


80 


869 


1,820 


3,420 


7,020 


10,.500 


20,300 


32,300 


.57,100 


116,000 


90 


815 


1,700 


3,210 


6,590 


9,880 


19,000 


30,300 


33,600 


109,000 


100 


770 


1,610 


3,030 


6,230 


9,330 


18,000 


28,600 


50,600 


103,(M)0 


125 


682 


1,430 


2,690 


5,520 


8,270 


15,900 


25,400 


44,900 


91,500 


!50 


618 


1,290 


2,440 


5.000 


7,490 


14,400 


23,000 


40,700 


82,900 


175 


569 


1,190 


2,240 


4,600 


6,890 


13,300 


21,200 


37,400 


76,.30O 


200 


52<) 


1,110 


2,080 


4,280 


6,410 


12,300 


19,700 


,34,800 


71,0(K) 


250 


469 


981 


1,850 


3,790 


5,680 


10,900 


17,400 


30,800 


62,900 


3(K) 


425 


889 


1,670 


3,440 


5,150 


9,920 


15,8(K» 


27,900 


57.000 


350 


391 


817 


1.540 


3,160 


4,740 


9,120 


I4,5(K) 


25,700 


52,400 


400 


364 


760 


1,430 


2,940 


4.410 


8,490 


13,500 


23,900 


48,800 


'450 


341 


714 


1,340 


2,760 


4,130 


7,960 


12,700 


22,400 


45,800 


500 


322 


674 


1,270 


2,610 


3,910 


7.520 


12,000 


21,200 


43,200 


550 


306 


640 


1,210 


2,480 


3,710 


7,140 


ii,4(K> 


20,100 


41,100 


600 


292 


611 


1,130 


2,360 


3,540 


6,820 


10,900 


19,200 


39,200 


650 


280 


585 


1,100 


2,260 


3,390 


6,530 


10.400 


18,400 


37,500 


700 


269 


562 


1,060 


2,170 


3,260 


6.270 


9,990 


17,700 


36,000 


750 


259 


541 


1,020 


2,090 


3,140 


6,040 


9,6.30 


17,000 


34,700 


800 


250 


523 


985 


2,020 


3,030 


5.830 


9,300 


16,400 


33,500 


850 


242 


506 


933 


1,960 


2.930 


5,640 


9,000 


15,900 


32,400 


900 


235 


490 


924 


1,900 


2,840 


. 5,470 


8.720 


15,400 


31, .500 


950 


228 


476 


897 


1,840 


2,7«) 


5,310 


8,470 


15,000 


30,500 


1,000 


222 


463 


873 


1,790 


2,680 


5,170 


8,240 


14,600 


29,700 


1.100 


210 


440 


829 


1,700 


2,550 


4,910 


7,830 


13,800 


28,200 


1,200 


201 


420 


791 


1,620 


2,4.30 


4,mo 


7,470 


13,200 


26,900 


1,300 


192 


402 


7i>7 


1,550 


2,.330 


4,490 


7,1.50 


12,600 


25,8{H) 


1,400 


185 


386 


727 


1,490 


2,240 


4,310 


6,870 


12,100 


24,800 


1300 


178 


372 


701 


1,440 


2,160 


4,150 


6,620 


11,700 


23,900 


1,600 


172 


359 


677 


1,.390 


2,080 


4,010 


6,390 


11,.300 


23,000 


1,700 


166 


348 


655 


1,340 


2,010 


3,880 


6,180 


10,900 


22,300 


1,8(X> 


161 


337 


635 


1.300 


1,950 


3,760 


6,000 


10,600 


21,600 


1,900 


157 


327 


617 


1,270 


1,900 


3.650 


5.820 


10,300 


21,000 


2,000 


152 


318 


600 


1,230 


1,840 


3,5,50 


5,660 


10,000 


20,400 



Note: All table entries are rotinded to 3 significant digits. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



191 



Table 12-32 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 12-32 Schedule 40 Metallic Pipe [nfpa Table 6.3(d)] 





Gas: 


UndOutcd Propane 




Inlet Pressure: 


11.0in.w.c. 




Pressure Drop: 


0.5 in. w.c. 




Specific Gravity: 


1.50 



SPECL'VL L'5E: Pipe Siung Between Single or SecoLid Stage iLow PivisNiire Regulator) and Appliance 





Pipe Size (in.) 


Nominal 




















Inside: 


V4 


% 


I 


I'A 


154 


2 


254 


3 


4 


Actual: 


0.622 


0.824 


1.049 


1.380 


1.610 


2.067 


2.469 


3.068 


4.026 


Lei^ (ft) 








Capacity in 


Thousands of Blu per Hour 








10 


291 


608 


1,150 


2,350 


3,520 


6,790 


10,800 


19,100 


39,000 


20 


200 


418 


787 


1,620 


2,420 


4,660 


7,430 


13,100 


26,800 


30 


160 


336 


632 


1,300 


1,940 


3,750 


5,970 


10,600 


21,500 


40 


137 


287 


541 


1.110 


1,660 


3,210 


5,110 


9,030 


18,400 


50 


122 


255 


480 


985 


1,480 


2,840 


4,530 


8,000 


16,300 


60 


110 


231 


434 


892 


1,340 


2,570 


4,100 


7,250 


14,800 


80 


101 


212 


400 


821 


1,230 


2,370 


3,770 


6,670 


13,600 


100 


94 


197 


372 


763 


1,140 


2,200 


3,510 


6,210 


12,700 


125 


89 


185 


349 


716 


1,070 


2,070 


3,290 


5,820 


11,900 


150 


84 


175 


330 


677 


1,010 


1,9.50 


3,110 


5,5(W 


11,200 


175 


74 


155 


292 


600 


899 


1,730 


2.760 


4,880 


9,950 


200 


67 


140 


265 


543 


814 


1,570 


2,500 


4,420 


9,010 


2i30 


62 


129 


243 


.500 


749 


1,440 


2.300 


4.060 


8,290 


300 


58 


120 


227 


465 


697 


1,340 


2,140 


3,780 


7,710 


350 


51 


107 


201 


412 


618 


1,190 


1,900 


3..350 


6,840 


400 


46 


97 


182 


373 


560 


1,080 


1,720 


3,040 


6,190 


450 


42 


89 


167 


344 


515 


991 


1,580 


2,790 


5,700 


500 


40 


83 


156 


320 


479 


922 


1,470 


2,600 


5,300 


550 


37 


78 


146 


300 


449 


865 


1,380 


2,-440 


4,970 


600 


35 


73 


138 


283 


424 


817 


1,300 


2,300 


4,700 


650 


33 


70 


131 


269 


403 


776 


1,240 


2,190 . 


4,460 


700 


32 , 


66 


125 


257 


386 


741 


1,180 


2,090 


4,260 


750 


30 


64 


120 


246 


368 


709 


1,130 


2,000 


4,080 


800 


29 


61 


115 


236 


354 


681 


1,090 


1,920 


3,920 


850 


28 


59 


Ml 


227 


341 


656 


1,050 


1,850 


3,770 


?KK) 


27 


.57 


107 


220 


329 


634 


1,010 


1,790 


3,640 


950 


26 


55 


104 


213 


319 


613 


978 


1,730 


3,530 


1,0{K> 


25 


53 


100 


206 


309 


595 


948 


1,680 


3,420 


1,100 


25 


52 


97 


200 


300 


578 


921 


1,630 


3,320 


1,200 


24 


50 


95 


195 


292 


562 


895 


1,580 


3,230 


1,300 


23 


48 


90 


185 


277 


534 


850 


1,500 


3,070 


1,400 


22 


46 


86 


176 


264 


509 


811 


1,430 


2,930 


1,5TO 


21 


44 


82 


169 


253 


487 


777 


1,370 


2,800 


1,600 


20 


42 


79 


162 


243 


468 


746 


1,320 


2,690 


1,700 


19 


40 


76 


156 


234 


451 


719 


1,270 


2,590 


1,800 


19 


39 


74 


151 


226 


436 


694 


1,230 


2,.500 


1,900 


18 


38 


71 


146 


219 


422 


672 


1,190 


2,420 


2,000 


18 


37 


69 


142 


212 


409 


652 


1,150 


2,350 



Note: All table entries are rounded to ^ significant digits. 



192 



FUEL PIPING 



Table 12-33 



Table 12-33 Semi-Rigid Copper Tubing [NFPA Table 6.3(e)] 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
.NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Gas: 



Inlet Pressure: 



Pressure Drop: 



Specific Gravily; 



Undiluted Propane 



lO.Opsi 



1.0 psi 



SPKCIAI. CSE: Tube Sizing Benvocn First Stage (High Pressure Repihitor) and Second Stage (Low Pres&ure Rcgul&tor) 

Tube Size (in.) 





K&L: 


Vt 


% 


V4 


% 


V* 


1 


VA 


VA 


2 


Nominal: 
























ACR: 


% 


V4 


% 


% 


% 


m 


1% 


— 


— 


Outside: 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.S75 


1.625 


2.125 


Inside:" 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


513 


1,060 


2,150 


3,760 


5,330 


11.400 


20,500 


32,300 


67,400 


20 


352 


727 


1,480 


2,580 


3,670 


7,830 


14,100 


22,200 


46,300 


30 


283 


584 


1,190 


2,080 


2,940 


6,290 


11,300 


17,900 


37.200 


40 


242 


500 


1,020 


1.7S0 


2.520 


5,380 


9,690 


15.300 


31,800 


50 


215 


443 


901 


1,570 


2,230 


4,770 


8,590 


13,500 


28.200 


60 


194 


401 


816 


1,430 


2,020 


4,320 


7,780 


12,300 


25,600 


70 


179 


369 


751 


1.310 


1,860 


3,980 


7,160 


11,300 


23,500 


80 


166 


343 


699 


1,220 


1,730 


3,700 


6,660 


10,500 


21,900 


90 


156 


322 


655 


1,150 


1,630 


3,470 


6,250 


9.850 


20,500 


100 


147 


304 


619 


1,080 


1,540 


3,280 


5,900 


9.310 


19,400 


125 


131 


270 


549 


959 


1,360 


2,910 


5,230 


8,2.50 


17,200 


150 


118 


244 


497 


869 


1,230 


2,630 


4,740 


7,470 


15,600 


175 


109 


225 


■ 457 


799 


1,130 


2.420 


4,360 


6,880 


14,.300 


200 


101 


209 


426 


744 


1,060 


2,250 


4,060 


6,400 


13,300 


250 


90 


185 


377 


659 


935 


2,000 


3,600 


6,670 


11,800 


300 


81 


168 


342 


597 


847 


1,810 


3,260 


5,140 


10,700 


350 


75 


155 


314 


549 


779 


1,660 


3,000 


4,730 


9,840 


400 


70 


144 


292 


511 


725 


1,550 


2,790 


4,400 


9,160 


450 


65 


135 


274 


480 


680 


1,450 


2.620 


4,130 


8,590 


500 


62 


127 


259 


453 


643 


1,370 


2,470 


3,900 


8,120 


550 


59 


121 


246 


430 


610 


1,300 


2,330 


3,700 


7,710 


600 


56 


115 


235 


410 


582 


1,240 


2,240 


3,530 


7,350 


650 


54 


111 


225 


393 


558 


1,190 


2,140 


3,380 


7,040 


700 


51 


106 


216 


378 


536 


1,140 


2,060 


3,250 


6,770 


750 


50 


102 


208 


364 


516 


1.100 


1,980 


3,130 


6,520 


800 


48 


99 


201 


351 


498 


1,060 


1,920 


3,020 


6.290 


850 


46 


96 


195 


340 


482 


1,030 


1,850 


2,920 


6,090 


900 


45 


93 


189 


330 


468 


1,000 


1,800 


2,840 


5.910 


950 


44 


90 


183 


320 


454 


970 


1,750 


2,750 


5,730 


}xm 


42 


88 


178 


311 


442 


944 


1,700 


2,680 


5,580 


1,100 


40 


83 


169 


296 


420 


896 


1,610 


2,540 


5,300 


1,200 


38 


79 


161 


282 


400 


855 


1,540 


2,430 


5,050 


1,3<K) 


37 


76 


155 


270 


383 


819 


1,470 


2,320 


4,840 


1,400 


35 


73 


148 


260 


368 


787 


1,420 


2,230 


4,650 


1,500 


34 


70 


143 


250 


355 


758 


1,360 


2,150 


4,480 


1,«K) 


33 


68 


138 


241 


343 


732 


1,320 


2,080 


4.330 


1,700 


32 


66 


134 


234 


331 


708 


1,270 


2,010 


4,190 


1,800 


31 


64 


130 


227 


321 


687 


1,240 


1,960 


4,060 


1,900 


30 


62 


126 


220 


312 


667 


1.200 


1,890 


3,940 


2,000 


29 


60 


122 


214 


304 


648 


1,170 


1,840 


3,830 



Note: All table entries are rounded to 3 significant digits. 

*TabIe capacities are based on Type K copper tubing inside diiuiieter (shown) , which has the smallest inside 

diameter of the copper tubing products. 



193 



Table 12-34 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 12-34 Semi-Rigid Copper Tubing [NFPA Table 6.3(f)] 





Gas: 


Undiluted Propane 




Infet Pressure: 


11.0in.%v.c. 




Pressure Drop: 


0.5 in. w.c. 




Spedfic Gravity: 


1.50 



.SPr.CIAI. USK: Tube Siting livnt-ccn Single or Second Stage (Low Pressuiv Kcgulator) and Appliance 



Tube Size (in.) 



Nominal: 


K&L: 


'/* 


% 


V4 


Vs 


V* 


1 


VA 


114 


2 
























ACaR: 


% 


»/4 


% 


% 


% 


1V4 


1% 


— 


— 


Outside: 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside:' 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1.481 


1.959 


Lengtli (ft) 


Capacity in Thousands of Btu per Hour 


10 


45 


93 


188 


329 


467 


997 


1,800 


2,830 


5,890 


20 


31 


64 


129 


226 


321 


685 


1,230 


1,9.50 


4,050 


30 


25 


51 


104 


182 


258 


550 


991 


1,560 


3,250 


40 


21 


44 


89 


155 


220 


, 471 


848 


1,340 


2,780 


50 


19 


39 


79 


138 


195 


417 


752 


1,180 


2,470 


60 


17 


35 


71 


125 


177 


378 


681 


1,070 


2,240 


70 


16 


32 


66 


115 


163 


.348 


626 


988 


2,060 


80 


15 


30 


61 


107 


152 


324 


583 


919 


1,910 


90 


14 


28 


57 


100 


142 


.304 


547 


862 


1.800 


100 


13 


27 


54 


95 


134 


287 


517 


814 


1,700 


125 


11 


24 


48 


84 


119 


254 


458 


722 


1.500 


150 


10 


21 


44 


76 


108 


230 


415 


654 


1,360 


175 


NA 


20 


40 


70 


99 


212 


382 


602 


1,250 


200 


NA 


18 


37 


65 


92 


197 


355 


560 


1,170 


250 


NA 


16 


33 


58 


82 


175 


315 


496 


1,030 


300 


NA 


15 


30 


52 


74 


158 


285 


449 


936 


350 


NA 


14 


28 


48 


68 


146 


262 


414 


861 


400 


NA 


13 


26 


45 


63 


136 


244 


385 


801 


450 


NA 


12 


24 


42 


60 


127 


229 


361 


752 


500 


NA 


11 


23 


40 


56 


120 


216 


341 


710 


550 


NA 


11 


22 


38 


53 


114 


205 


324 


674 


600 


NA 


10 


21 


36 


51 


109 


196 


309 


6-43 


650 


NA. 


NA 


20 


34 


49 


104 


188 


296 


. 616 


700 


NA 


NA 


19 


33 


47 


100 


180 


284 


592 


750 


NA 


NA 


18 


32 


45 


96 


174 


274 


570 


800 


NA 


NA 


18 


31 


44 


93 


168 


264 


551 


850 


NA 


NA 


17 


30 


42 


90 


162 


256 


. 533 


900 


NA 


NA 


17 


29 


41 


87 


157 


248 


517 


950 


NA 


.NA 


16 


28 


40 


85 


153 


241 


502 


1,000 


NA 


NA 


16 


27 


39 


83 


149 


234 


488 


1,100 


NA 


NA 


15 


26 


37 


78 


141 


223 


464 


1,200 


NA 


NA 


14 


25 


35 


75 


135 


212 


442 


1,300 


NA 


NA 


14 


24 


34 


72 


129 


203 


423 


1,400 


NA 


NA 


13 


23 


32 


69 


124 


195 


407 


1,500 


NA 


NA 


1$ 


22 


31 


66 


119 


188 


392 


1,600 


NA 


NA 


12 


21 


30 


64 


115 


182 


378 


1,700 


NA 


NA 


12 


20 


29 


62 


112 


176 


366 


1,800 


NA 


NA 


11 


20 


28 


60 


108 


170 


355 


1,900 


NA 


NA 


11 


19 


27 


58 


105 


166 


845 


2,000 


NA 


NA 


11 


19 


27 


57 


102 


161 


335 



NA means a flow of less than 10,000 Btu/hr. 

Note: All table entries are rounded to S .significant digits. 

"Table capacities are based on Type K copper tubing in.side diameter (.shown), which has the smallest inside 

diameter of the copper tubing products. 



194 



FUEL PIPING 



Table 12-35 



Table 12-35 Semi-Rigid Copper Tubing [NFPA Table 6.3(g)] 

















Gas: 


Undiluted Propane 




Inlet Pressure: 


2.0 psi 




Pj^ssure Drop: 


1.0 psi 






Specific Gravity: 


1.50 




Tube Size (in.) 


Nominal: 


K&L: 


Vt 


n 


'A 


% 


% 


1 


VA 


m 


2 
























ACR: 


% 


V4 


% 


»/» 


% 


IH 


m 


— 


— 


Outside: 


0.375 


0.500 


0.625 


0.750 


0.875 


1.125 


1.375 


1.625 


2.125 


Inside:' 


0.305 


0.402 


0.527 


0.652 


0.745 


0.995 


1.245 


1,481 


1.959 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


413 


852 


1,730 


3,030 


4,300 


9,170 


16,500 


26,000 


54,200 


20 


284 


585 


1,190 


2.O80 


2,950 


6,310 


11,400 


17,900 


37,300 


30 


228 


470 


956 


1,670 


2,370 


5,060 


9,120 


14,400 


29,900 


40 


195 


402 


818 


1,430 


2,030 


4,330 


7,800 


12,300 


25,600 


50 


173 


356 


725 


1,270 


l.SOt) 


3,840 


6,920 


10,900 


22,700 


60 


157 


323 


657 


1,150 


1,630 


3,480 


6,270 


9,880 


20,()00 


70 


144 


297 


605 


1,060 


1.500 


3,200 


5,760 


9,090 


18.900 


m 


134 


276 


562 


983 


• 1,390 


2,980 


5,360 


8.450 


17,600 


90 


126 


259 


528 


922 


1,310 


2,790 


5.030 


7,930 


16,500 


100 


119 


245 


498 


871 


1,240 


2.640 


4,750 


7,490 


15,600 


J25 


105 


217 


442 


772 


1,100 


2,340 


4,210 


6,640 


13,800 


150 


95 


197 


400 


700 


992 


2,120 


3,820 


6,020 


12,500 


175 


88 


181 


368 


644 


913 


1,950 


3,510 


5,540 


11. .500 


200 


82 


168 


343 


599 


849 


1,810 


3,270 


5,150 


10,700 


250 


72 


149 


304 


531 


753 


1,610 


2,900 


4,560 


9,510 


300 


66 


135 


275 


481 


682 


1,460 


2,620 


4,140 


8,610 


350 


60 


124 


25S 


442 


628 


1,340 


2,410 


3,800 


7,920 


400 


56 


116 


235 


41] 


584 


1,250 


2,250 


3,540 


7,370 


450 


53 


109 


221 


386 


548 


1,170 


2,110 


3,320 


6,920 


500 


50 


103 


209 


365 


517 


1,110 


1,990 


3,140 


6,530 


550 


47 


97 


198 


346 


491 


1,050 


1,890 


2,980 


6.210 


600 


45 


93 


189 


330 


469 


1,000 


1,800 


2,840 


5,920 


650 


43 


89 


181 


316 


449 


959 


1,730 


2,720 


5,670 


700 


41 


86 


174 


304 


431 


921 


1,660 


2,620 


5,450 


750 


40 


82 


168 


293 


415 


888 


1,600 


2,520 


5,250 


800 


39 


80 


162 


283 


401 


857 


1,540 


2,430 


5,070 


850 


37 


77 


157 


274 


388 


829 


1,490 


2,350 


4,900 


900 


36 


75 


152 


265 


376 


804 


1,450 


2,280 


4,750 


950 


35 


72 


147 


258 


366 


781 


1,410 


2.220 


4,620 


1,000 


34 


71 


143 


251 


356 


760 


1,370 


2,160 


4,490 


1,100 


32 


67 


136 


238 


338 


721 


1,300 


2,050 


4,270 


1,200 


31 


64 


130 


227 


322 


688 


1,240 


1,950 


4,070 


1,300 


30 


61 


124 


217 


309 


659 


1,190 


1,870 


3,900 


1,400 


28 


59 


120 


209 


296 


633 


1,140 


1,800 


3,740 


1,500 


27 


57 


115 


201 


286 


610 


1,100 


1,730 


3,610 


1,600 


26 


55 


111 


194 


276 


589 


1,060 


1,670 


3.480 


1,700 


26 


53 


108 


188 


267 


570 


1,030 


1,620 


3,370 


1,800 


25 


51 


104 


182 


259 


553 


1,000 


1,570 


3,270 


1,900 


24 


30 


101 


177 


251 


537 


966 


1,520 


3,170 


2,000 


23 


48 


99 


172 


244 


522 


940 


1.480 


3,090 



Note: All table entries are rounded to 3 significant digits. 

*Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside 

diameter of the copper tubing products. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



195 



Table 12-36 -Table 12-37 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 12-36 Corrugated Stainless Steel Tubing (CSST) [NFPA Table 6.3(h)] 


















Gas: 


Undiluted Propane 




Inlet Pressure: 


I1.0in.w.c. 




Pressure Drop: 


0.5 in. w.c. 




Specific Gravity: 


1.50 




TubeS«e<EHD)* 


Flow Designation: 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 


Capacity in Thousands of Btu per Hour 


5 


72 


99 


181 


211 


355 


426 


744 


863 


1,420 


2,830 


.3,270 


5.780 


6,.550 


10 


50 


69 


129 


150 


254 


303 


521 


605 


971 


1,9^W 


2,320 


4,110 


4,6^10 


!,5 


39 


55 


104 


121 


208 


248 


422 


490 


775 


1,620 


1,900 


3,370 


3.790 


20 


34 


49 


91 


106 


183 


216 


365 


425 


661 


1,400 


1,650 


2,930 


3.290 


25 


30 


42 


82 


94 


164 


192 


325 


379 


583 


1.2,50 


1,480 


2,6.30 


2,940 


30 


28 


39 


74 


87 


151 


177 


297 


344 


528 


1,140 


1,350 


2.400 


2,680 


40 


23 


33 


64 


74 


131 


153 


256 


297 


449 


988 


1.170 


2,090 


2,3.30 


50 


20 


30 


58 


66 


118 


137 


227 


265 


397 


884 


1,050 


1,870 


2,080 


60 


19 


26 


53 


m 


107 


126 


207 


241 


359 


805 


961 


1,710 


1,900 


70 


17 


25 


49 


57 


99 


117 


19! 


222 


330 


745 


890 


1,590 


1,760 


80 


1.5 


23 


■15 


52 


94 


109 


178 


208 


307 


696 


833 


1,490 


1,6,50 


ao 


15 


22 


44 


50 


90 


102 


169 


197 


286 


656 


787 


1,400 


1.530 


100 


14 


20 


41 


47 


85 


98 


159 


186 


270 


621 


746 


1 ,330 


1.480 


150 


11 


15 


31 


36 


66 


75 


123 


143 


217 


506 


611 


1,090 


1.210 


2(K) 


9 


M 


28 


33 


60 


69 


112 


129 


183 


438 


.531 


948 


1,0.50 


250 


8 


12 


25 


30 


53 


61 


99 


117 


163 


390 


476 


8.50 


934 


300 


8 


11 


23 


26 


50 


57 


90 


107 


147 


3,57 


434 


777 


854 



*EHD = Equh'alent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between 

different tubing .sizes. The greater the value of EHD, the greater the gas capacity of the tubing. 

Notes: 

(J) Table includes losses for four 90 degree bends and two end fittings. Tubing runs wth larger numbers of 

bends and/or fittings shall be increa,sed by an equivalent length of tubing to the following equation: L= I3n, 

where £ is additional length (ft) of tubing and « is the number of additional titnngs and/or bends. 

(2) All table entries are rounded to 3 significant digits. 



Table 12-37 Corrugated Stainless Steel Tubing (CSST) [NFPA Table 6.3(i)3 























Gas: 


Undiluted 


Propane 






Inlet Pressure: 


2.0 psi 




Pressure Drop: 


1.0 psi 




Specific Gravity: 


1.50 




Tube Size (EH0)* 


Flow Bedgnation: 


13 


15 


18 


19 


23 


25 


30 


31 


37 


46 


48 


60 


62 


Length (ft) 










Cap 


arity in Thousands of 1 


Itu per Hov 


LT 








10 


426 


558 


927 


1,110 


1,740 


2,170 


4,100 


4,720 


7,1.30 


15,200 


16,800 


29,400 


34,200 


25 


262 


347 


.591 


701 


1,120 


1,380 


2,560 


2.950 


4,560 


9,5.50 


10,700 


18.800 


21,700 


SO 


2.38 


3! 6 


540 


640 


1,0.30 


1,270 


2,.330 


2,690 


4,180 


8,710 


9,790 


17,200 


19.800 


40 


203 


271 


469 


5.54 


896 


1,100 


2,010 


2,320 


3,630 


7,5.30 


8,500 


14,900 


17,200 


50 


181 


243 


420 


496 


806 


980 


1,790 


2,070 


3,260 


6,730 


7,610 


13,400 


15,400 


75 


147 


196 


344 


406 


663 


809 


1,460 


1,690 


2,680 


5,480 


6.230 


11.000 


12,600 


80 


140 


189 


333 


393 


ftl3 


768 


1,110 


1,630 


2,590 


5,300 


6,010 


10,(if)0 


12.200 


100 


124 


169 


298 


350 


578 


70,3 


1,260 


1,4.50 


2,330 


4,740 


5.410 


9,530 


10,900 


150 


101 


137 


245 


287 


477 


575 


1,020 


1.180 


1,910 


3,860 


4,430 


7.810 


8,890 


200 


86 


lis 


213 


248 


415 


.501 


880 


1,020 


1,660 


3,340 


3,840 


6,780 


7,710 


2.50 


77 


105 


191 


222 


373 


448 


785 


910 


1,490 


2,980 


3.410 


6,080 


6,900 


.300 


69 


96 


1.73 


203 


343 


411 


716 


829 


:l„360 


2,720 


3.1,50 


5,560 


6,300 


400 


60 


82 


151 


175 


298 


355 


616 


716 


1,160 


2,350 


2,730 


4,830 


5,460 


.500 


53 


72 


1.35 


158 


268 


319 


550 


6.38 


1,0.30 


2,100 


2,450 


4,3.30 


4,880 



*EHD = Equivaleiu Hydraulic Diameter, which is a measure of the relative hydraulic eflFiciency between 

different tubing sizes. The greater the value of EHD, the greater the giLS capacity of tlte tubing. 

Notes: 

(1) Table does not inchide efl'ecl of pressure drop across ihe line regulator. Where regulator loss exceeds 
'/4 psi (based on 13 in. w.c. oudet pressure), do not use this table. Consult with regulator manufacturer for 
pressure drops and capacity factors. lVes.sure drops acro,ss a regulator may rary with flow rate. 

(2) CIAUTION: (Capacities shown in table may exceed maximum capacity for a selected regulator. Consult 
with regnlator or tubing mantjfactiner for guidance. 

(3) Taliie includes losstis for four 90 degree bends and two end fittings. Tubing runs with latter number of 
bends and/or fittings shall be increa.sed by an equivalent: length of tubing according to the following equa- 
tion; L ~ 1 .3?}, where /, is additional |{::ngth (ft) of tubing and n is the runnber of additional fittings and/or 
bends. 

(4) All table entries are rounded to 3 significant digit.s. 



196 



FUEL PIPING 



Table 12-38 -Table 12-39 



Table 12-38 Corrugated Stainless Steel Tubing (CSST) [NFPA Table 6.3(j)] 























Gas: 


Undauted 


Propane 






Inlet Pressure: 


5.0 psi 




Pressure Drop: 


3.5 psi 




Spcdlic GraviQi 


1.50 




Tube Size (EHD)* 


Flow Designation: 


n 


15 


18 


19 


23 


25 


30 


31 


37 


46 1 48 


60 


S2 


Length (ft) 


Capacitj' in Tfaousands of Btti per H»ur 


10 


826 


1,070 


1,710 


2,060 


3,150 


4,000 


7,830 


8,950 


13,100 


28.600 


31,200 


54,400 


63,800 


25 


509 


664 


1,090 


1,310 


2,040 


2.550 


4,860 


5,600 


8,4,00 


18,(K» 


19,900 


34,700 


40,400 


30 


461 


603 


999 


1,190 


1.870 


2,340 


4,4.30 


5,100 


7,680 


16,400 


18,200 


31,700 


36,900 


40 


m> 


520 


867 


1,0.30 


1,630 


2,030 


3.820 


4,400 


6,680 


14,200 


15,800 


27.600 


32,000 


50 


352 


463 


777 


926 


1,400 


1,820 


3,410 


3,930 


S.SSW 


12,700 


14,100 


24,7(XI 


28,(M)0 


75 


284 


376 


637 


737 


1,210 


1,490 


2,770 


3,190 


4,920 


10,300 


11,600 


20,300 


23,400 


80 


275 


363 


6iS 


731 


1,170 


1,450 


2,680 


3,090 


4,770 


9,990 


11,200 


19,600 


22,700 


too 


243 


324 


5.53 


656 


1,0.50 


l„300 


2,390 


2,760 


4,280 


8,9.30 


10,000 


17,«K) 


20,300 


150 


196 


262 


453 


535 


866 


1,060 


1.940 


2,240 


3,510 


7,270 


8,210 


14,400 


16,600 


200 


160 


226 


393 


464 


755 


923 


1,680 


. 1,930 


3,050 


6,2«»0 


7,130 


12,500 


14,400 


250 


150 


202 


352 


415 


679 


828 


1,490 


1,730 


2,740 


5,620 


6,390 


M,200 


12,900 


SOO 


136 


183 


322 


379 


622 


757 


1,360 


1,570 


2,510 


5.120 


5,8-10 


10,300 


11.700 


400 


117 


158 


279 


328 


542 


657 


1,170 


1,360 


2,180 


4,430 


5,070 


8,920 


10,200 


500 


104 


140 


251 


294 


488 


,589 


i.050 


1,2 !0 


1,930 


3,960 


4,540 


8,000 


9,1 10 



*EHD = Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efFiciency between 

different tubing sizes. Tlie greater the vakie of EUD, the greater the gas capacity of the tubing. 

Notes: 

(1) Table does not include effect of pressure drop across tlw; line regulator. Where regulator loss exceeds 
V4 p.si (based on 13 in. w.c. outlet pressure), do not use this table. Consult with regulator manufacturer for 
pres.sure drops and capacity factors. Pressure drops across a regulator may vaiy with flow rate. 

(2) CAUTION: Ciipacities shown in table may exceed maximum capacity for a selected regulator. Conauh 
with regulator or itihing manufacturer for guidance. 

(S) Table includes losses for four 90 degree bends and two end fittings. Tubing riu>s-4vith larger number of 
()ends and/or fittings .shatl be increased by an equivalent length of tubing according to the following equa- 
tion: L = l.3n, where L is additional length (ft) of tubing and ;* is the number of additional fittings and/or 
bends. 
(4) All table entries are routided to 3 significant digits. 



Table 12-39 


Polyethylene Plastic Pipe [nfpa Table 6.3(k)] 














Gas: 


Undiluted Propane 




Inlet Pressure: 


11.0 in. w.c. 




Pressure Drop: 


0.5 in. w.c. 




Specific Gravity: 


1.50 




Pipe Size (in.) 


Nominal OD: 


•A 


% 


1 


IV4 


I'/S 


2 


Designation: 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDRH.OO 


Actual ID: 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


I.ength (ft) 


Capacity in lliousands of Btu per Hour 


10 


340 


680 


1,230 


2,130 


3,210 


5,770 


20 


233 


468 


844 


1,460 


2.210 


3,970 


SO 


187 


.375 


677 


1,170 


1,770 


,3,180 


40 


160 


.321 


580 


1,000 


!,.520 


2,730 


50 


142 


285 


514 


890 


1,340 


2,420 


60 


129 


258 


466 


807 


1,220 


2,190 


70 


119 


2.37 


428 


742 


1,120 


2,010 


80 


110 


221 


398 


690 


1,040 


1,870 


90 


103 


207 


374 


&48 


978 


1,7(» 


100 


98 


196 


353 


612 


924 


i,fm 


125 


87 


173 


313 


542 


819 


1,470 


1.50 


78 


1.57 


284 


491 


742 


1,330 


175 


72 


145 


261 


4.52 


683 


1,2.30 


200 


67 


135 


243 


420 


635 


1,140 


250 


60 


119 


215 


373 


563 


1,010 


300 


54 


108 


19.5 


338 


510 


916 


360 


50 


99 


179 


311 


469 


843 


4.00 


46 


92 


167 


289 


436 


784 


450 


43 


87 


157 


271 


409 


736 


500 


41 


82 


148 


2.56 


.387 


695 



Note: All table entries are rounded to 3 significant digits. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA- 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



197 



Table 12-40 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA. 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA, 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Table 12-40 Polyethylene Plastic Pipe [NFPA Table 6.3(1)] 













Gas: 


Undiluted Propane 






Inlet Pressure: 


2.0 psi 




Pressure Drop: 


1.0 psi 




Specific Gravity: 


1.50 




Pipe Size (in.) 


Nominal OD: 


Mt 


Y4 


1 


IVa 


\^A 


2 


Designation: 


SDR 9.33 


SDR 11.0 


SDR 11.00 


SDR 10.00 


SDR 11.00 


SDR 11.00 


Actual ID: 


0.660 


0.860 


1.077 


1.328 


1.554 


1.943 


Length (ft) 


Capacity in Thousands of Btu per Hour 


10 


3,130 


6,260 


11,300 


19,600 


29,500 


53.100 


20 


2,150 


4,300 


7,760 


1,3,400 


20,300 


36,5(K) 


30 


1,730 


3.450 


6,230 


10,800 


16,300 


29.300 


40 


1,480 


2.9()0 


5,330 • 


9,240 


14,000 


25,100 


50 


1,310 


2,620 


4,730 


8,190 


12,400 


22,200 


60 


1,190 


2,370 


4,280 


7,420 


11.200 


20,100 


70 


1,090 


2.180 


3,940 


6,830 


1O,.30O 


18,500 


80 


1.010 


2,030 


3,670 


6,350 


9,590 


17,200 


90 


952 


1,910 


3,440 


5,960 


9.000 


16,200 


100 


899 


1,800 


3,250 


5,630 


8,.500 


15,300 


125 


797 


1,600 


2,880 


4,990 


7,530 


13,500 


150 


722 


1,450 


2,610 


4,520 


6,8.30 


12,300 


175 


664 


1.330 


2,400 


4,160 


6,280 


11,300 


200 


618 


1,240 


2,230 


3,870 


5,840 


10,500 


250 


548 


1,100 


1,980 


3,430 


5,180 


9.300 


300 


496 


994 


1,790 


3,110 


4,690 


8,430 


350 


457 


914 


1,650 


2,860 


4,320 


7.760 


400 


425 


851 


1,530 


2,660 


4,020 


7,220 


450 


3il9 


798 


1,440 


2,500 


3,770 


6,770 


500 


.^77 


754 


1,360 


2.360 


3,560 


6,390 


550 


358 


716 


1,290 


2,240 


3,380 


6,070 


600 


341 


683 


1,230 


2,140 


3,220 


5,790 


650 


327 


654 


1,180 


2,040 


3,090 


5,550 


700 


314 


628 


1,130 


1,960 


2,970 


5,.330 


750 


302 


605 


1,090 


1.890 


2,860 


5,140 


800 


292 


585 


1,050 


1,830 


2,760 


4,960 


850 


283 


566 


1,020 


1,770 


2,670 


4,800 


900 


274 


549 


990 


1,710 


2,590 


4,650 


950 


266 


5.33 


961 


1,670 


2,.520 


4,.520 


1,000 


259 


518 


935 


1,620 


2,450 


4,400 


1.100 


246 


492 


888 


1,540 


2,320 


4,170 


1,200 


2.34 


470 


847 


1,470 


2,220 


3,980 


1,300 


225 


450 


811 


1,410 


2,120 


3,810 


1,400 


216 


432 


779 


1.350 


2,040 


3.660 


1,500 


208 


416 


751 


1,300 


1,960 


3,530 


1,600 


201 


402 


725 


1,260 


1,900 


3,410 


1,700 


194 


389 


702 


1,220 


1,840 


3,300 


1,800 


188 


377 


(580 


1,180 


1,780 


3,200 


1,900 


183 


366 


661 


1,140 


1,730 


3,110 


2,000 


178 


356 


643 


1,110 


1,680 


3,020 



Note: All table entries are rounded to 3 significant digits. 



198 



FUEL PIPING 



Table 12-41 



Table 12-41 Polyethylene Plastic Tubing 

[NFPA Table 6.3(m)] 





Gas: 


Undiluted Propane 




Inlet Pressure: 


II.O in. w.c. 




Pressure Drop: 


0.5 in. w.c 




Specific Gravity: 


1.50 




Plastic Tubing Size <CTS) (in.) 


Nominal OD: 


V^ 


3/4 


Designadon: 


SDR 7.00 


SDR 11.00 


Actual ID: 


0.445 


0.927 


Length (ft) 


Capaci^ in Thousands of Btu per Hour 


10 


121 


828 


20 


83 


569 


30 


67 


457 


40 


57 


391 


60 


51 


347 


60 


46 


314 


70 


42 


289 


80 


39 


269 


90 


37 


252 


100 


35 


238 


125 


31 


211 


150 


28 


191 


175 


26 


176 


200 


24 


164 


225 


22 


154 


250 


21 


145 


275 


20 


138 


300 


19 


132 


350 


18 


121 


400 


16 


113 


450 


15 


106 


500 


15 


100 



Note: All table entries are rounded to 3 significant digits. 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



199 



UNIFORM PLUMBING CODE 



200 



CHAPTER 13 

HEALTH CARE FACILITIES AND MEDICAL GAS AND VACUUM SYSTEMS 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



Part I - Special Requirements for 
Health Care Facilities. 

1301.0 Application. 

1301.1 Construction and equipment requirements 
shall be applied only to new construction and new 
equipment, except as modified in individual 
chapters. Only the altered, renovated, or modernized 
portion of an existing system or individual 
component shall be required to meet the installation 
and equipment requirements stated in this standard. 
If the alteration, renovation, or modernization 
adversely impacts existing performance requirements 
of a system or component, additional upgrading 
shall be required. [NFPA 99: 1.3.2] 

1301.2 This chapter applies to the special fixtures 
and systems in health care facilities and to the special 
plumbing requirements for such facilities. Other 
plumbing in such facilities shall comply with other 
applicable sections of this code. 

1 301 .3 This chapter shall not apply to breathing air 
replenishment (BAR) systems. 

1302.0 Medical Gas and Vacuum Piping Systems 
- Installation Requirements. 

The installation of medical gas and vacuum piping 
systems shall be in accordance with the requirements 
of this chapter and /or the appropriate standards 
adopted by the Authority Having Jurisdiction. For 
additional standards see Table 14-1. 

1302.1 The installation of individual components 
shall be made in accordance with the instructions of 
the manufacturer. Such instructions shall include 
directions and information deemed by the 
manufacturer to be adequate for attaining proper 
operation, testing, and maintenance of the medical 
gas and vacuum systems. Copies of the manu- 
facturer's instructions shall be left with the system 
owner. [NFPA 99: 5.1.10.6.9.1, 5.1.10.6.9.2, 5.1.10.6.9.3] 

1 302.2 The installation of medical gas and vacuum 
systems shall be made by qualified, competent 
technicians who are experienced in making such 
installations. Installers of medical gas and vacuum 
systems shall meet the requirements of ANSI/ASSE 
Standard 6010, Professional Qualification Standard for 
Medical Gas and Vacuum System Installers. [NFPA 99: 
5.1.10.6.11.1,5.1.10.6.11.2] 



1 302.3 Brazing shall be performed by individuals 
who are qualified under the provisions of Section 
1311.6. [NFPA 99: 5.1.10.6.11.3] 

1302.4 Prior to any installation work, the installer of 
medical gas and vacuum piping shall provide and 
maintain documentation on the job site for the 
qualification of brazing procedures and individual 
brazers that is required under Section 1311.6. 
[NFPA 99: 5.1.10.6.11.4] 

1303.0 Protrusions from Walls. 

1303.1 Drinking fountain control valves shall be 
flush-mounted or fully recessed when installed in 
corridors or other areas where patients may be 
transported on a gurney, bed, or wheelchair. 

1303.2 Piping exposed in corridors and other areas 
where subject to physical damage from the move- 
ment of carts, stretchers, portable equipment, or 
vehicles shall be protected. [NFPA 99: 5.1.10.6.2.1] 

1304.0 Psychiatric Patient Rooms. 

Piping and drain traps in psychiatric patient rooms 
shall be concealed. Fixtures and. fittings shall be 
resistant to vandalism. [NFPA 101] 

1305.0 Locations for Ice Storage. 

Ice makers or ice storage containers shall be located 
in nursing stations or similarly supervised areas to 
minimize potential contamination. [See NFPA 101] 

1306.0 Sterilizers. 

1306.1 General. The requirements of this section 
apply to sterilizers and bedpan steamers. Such 
equipment shall be installed in accordance with this 
code and the manufacturer's installation instructions. 

1306.2 Indirect Waste Connections. 

Waste drainage from sterilizers and bedpan steamers 
shall be connected to the sanitary drainage system 
through an airgap in accordance with this chapter 
and Chapter 8. The size of indirect waste piping shall 
not be less than the size of the drain connection on 
the fixture. Each such indirect waste pipe shall not 
exceed fifteen (15) feet (4,572 mm) in length and shall 
be separately piped to a receptor. Such receptors 
shall be located in the same room as the equipment 
served. Except for bedpan steamers, such indirect 
waste pipes shall not require traps. A trap having a 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



201 



1306.2-1310.5 



UNIFORM PLUMBING CODE 



NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 
NFPA 



minimum, seal of three (3) inches (80 mim) shall be 
provided in the indirect waste pipe for a bedpan 
steamer. 

1307.0 Vapor Vents and Stacks for Sterilizers. 

1307.1 General. When a sterilizer has provision for 
a vapor vent and such a vent is required by the 
manufacturer, the vent shall be extended to the 
outdoors above the roof. Sterilizer vapor vents shall 
be installed in accordance with the manufacturer's 
instructions and shall not be connected to any 
drainage system vent. 

1308.0 Aspirators. 

1308.1 See Section 603.4.9, Water Inlets to Water 
Supplied Aspirators. Provisions for aspirators or 
other watersupplied suction devices shall be 
installed only with the specific approval of the 
Authority Having Jurisdiction. Where aspirators are 
used for removing body fluids, they shall include a 
collection container to collect liquids and solid 
particles. Aspirators shall indirectly discharge to the 
sanitary drainage system through an airgap in 
accordance with Chapter 8. The potable water 
supply to an aspirator shall be protected by a 
vacuum, breaker or equivalent backflow protection 
device in accordance with Section 603.0. 

Part II — Medical Gas and Vacuum Systems. 

1309.0 Application. 

1309.1 The provisions herein shall apply to the 
installation, testing, and verification of medical gas 
and vacuum piping in hospitals, clinics, and other 
health care facilities. 

1309.2 The purpose of this chapter is to provide 
requirements for the installation, testing, and 
verification of medical gas and medical vacuum 
systems, from the central supply system to the 
station outlets or inlets. 

1 309.3 Wherever the terms medical gas or vacuum 
occur, the provisions shall apply to all piped systems 
for oxygen, nitrous oxide, medical air, carbon 
dioxide, helium, medical-surgical vacuum, waste 
anesthetic gas disposal, and mixtures thereof. 
Wherever the name of a specific gas or vacuum 
service occurs, the provision shall apply only to that 
gas. [NFPA 99: 5.1.1.2] 

1309.4 This chapter does not apply to portable 
compressed gas systems. 

1309.5 This chapter does not apply to: 

(A) Cylinder and container management, 
storage, and reserve requirements. 



(B) Gas central supply and bulk supply systems, 
except as addressed in this chapter. 

(C) Electrical connections and requirements. 

(D) Motor requirements and controls. 

(E) Systems having nonstandard operating 
pressures, except as addressed in this chapter. 

(F) Waste anesthetic gas disposal (WAGD) 
systems. 

(G) Surface-mounted medical gas rail systems 

1 309.6 The requirements of this chapter shall not be 
interpreted to conflict with the requirements of 
NFPA 99 Standard for Health Care Facilities. For 
requirements of portions of medical gas and medical 
vacuum systems not addressed in this chapter or 
medical gas and medical vacuuin systems beyond 
the scope of this chapter refer to NFPA 99 Standard 
for Health Care Facilities. 

1309.7 An existing system that is not in strict 
compliance with the provisions of the standard 
(Code) shall be permitted to be continued in use as 
long as the Authority Having Jurisdiction has 
determined that such use does not constitute a 
distinct hazard to life. [NFPA 99 4-1.4] (Same as the 
2002 edition of NFPA 99: 5.1.1.3.) 

1310.0 Definitions. 

1310.1 Building Supply - The pipe from the source 
of supply to a building or structure. 

1310.2 Critical Care Area - Those special care 
units, intensive care units, coronary care units, 
angiography laboratories, cardiac catheterization 
laboratories, delivery rooms, operating rooms, 
postanesthesia recovery rooms, emergency 
departments, and similar areas in which patients are 
intended to be subjected to invasive procedures and 
connected to line-operated, patient-care-related 
electrical appliances. [NFPA 99: 3.3.135.2] 

1310.3 General Care Areas - General care areas are 
patient bedrooms, examining rooms, treatment 
rooms, clinics, and similar areas in which it is 
intended that the patient will come in contact with 
ordinary appliances such as a nurses-call system, 
electric beds, examining lamps, telephones, and 
entertainment devices. [NFPA 99: 3.3.135.1] 

1310.4 Manifold - A device for connecting outlets of 
one or more gas cylinders to the central piping 
system for that specific gas. [NFPA 99: 3.3.103] 

1310.5 Medical Air - For purposes of this standard, 
medical air is air supplied from cylinders, bulk 
containers, medical air compressors, or has been 
reconstituted from oxygen USP and oil-free, dry 
nitrogen NF. Medical air shall be required to have 
the following characteristics: 



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202 



HEALTH CARE FACILITIES AND 
MEDICAL GAS AND VACUUM SYSTEMS 



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(1) Be supplied from cylinders, bulk containers, 
medical air compressor sources, or be 
reconstituted from oxygen USP and oil-free 
dry nitrogen NF. 

(2) Meet the requirements of medical air USP. 

(3) Have no detectable liquid hydrocarbons. 

(4) Have less than 25 ppm gaseous hydrocarbons. 

(5) Have equal to or less than 5 mg/m^ of 
permanent particulates sized 1 micron or 
larger in the air at normal atmospheric 
pressure. [NFPA 99: 3.3.106, 5.1.3.5.1] 

1310.6 Medical Gas - Gas used in a medical 
facility, including oxygen, nitrous oxide, carbon 
dioxide, helium, medical air, and mixtures of these 
gases. Standards of purity apply. 

1310.7 Medical Gas System - Complete system 
consisting of a central supply system (manifold, 
bulk, or compressors), including control equipment 
and piping extending to station outlets at the points 
where medical gases may be required. 

1310.8 Medical Vacuum System - See 1310.19, 
Vacuum System - Level 1. 

1310.9 Nitrogen, NF (Oil-Free, Dry) (Nitrogen for 
Brazing and Testing) - Nitrogen complying, as a 
minimum, with oil-free, dry nitrogen NF. [NFPA 99: 

NFPA I 3.3.120.1] 

1310.10 Patient Care Area - Any portion of a health 
care facility wherein patients are intended to be 
examined or treated. [NFPA 99: 3.3.138] 

1310.11 Purge, Flow - The removal of oxygen from 
a system by oil-free dry nitrogen during brazing. 

1310.12 Purge, System - The removal of nitrogen 
from a system with the medical gas required for that 
system. 

1310.13 SOFM - Standard cubic feet per minute. [NFPA 
99: 3.3.159] 

1310.14 Special Hazard Area - An area such as a 
kitchen or electrical switch-gear room. 

1310.15 Station Inlet - An inlet point in a medical- 
surgical piped vacuum distribution system at which 
the user makes connections and disconnections. 
[NFPA 99: 3.3.171] 

1310.16 Station Outlet - An inlet point in a piped 
medical/surgical vacuum distribution system at 
which the user makes connections and 
disconnections. [NFPA 99: 3.3.168] 

1310.17 Use Point - A room or area of a room 
where medical gases are dispensed to a single 
patient for medical purposes. A use point is 
permitted to be comprised of a number of station 
outlets of different gases. [NFPA 99: 3.3.175] 



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1310.5-1311.1 

1310.18 User Outlet - See Station Outlet. 

1310.19 Vacuum System - Level 1 - A system 
consisting of central vacuum-producing equipment 
with pressure and operating controls, shutoff valves, 
alarm warning systems, gauges, and a network of 
piping extending to and terminating with suitable 
station inlets at locations where patient suction could 
be required. [NFPA 99: 3.3.91] 

1310.20 Valve, Isolation - A valve that isolates one 
piece of equipment from another. 

1310.21 Valve, Riser - A valve at the base of a 
vertical riser that isolates that riser. 

1310.22 Valve, Service - A valve serving horizontal 
piping extending from a riser to a station outlet or 
inlet. 

1310.23 Valve, Source - A single valve at the 
source that controls a number of units that make up 
the source. 

1310.24 Valve, Zone - A valve that controls the gas 
or vacuum to a particular area. 

1310.25 Waste Anesthetic Gas Disposal - The 

process of capturing and carrying away gases vented 
from the patient breathing circuit during the normal 
operation of gas anesthesia or analgesia equipment. 
[NFPA 99: 3.3.178] 

1311.0 General Requirements. 

1311.1 Oxygen Compatibility - Tubes, valves, 
fittings, station outlets, and other piping components 
in medical gas systems shall have been cleaned for 
oxygen service by the manufacturer prior to 
installation in accordance with CGA 4.1, Cleaning 
Equipment for Oxygen Service, except that fittings shall 
be permitted to be cleaned by a supplier or agency 
other than the manufacturer. [NFPA 99: 5.1.10.1.1] 

1311.1.1 Components include but are not 
limited to containers, valves, valve seats, 
lubricants, fittings, gaskets, and interconnecting 
equipment including hose. Easily ignitable 
materials should be avoided. 

Compatibility involves both combustibility 
and ease of ignition. Materials that burn in air 
will burn violently in pure oxygen at normal 
pressure and explosively in pressurized oxygen. 
Also, many materials that do not bum in air will 
do so in pure oxygen, particularly under 
pressure. Metals for containers and piping have 
to be carefully selected, depending on service 
conditions. The various steels are acceptable for 
many applications, but some service conditions 
can call for other materials (usually copper or its 
alloys) because of their greater resistance to 
ignition and lower rate of combustion. 



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1311.1 -1311.6 



UNIFORM PLUMBING CODE 



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Similarly, materials that can be ignited in air 
have lower ignition energies in oxygen. Many 
such materials can be ignited by friction at a 
valve seat or stem packing or by adiabatic 
compression produced when oxygen at high 
pressure is rapidly introduced into a system 
initially at low pressure. 

1311.1.2 Materials used in central supply 
systems shall meet the following requirement: 

In those portions of systems intended to 
handle oxygen or nitrous oxide at gauge 
pressures of less than 2,070 kPa (300 psi), 
material construction shall be compatible with 
oxygen under the temperatures and pressures to 
which the components can be exposed in the 
containment and use of oxygen, nitrous oxide, 
mixtures of these gases, or mixtures containing 
more than 23.5 percent oxygen. [NFPA 99: 
5.1.3.4.3 (2)] 

1311.2 Certification of medical gas and medical 
vacuum systems shall conform to the requirements 
of Section 1328.0 of this code, the Authority Having 
Jurisdiction, and NFPA 99 Standard for Health Care 
Facilities section 5.1.12. [NFPA 99: 5.1.12]. 

1 31 1 .3 Prior to any installation work, the installer of 
medical gas and vacuum piping shall provide and 
maintain documentation on the job site for the 
qualification of brazing procedures and individual 
brazers that is required under Section 1311.6. [NFPA 
99: 5.1.10.6.11.4] 

1 31 1 .3.1 Each length of tube shall be delivered 
plugged or capped by the manufacturer and 
kept sealed until prepared for installation. 
Fittings, valves, and other componients shall be 
delivered sealed, labeled, and kept sealed until 
prepared for installation. [NFPA 99: 5.1.10.1.2 
and 5.1.10.1.3] 

1 31 1 .4 All medical gas and medical vacuum systems 
shall be supplied from a source consisting of at least 
two units - primary and secondary, e.g., a manifold 
consisting of two cylinder banks with at least two 
cylinders in each bank, a minimum of two air 
compressors, or a minimum of two vacuum pumps. 
However, two supply pipelines are not required. 

1311.5 Health Care Organization personnel shall be 
permitted to install piping systems if all the 
requirements of this chapter are met during 
installation. [NFPA 99: 5.1.10.6.11.5] 

1 31 1 .6 Brazing procedures and brazer performance 
for the installation of medical gas and vacuum 
piping shall be qualified in accordance with either 
Section IX, Welding and Brazing Qualifications, of the 
ASME Boiler and Pressure Vessel Code, or AWS 



B2.2, Standard for Brazing Procedure and Performance 
Qualifications, both as modified below. [NFPA 99: 
5.1.10.6.12.1] 

1311.6.1 Brazers shall be qualified by visual 
examination of the test coupon followed by 
sectioning. [NFPA 99: 5.1.10.6.12.2] 

1311.6.2 The Brazing Procedure Specification 
(BPS) shall address cleaning, joint clearance, 
overlap, internal purge gas purge gas flow rate, 
and filler metal. [NFPA 99: 5.1.10.6.12.3] 

1311.6.3 The brazing procedure specification 
and the record of brazer performance 
qualification shall document filler metal used, 
cleaning, joint clearance, overlap, internal purge 
gas, and flow rate during brazing of coupon, 
and the absence of internal oxidation in the 
completed coupon. [NFPA 99: 5.1.10.6.12.4] 

1311.6.4 Brazing procedures qualified by a 
technically competent group or agency shall be 
permitted under the following conditions: 

(1) The brazing procedure specification and 
the procedure qualification record 
meets the requirements of this standard. 

(2) The employer obtains a copy of both the 
brazing procedure specification and the 
supporting qualification records from 
the group or agency and signs and dates 
these records, thereby accepting 
responsibility for the qualifications that 
were performed by the group or agency. 

(3) The employer qualifies at least one 
brazer following each brazing procedure 
specification used. [NFPA 99: 5.1.10.6.12.5] 

1311.6.5 An employer shall be permitted to 
accept brazer qualification records of a previous 
employer under the following conditions: 

(1) The brazer has been qualified following 
the same or an equivalent procedure 
that the new employer uses. 

(2) The new employer obtains a copy of the 
record of brazer performance 
qualification tests from the previous 
employer and signs and dates these 
records, thereby accepting responsibility 
for the qualifications performed by the 
previous employer. [NFPA 99: 5.1.10.6.12.6] 

1311.6.6 Performance qualifications of brazers 
shall remain in effect indefinitely unless the 
brazer does not braze with the qualified 
procedure for a period exceeding six months, or 
there is a specific reason to question the ability 
of the brazer. [NFPA 99: 5.1.10.6.12.7] 



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204 



HEALTH CARE FACILITIES AND 
MEDICAL GAS AND VACUUM SYSTEMS 

1312.0 Plan Review. 

1312.1 Before any medical gas or medical vacuum 
system is installed or altered in any hospital, 
medical facility, or clinic, duplicate plans and 
specifications shall be filed with the Authority 
Having Jurisdiction. Approval of the plans shall be 
obtained prior to issuance of any permit by the 
Authority Having Jurisdiction. 

1312.2 Plans and specifications shall show the 
following, in detail: 

1312.2.1 Plot plan of the site, drawn to scale, 
indicating the location of existing or new 
cylinder storage areas, property lines, 
driveways, and existing or proposed buildings. 

1312.2.2 Piping layout of the proposed piping 
system or alteration, including alarms, valves, 
origin of gases, and user outlets/inlets. The 
demand and loading of any piping, existing or 
future, shall also be indicated. 

1 31 2.2.3 Complete specification of materials. 

1312.3 Plans and specifications submitted to the 
Authority Having Jurisdiction shall clearly indicate 
the nature and extent of the work proposed and shall 
show in detail that such work will conform to the 
provisions of this code. 

1312.4 A record of as-built plans and valve 
identification records shall remain on the site at 
all times. 

1313.0 System Performance. 
NFPA 1313.1 Required Operating Pressures. All medical 

NFPA ■ • •* 

NFPA gas and medical vacuum systems shall be capable of 
NFPA delivering service in the pressure ranges listed in Table 
NFPA 13-1. [NFPA 99: Table 5.1.11] 

1313.2 AAinimum Flow Rates. All medical gas and 
medical vacuum systems shall be capable of 
supplying the flow rates listed in Table 13-2. 

1313.3 Minimum Station Outlets/Inlets. Station 
outlets and inlets for medical gas and medical vacuum 
systems shall be provided as listed in Table 13-3. 

1314.0 Required Pipe Sizing. 

1314.1 Where the maximum demand for each 
medical gas or vacuum system and the maximum 
length of piping between the source equipment and 
the most distant station outlet/inlet do not exceed the 
values in Table 13-6, the size of pipe of each section of 
the system shall be determined using Tables 13-4 and 
13-6. The size for systems beyond the range of Table 
13-6 shall be determined by using the methods set 
forth in Section 1314.3 of this chapter. 



1312.0-1315.2 

1314.2 To determine the size of each section of pipe 
in any system within the range of Table 13-6, 
proceed as follows: 

1314.2.1 Measure the length of the pipe from 
the source equipment location to theinost 
remote station inlet/outlet on the system. 

1314.2.2 In Table 13-6, select the column 
showing that distance, or the next longer 
distance if the table does not give the exact 
length. 

1 31 4.2.3 Starting at the most remote outlet/inlet, 
find in the vertical column just selected the 
medical gas or vacuum demand for that 
inlet/outlet. If the exact figure of demand is not 
shown, choose the next larger figure below iii the 
column. 

1314.2.4 Opposite this demand figure, in the 
first column at the left in Table 13-6, will be 
found the correct size of pipe. 

1314.2.5 Using this same vertical column, 
proceed in a similar manner for each section of 
pipe serving this inlet/outlet. For each section of 
pipe, determine the total gas or vacuum demand 
supplied by the section, using Table 13-4. 

1314.2.6 Size each section of branch piping not 
previously sized by measuring the distance from 
the source equipment location to the most 
remote inlet /outlet in that branch, and follow 
the procedures of Sections 1314.2.2, 1314.2.3, 
1314.2.4, and 1314.2.5. 

Note: 

Size branch piping in the order of the distance from 
the source location, begirming with the most distant 
outlet not previously sized. 

1314.3 For conditions other than those covered by 
Section 1314.1 of this section, such as longer runs of 
greater gas or vacuum demands, the size of each gas 
or vacuum piping system shall be determined by 
standard engineering methods acceptable to the 
Authority Having Jurisdiction, and each isystem shall 
be so designed that the total pressure drop or gain 
between the source equipment and any inlet/ outlet 
will not exceed the allowable pressures shown in 
Table 13-1. 

1315.0 Workmanship. 

1315.1 All design, construction, and workmanship 
shall be in conformity with accepted engineering 
practices and shall meet the requirements of this code. 

1315.2 Cracks, holes, or other imperfections in 
materials shall not be concealed by welding, brazing, 
or soldering, or by using paint, wax, tar, or other 
leak-sealing or repair agents. 



205 



1315.3-1316.6 



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1 31 5.3 Burred ends of all tubing shall be deburred 
using a deburring tool to the full bore of the tube, 
and all chips shall be removed. 

1316.0 Materials. The provisions of this section 
apply to the field-installed piping for the distribution 
of medical piped gases. 

1316.1 Tubes, valves, fittings, station outlets, and 
other piping components in medical gas systems 
shall have been cleaned for oxygen service by the 
manufacturer prior to installation in accordance 
with CGA 4.1, Cleaning Equipment for Oxygen Service, 
except that fittings shall be permitted to be cleaned 
by a supplier or agency other than the nianu- 
facturer. [NFPA 99: 5.1.10.1.1] 

1316.2 Each length of tube shall be delivered 
plugged or capped by the manufacturer and kept 
sealed until prepared for installation. Fittings, 
valves, and other components shall be delivered 
sealed, labeled, and kept sealed until prepared for 
installation. [NFPA 99: 5.1.10.1.2, 5.1.10.1.3] 

1 31 6.3 Tubes shall be hard-drawn seamless copper 
ASTM B 819 medical gas tube. Type L, except that 
where operating pressures are above a gauge 
pressure of 1,275 kPa (185 psi). Type K shall be used 
for sizes larger than DN80 (NPS 3) (3-1/8 in. CD.). 

ASTM B 819 medical gas tube shall be identified 
by the manufacturer's markings "OXY," "MED," 
"OXY/MED," "OXY/ACR," or "ACR/MED" in blue 
(Type L) or green (Type K). [NFPA 99: 5.1.10.1.4, 
5.1.10.1.5] 

Piping for vacuum systems shall be constructed 
of any of the following: 

(1) Hard-drawn seamless copper tube 

(a) ASTM B 88, Standard Specification for 
Seamless Copper Water Tube, copper tube 
(Types K, L, M). 

(b) ASTM B 280, Standard Specification for 
Seamless Copper Tubing for Air Condition- 
ing and Refrigeration Field Service, copper 
ACR tube. 

(c) ASTM B 819, Standard Specification for Seam- 
less Copper Tube for Medical Gas Systems, 
copper medical gas tubing (T)qpe K or L). 

(2) Stainless steel tube [NFPA 99: 5.1.10.2.1] 

Piping systems shall be designed and sized to 
deliver the required flow rates at the utilization 
pressures. 

Mains and branches in medical gas-piping 
systems shall be not less than DN15 (NPS 1/2) (5/8 
in. CD.) size. 

Mains and branches in medical-surgical vacuum 
systems shall be not less than DN20 (NPS 3/4) (7/8 
in. CD.) size. 



Drops to individual station outlets and inlets shall 
be not less than DN15 (NPS 1/2) (5/8 in. CD.) size. 

Runouts to alarm panels and connecting tubing 
for gauges and alarm devices shall be permitted to 
be DN8 (NPS 1/4) (3/8 in. CD.) size. [NFPA 99: 
5.1.10.10.1.1-5.1.10.10.1.5] 

1316.4 Turns, offsets, and other changes in direction 
in welded or brazed medical gas and vacuimi piping 
shall be made with wrought-copper capillary fittings 
complying with ASME B16.22, Wrought Copper and 
Copper Alloy Solder-Joint Pressure Fittings, or 
brazed fittings complying with ASME B16.50, 
Wrought Copper and Copper Alloy Braze-Joint 
Pressure Fittings. 

1316.4.1 Cast-copper alloy fittings shall not be 
permitted. 

1316.4.2 Branch connections in vacuum piping 
systems shall be permitted to be made using 
mechanically formed, drilled, and extruded tee- 
branch connections that are formed in accordance 
with the tool manufacturer's instructions and 
brazed. [NFPA 99: 5.1.10.3.1, 5.1.10.3.2, 5.1.10.3.3, 
5.1.10.5.8 (4)-(7)] 

1316.5 The following special fittings shall be 
permitted to be used in lieu of brazed joints: 

(1) Memory-metal couplings having temperature 
and pressure ratings joints not less than that 
of a brazed joint. 

(2) Listed or approved metallic gas tube fittings 
that, when made up, provide a permanent 
joint having the mechanical, thermal, and 
sealing integrity of a brazed joint. 

(3) Dielectric fittings where required by the 
manufacturer of special medical equipment 
to electrically isolate the equipment from the 
piping distribution system. 

(4) AxiaUy swaged, elastic strain preload fittings 
providing metal to metal seal having pressure 
and temperature ratings not less than that of 
a brazed joint and, when complete, are 
permanent and nonseparable. 

1316.6 The following joints shall be prohibited 
throughout medical gas and vacuum distribution 
pipeline systems: 

(1) Flared and compression-type connections, 
including connections to station outlets and 
inlets, alarm devices, and other components. 

(2) Other straight-threaded connections, including 
imions. 

(3) The use of pipe-crimping tools to permanently 
stop the flow. 

131 6.6.1 Threaded joints in medical gas and 
vacuum distribution piping shall meet the 
following requirements: 



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HEALTH CARE FACILITIES AND 
MEDICAL GAS AND VACUUM SYSTEMS 

(1) Be limited to connections to pressure/ 
vacuum indicators, alarm devices, and 
source equipment. 

(2) Be tapered pipe threads complying with 
ANSI Bl.20.1, Pipe Threads, General 
Purpose. 

(3) Be made up with polytetrafluoroethylene 
(such as Teflon^'^) tape or other thread 
sealant recoinmended for oxygen 
service, with the sealant applied to the 
male threads only. [NFPA 99: 5.1.10.5.8, 
5.1.10.5.9 and 5.1.10.4] 

1316.7 New or replacement shutoff valves shall be 
as follows: 

(1) Quarter turn, full ported ball type. 

(2) Brass or bronze construction. 

(3) Have extensions for brazing. 

(4) Have a handle indicating open or closed. 

(5) Consist of three pieces permitting in-line 
serviceability. [NFPA 99: 5.1.4.3] 

1316.8 Soldered joints in copper Level 3 vacuum and 
Level 3 gas-powered systems piping shall be made in 
accordance with ASTM B 828, Making Capillary Joints by 
Soldering of Copper and Copper Alloy Tube and Fittings, 
using a lead-free solder filler metal containing not more 
than 0.2 percent lead by volume. [NFPA 99: 5.3.10.5] 

1317.0 Cleaning for Medical Gas Piping Systems. 

1317.1 The interior surfaces of tube ends, fittings, and 
other components that were cleaned for oxygen service 
by the manufacturer, but become contaminated prior 
to being installed, shall be permitted to be recleaned 
on-site by the installer by thoroughly scrubbing the 
interior surfaces with a clean, hot water-alkaline 
solution, such as sodium carbonate or trisodium 
phosphate 450 g to 11 L (1 lb. to 3 gal.) of potable water 
and thoroughly rinsing them with clean, hot potable 
water. Other aqueous cleaning solutions shall be 
permitted to be used for on-site recleaning permitted 
above, provided that they are as recommended in 
CGA Pamphlet G-4.1, Cleaning Equipment for Oxygen 
Service, and are listed in CGA Pamphlet 02-PIR, 
Directory of Cleaning Agents for Oxygen Service. [NFPA 
99: 5.1.10.5.3.10 and 5.1.10.5.3.11] 

1317.2 Material that has become contaminated 
internally and is not clean for oxygen service shall 
not be installed. [NFPA 99: 5.1.10.5.3.12] 

1318.0 Installation of Piping. 

1318.1 Piping shall be protected against freezing, 
corrosion, and physical damage. 



1316.6-1318.4 

Piping exposed in corridors and other areas 
where subject to physical damage from the 
movement of carts, stretchers, portable equipment, 
or vehicles shall be protected. 

Piping underground within buildings or 
embedded in concrete floors or walls shall be 
installed in a continuous conduit. [NFPA 99: 
5.1.10.6.2, 5.1.10.6.2.1, 5.10.6.2.2] 

1318.2 Piping risers shall be permitted to be 
installed in pipe shafts if protected from physical 
damage, effects of excessive heat, corrosion, or 
contact with oil. 

Piping shall not be installed in kitchens, elevator 
shafts, elevator machine rooms, areas with open 
flames, electrical service equipment over 600 volts, 
and areas prohibited under NFPA 70, National 
Electrical Code/except for the following locations: 

(1) Room locations for medical air compressor 
supply systems and medical-surgical vacuum 
pump supply systems. 

(2) Room locations for secondary distribution 
circuit panels and breakers having a maximum 
voltage rating of 600 volts. 

. Medical gas piping shall be permitted to be 
installed in the same service trench or tunnel with 
fuel gas lines, fuel oil lines, electrical lines, steam 
lines, and similar utilities provided that the space is 
ventilated (naturally or mechanically) and the 
ambient temperature around the medical gas piping 
is limited to 130°F (54°C ) maximum. 

Medical gas piping shall not be located where 
subject to contact with oil, including a possible 
flooding area in the case of a major oil leak. [NFPA 
99: 5.1.10.10.3] 

1 31 8.3 Buried piping outside of buildings shall be 
installed below the local level of frost penetration. 
[NFPA 99: 5.1.10.6.5] 

1318.4 The installation procedure for underground 
piping shall protect the piping from physical damage 
while being backfilled. 

If imderground piping is protected by a conduit, 
cover, or other enclosure, the following requirements 
shall be met: 

(1) Access shall be provided at the joints for 
visual inspection and leak testing. 

(2) The conduit, cover, or enclosure shall be self- 
draining and not retain groundwater in 
prolonged contact with the pipe. 

Buried piping that will be subject to surface 
loads shall be buried at a depth that will protect the 
piping and its enclosure from excessive stresses. 
[NFPA 99: 5.1.10.6.5.4] 

The minimum backfilled cover above the top of 
the pipe or its enclosure for buried piping outside of 



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207 



1318.4-1319.1 



UNIFORM PLUMBING CODE 



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buildings shall be 36 inches (900 mm), except that the 
minimum cover shall be permitted to be reduced to 
18 inches (450 mm) where physical damage is 
otherwise prevented. 

Trenches shall be excavated so that the pipe 
enclosure has firm, substantially continuous bearing 
on the bottom of the trench. 

Backfill shall be clean and compacted so as to 
protect and uniformly support the pipe enclosure. 

A continuous tape or marker placed immediately 
above the enclosure shall clearly identify the pipeline 
by specific name. 

A continuous warning means shall also be 
provided above the pipeline at approximately one- 
half the depth of bury. 

Where underground piping is installed through 
a wall sleeve, the ends of the sleeve shall be sealed to 
prevent the entrance of groundwater into the 
building. [NFPA 99: 5.1.10.6.5 - 5.1.10.6.10] 

1318.5 Hose and flexible connectors, both metallic 
and nonmetallic, shall be no longer than necessary 
and shall not penetrate or be concealed in walls, 
floors, ceilings, or partitions. Flexible connectors, 
metallic or nonmetallic, shall have a minimum burst 
pressure, with a gauge pressure of 6,895 kPa (1,000 
psi). [NFPA 99: 5.1.10.6.7] 

1318.6 Where a positive-pressure medical gas- 
piping distribution system, originally used or 
constructed for the use at one pressure and for one 
gas, is converted for operation at another pressure or 
for another gas, all provisions of NFPA 5.1.10 shall 
apply as if the system were new. [NFPA 99: 
5.1.10.6.10.1] 

A vacuum system shall not be permitted to be 
converted for use as a gas system. [NFPA 99: 
5.1.10.6.10.2] 

1318.7 Piping exposed in corridors and other areas 
where subject to physical damage from the 
movement of carts, stretchers, portable equipment, or 
vehicles shall be protected. [NFPA 99: 5.1.10.6.2.1] 

1318.8 Piping shall be supported from the building 
structure in accordance with MSS Standard Practice 
SP-69, Piping Hangers and Supports - Selection and 
Application.[NFFA 99: 5.1.10.6.4.1] 

Hangers and supports shall comply with MSS 
Standard Practice SP-58, Pipe Hangers and Supports - 
Materials, Design, and Manufacture. [NFPA 99: 
5.1.10.6.4.2] 

Hangers for copper tube shall have a copper finish 
and be sized for copper tube. [NFPA 99: 5.1.10.6.4.3] 

In potentially damp locations, copper tube hangers 
or supports that are in contact with tiie tube shall be 
plastic-coated or otherwise be insulated from the tube. 
[NFPA 99: 5.1.10.6.4.4] 

Maximum support spacing shall be in 
accordance with Table 13-7. [NFPA 99: Table 
5.1.10.6.4.5] 



1318.9 Where required, medical gas and vacuum 
piping shall be seismically restrained against 
earthquakes in accordance with the applicable 
building code. [NFPA 99 5.1.10.6.4.6] Seismic 
considerations shall conform to the requirements of 
this code and the Authority Having Jurisdiction. 

1318.10 Two or more medical gas-piping systems 
shall not be tntercoimected for testing or any other 
reason. Leak testing shall be accomplished by 
separately charging and testing the individual piping 
system. [NFPA 99: 5.1.10.6.8.1-2] 

1318.11 Piping shall be labeled by stenciling or 
adhesive markers that identify the patient medical 
gas, the support gas, or vacuum system, and include: 

(1) The name of the gas/vacuum system or the 
chemical symbol per NFPA 99: Table 5.1.11. 

(2) The gas or vacuum system color code per 
NFPA 99: Table 5.1.11. 

(3) Where positive-pressure gas piping systems 
operate at pressures other than the standard 
gauge pressure in NFPA 99 Table 5.1.11, the 
pipe labeling shall include the operating 
pressure in addition to the nan\e of the gas. 
[NFPA 99: 5.1.11.1.1] 

1319.0 Joints. This section sets forth the require- 
ments for pipe joint installation for positive-pressure 
medical gas systems. 

1319.1 Brazed joints shall be made using a brazing 
alloy that exhibits a melting temperature in excess of 
1,000°F (538°C) to retain the integrity of the piping 
system in the event of fire exposure. [NFPA 99: 
5.1.10.5.1.1] 

Brazed tube joints shall be the socket type. 
[NFPA 99: 5.1.10.5.1.2] 

Filler metals shall bond with and be 
metallurgically compatible with the base metals 
being joined. [NFPA 99: 5.1.10.5.1.3] 

Filler metals shall comply with ANSI/AWS 
A.5.8, Specification for Brazing Filler Metal. [NFPA 99: 
5.1.10.5.1.4] 

Copper-to-copper joints shall be brazed using a 
copper-phosphorus or copper-phosphorus-silver 
brazing filler metal (BCuP series) without flux. 
[NFPA 99: 5.1.10.5.1.5] 

Flux shall only be used when brazing dissimilar 
metals, such as copper and bronze or brass, using a 
silver (BAg series) brazing filler material. [NFPA 99: 
5.1.10.5.4.1] 

Joints to be brazed in place shall be accessible for 
necessary preparation, assembly, heating, filler 
application, cooling, cleaning, and inspection. [NFPA 
99: 5.1.10.5.1.7] 



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HEALTH CARE FACILITIES AND 
MEDICAL GAS AND VACUUM SYSTEMS 

1319.2 Tube ends shall be cut square using a sharp 
tubing cutter to avoid deforming the tube. [NFPA 99: 
5.1.10.5.2.1] 

The cutting wheels on tubing cutters shall be 
free from grease, oil, or other lubricant not suitable 
for oxygen service. [NFPA 99: 5.1.10.5.2.2] 

The cut ends of the tube shall be deburred with a 
sharp, clean deburring tool, taking care to prevent 
chips from entering the tube. [NFPA 99: 5.1.10.5.2.3] 

1319.3 The interior surfaces of tubes, fittings, and 
other components that are cleaned for oxygen service 
shall be stored and handled to avoid contamination 
prior to assembly and brazing. [NFPA 99: 5.1.10.5.3.1] 

The exterior surfaces of tube ends shall be 
cleaned prior to brazing to remove any surface 
oxides. [NFPA 99: 5.1.10.5.3.2] 

When cleaning the exterior surfaces of tube 
ends, no matter shall be permitted to enter the tube. 
[NFPA 99: 5.1.10.5.3.3] 

If the interior surfaces of fitting sockets become 
contaminated prior to brazing, they shall be 
recleaned for oxygen in accordance with NFPA 99 
5.1.10.5.3.10 and be cleaned for brazing with a clean, 
oil-free wire brush. [NFPA 99: 5.1.10.5.3.4] 

Clean, nonshedding, abrasive pads shall be used 
to clean the exterior surfaces of tube ends. [NFPA 99: 
5.1.10.5.3.5] 

The use of steel wool or sand cloth shall be 
prohibited. [NFPA 99: 5.1.10.5.3.6] 

The cleaning process shall not result in grooving 
of the surfaces to be joined. [NFPA 99: 5.1.10.5.3.7] 

After being abraded, the surfaces shall be wiped 
using a clean, lint-free white cloth. [NFPA 99; 
5.1.10.5.3.8] 

Tubes, fittings, valves, and other components 
shall be visually examined internally before being 
joined, to verify that they have not become 
contaiivinated for oxygen service and that they are free 
of obstructions or debris. [NFPA 99: 5.1.10.5.3.9] 

The interior surfaces of tube ends, fittings, and 
other components that were cleaned for oxygen 
service by the manufacturer, but become 
contaminated prior to being installed, shall be 
permitted to be recleaned on-site by the installer by 
thoroughly scrubbing the interior surfaces with a 
clean, hot water-alkaline solution, such as sodium 
carbonate or trisodium phosphate 450 g to 11 L (1 lb. 
to 3 gal.) of potable water and thoroughly rinsing 
them with clean, hot potable water. [NFPA 99: 
5.1.10.5.3.10] 

Other aqueous cleaning solutions shall be 
permitted to be used for on-site recleaning permitted 
in NFPA 99:5.1.10.5.3.10, provided that they are as 



1319.2- 1319.6 

recommended in CGA Pamphlet G-4.1, Cleaning 
Equipment for Oxygen Service, and are listed in CGA 
Pamphlet 02-DIR, Directory of Cleaning Agents for 
Oxygen Service. [NFPA 99: 5.1.10.5.3.11] 

Material that has become contaminated 
internally and is not clean for oxygen service shall 
not be installed. [NFPA 99: 5.1.10.5.3.12] 

Joints shall be brazed within eight hours after 
the surfaces are cleaned for brazing. [NFPA 99: 
5.1.10.5.3.13] 

1319.4 Flux shall only be used when brazing 
dissimilar metals such as copper and bronze or brass, 
using a silver (BAg series) brazing filler metal. 
[NFPA 99: 5.1.10.5.4.1] 

Surfaces shall be cleaned for brazing in 
accordance with Section 1319.3. [NFPA 99: 5.1.10.5.4.2] 

Flux shall be applied sparingly to minimize 
contamination of the inside of the tube with flux. 
[NFPA 99: 5.1.10.5.4.3] 

The flux shall be applied and worked over the 
cleaned surfaces to be brazed using a stiff bristle 
brush to ensure complete coverage and wetting of 
the surfaces with flux. [NFPA 99: 5.1.10.5.4.4] 

Where possible, short sections of copper tube 
shall be brazed onto the noncopper component and 
the interior of the subassembly shall be cleaned of 
flux prior to installation in the piping system. [NFPA 
99: 5.1.10.5.4.5] 

On joints DN20 (NFS 3/4) (7/8 in. O.D.) size 
and smaller, flux-coated brazing rods shall be 
permitted to be used in lieu of applying flux to the 
surfaces being joined. [NFPA 99: 5.1.10.5.4.6] 

1319.5 Tube ends shall be inserted fully into the 
socket of the fitting. [NFPA 99: 5.1.10.5.6.1] 

Where flux is permitted, the joint shall be heated 
slowly until the flux has liquefied. [NFPA 99: 
5.1.10.5.6.2] 

After flux is liquefied, or where flux is not 
permitted to be used, the joint shall be heated quickly 
to the brazing temperature, taking care not to overheat 
the joint. [NFPA 99: 5.1.10.5.6.3] 

Techniques for heating the joint; applying the 
brazing filler metal; and making horizontal, 
vertical, and large-diameter joints shall be as stated 
in sections on Applying Heat and Brazing and 
Horizontal and Vertical Joints in Chapter VII, 
Brazed Joints, in the CDA Copper Tube Handbook. 
[NFPA 99: 5.1.10.5.6.4] 

1 31 9.6 When being brazed, joints shall be continuously 
purged with oil-free, dry nitrogen NF to prevent the 
formation of copper oxide on the inside surfaces of 
the joint. [NFPA 99: 5.1.10.5.5.1] 



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209 



1319.6-1320.2 



UNIFORM PLUMBING CODE 



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The source of the purge gas shall be monitored, 
and the installer shall be audibly alerted when the 
source content is low. [NFPA 99: 5.1.10.5.5.2] 

The purge gas flow rate shall be controlled by 
the use of a pressure regulator and flow meter or 
combination thereof. [NFPA 99: 5.1.10.5.5.3] 

Pressure regulators alone shall not be used to 
control purge gas flow rates. [NFPA 99: 5.1.10.5.5.4] 

In order to ensure that all ambient air has been 
removed from the pipeline prior to brazing, an 
oxygen analyzer shall be used to verify the 
effectiveness of the purge. The oxygen analyzer shall 
read below 1 percent oxygen concentration before 
brazing is to begin. [NFPA 99: 5.1.10.5.5.5] 

During and after installation, openings in the 
piping system shall be kept sealed to maintain a 
nitrogen atmosphere within the piping to prevent 
debris or other contaminants from entering the 
system. [NFPA 99: 5.1.10.5.5.6] 

While a joint is being brazed, a discharge 
opening shall be provided on the opposite side of the 
joint from where the purge gas is being introduced. 
[NFPA 99: 5.1.10.5.5.7] 

The flow of purge gas shall be maintained until 
the joint is cool to the touch. [NFPA 99: 5.1.10.5.5.8] 

After the joint has cooled, the purge discharge 
opening shall be sealed to prevent contamination of 
the inside of the tube and maintain the nitrogen 
atmosphere within the piping system. [NFPA 99: 
5.1.10.5.5.9] 

The final connection of new piping to an 
existing, in-use pipeline shall be permitted to be 
made without the use of a nitrogen purge. [NFPA 99: 
5.1.10.5.5.10] 

After a final cormection in a positive-pressure 
medical gas pipeline is made without a nitrogen 
purge, an outlet in the immediate downstream zone 
of the affected portions of both the new and existing 
in-use piping shall be tested in accordance with 
NFPA 99: 5.1.12.3.9, Final Tie-in Test. [NFPA 99: 
5.1.10.5.5.11] 

When using the autogenous orbital welding 
process, joints shall be continuously purged inside 
and outside with inert gas(es) in accordance with 
the qualified welding procedure. [NFPA 99: 
5.1.10.5.5.12] 

1 31 9.7 After brazing, the outside of all joints shall 
be cleaned by washing with water and a wire brush 
to remove any residue and permit clear visual 
inspection of the joint. [NFPA 99: 5.1.10.5.7.1] 

Where flux has been used, the wash water shall 
be hot. [NFPA 99: 5.1.10.5.7.2] 



Each brazed joint shall be visually inspected 
after cleaning the outside surfaces. [NFPA 99: 
5.1.10.5.7.3] 

Joints exhibiting the following conditions shall 
not be permitted: 

(1) Flux or flux residue (when flux or flux- 
coated BAg series rods are used with 
dissimilar metals). 

(2) Base metal melting or erosion. 

(3) Unmelted filler metal. 

(4) Failure of the filler metal to be clearly visible 
all the way around the joint at the interface 
between the socket and the tube. 

(5) Cracks in the tube or component. 

(6) Cracks in the brazed filler metal. 

(7) Failure of the joint to hold the test pressure 
under the installer-performed initial 
pressure test (1329.10) and standing pressure 
test (Section 1329.11). [NFPA 99: 5.1.10.5.7.4 ] 

Brazed joints that are identified as defective 
under conditions 1319.7(2) or (5) shall be replaced. 
[NFPA 99: 5.1.10.5.7.5] 

Brazed joints that are identified as defective 
under Sections 1319.7(1), (3), (4), (6), or (7) shall be 
permitted to be repaired, except that no joint shall be 
reheated more than once before being replaced. 
[NFPA 99: 5.1.10.5.7.6] 

1320.0 Valves - Requirements, Locations, and 
Labeling. 

1320.1 General Requirements. Shutoff valves 
accessible to other than authorized personnel shall 
be installed in valve boxes with frangible or 
removable windows large enough to permit manual 
operation of valves. [NFPA 99: 5.1.4.2.1] 

Shutoff valves for use in certain areas, such as 
psychiatric or pediatric, shall be permitted to be 
seciired with the approval of the Authority Having 
Jurisdiction to prevent inappropriate access. [NFPA 
99: 5.1.4.2.2] 

1320.1.1 Where valves are concealed in any 
enclosure, the door or entry to the enclosure 
shall be identified and color coded with the type 
of gas service installed, as described in Section 
1323.0. Enclosures shall be of sufficient size to 
permit valve operation. Valve handles in the off 
position shall prevent closure of the access panel 
or door. 

1320.2 In-line shutoff valves intended for use to 
isolate piping for maintenance or modification shall 
meet the following requirements: 

(1) Be located in a restricted area. 

(2) Be locked or latched open. 



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HEALTH CARE FACILITIES AND 
MEDICAL GAS AND VACUUM SYSTEMS 

(3) Be identified in accordance with Section 
1323. [NFPA 99: 5.1.4.9.1] 

1 320.3 Shutoff valves provided for the connection of 
future piping shall meet the following requirements: 

(1) Be locked in a restricted area. 

(2) Be locked or latched closed. 

(3) Be identified in accordance with Section 
1323. [NFPA 99: 5.1.4.10] 

1320.3.1 Future connection valves shall be 
labeled as to gas content. [NFPA 99: 5.1.4.10.1] 

1 320.3.2 Downstream piping shall be closed 
with a brazed cap with tubing allowance for 
cutting and rebrazing. [NFPA 99: 5.1.4.10.2] 

1320.3.3 A zone valve shall be located 
immediately outside each vital life-support, 
critical care, and anesthetizing location in 
each medical gas and/or vacuum line, and 
located so as to be readily accessible in an 
emergency. [NFPA 99: 5.1.4.8.7] 

1320.3.4 All gas-delivery columns, hose reels, 
ceiling tracks, control panels, pendants, 
booms, or other special installations shall be 
located downstream of the zone valve. [NFPA 
99: 5.1.4.8.7.1] 

1320.3.5 Zone valves shall be so arranged that 
shutting off the supply of gas to any one 
operating room or anesthetizing location will 
not affect the others. [NFPA 99: 5.1.4.8.7.2] 

1320.4 Source Valve. A shutoff valve shall be 
placed at the immediate connection of each source 
system to the distribution piping to permit the entire 
source, including all accessory devices (such as hair 
dryers, final line regulators, etc.), to be isolated from 
the facility. [NFPA 99: 5.1.4.4] 

1320.4.1 The source valve shall be located in the 
immediate vicinity of the source equipment. 
[NFPA 99: 5.1.4.4.1] 

1320.4.2 The source valve shall be labeled in 
accordance with Section 1323.0, Source Valve for 
the (Source Name). [NFPA 99: 5.1.4.4.2, 5.1.11.2.3] 

1 320.5 Main Valve. A shutoff valve shall be provided 
in the main supply line inside of the building, except 
where one or more of the following conditions exist: 

(1) The source and source valve are located 
inside the building served. 

(2) The source system is physically mounted to 
the waU of the building served and the pipe- 
line enters the building in the immediate 
vicinity of the source valve. [NFPA 99: 5.1.4.5] 

1320.5.1 The main line valve shall be located to 
permit access by authorized personnel only (i.e.. 



1320.2-1321.2 

by locating above a ceiling or behind a locked 
access door). [NFPA 99: 5.1.4.5.1] 

1320.5.2 The main line valve shall be located on 
the facility side of the source valve and outside of 
the source room, enclosure, or where the main 
line first enters the building. [NFPA 99: 5.1.4.5.2] 

1320.5.3 The main line shall be labeled in 
accordance with Section 1323.0. [NFPA 99: 
5.1.4.5.3 and 5.1.11.2.4] 

1320.6 Riser Valve. Each riser siipplied from the 
main line shall be provided with a shutoff valve 
adjacent to the riser connection. Riser valves shall be 
permitted to be located above ceilings, but shall 
remain accessible and not be obstructed. [NFPA 99: 
5.1.4.6,5.1.4.6.1] 

1320.7 Zone Valve. All station outlets/inlets shall 
be supplied through a zone valve as follows: 

(1) The zone valve shall be placed such that a 
wall intervenes between the valve and 
outlets/inlets that it controls. 

(2) The zone valve shall serve only outlets /inlets 
located on that same story. [NFPA 99: 5.1.4.8] 

1320.7.1 Zone valves shall be readily operable 
from a standing position in the corridor on the 
same floor they serve. [NFPA 99: 5.1.4.8.1] 

1 320.7.2 Zone valves shall be so arranged that 
shutting off the supply of medical gas or 
vacuum to one zone will not affect the supply of 
medical gas or vacuum to another zone or the 
rest of the system. [NFPA 99: 5.1.4.8.2] 

1320.8 Service Valves. Service valves shall be 
placed in the branch piping prior to any zone valve 
box assembly on that branch. [NFPA 99: 5.1.4.7.2] 

1320.8.1 Only one service valve shall be 
required for each branch off of a riser regardless 
of how many zone valve boxes are installed on 
that lateral. [NFPA 99: 5.1.4.7.1] 

1320.8.2 Service valves shall be installed to 
allow servicing or modification of lateral branch 
piping from a main or riser without shutting 
down the entire main, riser, or facility. [NFPA 99: 
5.1.4.7] 

1321.0 Pressure-Regulating Equipment. 

1321.1 Pressure-regulating equipment shall be 
installed in the supply main upstream of the final 
line-pressure valve. Where multiple piping systems 
for the same gas at different operating pressures are 
required, separate pressure-regulating equipment, 
relief valves, and source shutoff valves shall be 
provided for each pressure. 

1321.2 Each central supply system shall have a 
pressure-relief valve set at fifty (50) percent above 



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211 



1321.2-1323.4 



UNIFORM PLUMBING CODE 



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normal line pressure, installed downstream of the 
pressure regulator and upstream of any shutoff 
valve. This pressure-relief valve shall be permitted to 
be set at a higher pressure, provided another 
pressure-relief valve set at 50 percent above normal 
line pressure is installed in the main supply line. 

1321.2.1 All pressure-relief valves shall close 
automatically when excess pressure has been 
released. 

1321.2.2 Pressure-relief valves set at 50 percent 
shall be vented to the outside from all gas 
systems, except medical air, or if the total 
capacity of the supply system is in excess of 
3,000 feet^ (85 m^) of gas. 

1321.2.3 Pressure-relief valves shall be of brass 
or bronze and specially designed for the gas 
service involved. 

1321.2.4 A pressure-relief valve shall not be 
isolated from its intended use by any valve. 

1321.3 Pressure Gauges. 

Pressure and vacuum indicators shall be readable 
from a standing position. Pressure/ vacuum 
indicators shall be provided at the following 
locations, as a minimum: 

(1) Adjacent to the alarm-initiating device for 
source main-line pressure and vacuum alarms 
in the master alarm system. 

(2) At or in area alarm panels to indicate the 
pressure /vacuum at the alarm activating 
device for each system that is monitored by 
the panel. 

(3) On the station outlet/inlet side of zone 
valves. [NFPA 99: 5.1.8.2.1, 5.1.8.2.2] 

1322.0 Station Outlets/Inlets. 

Station outlets and inlets shall be installed in strict 
accordance with the manufacturers' instructions. 

1322.1 After installation of the piping, but before 
installation of the station outlets /inlets and other 
medical gas and medical gas system components 
(e.g., pressure-actuating switches for alarms, 
manifolds, pressure gauges, or pressure relief 
valves), the line shall be blown clear by means of oil- 
free, dry nitrogen. 

1323.0 Labeling and Identification. The gas content 
of medical gas piping systems shall be readily 
identifiable by appropriate labeling with the name 
and pressure contained. Such labeling shall be by 
means of metal tags, stenciling, stamping, or 
adhesive markers, in a manner that is not readily 
removable. Where supplementary color identification 
of piping is used, it shall be in accordance with the 



gases and colors indicated in CGA Pamphlet C-9, 

Standard Color-Marking of Compressed Cylinders 
Intended for Medical Gas Use, See Table 13-1. 

1323.1 Piping shall be labeled by stenciling or 
adhesive markers that identify the medical gas, 
support gas, or vacuum system and include: 

(1) The name of the gas/vacuum system or the 
chemical symbol per NFPA 99: Table 5.1.11. 

(2) The gas or vacuum system color code per 
NFPA 99 Table 5.1.11. 

(3) Where positive-pressure gas piping systems 
operate at pressures other than the standard 
gauge in NFPA 99 Table 5.1.11, the pipe labeling 
shall include the operating pressure in addition 
to the name of the gas. [NFPA 99: 5.1.11.1.1] 

Pipe labels shall be located as follows: 

(1) At intervals of not more than 20 ft (6,100 mm). 

(2) At least once in or above every room. 

(3) On both sides of walls or partitions penetrated 
by the piping. 

(4) At least once in every story height traversed 
by risers. [NFPA 99: 5.1.11.1.2] 

1 323.2 Shutoff valves shall be identified as follows: 

(1) The name or chemical symbol for the 
specific medical gas or vacuum system. 

(2) The room or areas served. 

(3) A caution to not close or open valve except 
in emergency. [NFPA 99: 5.1.11.2.1] 

1 323.3 Station outlets and inlets shall be identified as 
to the name or chemical symbol for the specific 
medical gas or vacuum provided. [NFPA 99 : 
5.1.11.3.1] 

1323.4 The shutoff valves described in Sections 
1320.4, 1320.5, and 1320.6 shall be labeled to reflect 
the rooms that are controlled by such valves. 
Labeling shall be kept current from initial 
construction through acceptance. Valves shall be 
labeled in substance as follows: 

In-line shutoff valves shall be labeled in substance 
as foUows: 

CAUTION 

(NAME OF MEDICAL GAS) VALVE 

DO NOT CLOSE EXCEPT IN EMERGENCY 

THIS VALVE CONTROLS SUPPLY TO... 

Source valves shall be labeled in substance as 
follows: 



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HEALTH CARE FACILITIES AND 
MEDICAL GAS AND VACUUM SYSTEMS 

SOURCE VALVE 

FOR THE (SOURCE NAME). 

Main line valves shall be labeled in substance as 
follows: 

MAIN LINE VALVE FOR THE 

(GASA^ACUUM NAME) SERVING THE 

(NAME OF BUILDING). 

Riser valve(s) shall be labeled in substance as 
follows: 

RISER FOR THE (GAS/VACUUM NAME) 

SERVING (NAME OF THE AREA/BUILDING 

SERVED BY THE PARTICULAR RISER). 

Service valve(s) shall be labeled in substance as 
follows: 

SERVICE VALVE FOR THE 

(GAS/VACUUM NAME) SERVING 

(NAME OF THE AREA/BUILDING 

SERVED BY THE PARTICULAR VALVE). 

[NFPA 99: 5.1.11.2.3-6] 

1324.0 Alarms. All master, area, and local alarm 
systems used for medical gas and vacuum systems 
shall include the following: 

(1) Separate visual indicators for each condition 
monitored, except as permitted for local 
alarms that are displayed on master alarm 
panels. 

(2) Visual indicators that remain in alarm until 
the situation that has caused the alarm is 
resolved. 

(3) A cancelable audible indication of each 
alarm condition that produces a sound 
with a minimum level of 80 dBA at 3 feet 
(920 mm). 

(4) A means to visually identify a lamp or LED 
failure. 

(5) Visual and audible indication that the 
wiring to an alarm initiating device is 
disconnected. 

(6) Labeling of each indicator, indicating the 
condition monitored. 

(7) Labeling of each alarm panel for its area of 
surveillance. 

(8) Re-initiation of the audible signal if another 
alarm condition occurs while the audible 
alarm is silenced. 

(9) Power for master and area alarms from the 
life safety branch of the emergency electrical 
system as described in Chapter 4, Electrical 
Systems. 



1323.4-1325.1 

(10) Power for local alarms, dew point sensors, 
and carbon monoxide sensors permitted to 
be from the same essential electrical branch 
as is used to power the air compressor 
system. 

(11) Wiring from switches or sensors that is 
supervised or protected as required by 
Section 517.30(C)(3) of NFPA 70, National 
Electrical Code, for emergency system circuits. 

(12) Assurance by the responsible authority of 
the facility that the labeling of alarms, where 
room numbers or designations are used, is 
accurate and up-to-date. 

(13) Provisions for automatic restart after a power 
loss of 10 seconds (e.g., during generator 
startup) without giving false signals or 
requiring manual reset. [NFPA 99: 5.1.9.1(1), 
(3), (4), (5), (6), (7)] 

1324.1 Fimctioning of all alarm components shall be 
verified in accordance with testing and monitoring 
requirements of the manufacturer and the Authority 
Having Jurisdiction. 



1325.0 Medical Air System. 

compressors shall be installed 



Medical air 
in a well-lit, 
ventilated, and clean location and shall be accessible. 
The location shall be provided with drainage 
facilities. The medical air compressor area shall be 
located separately from medical gas cylinder system 
sources, and shall be readily accessible for 
maintenance. 

1325.1 Medical air compressors shall be sufficient to 
serve the peak calculated demand with the largest 
single compressor out of service. In no case shall 
there be fewer than 2 (two) compressors. [NFPA 99: 
5.1.3.5.11.2] 

Medical air compressor systems shall consist of the 
following: 

(1) Components complying with NFPA 99: 
5.1.3.5.4 through NFPA 99: 5.1.3.5.10, arranged 
per NFPA 99: 5.1.3.5.11. 

(2) An automatic means to prevent backflow 
from all on-cycle compressors through all 
off -cycle compressors. 

(3) A manual shutoff valve to isolate each 
compressor from the centrally piped system 
and from other compressors for mairitenance 
or repair without loss of pressure in the system. 

(4) Intake filter-mufflers of the dry type. 

(5) Pressure relief valves set at 50 percent above 
line pressure. 

(6) Piping between the compressor and the source 
shutoff valve compatible with oxygen that 



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213 



1325.1 -1326.1 



UNIFORM PLUMBING CODE 



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does not contribute to contaminant levels. 
[NFPA 99: 5.1.3.5.3.2] 

(7) Except as defined in NFPA 99: 5.1.3.5.3.2(1) 
through NFPA 99: 5.1.3.5.3.2(6), materials 
and devices used between the medical air 
intake and the medical air source valve shall 
be permitted to be of any design or construc- 
tion appropriate for the service, as determined 
by the manufacturer. [NFPA 99: 5.1.3.5.3.2] 

1 325.2 The medical air compressors shall draw their 
air from a source of clean air located where no 
contamination is anticipated from engine exhausts, 
fuel storage vents, medical-surgical vacuum system 
discharges, particulate matter, or odor of any type. 
[NFPA 99: 5.1.3.5.13.1] 

1325.3 Compressor intake piping shall be hard- 
drawn seamless copper, and one of the following: 

(1) ASTM B 819, Standard Specification for 
Seamless Copper Tube for medical Gas 
Systems, medical gas tube. 

(2) ASTM B 88, Standard Specification for 
Seamless Copper Water Tube, water tube 
(Type K or L). 

(3) ASTM B 280, Standard Specification for Seam- 
less Copper Tubing for Air Conditioning and 
Refrigeration Field Service, 280ACR tube. 
[NFPA 99: 5.1.3.5.13.4] 

The compressor air intake shall be located 
outdoors above roof level, at a minimum distance of 
10 feet (3,050 mm) from any door, window, exhaust, 
other intake, or opening in the building and a 
minimum distance of 6,100 mm (20 feet) above the 
ground. [NFPA 99: 5.1.3.5.13.2] 

If an air source equal to or better than outside air 
(e.g., air already filtered for use in operating room 
ventilating systems) is availab