DOCKING REPORT MANUAL
Guide To Fouling Organisms and Instructions Regarding The Docking Report
Agu sea Bureau of Ships VM Navy Department
a Washi , D.C. Jas ashington, D.C Ls WSs 1942 1942,
Lo. A
DOCKING REPORT MANUAL
Guide To Fouling Organisms and Instructions Regarding The Docking Report
MMC
MBL/WHO!
MOM
Bureau of Ships Navy Department Washington, D.C.
1942
0 0301 OO?e2lLb 3
PREFACE
The Navy is devoting much time and effort to the improvement of its formulas for ship-— bottom paints. Because many different factors control the amount of fouling and corrosion, new formulas should not be adopted for widespread service use until they are tested under service conditions. Since further improvement is guided by information which can be obtained only at the time of docking, it is essential that the docking reports be as complete and accurate as possible. The data they contain will be summarized for Strata .Stical analysis.
This booklet was prepared to assist docking officers in filling out the present form (N.B.S. 223), especially in regard to estimating the ex-— tent of fouling, and identifying the marine life with which a ship is fouled. It is requested that particular care be taken to insure that the reports are prepared with care and submitted promptly.
A28183
eae:
INTRODUCTION HOW SHIPS BECOME FOULED
The fouling of a ship's bottom begins as soon as the ship is waterborne, regardless of the fact that the bottom as a whole may never become visi- bly fouled. The process of fouling can be divi- ded into three phases, which may take place, how— ever, more or less simultaneously. These are the formation of a slime film, the attachment of ma-— eroscopic, or visible, fouling organisms, and the growth of these larger forms.
The slime begins to form immediately on any surface that is submerged in the sea. It is pro-— duced by microscopic plants and animals which se— crete a slimy substance. Particles of sand, silt, and organic material then become attached to this film which may become fairly thick in a_ short period of time. Films as much as a millimeter and a half (0.06 inch) in thickness have been ob-— served on test panels.
The slime film may influence the attachment of macroscopic fouling forms, the second phase of the fouling process. It has been repeatedly de— monstrated that this film concentrates the metals which are put in the paint as poisons. A very slimy film forms a surface to which the larger fouling forms appear to attach with difficulty. On the other hand, a "silty" film (one which is granular or sandy in consistency) seems to have very little influence on the attachment of foul— ing.
The attachment of the macroscopic or visible fouling forms starts the critical stage of foul-— ing. The effectiveness of an antifouling paint must be measured by its ability to hinder the at-— tachment of these organisms, since, when once attached, they seem to grow regardless of the toxicity of the paint.
All of the important macroscopic forms begin as tiny, microscopic forms, called larvae. For a short time these larvae swim freely in the water. Then, after a period which varies from a few min— utes to several weeks, depending upon the kind of organisms, they must become attached to a surface in order to survive. After their attachment, the larvae change to the adult shape, and grow very rapidly. The poisons in the paint seem to have little or no effect on the adult organisms.
An effective antifouling paint must therefore prevent the attachment of the fouling organisms.
FACTORS AFFECTING FOULING
Numerous factors influence the amount of foul— ing on a ship's bottom. Ships in tropical and sub-tropical waters foul more rapidly than those in northern, colder waters. In southern waters fouling takes place all year round. In northern waters very little fouling occurs during the win-— ter, but in summer the amount may be heavy. The amount of fouling depends to a great extent on
the history of the ship since the last docking. Fouling is always heavier in harbors than in the
open ocean. Furthermore, some of the younger and
some soft—bodied forms may be removed from the moving ship by the friction of the water. Conse— quently, a ship which lies at anchor for long pe— riods is much more likely to foul than an active ship. Since most of the forms which attach in tropical waters cannot live in cold water, a ship which cruises north and south frequently has less fouling than one that stays in the same latitude. Fresh water will kill most of the marine fouling forms. The large shells of the adults will re- main after the animal is dead, however, so that a trip into fresh water is less effective in reduc— ing skin friction than is popularly supposed. Perhaps the most important factor influencing the amount of fouling is the paint applied at the last docking, and the length of time this paint has been exposed to the action of sea water. Paints differ considerably in their effective— ness. Some are very efficient for short periods of time but are rendered ineffective after a few months in the water. No antifouling paint has yet been invented which will be effective indef— initely, but great progress has been made in the last few years, and there is promise of definite
improvement over present performances.
GUIDE TO FOULING ORGANISMS
The visible fouling organisms belong to seven Main groups. In spite of the fact that the dif- ferent kinds in each group may vary widely in ap-— pearance, they all have certain features in com— mon, and as these features are easy to recognize, any given organism can be placed in the proper group.
Three of the groups are characterized by hav— ing hard, often limy shells. These are the An— nelids (worm tubes), Barnacles, and Mollusks. Three other groups (the Alyae, Hydroids, and Tu— nicates) include only soft—bodied forms. The members of the remaining group, the Bryozoa, are mostly soft—bodied, but a few have limy shells which form encrusting patches. Thus to identify any sort of fouling organism, the first step is to learn if it has a shell. Next the table on page 10 should be consulted, and finally the identification obtained from this table should be checked with the description of the group to which the organism seems to belong.
When there is difficulty in classifying a soft—bodied form, placing it in a dish of water will sometimes help to show its characteristic structures.
The terms grass and moss are popularly used for Bryozoa and Hydroids as well as Algae, but they do not have definite meanings when applied to marine organisms. True grasses and mosses do not occur in the sea.
Wooden vessels may support an additional sort of marine organisms——animals that actually burrow into the hull. Shipworms {or teredos), which are the principal type of this class, are true Mol— lusks. At the far end of their shell—lined tun- nels, the typical forms have a clamlike sitell which is far too small to contain the long worm— like body, and is used as a cutting instrument to lengthen the curved and twisted burrow. As the entrance to each tunnel at the surface of the hull is relatively small, the extensive damage caused by shipworms is often overlooked.
A second type of animals that burrow in wooden hulis is represented by the Gribble (Linnoria Lignorum). This is a small crustacean, 1/8 to 1/4 of an inch long, that looks like a tiny sow— bug or woodlouse. It gnaws interlacing burrows in the surface of the wood. As it is often very abundant, the outer layers of an unprotected hull may be speedily destroyed.
KEY TO THE ORGANISMS IMPORTANT
IN THE FOULING OF SHIPS* BOTTOMS
I. Organisms with hard, often limy shells: A. Coiled or twisted tubular shells. .. . Annelids B. Cone-shaped shells attached di- rectly to the hull, or shells with
a) loner ans Cunlara sigalike® ote te cule sels 6 Da eiaches
C. Flat, spreading, granular discs OL Apiditiehes.. 7 4 Merce euler ia =) ene elo. el co ol eV OZo
D. Paired shells, such as clams,
mussels, oysters, etc. . . « « « « « « « Mollusks II. Organisms without shelts: A. Green, brown, or red filaments or leaflike structures, generally near
water line. e e e e e e e e e e e e e e ° e Algae
B. Branching tree-shaped growths, the branches not expanded at the tips. ... . .bryozoa
C.. Straight “of baanching growtis, each thread terminating in an ex-—
Panded-Cipe is hese en wie ole Ye bel) sete Det yVOrOLrds
D. Rounded soft spongy masses. .... .. « Tunicates
10
Fig. 1. <Annetlid.
ANNELIDS (Worm Tubes)
These organisms can be readily recognized by their hard tubular shells (figs. 1 and ee each of which houses a living worm. Sometimes the whole shell adheres firmly to the hull, but it may rise from the surface and stand out at a sharp angle. These tubes range in length from a fraction of an inch to several inches, and may form a large proportion of the fouling, especial-— ly on ships which have been stationed in the Ha-— waiian Islands or the southern Pacific. Some of the commonest forms have the scientific name of Hydroidese This should not be confused with Hy-— droids, the common name of an entirely different group of animals.
11
Figo. 2 ACom Barnacles,.
BARNACLES
In many waters, Barnacles are the predominant form of fouling. Two general types are found. Acorn Barnacles (figs. 2 and 18) have a hard, conical shell which is made up of several dis-— tinct plates, and varies from a fraction of an inch to several inches in diameter at the base. The top of this cone is covered by four movable plates which may become detached when the animal
dies. When the whole cone drops off or is re-
12
Pig. 3. Stalked Barnacles.
moved from the hull, a basal, limy plate is gen-— erally left behind.
The other type of Barnacle is the Stalked or Gooseneck Barnacle (fig. 3). Whereas Acorn Bar-— nacles are attached to the hull by the calcareous plates which form the cone-shaped shell, Stalked Barnacles have a muscular stalk which suspends the body from the hull. The body proper of both types is always protected by limy plates.
13
Fig. 4Y. Mussels (Mollusks).
MOLLUSKS (Shellfish or Bivalves)
This group includes the familiar edible clams, oysters, and mussels (fig. 4). All of the forms important in fouling are characterized by having paired or "two-valved" shells. They are general-— ly attached to the hull at the region of the hinge of this double shell. Very many shapes are found, but all are characterized by this paired hinged shell, a structure not found in any other group of fouling organisms. Mollusks may grow to a large size, and since they may become attached to other Mollusks which in turn are attached to the hull, they frequently build up a large bulky mass of fouling.
14
Fig. 5. Bryozoa (soft-bodied forms).
BRYOZOA (Coral Patches, etc.)
The Bryozoa include some soft—bodied, and some hard—-bodied forms. Bryozoa are colonial animals, the colony being made up of hundreds or thousands of minute individuals. The colony may vary in appearance from a branching structure suspended by a single strand (fig. 5) to a moss-like mat of material or a thin encrusting growth (so-called
coral patch) which spreads over a large area
15
a
LG Oe SEN OZOCs | CONG palclesyis
(fig. 6). When an adult Barnacle falls off the hull it generally leaves behind a circular patch or base plate. This may resemble a coral patch. The base plate of the Barnacle is marked by lines, whereas the coral patch is distinctly granular in appearance. The flat encrusting type of Bryozoa is frequently hard and calcareous, whereas the branching type is generally soft and flexible.
16
boot 6 po as
Fig. 7. Algae, A, D, &, green algae; B, a red alga; C, a brown alga.
ALGAE (Green 'Moss", Brown "Moss"’)
The zone of fouling just below the water line is usually composed of Algae. These are true ma-— rine plants, and aside from microscopic forms and a few flowering plants, the only members of the vegetable kingdom that occur in the sea. Since they cannot grow without light, they are seldom found on the deeper portions of the hull between the bilge keels. The commonest types are green in color, but others are various shades of red, brown, and purple. (In the docking reports,
17
"brown moss" should include all the forms which are not definitely green.)
The characteristic fouling forms consist of mats of long slender threads or filaments, usual— ly branched (fig. 7, A, B, and E). Others have fronds resembling ribbons or leaves of lettuce (fig. 7, D), and still others (known as rock-— weeds) have hollow swellings which serve as floats: (fig gee). .
It is desirable to distinguish between green and brown algae. The latter are considered more objectionable in that they adhere more tightly. Consequently they often tear off the paint in the wind and water area which is then subject to in-
creased fouling and corrosion.
HYDROIDS
Hydroids (figs. 8 and 9) are small animals with slender stalks. Joined together like Sia-— mese twins, they usually live in plantlike col-— onies composed of many individuals. Each branch of a colony represents a single individual. At the end of each branch is a flowerlike expansion, frequently pink in color. These expansions read— ily distinguish Hydroids from the branching types of Bryozoa. When attached to a hull, Hydroids often form a pale cream or tan mat which may be very thick and extensive.
For a discussion of the term Hydroides, see page 11.
18
Pig. 8. Hydroids, attached to a panel, normal size.
59 a x
“80
19
Fig. 10. Tunicates photographed under water.
TUNICATES (Sea Squirts)
Tunicates are soft—bodied, more or less leath— ery animals of various irregular shapes, often with a translucent covering (figs. 10 and 11). Each individual has two openings, one used as the intake and the other as the discharge for the sea water from which they sift their food, but as some kinds are colonial, a single mass may have more than one pair of holes. From their habit of expelling sea water, sometimes from both openings at once, these animals have also received the
name of sea squirts.
20
Pig. 11. Tunicates on an exposed hull.
21
INSTRUCTIONS REGARDING THE DOCKING REPORT
As shown in the introduction, the extent of fouling is dependent on the areas in which a ship has operated, the time of year when it visited these areas, the total period out of dock, and the percentage of days when the ship was moored. Without this information, there is no way to estimate the severity of the conditions to which a Ship has been exposed, which is the basis upon which to measure the effectiveness of the paints.
Some of these data for the docking report must be obtained from the commanding officer of the ship. The first page of the form (N.B.S.223a), which has been printed to simplify the gathering of this information, is reproduced on the oppo— site page. The material on the reverse of this form is quoted below.
Other data required in the docking report will be found in the report of the previous docking. In case the ship was last docked at another yard, the above form will indicate whether a report of
this docking is available in the ship's files. MOORING AREAS
"Absolute precision in this part of the report is unnecessary as the Bureau of Ships simply wishes to learn whether the paint on the ship's bottom has been exposed to virulent conditions of fouling.
"Tye accompanying map indicates ten oceanic
areas, each of which is reported to have distinc—
eae
N.B.S.2238
SUPPLEMENTARY DATA FOR DOCKING REPORT
TO BE SUPPLIED BY VESSEL TO BE DOCKED
This report may be filled out im Tonghand. One copy only is re- quired. If the information demands a. security classification, indi— cate the category in an appropriate space (ref. Navy Regulations 754).
From: Commanding Officer, U.S.S. Ship to be docked
(OS aE —E—EE——e Agency preparing the docking report
|. ls report of last docking available in ship's files? It may be necessary for the docking officer to consult this report if the 6hip was last docked at another yard.
2. Date of last docking. 3. Percentage of inactivity since last docking.
Days not underway
Days waterborne ae %
4. Environment since last undocking. See ov
) 5
MOORING AREAS (in-order of relative duration) LOCALITY MONTHS BY NAME Longest 2nd longest 3rd longest 4th longest 5th longest 5. Propellers were last cleaned on 6. Boottop area was last touched up by ship's force on using formula 7. What are titles of unit and force commanders to whom
a copy of the report of docking should be sent?
A28107
“SuUCtAIpUOS BULInNO, Guale,Jip {0 Speuy “eT “sar
tive features in regard to fouling. These re- gions are numbered in approximately the order of their relative severity.
"Before filling out the table on the reverse side, jot down in chronological order the areas in which the vessel has moored since last undock— ing. Then group together all successive moorings
which were in the same area.
"For example, if a ship which has been operating out of Boston in area 8 makes test runs off Rockland and then returns to Boston, all the time moored in either port is included in the time spent in mooring area 8.
"But if the ship makes a shakedown cruise to Guantanamo, the fouling organ-— isms which may have attached in area & Beene <VOseqd. CO ditterent condat tons, es— pecially of water temperature. This may cause them to die while other organisms may attach. Upon the return to mooring area 8, the tropical fouling is exposed to temperate zone conditions, and may in Gimnind te...) Hence mooring, during the ‘sue- ceeding operating period in area 8 should
Moin a tmewe Liwe ~an. the table.
"The five longest mooring areas should then be rearranged in order of their relative duration for insertion in the table. Be sure to include the names of the months in which these moorings took place."
25
FOULING GRADES
To aid in judging the extent of fouling, pho- tographs showing all but "negligible" fouling are reproduced as figures 13-16. The grades estab— lished by these photographs may seem rather se-— vere, but it should be emphasized that any foul— ing in a given area represents a partial failure of the paint. The percentage of film area that is ineffective is more important than the total weight or thickness of the fouling.
When the fouling is evenly distributed over a hull (not concentrated in definite patches), the grading should take into consideration the fact that such areas may soon become fouled complete— ly, either by the enlargement of the present im— Perfections of the film, or by the attachment of additional fouling upon that already in place. Uniformly distributed fouling indicates that the fault probably lies in the formula of the paint, whereas "patchy" fouling indicates improper mix— ing during manufacture or application. (The grad— ings in the table on page 2 of the docking report contemplate the greater likelihood of "patchy" fouling.) The following scale will help to cor- relate these gradings for both situations.
PERCENTAGE OF GIVEN CORRESPONDING GRADE AREA UNIFORMLY FOULED OF "PATCHY" FOULING
0-5% "negligible"
5-10% "in isolated small spots" 10-20% ae ni ‘in large patches" 20-50% (fig. 18 "covering larger part of area" 50- 100% "covering area completely"
26
UO WWO OD
"(91f1 90g 10944044 Ut PAU014D7S S41ys UO ‘sprjouupy fo S4215N19 240uU) S4Z0dS 11 DUS pazD10S1 ur sur) noW
27
Fig. 14. Fouling (mostly Hydroids) in large patches.
*pasv {0
4404
4agun1 pur
40009 (Spt 1 aUUyP
\
7]
sur nog
iE
ae
Fig. 16. Fouling covering area completely.
30
Fig. 17. Fouling organisms (Annelids and Bar- nacles) uniformly distributed. Corresponding to fouling distributed in large patches
31
Fig. 18. Fouling organisms (Barnacles with Bryozoa and Annelids) uniformly distributed. Corresponding
to fouling covering larger part of area.
32
SAMPLE DOCKING REPORT
The sample docking report on the following pages is reproduced to show the correct method of filling out the current form. The information included is not intended to form a consistent whole, but has been selected to explain the pro- cedure in special cases.
The notes on the left-hand pages correspond to the circled numbers in the report.
33
COO eo CO ©
© ©
® ©
If the report contains information demanding a security classification, it should be so indi- cated in this space. Ref. Navy Regulations 754.
Or ship, or office, where report was prepared.
Title of reporting official.
Official number as given in Ships! Data Book. Do not use accounting numbers. Special cases: USCG; WR401;5 etc.
If ship is unnamed, leave blank.
If preparation of report has been delayed, check this date.
If not supplied by ship on form N.B.S.223a, con- sult copy of last undocking report.
Calculate from dates of present docking and last
-undocking. See Table 1.
From docking plans.
Leave blank for use of Bureau of Ships.
To be supplied by ship on form N.B.S.223a. No decimals.
To be supplied by ship on form N.B.S.2238a. See instructions on pages 22 and 25.
34
N.B.S.223 ; Page 1 of 6
DOCKING REPORT (1) Bethlehem Steel Co. YARD oR staTron_(Shipbuilding Div.)
Quincy, Mass. DATE Januar QO, 1942
From: ~~ Supervisor of Shipbuilding, Cuincy
Roi: CHIEF OF BUREAU OF SHIPS
USS ZEBRA (5)
Ship's Class & No. Ship's Name
United Ship Yard Peano eroviaence, R.I. Drydock wo. Marine Railway #2
Docking Hour & Date 0915 1/25/42 6) hae’ lndeeked lee Ll (haunched ) G ) mer. @) = _days. Docking Position #3 (9) ae ee
Afterside After Keel Block
Undocked Hour & Date 1212 1/28/42 To Extreme After End Pet Ors en ane
Time in Dock hrs. DRAFT READINGS
To displacement marks (Roman numerals where fitted)
installation of
Reason for Docking
new propeiiers Docking 8! / 1/2" g' Qn Forward Aft Date Tabulating Card Prepared Undocking Sino M ae 2 Ai Wel Forward Aft
BOTTOM INSPECTION
ENV | RONMENT FOULING SPECIES. NOTED
Days not underway _ 79
Days waterborne 183 43 * ALGAE Mooring Areas (in order of relative duration) (12) (Brown Moss) ANNELIDS LOCALITY MONTHS BY NAME (Worm Tubes) Longest 8 Aus... Ssept.,0Ct. BRYOZOA 2nd longest Nove BEC. (Coral Patches) 3rd longest_ June. Jul MOLLUSKS 2. iiginnes Sell eee a 5 ae (Shellfish, etc.) TUNICATES 5th longest Spee eyo > VOCE. (Sea Squirts)
OTHER TYPES
Number pages consecutively. Add extra sheets as necessary
Enter only antifouling formula number in this Space. Do not omit. Lh no anti fowl ang pia anit was applied at the last docking, give the formula number last used (if known) and note that it was applied at an earlier docking.
See detailed instructions on page 26. Note par- ticularly that only in column "P" (propeller) blades) is the insertion of an "X" permissible. Elsewhere in the table the numerals 1, 2, or 3 must be used. The figure 3 may be employed when the fouling is too heavy to determine the pre- sence or absence of the antifouling film.
To be supplied by ship on form N.B.S.223a.
Submit photographs of special or unusual condi- tions if possible. See figs. 19-20.
36
N.B.S.223 Page 2 of 6
eee hockii By eel SSW Peete eR INE
(3) FOULING RESISTANCE
Formula _L5RC __—Applied at Preceding Docking
A B F P AFT OF MIDSHIPS BOTTOM FWD. OF MIDSHIPS PROPELLER BOOTTOP TO BILGE BETWEEN BOOTTOP TO BILGE SLATES
BILGES FOULING IS NEGLIGIBLE
FOULING IS IN ISOLATED SMALL SPOTS
FOULING IS IN LARGE _ PATCHES
FOULING COVERS LARGER PART OF AREA
FOULING COVERS AREA COMPLETELY
Explain nature of fouling in box avuve by using appropriate comment numbers. "x" in column "P" 1. Fouling is noted only where antifouling film is gone.
2. Fouling is noted on antifouling film which is ineffective.
3. Fouling is so heavy that performance of paint is unsatisfactory.
(15) Propellers ast scleanearon ova ey 2 Y
CONDITION OF ANTIFOULING PAINT FILM
pee Sig, of total area of AF paint is missing due to: ("X" as appropriate to left of item.) X a. Failure to adhere to undercoat. K bd. Failure of undercoats to adhere to hull. c. Film too soft and washes off.
X d. Film too brittle and flakes off.
Remaining film shows:
e. Cracking or alligatoring.
f. Sagging.
© @ ©
Enter only anticorrosive formula numbers in this space. Do not omit.
From report of previous docking.
To be supplied by ship on form N.B.S.2234.
38
N.B.S- 223 Page 3 of 6
PEPER Sooxtna ‘pare. b/ 29/42
CONDITION OF ANTICORROSIVE UNDERCOATS
Formulas applied at preceding docking ist eo ea end coat ouchu 3rd coat
("x" as appropriate to left of item)
g. Anticorrosive performance excellent. x h. Rust streaks show through antifouling film. XK i. Wo black oxide, or very slight black oxide, beneath paint. j- Considerable black oxide beneath paint and breaking through the film in scattered spots. Anticorrosive films adhere poorly. 1. Rusty areas where antifouling film is missing. m. Anticorrosive performance altogether unsatisfactory.
CONDITION OF BOOTTOPPING
Boottop Primer rormars_84_4g_aprites at Preceding Docking. Baottop Paint Formula —- 2 it at Boottop Area hast Touched up by Ship with Formula —— =
BeEEOp area is fouled for a vertical height of: ___ inches throughout length.
ERO! -srtnes at forward end. eS inches at after end.
Os -g of boottopping is missing due to ("x" as appropriate to left of item)
X n. Failure to adhere to undercoat.
Oo. Failure of undercoat to adhere to hull. X p. Film too soft and washes off.
q. Film too brittle and flakes off. X r. Abrasion.
Remarks on Pitting, Rivet Head Corrosion, Galvanizing Remaining, Non-Standard Paints:
Preceding Docking. ae eo /um (19)
Some rust and black oxide on bow where chains and paravane have chafed films off, and scattered spots on rest of bottom. 30% of rivet heads corroded. 80% of galvanizing remaining, (estimated from area uncovered by chipping). Performance of boottopping unsatisfactory. Considerable old pitting under paint, especially
at waterline.
See separate letter report on condition of experimental A.F. paints applied on rudder at last docking.
N.B.S.223 Page 4 of 6
Meee. poet DATE iL
(ae) ae)
PREPARATION OF BOTTOM FOR PAINTIKG
(4) (5) (6) FLAME CHIPPED POWER SCRAPERS DESCALED | PNEU. HAMMER BRUSHED
Underwater 5 75 100
Indicate of Area
oottop 25 20 100
Indicate Location of Area: (3)- Scattered areas where pitting was worst.(4) -to dry out surface after (3) & (5) - underwater: scattered spots between frames 20 & 60 port; boottop: stbd. eft of midship. (5) all surface except where old paint film was tnin and in good condition or where flar2 descaled.
BOTTOM PAINTS APPLIED AT THIS DOCKING
BOOTTOPPING BOOTTOPPING ANTICORROSIVE ANTIFOULING PRIMER PAINT FORMULA 84h 42 142B 25 C
» 100 Lbs. QUANTITY 10 gal. yigels Pate: 9 Gals.
ATMOSPHERIC CONDITIONS Cl Cloud Cloudy (Glear,Cloudy,Showers,Rain,Snowl~~C2P VOU. Showers Clear,Cloudy
TEMPERATURES Max. 53/590 (Dry Bulb) Pen 49/54 53/59 DATE OF APPLICATION 1/27/42 1/28/42 eye Lae ue
*except part of port side forward of micship-brush epplication.
A pray Spray* Brush
BOOTTOP LIMITS: Upper Edge preteen 1 OMG ie gee le ye: 16" W.L. Forward Aft Lower Edge baa Re atoh Tae Done et Re ile 5) a ee uO hs epee ad feat st Forward aft REMARKS: Wote special conditions, experimental applications, etc.
Cold plastic 165-0=-6;' 16 ‘gal.
Port side -frames 17-22, applied by spray. Stbd.side -frames 52-62, applied by brush. Undercoat 42A.
See Table 2.
Measure at top of shaft only unless shaft is not resting on bottom of bearing, in which case re- port sum of top and bottom clearances. Never measure side clearances. When bearings are re- wooded, indicate clearances as follows:
As found 217 As released -050
If the ship is equipped with rubber bearings, note the fact. Mention if state of wear or dam- age indicates that renewal of these bearings should be made at the next docking. If the upper strips are, or have been, interchanged with the lower, the fact should be noted.
42
N.B.S.223 Page 5 of 6
52'S pe ee pockune DATE 1/25/42 SHAFT CLEARANCES @0 Shaft Devers ea = 2 estan Gee ag CO, Allowed Gia vance ese ee
Shaft Clearances when Docked @!)
Sy. ERMED I ae STRUT AIN STRUT #1 — Stbd. Outbd fs = stad. outed, 119 — Stbd. Inod. 105 #3 — Port Inbdd. #4 — Port Outbd.
Remarks and Work Done (If rewooded, indicate clearance when undockedJRemoved packing from
stuffing boxes and took clearances. Removed #3 inboard stern tube
bearing, rewooded same, and reinstalled with clearence of .100" Rewooc-
ing was done to correct alignment of stern tube shaft. Stuffing boxes
were repacked with 6 turns of 1-1/8" felt vacking. Packing surfaces
are slightly grooved and #4 is worn approx. 1/32". Renewed #1 and
#4 sealing rings. Other sealing rings and protector rings in good
eondition. Zincs are in good condition. Shafting, general condition
and work done - Rough, pitted surface in way of #3 inboard stern tube See Page 6.
PROPELLERS
General Condition, Identification Data, Work Done, Disposition of Removed Propeller: Removed 1 and 2 propellers. Sent #1 to shop with old cone. Installed new #1, serial #25023, and cone. Nos. 2,3 and 4: straightened where bent, welded nicks, polished all over. Balanced #2 and reinstelled. Sounded 211 nuts, and refilled cones with tallow. Propeller data-see page 6.
ye" on ship
Size of Propeller Nut Wrench Location of Wrench
(Form N.B.S. 426 is to be submitted only when propellers are shifted)
STRUTS Condition and Work Done: Considerable pitting of all struts.Welded doublers on the following main struts: Port & Stbd. vertical, outboard & Inboard Port & Stbd. horizontal, top side. Port intermediate vertical - straightened and set to parallel line.
FAIRWATERS AND ROPE GUARDS
Condition and Work Done: (Coupling) Port -Removed 4 sets replaced 2 sets, and renewed 2 sets.
Fairwaters Gtbd. -Removed 4 sets, replaced 3 sets, and renewed 1 set.
Rope guards: port and stba. - renewed 2 sets each.
uSS ZEBRA Docking Date 1/25/42
MARKINGS #1 PROPELLER
Bueng Ser. 9999
Bueng Pian 99-Z-0000
Suitable for ZZ950-999 incl.
Stbd. outboard
Drums mo at
Perec de 1989"
Mfg. Mere Island. N.Y. 1938) (Meet OZ Co: J.9. 999-Z-9999 Item 1 ) or (Contract 9999 HS 6) LE Ses ) (Wt. 12,545# Propeller Key Secured by Press Fit only
ero Pd thoanno Ne ee ees 2 eereeer
Fc eel a et ee
HULL REPAIRS, WELDING, CAULKING OF RIVETS, SEAMS, ETC, Renewed shell plating stbd. side (F-strake, frame 72 to 77) (E-strake 68-1/2 to 81-3/4) (D-strake, frame 68-1/2 to 81-3/4) (C_strake 68-1/2 to 81-1/2) (B-etrake dblr. - frame 69 to S1-1/2) (ASctrake dblr. 70 to 81) Welded dblr. portside. Frame 74 to 76 -A&B strakes. Welded T bar stiffeners on shell uncer longi- Aue) 2 P2221 /2- 8,4, portside trame 74 to 76. Welded (1. stiffeners continuous starboard side under longitudinals telah 2. 9-2-1/2, 3, 4, frame 70 to 80. Welded T bars intercostal between iiemienenere under frame 71-1/2, 75, 74, 75, 77 and 79 centerline to longitudinal 4, Blanked port and stbd. condenser injector and discharge forward engine room. Renewed longitudinals 4-5-6-7-8- S stbd. side from 68 to 82. Renewed frames 69-1/2, 75, 74, 75, 77, 79, 80-1/2 and made bulkheads 71-1/2, 68 and 82 tight by patching, welding and caulking. Caulked 200 rivets on shell. Cut off section of bilge keel from bulkheads 68 to 82 starboard.
SHAFT CLEARANCES - Continued from Page 5.
bearing smoothed by grinding, and polished. Shaft shows normal wear in way of other bearings, anda moderate corrosion throughout exposed length. No other work done except chipping and coating with same paints as used on hull. If corrosion continues, sprayed metal coating is recommended.
@2) Note that per cent of total zines is required.
46
N.B.S.223 Page 6 of 6
Usses. ZEBRA DOCKING DATE 1/25/42
t t
SEA VALVES, SCOOPS
Remarks and Work Done: Removed all strainers, replacing after work completed. Pitted areas of main injections: Welded 50 sq.in vort; 60 sq.in. stbd. _ Removed obsolete valve port, fr.74, E strake and blanked off hole with flush patch. Installed new valve stbd.fr. 50, D strake. Cverhauled and | tested all other valves. Painted all sea chests.
ZINCS AND PROTECTOR RINGS Per Cent of Total Number of Zincs Renewed: 75% @2)
Condition and Work Done: Jnstalled three additional zincs on each side of rudder
Zines not replaced are in fair-to-good condition. Protector rings are in good condition.
| As found: Upper Lower- RUDDER As released: Upper- Lower- | Rudder Post Diameters: ges 20"
Bearing Clearances: OS .064 een Bs
: Pitted Areas, Work Done: Removed rudder, refinished stock and pintle, renewed
| bushings and repacked stuffing box with 3-1/2 turns of 1-1/4" square flax packing. Welding, etc: Port:- Rewelded 22 plug welds, 5 ft. of seam, and welded on and pumped 40" x 78" doubler. Stbd: Rewelded 31 plug welds, 4 ft.
of seam, and welded on and pumped 40" x 78" doubler. Tested rudder, found
free from leat, pales WECDING™ CAULKING OF RIVETS, SEAMS, ETC.
See page 6.
OTHER UNDERWATER WORK ON SOUND GEAR, ETC.
Installed echo sound apparatus bet.frames 24 and 26, port, as per plan #999-999. Mfga. two covers (24-1/2" x 1" and 24-1/2" x 1/4") fitted and delivered to ship. Stbd. projector: removed pitted shaft, metal sprayed with monel, refinished and reinstalled-- J.0. 999-9-Z-9999/9999.
Copies to: John Doe | BuShips
Comd'g. Officers USS ZEBRA . Nich la
Comzedron 99 — ace. i. Mo Chick Osh OG malt Co> nee Comzeddiv 0
| By direction
TABLE |. TABLE OF DAYS BETWEEN TWO DATES
I, 2. 3. 4. 5. 6. 7. 8. Sh 0.
NUMBER OF DAYS AFTER FEBRUARY 28. S-P355
48
TABLE 2.
LIGNUM VITAE AND RUBBER LINED BEARING CLEARANCES
A B ¢ D=Cc/2 DIAMETER | MINIMUM TOTAL TOTAL CLEARANCE AT | ECCENTRICITY OF BORE OF CLEARANCE OF WHICH BEARING ABOVE TRUE CENTER SHAFT NEWLY BORED SHOULD BE RENEWED AT AFTERMOST BEARING SLEEVE BEARINGS (INCHES) (INCHES) (INCHES) (INCHES) | -035 13 Ou] 2 -046 a4 -050 3 -054 u - 060 5 - 066 6 071 7 -077 8 082 -088 0 - 09 | 098 12 103 13 108 4 nis 15 118 : eal 127 g 131 19 135 20 138 21 141 22 143 23 ~145 4 25 149 26 150 152 28 153
SAGGING
ISIS Tee ire NG
Fig. 19. Types of paint failure.
50
CHECKING (surface eracking)
CRACKING and PEELING
ALLIGATORING
Fig. 20. Types of paint failure,
o1