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