1625-0101 Stat/Authority

§ 32.59–1

46 CFR Ch. I (10–1–10 Edition)

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risk of fire. This is not intended to preclude the use of other material for nosing, walking surfaces, etc., over the
steel.
(6) Except for washrooms and toilet
spaces, deck coverings within accommodation spaces shall be of an approved type. However, overlays for leveling or finishing purposes which do
not meet the requirements for an approved deck covering may be used in
thicknesses not exceeding 3⁄8 of an inch.
(7) Except as provided in paragraph
(d)(7–a) of this section, ceilings, linings, and insulation, including pipe and
duct laggings, must be made of approved incombustible material.
(7–a) Combustible insulations and
vapor barriers that have a maximum
extent of burning of 122 millimeters (5
inches) or less when tested in accordance with ASTM D 4986, ‘‘Standard
Test Method for Horizontal Burning
Characteristics of Cellular Polymeric
Materials’’ (incorporated by reference,
see § 32.01–1), may be used within refrigerated compartments.
(8) Any sheathing, furring or holding
pieces incidental to the securing of any
bulkhead, ceiling, lining, or insulation
shall be of approved incombustible materials.
(9) Bulkheads, linings and ceilings
may have a combustible veneer within
a room not to exceed 2 millimeters (.079
inch) in thickness. However, combustible veneers, trim, decorations, etc.,
shall not be used in corridors or hidden
spaces. This is not intended to preclude
the use of an approved interior finish
or a reasonable number of coats of
paint.
(e) Wood hatch covers may be used
between cargo spaces or between stores
spaces. Hatch covers in other locations
shall be of steel or equivalent metal
construction. Tonnage openings shall
be closed by means of steel plates or
equivalent metal construction.
(f) Nitrocellulose or other highly
flammable or noxious fume-producing
paints or lacquers shall not be used.
[CGFR 65–50, 30 FR 16671, Dec. 30, 1965, as
amended by CGFR 66–33, 31 FR 15268, Dec. 6,
1966; CGFR 67–90, 33 FR 1015, Jan. 26, 1968;
CGD 74–127, 41 FR 3845, Jan. 26, 1976; CGD 95–
028, 62 FR 51198, Sept. 30, 1997; USCG-1998–
4442, 63 FR 52190, Sept. 30, 1998; USCG-1999–
5151, 64 FR 67177, Dec. 1, 1999]

Subpart 32.59—Minimum Longitudinal Strength and Plating
Thickness Requirements for
Unclassed Tank Vessels That
Carry Certain Oil Cargoes—
TB/ALL
§ 32.59–1 Minimum section
and plating thickness
ments—TB/ALL.

(a) As used in this section, Rule
means the current Rules of the American Bureau of Shipping or other recognized classification society, as appropriate for the vessel’s present service
and regardless of the year the vessel
was constructed.
(b) The requirements of this section
apply to all in-service, unclassed tank
vessels certificated to carry a pollution
category I oil cargo listed in 46 CFR
Table 30.25–1.
(c) For all vessels except those limited on their Certificate of Inspection
to river routes only, the minimum midship section modulus must be—
(1) At least 90 percent of that required by Rule; or
(2) Where there is no specific Rule requirement, at least 100 percent of that
which is necessary to meet the bending
moment developed under a full load
condition in still water, using a permissible bending stress of 12.74 kN/cm2
(1.30 t/cm2, 8.25 Ltf/in2).
(d) Within the 40-percent midship
length, the average flange and web
thicknesses of each longitudinal stiffener must be as follows:
(1) For deck and bottom stiffeners: at
least 85 percent of Rule thickness, unless a buckling analysis demonstrates
that lesser thicknesses can be safely
tolerated. However, the average thickness must never be less than 80 percent
of Rule thickness; and
(2) For side stiffeners: at least 75 percent of Rule thickness.
(e) Within the 40-percent midship
length, the average thickness for longitudinal strength plating must be at
least as follows:
(1) Weather deck: 75 percent of Rule
thickness;
(2) Hatch: 70 percent of Rule thickness;
(3) Trunk: 75 percent of Rule thickness;

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Coast Guard, DHS

§ 32.60–10

(4) Sheer strake: 75 percent of Rule
thickness;
(5) Outer sideshell: 75 percent of Rule
thickness;
(6) Inner sideshell: 75 percent of Rule
thickness;
(7) Outer bottom; 75 percent of Rule
thickness;
(8) Inner bottom: 70 percent of Rule
thickness;
(9) Keel: 75 percent of Rule thickness;
(10) Bulkheads: 75 percent of Rule
thickness.
[CGD 91–209, 58 FR 52602, Oct. 8, 1993]

Subpart 32.60—Hull Requirements
for Tank Vessels Constructed
On or After July 1, 1951
NOTE: Requirements for double hull construction for vessels carrying oil, as defined
in 33 CFR 157.03, in bulk as cargo are found
in 33 CFR 157.10d.

§ 32.60–1 Scantlings,
material,
and
workmanship—TB/ALL.
(a) All tank vessels, the construction
or conversion of which is started on or
after July 1, 1951, shall conform to the
requirements in this subpart in construction of hulls. The hull and deckhouses shall be of steel or iron construction except that the pilothouse
and decks over quarters may be constructed of wood. Scantlings, material,
and workmanship, subdivision of cargo
spaces, fitting of cofferdams, and testing of tanks shall be at least equivalent to the requirements of the American Bureau of Shipping or other recognized classification society.
(b) See subpart 32.57 for structural
fire protection requirements for tank
vessels contracted for on or after January 1, 1963.

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§ 32.60–5 Subdivision of cargo space—
TB/ALL.
The cargo space shall be divided into
tight compartments as necessary to
avoid excessive stresses and to provide
stability.
§ 32.60–10 Segregation of cargo; Grade
A, B, C, or D—TB/ALL.
(a) General. The galleys, living quarters, navigation spaces, general cargo
spaces, boiler rooms, and enclosed
spaces where sources of vapor ignition

are normally present, shall be segregated
from
cargo
tanks
by
cofferdams or pump rooms or tanks, either empty or used to carry liquid having a flashpoint of 150 °F. or above, or
deck spaces enclosed or open.
(b) Cargo tank spaces. Cargo tank
spaces shall extend to the main deck,
with hatches and vents located on the
weather deck. Liquids having a flash
point of not less than 150 °F. may be
carried in the bulk tanks located beyond the segregating cofferdams and/or
pump rooms.
(c) Enclosed spaces. (1) Cargo and vent
piping passing through enclosed spaces
immediately above the bulk cargo
tanks shall be continuous except that
flanged joints connecting pipe sections
will be permitted.
(2) No openings to cargo tank shall be
permitted other than stuffing boxes
through which valve control rods or
permanently installed gage tapes extend and openings for use of tank
cleaning machines. Openings for tank
cleaning machines, when not in use,
shall be kept closed by means of gastight bolted plates and when in use
shall be made essentially gas and watertight by covers through which hose
or pipe to the tank cleaning machines
extend.
(3) The overhead in way of quarters
shall be gastight.
(d) Stowage spaces. The spaces described in paragraph (c) of this section
may be used for stowage purposes and
for general cargo provided that adequate ventilation is furnished.
(e) Openings. (1) Except as provided in
paragraph (c) of this section, there
shall be no manholes or other openings
from cargo tanks to any other enclosed
spaces. An exception may be made to
allow direct access from cargo tanks to
innerbottoms through gas tight bolted
manholes, provided:
(i) The innerbottom tanks are voids
or ballast tanks only, and
(ii) The innerbottom tanks are protected from sources of ignition similar
to the cargo tanks, and any bilge or
ballast pumping system serving the
innerbottom tanks are treated like
cargo pumping systems.
(2) Any vents, sounding tubes, and
similar piping passing through such
tanks shall be run in a suitable trunk;

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