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A longitudinal bulk head tank attached to the board.

Related Terms

SLOP TANK

A tank in a tanker into which the residue of tank washing are pumped.

MAXIMUM ALLOWABLE WORKING PRESSURE

Maximum allowable working pressure is the maximum gauge pressure permissible in the top of a cargo tank for a designated temperature. This pressure is based on calculations for each element in a cargo tank using nominal thicknesses, exclusive of allowances for corrosion and thickness required for loadings other than pressure. It is the basis for the pressure setting of the pressure-relieving devices protecting the vessel which is known as the maximum allowable relief valve setting or MARVS. The design pressure may be used in place of the maximum allowable working pressure in cases where calculations are not made to determine the value of the latter.

OVERFLOW

Accidental escape of oil out of a tank when it gets too full because pumping was not stopped in time

BALLAST TANK

Tanks at the bottom or sides of a ship which are filled with seawater for ballasting purpose.

BILGE BRACKET

A vertical transverse flat plate welded to the tank top or margin plate and to the frame in the area of the bilge.

CRITICAL TANK

A tank used in custody transfer service or any tank which could have a significant product loss.

DEEP TANK

Tanks extending from the bottom or inner bottom up to or higher than the lowest deck

CEILING

A covering usually of wood, placed over the tank top for its protection

SWASH PLATE

A plate serving the purpose of a swash bulkhead, but not extending to the bottom of the tank

AERATING

Aerating means the introduction of fresh air into a tank with the object of removing toxic, flammable and inert gases and increasing the oxygen content to 21 per cent by volume.
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