46 C.F.R. § 153.256 Trunks, domes, and openings of cargo tanks.
Title 46 - Shipping
(a) The hatch of a cargo tank must: (1) Be at the highest point of the tank; and (2) Open on or above the weatherdeck. (b) To be endorsed to carry a cargo requiring an independent cargo tank, a tank must have: (1) A trunk or dome at the uppermost part of the tank, extending above the weatherdeck; (2) Its hatch at the top of the trunk or dome; and (3) No openings below the weatherdeck.
Title 46: Shipping
PART 153—SHIPS CARRYING BULK LIQUID, LIQUEFIED GAS, OR COMPRESSED GAS HAZARDOUS MATERIALS
Subpart B—Design and Equipment
Cargo Tanks
§ 153.256 Trunks, domes, and openings of cargo tanks.
