153.256—Trunks, domes, and openings of cargo tanks.
(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.