Independent Tank
An Independent tank means a cargo-containment envelope, which is not contiguous with, or part of, the hull structure.
An independent tank is built and installed so as to eliminate whenever possible it's stressing as a result of stressing or motion of the adjacent hull structure.
An independent tank is not essential to the structural completeness of the ship’s hull.
Integral Tank
Integral tank means a cargo-containment envelope which forms part of the ship’s hull and
which may be stressed in the same manner and by the same loads which stress the contiguous hull structure and
which is normally essential to the structural completeness of the ship’s hull.
Gravity Tank
Gravity tank means a tank having a design pressure not greater than 0.07 MPa (Megapascal) or 0.7 bar gauge at the top of the tank.
A gravity tank may be independent or integral.
A gravity tank shall be constructed and tested according to recognized standards.
Pressure tank
Pressure tank means a tank having a design pressure greater than 0.07 MPa (Megapascal) or 0.7 bar gauge.
A pressure tank shall be an independent tank and shall be of a configuration permitting the application of pressure-vessel design criteria according to recognized standards.