46 C.F.R. § 154.459

Current through October 31, 2024
Section 154.459 - General
(a) Each cargo tank must have a secondary barrier that meets Table 3 and except as allowed in Table 3, the hull must not be the secondary barrier.
(b) If the Commandant (CG-ENG) specially approves an integral tank for a design temperature at atmospheric pressure lower than -10 °C (14 °F), the integral tank must have a complete secondary barrier that meets § 154.460 .
(c) If the Commandant (CG-ENG) specially approves a semi-membrane tank under the requirements of an independent tank type B, the semi-membrane tank may have a partial secondary barrier specially approved by the Commandant (CG-ENG).
(d) If Table 3 allows the hull to be a secondary barrier, the vessel's hull must:
(1) Meet §§ 154.605 through 154.630 ; and
(2) Be designed for the stresses resulting from the design temperature.

Table 3-Secondary Barriers for Tanks

Tank typeCargo temperature (T) at atmospheric pressure
T[GREATER THAN EQUAL TO]-10 °C (14 °F) T[LESS THAN]-10 °C (14 °F)[GREATER THAN EQUAL TO]55 °C (-67 °F) T[LESS THAN]-55 °C (-67 °F)
IntegralNo secondary barrier requiredTank type not usually allowed1Tank type not allowed.
Membrane......doComplete secondary barrier1Complete secondary barrier.
Semi-membrane......do......doDo.
Independent:
Type A......do......doDo.
Type B......doPartial secondary barrier1Partial secondary barrier.
Type C......doNo secondary barrier requiredNo secondary barrier required.

1 The hull may be a secondary barrier.

46 C.F.R. §154.459

14 U.S.C. 632 ; 46 U.S.C. 369, 375, and 416; 49 U.S.C. 1655(b); 49 CFR 1.46(b)

14 U.S.C. 632 ; 46 U.S.C. 369, 375, and 416 ; 49 U.S.C. 1655(b) ; 49 CFR 1.46(b)