(a) The transverse contiguous hull structure of a vessel having cargo containment systems without secondary barriers must meet the standards of the American Bureau of Shipping published in ``Rules for Building and Classing Steel Vessels'', 1981.
(b) The transverse contiguous hull structure of a vessel having cargo containment systems with secondary barriers must be designed for a temperature that is:
(1) Colder than the calculated temperature of this hull structure when:
(i) The temperature of the secondary barrier is the design temperature, and
(ii) The ambient cold condition under Sec. 154.176(b)(1)(ii) and (iii) are assumed; or
(2) Maintained by the heating system under Sec. 154.178. [CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 77-069, 52 FR 31630, Aug. 21, 1987]