46 C.F.R. § 154.439
Tank design
An independent tank type A must meet the deep tank standard of the American Bureau of Shipping published in “Rules for Building and Classing Steel Vessels”, 1981, and must:
(a) Withstand the internal pressure determined under § 154.407;
(b) Withstand loads from tank supports calculated under §§ 154.470 and 154.471; and
(c) Have a corrosion allowance that meets § 154.412.