CFR › Title 46 › Part 154 › §154.43546 CFR §154.435Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)The design of a semi-membrane tank, the supporting insulation for the tank, and the supporting hull structure for the tank must be specially approved by the Commandant (CG-ENG).(b)A semi-membrane tank must be designed to meet:(1)§ 154.425 through § 154.432;(2)§ 154.437 through § 154.440; or(3)§ 154.444 through § 154.449.