CFR › Title 33 › Part 157 › §157.22033 CFR §157.220Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)Cargo tanks that are designated as dedicated clean ballast tanks must allow the tank vessel to meet the draft and trim requirements under §§ 157.10a(d) and 157.10b(b).(b)Each tank under paragraph (a) of this section must be:(1)A wing tank; or(2)Any other tank that is accepted by the Commandant.