CFR › Title 46 › Part 153 › §153.46546 CFR §153.465Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy link(a)A tankship that carries a flammable cargo must have two vapor detectors that meet § 35.30-15(b) of this chapter.(b)At least one of the vapor detectors in paragraph (a) of this section must be portable.