StacksVerified U.S. regulatory reference

46 CFR §153.254

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)A cargo tank must have at least one covered manhole opening into the vapor space described in § 153.354.
  2. (b)An access through a vertical cargo tank surface must be at least 60 cm by 80 cm (approx. 23.6 × 31.5 in.) and no more than 60 cm above a foothold grating, or surface on both sides of the access way.
  3. (c)An access through a horizontal cargo tank surface must be at least 60 cm by 60 cm (approx. 23.6 × 23.6 in.).
  4. (d)An access trunk must be no less than 76 cm (approx. 29.9 in.) in diameter.