StacksVerified U.S. regulatory reference

46 CFR §153.404

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
When Table 1 requires a cargo's containment system to have a closed gauge, the containment system must have the following:
  1. (a)A permanently installed closed gauging system.
  2. (b)A vapor return connection.
  3. (c)The high level alarm described in § 153.409.
  4. (d)Either a closed cargo sampling system or a cargo sampling arrangement allowing the retrieval of a sample through an orifice not exceeding:
    1. (1)0.635 cm (approx. 0.25 in.) diameter when the cargo's vapor pressure is 28 kPa gauge (approx. 4 psig) or less; or
    2. (2)0.140 cm (approx. 0.055 in.) diameter when the cargo's vapor pressure exceeds 28 kPa (approx. 4 psig).