StacksVerified U.S. regulatory reference

46 CFR §150.130

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Except as described in § 150.160, the person in charge of a vessel shall ensure that the containment system for a cargo that is a hazardous material meets the following requirements:
  1. (a)The containment system must separate the hazardous material or its residue from any cargo in table 1 with which it is incompatible by two barriers such as formed by a:
    1. (1)Cofferdam;
    2. (2)Empty tank;
    3. (3)Void space;
    4. (4)Cargo handling space;
    5. (5)Tank containing a compatible cargo; or
    6. (6)Piping tunnel.
  2. (b)In this subpart, isolation across a cruciform joint is equivalent to isolation by two barriers.
  3. (c)The containment system for the hazardous material must not have a piping or venting system that connects to a containment system carrying a cargo with which the hazardous material is incompatible. Any such piping or venting system must have been separated from the containment system carrying the incompatible cargo by:
    1. (1)Removing a valve or spool piece and blanking off the exposed pipe ends, or
    2. (2)Installing two spectacle flanges in series with a means of detecting leakage into the pipe between the spectacle flanges.