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.

[CGD 75-59, 45 FR 70263, Oct. 23, 1980, as amended at USCG-2013-0423, 85 FR 21674, Apr. 17, 2020]