33 C.F.R. § 154.2202 – Vapor line connections.

(a) 33 CFR 154.2101(a), (e), and (g) apply to a tank barge cleaning facility's (TBCF's) vapor control system (VCS).
(b) The remotely operated cargo vapor shutoff valve required by 33 CFR 154.2101(a) must be located upstream of the liquid knockout vessel required by 33 CFR 154.2201(e).
(c) A fluid displacement system must have a remotely operated shutoff valve installed in the fluid injection supply line between the point where the inert gas or other medium is generated and the fluid injection connection. The valve must comply with 33 CFR 154.2101(a)(1) through (6).
(d) Each hose used for transferring vapors must—
1. (1) Have a design burst pressure of at least 25 pounds per square inch gauge (psig);
2. (2) Have a maximum allowable working pressure (MAWP) no less than 5 psig;
3. (3) Be capable of withstanding at least the maximum vacuum rating of the vapor-moving device without collapsing or constricting;
4. (4) Be electrically continuous, with a maximum resistance of 10,000 ohms;
5. (5) Have flanges with a bolthole arrangement complying with the requirements for Class 150 ANSI B16.5 flanges (incorporated by reference, see 33 CFR 154.106);
6. (6) Be abrasion and kinking resistant; and
7. (7) Be compatible with vapors being transferred.
(e) Fixed vapor collection arms must meet the requirements of paragraph (d) of this section.