46 CFR §154.1725

1. (a)A vessel carrying ethylene oxide must:
   1. (1)Have cargo piping, vent piping, and refrigeration equipment that have no connections to other systems;
   2. (2)Have valves, flanges, fittings, and accessory equipment made of steel, stainless steel, except types 416 and 442, or other material specially approved by the Commandant (CG-OES);
   3. (3)Have valve disk faces, and other wearing parts of valves made of stainless steel containing not less than 11% chromium;
   4. (4)Have gaskets constructed of spirally wound stainless steel with Teflon or other material specially approved by the Commandant (CG-OES);
   5. (5)Not have asbestos, rubber, or cast iron components in the cargo containment system and piping;
   6. (6)Not have threaded joints in cargo piping;
   7. (7)Have a water spray system under § 154.1105 that protects the above deck cargo piping; and
   8. (8)Have a nitrogen inerting system or on board nitrogen gas storage that can inert the vapor space of an ethylene oxide cargo tank for a period of 30 days under the condition of paragraph (e) of this section.
2. (b)Cargo hose used for ethylene oxide must:
   1. (1)Be specially approved by the Commandant (CG-OES); and
   2. (2)Be marked “For (Alkylene or Ethylene) Oxide Transfer Only.”
3. (c)Ethylene oxide must be maintained at less than 30 °C (86 °F).
4. (d)Cargo tank relief valves for tanks containing ethylene oxide must be set at 539 kPa gauge (78.2 psig) or higher.
5. (e)The vapor space of a cargo tank carrying ethylene oxide must be maintained at a nitrogen concentration of 45% by volume.
6. (f)A vessel must have a method for jettisoning ethylene oxide that meets §§ 154.356 and 154.1872.