§154.1725. Ethylene oxide.
46 C.F.R. § 154.1725
A vessel carrying ethylene oxide must—
Have cargo piping, vent piping, and refrigeration equipment that have no connections to other systems;
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);
Have valve disk faces, and other wearing parts of valves made of stainless steel containing not less than 11% chromium;
Have gaskets constructed of spirally wound stainless steel with Teflon or other material specially approved by the Commandant (CG-OES);
Not have asbestos, rubber, or cast iron components in the cargo containment system and piping;
Not have threaded joints in cargo piping;
Have a water spray system under § 154.1105 that protects the above deck cargo piping; and
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.
Cargo hose used for ethylene oxide must—
Be specially approved by the Commandant (CG-OES); and
Be marked “For (Alkylene or Ethylene) Oxide Transfer Only.”
Ethylene oxide must be maintained at less than 30 °C (86 °F).
Cargo tank relief valves for tanks containing ethylene oxide must be set at 539 kPa gauge (78.2 psig) or higher.
The vapor space of a cargo tank carrying ethylene oxide must be maintained at a nitrogen concentration of 45% by volume.
Notes, amendments, and revision history
Amendments
[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983; USCG-2014-0688, 79 FR 58285, Sept. 29, 2014]
Authority
Authority: 46 U.S.C. 3703, 9101; Department of Homeland Security Delegation No. 0170.1.
Source
Source: CGD 74-289, 44 FR 26009, May 3, 1979, unless otherwise noted.
Amendments
[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by CGD 82-063b, 48 FR 4782, Feb. 3, 1983; USCG-2014-0688, 79 FR 58285, Sept. 29, 2014]