46 C.F.R. § 154.1725 Ethylene oxide.
Title 46 - Shipping
(a) A vessel carrying ethylene oxide must: (1) Have cargo piping, vent piping, and refrigeration equipment that have no connections to other systems; (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 (G-MSO); (3) Have valve disk faces, and other wearing parts of valves made of stainless steel containing not less than 11% chromium; (4) Have gaskets constructed of spirally wound stainless steel with teflon or other material specially approved by the Commandant (G-MSO); (5) Not have asbestos, rubber, or cast iron components in the cargo containment system and piping; (6) Not have threaded joints in cargo piping; (7) Have a water spray system under §154.1105 that protects the above deck cargo piping; and (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. (b) Cargo hose used for ethylene oxide must: (1) Be specially approved by the Commandant (G-MSO); and (2) Be marked “For (Alkylene or Ethylene) Oxide Transfer Only.” (c) Ethylene oxide must be maintained at less than 30 °C (86 °F). (d) Cargo tank relief valves for tanks containing ethylene oxide must be set at 539 kPa gauge (78.2 psig) or higher. (e) The vapor space of a cargo tank carrying ethylene oxide must be maintained at a nitrogen concentration of 45% by volume. (f) A vessel must have a method for jettisoning ethylene oxide that meets §§154.356 and 154.1872. [CGD 74–289, 44 FR 26009, May 3, 1979, as amended by CGD 82–063b, 48 FR 4782, Feb. 3, 1983]
Title 46: Shipping
PART 154—SAFETY STANDARDS FOR SELF-PROPELLED VESSELS CARRYING BULK LIQUEFIED GASES
Subpart D—Special Design and Operating Requirements
§ 154.1725 Ethylene oxide.
