---
kind: "section"
citation: "46 C.F.R. § 154.1725"
title: "46"
number: "154.1725"
heading: "Ethylene oxide."
url: "https://uscodex.org/cfr/46/154.1725"
---

# §154.1725. Ethylene oxide.

- (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 (CG-OES);
  - (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 (CG-OES);
  - (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](/cfr/46/154.1105.md) 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)](#e) of this section.
- (b) **Cargo hose used for ethylene oxide must—**
  - (1) Be specially approved by the Commandant (CG-OES); 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](/cfr/46/154.356.md) and [154.1872](/cfr/46/154.1872.md).

## Notes

### 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]