---
kind: "section"
citation: "46 C.F.R. § 154.522"
title: "46"
number: "154.522"
heading: "Materials for piping."
url: "https://uscodex.org/cfr/46/154.522"
---

# §154.522. Materials for piping.

- (a) The materials for piping systems must meet [§ 154.625](/cfr/46/154.625.md) for the minimum design temperature of the piping, except the material for open ended vent piping may be specially approved by the Commandant (CG-ENG) if:
  - (1) The temperature of the cargo at the pressure relief valve setting is −55 °C (−67 °F) or warmer; and
  - (2) **Liquid cannot discharge to the vent piping.**
- (b) Materials for piping outside the cargo tanks must have a melting point of at least 925 °C (1697 °F), except for short lengths of pipes with fire resisting insulation that are attached to the cargo tanks.

## Notes

### Amendments

[CGD 74-289, 44 FR 26009, May 3, 1979, as amended by 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 USCG-2014-0688, 79 FR 58285, Sept. 29, 2014]