---
kind: "section"
citation: "46 C.F.R. § 128.450"
title: "46"
number: "128.450"
heading: "Liquid-mud systems."
url: "https://uscodex.org/cfr/46/128.450"
---

# §128.450. Liquid-mud systems.

- (a) Liquid-mud piping systems may use resiliently seated valves of Category A to comply with §§ [56.20-15](/cfr/46/56.20-15.md) and [56.50-60](/cfr/46/56.50-60.md) of this chapter.
- (b) Tanks for oil-based liquid mud must be fitted with tank vents equipped with flame screens. Vents must not discharge to the interior of the vessel.

## Notes

### Authority

Authority: 46 U.S.C. 3306; sec. 617, Pub. L. 111-281, 124 Stat. 2905; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 82-004 and CGD 86-074, 62 FR 49331, Sept. 19, 1997, unless otherwise noted.