---
kind: "section"
citation: "46 C.F.R. § 128.220"
title: "46"
number: "128.220"
heading: "Class II non-vital systems—materials and pressure design."
url: "https://uscodex.org/cfr/46/128.220"
---

# §128.220. Class II non-vital systems—materials and pressure design.

- (a) Except as provided by §§ [128.230](/cfr/46/128.230.md), [128.240](/cfr/46/128.240.md), and [128.320](/cfr/46/128.320.md) of this subpart, a Class II non-vital piping-system need not meet the requirements for materials and pressure design of subchapter F of this chapter.
- (b) Piping for salt-water service must be of a corrosion-resistant material and, if ferrous, be hot-dip galvanized or be at least of extra-heavy schedule in wall thickness.
- (c) Each Class II non-vital piping-system must be certified by the builder as suitable for its intended service. A written certificate to this effect must be submitted with the plans required by [§ 127.110(d)](/cfr/46/127.110.md?p=d) of this subchapter.
- (d) The cognizant OCMI will review the particular installation of each system for the safety hazards identified in paragraphs [(a)](/cfr/46/56.50-1.md?p=a), [(b)(1)](/cfr/46/56.50-1.md?p=b-1), and [(c) through (k)](/cfr/46/56.50-1.md?p=b-c..b-k) of § 56.50-1 of this chapter, and will add requirements as appropriate.

## 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.