46 CFR § 128.220 - Class II non-vital systems—materials and pressure design.
---
identifier: "/us/cfr/t46/s128.220"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 128.220 - Class II non-vital systems—materials and pressure design."
title_number: 46
title_name: "Shipping"
section_number: "128.220"
section_name: "Class II non-vital systems—materials and pressure design."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "L"
subchapter_name: "OFFSHORE SUPPLY VESSELS"
part_number: "128"
part_name: "MARINE ENGINEERING: EQUIPMENT AND SYSTEMS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 3306; sec. 617, Pub. L. 111-281, 124 Stat. 2905; Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "CGD 82-004 and CGD 86-074, 62 FR 49331, Sept. 19, 1997, unless otherwise noted."
cfr_part: "128"
---
# 128.220 Class II non-vital systems—materials and pressure design.
(a) Except as provided by §§ 128.230, 128.240, and 128.320 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) of this subchapter.
(d) The cognizant OCMI will review the particular installation of each system for the safety hazards identified in paragraphs (a), (b)(1), and (c) through (k) of § 56.50-1 of this chapter, and will add requirements as appropriate.