---
kind: "section"
citation: "46 C.F.R. § 154.660"
title: "46"
number: "154.660"
heading: "Pipe welding."
url: "https://uscodex.org/cfr/46/154.660"
---

# §154.660. Pipe welding.

- (a) Pipe welding must meet [part 57](/cfr/46/part57.md) of this chapter.
- (b) Longitudinal butt welds, in piping that does not meet a standard or specification under [§ 56.60-1](/cfr/46/56.60-1.md) of this chapter, and girth butt welds must meet the following:
  - (1) Butt welds of pipes made from carbon, carbon manganese, or low alloy steels must meet [§ 56.50-105](/cfr/46/56.50-105.md) of this chapter, including the requirements for post-weld heat treatment.
  - (2) Except for piping inside an independent cargo tank type A, B, or C, butt welds must be 100% radiographically tested if the design temperature is lower than −10 °C (14 °F), and:
    - (i) The wall thickness is greater than 10 mm (0.394 in.); or
    - (ii) The nominal pipe diameter is greater than 100 mm (nominal 4 in.).
  - (3) If Table 4 references this section, butt welds for deck cargo piping exceeding 75 mm (3 in.) in diameter must be 100% radiographically tested.
  - (4) Butt welds of pipes not meeting paragraph [(b)(2)](#b-2) or [(b)(3)](#b-3) of this section must meet the non-destructive testing requirements under [Subpart 56.95](/cfr/46/subpart56.95.md) of this chapter.

## Notes

### 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.