---
kind: "section"
citation: "46 C.F.R. § 154.528"
title: "46"
number: "154.528"
heading: "Piping joints: Flange type."
url: "https://uscodex.org/cfr/46/154.528"
---

# §154.528. Piping joints: Flange type.

- (a) A flange must be one of the following types:
  - (1) **Welding neck.**
  - (2) **Slip-on.**
  - (3) **Socket weld.**
- (b) If the piping is designed for a temperature between −10 °C (14 °F) and −55 °C (−67 °F), the pipe flange may be a:
  - (1) Slip-on type, if the nominal pipe size is 100 mm (4 in.) or less;
  - (2) Socket weld, if the nominal pipe size is 50 mm (2 in.) or less; or
  - (3) **Welding neck.**
- (c) If the piping is designed for a temperature lower than −55 °C (−67 °F), the pipe flange must be a welding neck type.

## 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.