# Wrinkle bends in steel pipe.

**Citation:** 49 CFR 192.315  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) A wrinkle bend may not be made on steel pipe to be operated at a pressure that produces a hoop stress of 30 percent, or more, of SMYS.

(b) Each wrinkle bend on steel pipe must comply with the following:

(1) The bend must not have any sharp kinks.

(2) When measured along the crotch of the bend

## Document text

(a) A wrinkle bend may not be made on steel pipe to be operated at a pressure that produces a hoop stress of 30 percent, or more, of SMYS.

(b) Each wrinkle bend on steel pipe must comply with the following:

(1) The bend must not have any sharp kinks.

(2) When measured along the crotch of the bend, the wrinkles must be a distance of at least one pipe diameter.

(3) On pipe 16 inches (406 millimeters) or larger in diameter, the bend may not have a deflection of more than 1 1/2° for each wrinkle.

(4) On pipe containing a longitudinal weld the longitudinal seam must be as near as practicable to the neutral axis of the bend.

[35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-85, 63 FR 37503, July 13, 1998]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-192.315>
- Source ID: `ecfr`
- SHA-256: `a68e12839300f385e22938b398f5d4e2a690c46678bf62b9a9ade76827355455`
- Retrieved: 2026-08-20T05:54:34.435Z
- Exported: 2026-08-22T04:08:24.168Z
- Document slug: `49-cfr-192-315`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "192",
  "section": "192.315",
  "subpart": "Subpart G—General Construction Requirements for Transmission Lines and Mains",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```