# -5 Stiffening rings.

**Citation:** 49 CFR 178.338-5  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) A tank is not required to be provided with stiffening rings, except as prescribed in Section VIII of the ASME Code (IBR, see § 171.7 of this subchapter).

(b) If a jacket is evacuated, it must be constructed in compliance with § 178.338-1(f). Stiffening rings may be used to meet these requiremen

## Document text

(a) A tank is not required to be provided with stiffening rings, except as prescribed in Section VIII of the ASME Code (IBR, see § 171.7 of this subchapter).

(b) If a jacket is evacuated, it must be constructed in compliance with § 178.338-1(f). Stiffening rings may be used to meet these requirements.

[Amdt. 178-77, 48 FR 27704, June 16, 1983, as amended at 68 FR 75754, Dec. 31, 2003]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-178.338-5>
- Source ID: `ecfr`
- SHA-256: `3b5eba6ad906c321b869e7372fc70db4ee8124c462899b4cf1a583303291686e`
- Retrieved: 2026-08-20T05:46:20.151Z
- Exported: 2026-08-25T22:17:19.407Z
- Document slug: `49-cfr-178-338-5`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "178",
  "section": "178.338-5",
  "subpart": "Subpart J—Specifications for Containers for Motor Vehicle Transportation",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```