# -5 Stiffening rings.

- **operation:** document
- **citation:** 49 CFR 178.338-5
- **title:** -5 Stiffening rings.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** 2026-08-18
- **summary:** (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
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/49-cfr-178-338-5.json
- **markdown:** https://regulus.evalyn.ai/document/49-cfr-178-338-5.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-178-338-5
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-178.338-5
**body:**

(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]
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- **body characters:** 389