# -6 Manholes.

- **operation:** document
- **citation:** 49 CFR 178.338-6
- **title:** -6 Manholes.
- **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) Each tank in oxygen service must be provided with a manhole as prescribed in Section VIII of the ASME Code (IBR, see § 171.7 of this subchapter).

(b) Each tank having a manhole must be provided with a means of entrance and exit through the jacket, or the jacket must be marked to indicate the ma
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- **markdown:** https://regulus.evalyn.ai/document/49-cfr-178-338-6.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-178-338-6
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-178.338-6
**body:**

(a) Each tank in oxygen service must be provided with a manhole as prescribed in Section VIII of the ASME Code (IBR, see § 171.7 of this subchapter).

(b) Each tank having a manhole must be provided with a means of entrance and exit through the jacket, or the jacket must be marked to indicate the manway location on the tank.

(c) A manhole with a bolted closure may not be located on the front head of the tank.

[Amdt. 178-77, 48 FR 27704, June 16, 1983, as amended at 49 FR 24316, June 12, 1984; 68 FR 75754, Dec. 31, 2003]
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- **body characters:** 527