# -6 Manholes.

**Citation:** 49 CFR 178.338-6  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(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

## Document text

(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]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-178.338-6>
- Source ID: `ecfr`
- SHA-256: `5104b5fee30178dfada092c1322984a1a0cb46f4b4b4a65493473cd1faad4a0e`
- Retrieved: 2026-08-20T05:46:20.151Z
- Exported: 2026-08-25T05:11:04.465Z
- Document slug: `49-cfr-178-338-6`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "178",
  "section": "178.338-6",
  "subpart": "Subpart J—Specifications for Containers for Motor Vehicle Transportation",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```