# -9 Compartments.

**Citation:** 49 CFR 178.255-9  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) When the interior of the tank is divided into compartments, each compartment shall be designed, constructed and tested as a separate tank. Thickness of shell and compartment heads shall be determined on the basis of total tank capacity.

(b) [Reserved]

## Document text

(a) When the interior of the tank is divided into compartments, each compartment shall be designed, constructed and tested as a separate tank. Thickness of shell and compartment heads shall be determined on the basis of total tank capacity.

(b) [Reserved]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-178.255-9>
- Source ID: `ecfr`
- SHA-256: `29a6e6927fe79e3d496f3b067e0cf58ce67d2bd43c6ddf2d273610ea74af14f5`
- Retrieved: 2026-08-20T05:46:20.151Z
- Exported: 2026-08-25T02:54:37.397Z
- Document slug: `49-cfr-178-255-9`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "178",
  "section": "178.255-9",
  "subpart": "Subpart H—Specifications for Portable Tanks",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```