# Interior heater systems.

**Citation:** 49 CFR 179.12  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) Interior heater systems shall be of approved design and materials. If a tank is divided into compartments, a separate system shall be provided for each compartment.

(b) Each interior heater system shall be hydrostatically tested at not less than 13.79 bar (200 psig) and shall hold the pressure 

## Document text

(a) Interior heater systems shall be of approved design and materials. If a tank is divided into compartments, a separate system shall be provided for each compartment.

(b) Each interior heater system shall be hydrostatically tested at not less than 13.79 bar (200 psig) and shall hold the pressure for 10 minutes without leakage or evidence of distress.

[Amdt. 179-52, 61 FR 28678, June 5, 1996, as amended by 66 FR 45390, Aug. 28, 2001]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-179.12>
- Source ID: `ecfr`
- SHA-256: `785f9dd66123ce66c3f46b2e2cbae4f389780d5170d9df53ba5eb376a222a436`
- Retrieved: 2026-08-20T05:46:20.606Z
- Exported: 2026-08-23T23:30:43.532Z
- Document slug: `49-cfr-179-12`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "179",
  "section": "179.12",
  "subpart": "Subpart B—General Design Requirements",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```