# Thermal barriers.

**Citation:** 49 CFR 193.2215  
**Type / status:** regulation / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 1999-10-01  
**Published:** Not stated

Thermal barriers must be provided between piping and an outer shell when necessary to prevent the outer shell from being exposed during normal operation to temperatures lower than its design temperature.

## Document text

Thermal barriers must be provided between piping and an outer shell when necessary to prevent the outer shell from being exposed during normal operation to temperatures lower than its design temperature.

## Provenance

- Official: Yes
- Source: <https://www.govinfo.gov/app/details/CFR-1999-title49-vol3/CFR-1999-title49-vol3-sec193-2215>
- Source ID: `govinfo-cfr`
- SHA-256: `e3a8436b61aa6824fe6866b2d5b8dd63136d30f1dcd2281b78c7e918f0307917`
- Retrieved: 2026-08-12T01:41:23.231Z
- Exported: 2026-08-22T14:30:09.130Z
- Document slug: `49-cfr-193-2215`

### Source metadata

```json
{
  "part": "193",
  "section": "193.2215",
  "subpart": "Subpart C—Design",
  "annualEdition": 1999,
  "revisedAsOf": "1999-10-01",
  "govInfoPackage": "CFR-1999-title49-vol3",
  "legalStatus": "official-annual-cfr-edition",
  "effectiveDateNote": null,
  "historicalAnchor": true,
  "historicalAnchorNote": "The section appears in an official annual CFR edition but is absent from the connected current eCFR corpus.",
  "jurisdiction": "US"
}
```