# Vapor barriers.

**Citation:** 49 CFR 193.2163  
**Type / status:** regulation / historical  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 1999-10-01  
**Published:** Not stated

If vapor barriers are installed in meeting the requirements of § 193.2059, they must be designed and constructed to detain LNG vapor.

## Document text

If vapor barriers are installed in meeting the requirements of § 193.2059, they must be designed and constructed to detain LNG vapor.

## Provenance

- Official: Yes
- Source: <https://www.govinfo.gov/app/details/CFR-1999-title49-vol3/CFR-1999-title49-vol3-sec193-2163>
- Source ID: `govinfo-cfr`
- SHA-256: `fd948b7c06cc732b8c098c6cccbca6976c9f43f8f628bf3151869e356394434e`
- Retrieved: 2026-08-12T01:41:23.231Z
- Exported: 2026-08-24T03:00:10.375Z
- Document slug: `49-cfr-193-2163`

### Source metadata

```json
{
  "part": "193",
  "section": "193.2163",
  "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"
}
```