# Purging of Pipelines \[49 CFR 192.629\]

**Citation:** LAC 43:XIII §2729  
**Type / status:** regulation / current  
**Agency:** Louisiana Office of Conservation  
**Effective:** Not stated  
**Published:** Not stated

A. When a pipeline is being purged of air by use of gas, the gas must be released into one end of the line in a moderately rapid and continuous flow. If gas cannot be supplied in sufficient quantity to prevent the formation of a hazardous mixture of gas and air, a slug of inert gas must be released 

## Document text

A. When a pipeline is being purged of air by use of gas, the gas must be released into one end of the line in a moderately rapid and continuous flow. If gas cannot be supplied in sufficient quantity to prevent the formation of a hazardous mixture of gas and air, a slug of inert gas must be released into the line before the gas. [49 CFR 192.629(a)]

B. When a pipeline is being purged of gas by use of air, the air must be released into one end of the line in a moderately rapid and continuous flow. If air cannot be supplied in sufficient quantity to prevent the formation of a hazardous mixture of gas and air, a slug of inert gas must be released into the line before the air. [49 CFR 192.629(b)]

AUTHORITY NOTE: Promulgated in accordance with R.S. 30:501 et seq.

HISTORICAL NOTE: Promulgated by the Department of Natural Resources, LR 9:244 (April 1983), amended LR 10:536 (July 1984), LR 30:1266 (June 2004).

## Provenance

- Official: Yes
- Source: <https://www.doa.la.gov/doa/osr/louisiana-administrative-code/>
- Source ID: `la-osr-lac`
- SHA-256: `f14bc9ebcfb45c3239c64fee417ed7540895c0065ae88bf0e1990d296a522254`
- Retrieved: 2026-08-12T05:03:44.627Z
- Exported: 2026-08-22T22:11:45.703Z
- Document slug: `la-lac-43-xiii-2729`

### Source metadata

```json
{
  "jurisdiction": "US-LA",
  "part": "LAC 43:XIII",
  "section": "2729",
  "pipelineScope": "louisiana-pipeline-safety",
  "legalScope": "Louisiana Office of Conservation pipeline-safety rules governing covered transportation of gas, gas reporting, incorporated and modified federal gas-pipeline requirements, drug and alcohol testing, and LNG facilities.",
  "applicabilityCaveat": "Part XIII applies only within the scope of its certification or agreement, jurisdictional and facility limitations, and section-specific exclusions. Determine operator status, commodity, intrastate or interstate jurisdiction, coastal or Outer Continental Shelf location, gathering classification, LNG status, and federal preemption before applying a provision.",
  "incorporationCaveat": "Part XIII incorporates and modifies portions of 49 CFR Parts 40, 191, 192, 193, and 199. Bracketed federal citations identify the source provision, but Louisiana numbering and text control only within the state rule's scope; consult both current Louisiana and applicable federal text.",
  "historicalNote": "HISTORICAL NOTE: Promulgated by the Department of Natural Resources, LR 9:244 (April 1983), amended LR 10:536 (July 1984), LR 30:1266 (June 2004).",
  "authorityNote": "AUTHORITY NOTE: Promulgated in accordance with R.S. 30:501 et seq.",
  "reserved": false,
  "references": [
    {
      "citation": "49 CFR 192.629",
      "referenceType": "cfr",
      "url": "https://www.ecfr.gov/current/title-49/part-192"
    }
  ],
  "sourceEdition": "December 2025",
  "artifactPath": "data/sources/louisiana/louisiana-lac-title-43-parts-ix-xi-xiii.docx",
  "artifactSha256": "568d6b8b3cc244c67a0c93c040442fa53a1bbdafcb688b253cfa707d84d64259",
  "publicationStatus": "Current state-certified Louisiana Administrative Code compilation; section-level effective dates are not inferred from compilation or monthly history citations.",
  "rights": "The Louisiana Administrative Code is the state-certified publication. Preserve Office of State Register attribution and review Louisiana website terms, agency marks, incorporated standards, and third-party material before redistribution.",
  "region": "LA"
}
```