# Vaults: Sealing, Venting, and Ventilation

**Citation:** 192.187  
**Type / status:** regulation / current  
**Agency:** Arkansas Public Service Commission  
**Effective:** Not stated  
**Published:** Not stated

§ 192.187 Vaults: Sealing, Venting, and Ventilation Each underground vault or closed top pit containing either a pressure regulating or reducing station, or a pressure limiting or relieving station, must be sealed, vented, or ventilated, as follows: (a) When the internal volume exceeds 200 cubic fee

## Document text

§ 192.187 Vaults: Sealing, Venting, and Ventilation Each underground vault or closed top pit containing either a pressure regulating or reducing station, or a pressure limiting or relieving station, must be sealed, vented, or ventilated, as follows: (a) When the internal volume exceeds 200 cubic feet (5.7 cubic meters): (1) The vault or pit must be ventilated with two ducts, each having at least the ventilating effect of a pipe 4 inches (102 millimeters ) in diameter; (2) The ventilation must be enough to minimize the formation of combustible atmosphere in the vault or pit; and (3) The ducts must be high enough above grade to disperse any gas-air mixtures that might be discharged. (b) When the internal volume is more than 75 cubic feet (2.1 cubic meters) but less than 200 cubic feet (5.7 cubic meters): (1) If the vault or pit is sealed, each opening must have a tight fitting cover without open holes through which an explosive mixture might be ignited, and there must be a means for testing the internal atmosphere before removing the cover; (2) If the vault or pit is vented, there must be a means of preventing external sources of ignition from reaching the vault atmosphere; or (3) If the vault or pit is ventilated, paragraph (a) or (c) of this section applies. (c) If a vault or pit covered by paragraph (b) of this section is ventilated by openings in the covers or gratings and the ratio of the internal volume, in cubic feet, to the effective ventilating area of the cover or grating, in square feet, is less than 20 to 1, no additional ventilation is required.

## Provenance

- Official: Yes
- Source: <https://codeofarrules.arkansas.gov/Rules/Rule?chapterID=40&levelType=part&partID=1394&subChapterID=392&titleID=23>
- Source ID: `ar-car-pipeline-safety`
- SHA-256: `1afcb33601ff12207cfc13f8afca6d0730d080158f50e861a63a706a19503b6f`
- Retrieved: 2026-08-12T08:10:37.612Z
- Exported: 2026-08-23T05:37:20.540Z
- Document slug: `ar-car-23-500-192-187`

### Source metadata

```json
{
  "jurisdiction": "US-AR",
  "subject": "intrastate-gas",
  "caveats": {
    "exactScope": "The searchable corpus contains every current numbered section, the code-wide definitions, and every operative appendix in official 23 CAR Part 500, plus direct pipeline rules 15 CAR sections 275-406 and 275-504. Reserved and removed provisions are inventory-only.",
    "excludedScope": "This is not all Arkansas pipeline law. Standalone statutes, dockets and orders, one-call law, utility rates and service, siting, environmental permits, highway crossings, local law, forms, and incorporated third-party standards are excluded. Other current AOGC gas and transportation rules are inventoried as adjacent production, conservation, storage, or fluid-transport material.",
    "applicabilityCaveat": "APSC administers certified intrastate gas safety downstream of producer custody transfer. AOGC section 275-406 separately reaches specified producer or producer-affiliated natural-gas systems. AOGC section 275-504 imposes state permitting and operational duties on specified hazardous-liquid pipelines, but PHMSA states that it directly inspects and enforces intrastate hazardous-liquid pipeline safety in Arkansas. Inclusion does not establish applicability to a particular facility.",
    "incorporationCaveat": "AOGC sections 275-406 and 275-504 use dynamic 'as amended' wording for federal Parts 190, 191, 192, 195, and 199. Part 500 is a state code that reproduces and modifies federal-derived gas provisions. References and relationship records do not substitute a retrieval-date federal text or decide the legal effect of incorporation.",
    "publicationCaveat": "The Code of Arkansas Rules identifies its online database as the official version, effective as a publication system January 1, 2025, updated weekly, and potentially behind recent agency rulemaking. The official Part 500 page reports Ark. R. 2026-6 effective January 8, 2026; its PDF is headed August 22, 2025 and Docket 25-025-R. Retrieval and site-update dates are publication observations, not inferred legal effective dates for every section.",
    "rights": "Official Arkansas and federal government artifacts are archived with attribution and SHA-256 provenance. Public access does not settle rights in seals, site presentation, forms, incorporated standards, or third-party material; downstream redistribution requires separate review."
  },
  "rightsReviewRequired": true,
  "references": [],
  "codePart": "23 CAR pt. 500",
  "partEffectiveOn": "2026-01-08",
  "partEffectiveDateNotImputedToIndividualProvision": true,
  "federalDerivedStateCode": true,
  "sourceCollection": "ar-car-23-part-500",
  "region": "AR"
}
```