# HAR 6-77-64 Vaults: sealing, venting, and ventilation **Citation:** HAR 6-77-64 **Type / status:** regulation / current **Agency:** Hawaii Public Utilities Commission **Effective:** 1994-09-03 **Published:** 1994-04-15 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: (1) When the internal volume exceeds 200 cubic feet: (A) The vault or pit must be ventilated with two ducts, each having at least the ve ## Document text 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: (1) When the internal volume exceeds 200 cubic feet: (A) The vault or pit must be ventilated with two ducts, each having at least the ventilating effect of a pipe four inches in diameter; (B) The ventilation must be enough to minimize the formation of combustible atmosphere in the vault or pit; and (C) The ducts must be high enough above grade to disperse any gas-air mixtures that might be discharged; (2) When the internal volume is more than seventy-five cubic feet but less than 200 cubic feet: (A) 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; (B) If the vault or pit is vented, there must be a means of preventing external sources of ignition from reaching the vault atmosphere; or (C) If the vault or pit is ventilated, paragraph (1) or (3) applies; (3) If a vault or pit covered by paragraph (2) 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 twenty to one, no additional ventilation is required. [Eff ] (Auth: HRS '269-6) (Imp: 49 C.F.R. '192.187, October 1, 1990) ## Provenance - Official: Yes - Source: - Source ID: `hi-puc-har-6-77` - SHA-256: `c0f5969c4fb687cbcc2d1539bec332495af170854b2561d2849ad88dc3aba4c2` - Retrieved: 2026-08-12T08:22:24.168Z - Exported: 2026-08-22T20:58:17.163Z - Document slug: `hi-har-har-6-77-64` ### Source metadata ```json { "jurisdiction": "US-HI", "chapter": "HAR Chapter 6-77", "provisionKind": "section", "adoptedOn": "1994-04-15", "filedOn": "1994-08-24", "exactEffectiveDateAvailableInPublication": true, "publicationStatus": "officially-published-superseded-slated-for-repeal", "phmsaProgramParticipant": false, "stateCertificationRepresented": false, "federalInspectionAndEnforcement": [ "interstate gas", "intrastate gas", "interstate hazardous liquid", "intrastate hazardous liquid" ], "fixedFederalBaseline": "1990-10-01", "editorialModernizationApplied": false, "references": [ { "citation": "49 CFR 192.187", "referenceType": "federal_regulation", "url": "https://www.ecfr.gov/current/title-49/section-192.187", "incorporatedEdition": "1990-10-01" }, { "citation": "HRS 269-6", "referenceType": "state_statute", "url": "https://data.capitol.hawaii.gov/hrscurrent/Vol05_Ch0261-0319/HRS0269/HRS_0269-0006.htm" } ], "caveats": { "exactScope": "Complete substantive text of the Hawaii Public Utilities Commission publication of HAR Chapter 6-77: 196 non-reserved numbered sections and Appendices A through D. Four expressly reserved section slots are inventory-only. The PUC's April 2026 page links a 160-page signed scan; an official 178-page text-layer copy from Budget and Finance is used as the higher-quality transcription aid. The publication is an April 15, 1994 adoption, filed August 24 and effective September 3, 1994, based on the October 1, 1990 federal text; it is not a current restatement of federal pipeline standards.", "applicability": "Hawaii is not represented as certified, as an agreement state, or as an interstate agent under the PHMSA federal-state pipeline safety program. PHMSA states that its Office of Pipeline Safety inspects and enforces federal pipeline safety regulations for interstate and intrastate gas and hazardous-liquid pipelines in Hawaii. Chapter 6-77 may remain relevant as published state utility material, but it must not be used to infer current Hawaii inspection or enforcement authority.", "currentness": "The Hawaii PUC still links Chapter 6-77 on its official rules page, updated April 2026. Hawaii's official 2022 periodic rules-review report separately says Chapter 6-77 is to be repealed, was superseded by statute and a federal takeover letter, and cites 2009 Act 25. Because the PUC page does not mark the chapter repealed, this connector preserves the published text with an explicit superseded/slated-for-repeal warning rather than declaring an unproved completed administrative repeal.", "incorporation": "The chapter repeatedly identifies the October 1, 1990 edition of 49 CFR Parts 191 and 192 and its appendices as the implemented source. That fixed, obsolete baseline is preserved exactly. Current federal text, later amendments, and current editions of incorporated private standards must not be silently substituted when researching what this publication says.", "excludedScope": "This connector excludes HAR Chapter 6-83 one-call damage prevention, utility rates and service standards, statutes as standalone documents, dockets, orders, tariffs, federal text, current federal amendments, and the full text of incorporated private standards. Those materials require separate completeness, currentness, applicability, and rights analysis.", "rights": "Official Hawaii and PHMSA artifacts are retained with attribution and SHA-256 provenance. Public access does not establish unrestricted rights in site presentation, state marks, forms, or incorporated private standards. The connector records citations to private standards but makes no independent rights claim for those works." }, "region": "HI" } ```