# HAR 6-77-70 Requirements for design of pressure relief and limiting devices **Citation:** HAR 6-77-70 **Type / status:** regulation / current **Agency:** Hawaii Public Utilities Commission **Effective:** 1994-09-03 **Published:** 1994-04-15 rupture discs, each pressure relief or pressure limiting device must: (1) Be constructed of materials such that the operation of the device will not be impaired by corrosion; (2) Have valves and valve seats that are designed not to stick in a position that will make the device inoperative; (3) Be de ## Document text rupture discs, each pressure relief or pressure limiting device must: (1) Be constructed of materials such that the operation of the device will not be impaired by corrosion; (2) Have valves and valve seats that are designed not to stick in a position that will make the device inoperative; (3) Be designed and installed so that it can be readily operated to determine if the valve is free, can be tested to determine the pressure at which it will operate, and can be tested for leakage when in the closed position; (4) Have support made of noncombustible material; (5) Have discharge stacks, vents, or outlet ports designed to prevent accumulation of water, ice, or snow, located where gas can be discharged into the atmosphere without undue hazard; (6) Be designed and installed so that the size of the openings, pipe, and fittings located between the system to be protected and the pressuring relieving device, and the size of the vent line, are adequate to prevent hammering of the valve and to prevent impairment of relief capacity; (7) Where installed at a district regulator station to protect a pipeline system from overpressuring, be designed and installed to prevent any single incident such as an explosion in a vault or damage by a vehicle from affecting the operation of both the overpressure protective device and the district regulator; and (8) Except for a valve that will isolate the system under protection from its source of pressure, be designed to prevent unauthorized operation of any stop valve that will make the pressure relief valve or pressure limiting device inoperative. [Eff ] (Auth: HRS '269-6) (Imp: 49 C.F.R. '192.199, October 1, 1990) ## Provenance - Official: Yes - Source: - Source ID: `hi-puc-har-6-77` - SHA-256: `bdfe633257017488729965f8992cd848e81e9c4e9be2eb46b6fb1987485241d9` - Retrieved: 2026-08-12T08:22:24.168Z - Exported: 2026-08-25T02:07:43.632Z - Document slug: `hi-har-har-6-77-70` ### 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 192.199", "referenceType": "federal_regulation", "url": "https://www.ecfr.gov/current/title-49/section-192.199", "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" } ```