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49 CFR 193.2517 - Purging. | Regulus

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Regulation documentation

49 CFR Part 193

Location

titleTitle 49 — Transportation subtitleSubtitle B — Other Regulations Relating to Transportation chapterChapter I — Pipeline and Hazardous Materials Safety Administration, Department of Transportation subchapterSubchapter D — Pipeline Safety partPart 193 subpartSubpart F—Operations

11 sections

Subpart A—General10

§ 193.2001Scope of part.§ 193.2003[Reserved]§ 193.2005Applicability.§ 193.2007Definitions.§ 193.2009Rules of regulatory construction.§ 193.2011Reporting.§ 193.2013What documents are incorporated by reference partly or wholly in this part?§ 193.2015[Reserved]§ 193.2017Plans and procedures.§ 193.2019Mobile and temporary LNG facilities.

Subpart B—Siting Requirements7

§ 193.2051Scope.§ 193.2055[Reserved]§ 193.2057Thermal radiation protection.§ 193.2059Flammable vapor-gas dispersion protection.§ 193.2061-193.2065§§ 193.2061-193.2065 [Reserved]§ 193.2067Wind forces.§ 193.2069-193.2073§§ 193.2069-193.2073 [Reserved]

Subpart C—Design16

§ 193.2101Scope.§ 193.2103-193.2117§§ 193.2103-193.2117 [Reserved]§ 193.2119Records § 193.2121-193.2153§§ 193.2121-193.2153 [Reserved]§ 193.2155Structural requirements.§ 193.2157-193.2159§§ 193.2157-193.2159 [Reserved]§ 193.2161Dikes, general.§ 193.2163-193.2165§§ 193.2163-193.2165 [Reserved]§ 193.2167Covered systems.§ 193.2169-193.2171§§ 193.2169-193.2171 [Reserved]§ 193.2173Water removal.§ 193.2175-193.2179§§ 193.2175-193.2179 [Reserved]§ 193.2181Impoundment capacity: LNG storage tanks.§ 193.2183-193.2185§§ 193.2183-193.2185 [Reserved]§ 193.2187Nonmetallic membrane liner.§ 193.2189-193.2233§§ 193.2189-193.2233 [Reserved]

Subpart D—Construction6

§ 193.2301Scope.§ 193.2303Construction acceptance.§ 193.2304Corrosion control overview.§ 193.2305-193.2319§§ 193.2305-193.2319 [Reserved]§ 193.2321Nondestructive tests.§ 193.2323-193.2329§§ 193.2323-193.2329 [Reserved]

Subpart E—Equipment5

§ 193.2401Scope.§ 193.2403-193.2439§§ 193.2403-193.2439 [Reserved]§ 193.2441Control center.§ 193.2443[Reserved]§ 193.2445Sources of power.

Subpart F—Operations11

§ 193.2501Scope.§ 193.2503Operating procedures.§ 193.2505Cooldown.§ 193.2507Monitoring operations.§ 193.2509Emergency procedures.§ 193.2511Personnel safety.§ 193.2513Transfer procedures.§ 193.2515Investigations of failures.§ 193.2517Purging.§ 193.2519Communication systems.§ 193.2521Operating records.

Subpart G—Maintenance20

§ 193.2601Scope.§ 193.2603General.§ 193.2605Maintenance procedures.§ 193.2607Foreign material.§ 193.2609Support systems.§ 193.2611Fire protection.§ 193.2613Auxiliary power sources.§ 193.2615Isolating and purging.§ 193.2617Repairs.§ 193.2619Control systems.§ 193.2621Testing transfer hoses.§ 193.2623Inspecting LNG storage tanks.§ 193.2625Corrosion protection.§ 193.2627Atmospheric corrosion control.§ 193.2629External corrosion control: buried or submerged components.§ 193.2631Internal corrosion control.§ 193.2633Interference currents.§ 193.2635Monitoring corrosion control.§ 193.2637Remedial measures.§ 193.2639Maintenance records.

Subpart H—Personnel Qualifications and Training10

§ 193.2701Scope.§ 193.2703Design and fabrication.§ 193.2705Construction, installation, inspection, and testing.§ 193.2707Operations and maintenance.§ 193.2709Security.§ 193.2711Personnel health.§ 193.2713Training: operations and maintenance.§ 193.2715Training: security.§ 193.2717Training: fire protection.§ 193.2719Training: records.

Subpart I—Fire Protection2

§ 193.2801Fire protection.§ 193.2803-193.2821§§ 193.2803-193.2821 [Reserved]

Subpart J—Security9

§ 193.2901Scope.§ 193.2903Security procedures.§ 193.2905Protective enclosures.§ 193.2907Protective enclosure construction.§ 193.2909Security communications.§ 193.2911Security lighting.§ 193.2913Security monitoring.§ 193.2915Alternative power sources.§ 193.2917Warning signs.

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Subpart A—General10

§ 193.2001Scope of part.§ 193.2003[Reserved]§ 193.2005Applicability.§ 193.2007Definitions.§ 193.2009Rules of regulatory construction.§ 193.2011Reporting.§ 193.2013What documents are incorporated by reference partly or wholly in this part?§ 193.2015[Reserved]§ 193.2017Plans and procedures.§ 193.2019Mobile and temporary LNG facilities.

Subpart B—Siting Requirements7

§ 193.2051Scope.§ 193.2055[Reserved]§ 193.2057Thermal radiation protection.§ 193.2059Flammable vapor-gas dispersion protection.§ 193.2061-193.2065§§ 193.2061-193.2065 [Reserved]§ 193.2067Wind forces.§ 193.2069-193.2073§§ 193.2069-193.2073 [Reserved]

Subpart C—Design16

§ 193.2101Scope.§ 193.2103-193.2117§§ 193.2103-193.2117 [Reserved]§ 193.2119Records § 193.2121-193.2153§§ 193.2121-193.2153 [Reserved]§ 193.2155Structural requirements.§ 193.2157-193.2159§§ 193.2157-193.2159 [Reserved]§ 193.2161Dikes, general.§ 193.2163-193.2165§§ 193.2163-193.2165 [Reserved]§ 193.2167Covered systems.§ 193.2169-193.2171§§ 193.2169-193.2171 [Reserved]§ 193.2173Water removal.§ 193.2175-193.2179§§ 193.2175-193.2179 [Reserved]§ 193.2181Impoundment capacity: LNG storage tanks.§ 193.2183-193.2185§§ 193.2183-193.2185 [Reserved]§ 193.2187Nonmetallic membrane liner.§ 193.2189-193.2233§§ 193.2189-193.2233 [Reserved]

Subpart D—Construction6

§ 193.2301Scope.§ 193.2303Construction acceptance.§ 193.2304Corrosion control overview.§ 193.2305-193.2319§§ 193.2305-193.2319 [Reserved]§ 193.2321Nondestructive tests.§ 193.2323-193.2329§§ 193.2323-193.2329 [Reserved]

Subpart E—Equipment5

§ 193.2401Scope.§ 193.2403-193.2439§§ 193.2403-193.2439 [Reserved]§ 193.2441Control center.§ 193.2443[Reserved]§ 193.2445Sources of power.

Subpart F—Operations11

§ 193.2501Scope.§ 193.2503Operating procedures.§ 193.2505Cooldown.§ 193.2507Monitoring operations.§ 193.2509Emergency procedures.§ 193.2511Personnel safety.§ 193.2513Transfer procedures.§ 193.2515Investigations of failures.§ 193.2517Purging.§ 193.2519Communication systems.§ 193.2521Operating records.

Subpart G—Maintenance20

§ 193.2601Scope.§ 193.2603General.§ 193.2605Maintenance procedures.§ 193.2607Foreign material.§ 193.2609Support systems.§ 193.2611Fire protection.§ 193.2613Auxiliary power sources.§ 193.2615Isolating and purging.§ 193.2617Repairs.§ 193.2619Control systems.§ 193.2621Testing transfer hoses.§ 193.2623Inspecting LNG storage tanks.§ 193.2625Corrosion protection.§ 193.2627Atmospheric corrosion control.§ 193.2629External corrosion control: buried or submerged components.§ 193.2631Internal corrosion control.§ 193.2633Interference currents.§ 193.2635Monitoring corrosion control.§ 193.2637Remedial measures.§ 193.2639Maintenance records.

Subpart H—Personnel Qualifications and Training10

§ 193.2701Scope.§ 193.2703Design and fabrication.§ 193.2705Construction, installation, inspection, and testing.§ 193.2707Operations and maintenance.§ 193.2709Security.§ 193.2711Personnel health.§ 193.2713Training: operations and maintenance.§ 193.2715Training: security.§ 193.2717Training: fire protection.§ 193.2719Training: records.

Subpart I—Fire Protection2

§ 193.2801Fire protection.§ 193.2803-193.2821§§ 193.2803-193.2821 [Reserved]

Subpart J—Security9

§ 193.2901Scope.§ 193.2903Security procedures.§ 193.2905Protective enclosures.§ 193.2907Protective enclosure construction.§ 193.2909Security communications.§ 193.2911Security lighting.§ 193.2913Security monitoring.§ 193.2915Alternative power sources.§ 193.2917Warning signs.

Related 17 Definitions History 30 Authority 42

RegulationsTitle 49Subtitle BChapter ISubchapter DPart 193Subpart F—Operations49 CFR 193.2517

Regulationcurrent

49 CFR 193.2517

Purging.

Snapshot 2026-08-18 Government source

eCFR editorial compilationAuthoritative but unofficial

2 passages

When necessary for safety, components that could accumulate significant amounts of combustible mixtures must be purged in accordance with a procedure which meets the provisions of the “Purging Principles and Practices (incorporated by reference, see § 193.2013)” after being taken out of service and before being returned to service.

[Amdt. 193-2, 45 FR 70405, Oct. 23, 1980, as amended by Amdt. 193-25, 80 FR 183, Jan. 5, 2015]

Previous§ 193.2515 Next§ 193.2519

Related 17 Definitions History 30 Authority 42 Community

Only explicit, source-backed relationships are shown.

Regulations1

LAC 43:XIII §7717

Purging [49 CFR 193.2517]

193.2517 · incorporates or references

Rulemaking7

Pipeline Safety: Periodic Updates of Regulatory References to Technical Standards and Miscellaneous Amendments

193.2517 · cited in rulemaking

78 FR 49996

Pipeline Safety: Periodic Updates of Regulatory References to Technical Standards and Miscellaneous Amendments

193.2517 · cited in rulemaking

75 FR 48593

Pipeline Safety: Periodic Updates of Regulatory References to Technical Standards and Miscellaneous Edits

193.2517 · cited in rulemaking

74 FR 36139

Pipeline Safety: Periodic Updates of Regulatory References to Technical Standards and Miscellaneous Edits

193.2517 · cited in rulemaking

71 FR 33402

Pipeline Safety: Update of Regulatory References to Technical Standards

193.2517 · cited in rulemaking

70 FR 41174

Pipeline Safety: Update of Regulatory References to Technical Standards

193.2517 · cited in rulemaking

69 FR 11330

Pipeline Safety: Liquefied Natural Gas Facilities; Clarifying and Updating Safety Standards

193.2517 · cited in rulemaking

Inspection6

PHMSA LNG.2026.01

2026 LNG IA Question Set

MO.LO.PURGEINERT.P — 193.2517 (+2 more questions) · examined by inspection

PHMSA LNG.2025.01

2025 Lng IA Question Set

MO.LO.PURGEINERT.P — 193.2517 (+2 more questions) · examined by inspection

PHMSA LNG.2024.01

2024 Lng IA Question Set

MO.LO.PURGEINERT.P — 193.2517 (+2 more questions) · examined by inspection

PHMSA LNG.2023.01

2023 Lng IA Question Set

MO.LO.PURGEINERT.P — 193.2517 (+2 more questions) · examined by inspection

PHMSA LNG.2022.01

2022 Lng IA Question Set

Enforcement3

CPF 42025010NOPSO

COVE POINT LNG, LP — Safety Order

193.2517 · cited in enforcement

CPF 520183001

WILLIAMS PARTNERS OPERATING LLC — Notice of Probable Violation

193.2517 · cited in enforcement

CPF 520143001W

TITAN ALASKA LNG — Warning Letter

193.2517 · cited in enforcement

Ask the corpus

Claims link back to retrieved source passages.

Record details

Retrieved: Aug 20, 2026
Version: 2026-08-18

154e8c793bd0fc924d…

MO.LO.PURGEINERT.P — 193.2517 (+2 more questions) · examined by inspection

PHMSA LNG.2021.01

2021 Lng IA Question Set

MO.LO.PURGEINERT.P — 193.2517 (+2 more questions) · examined by inspection