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49 CFR 193.2419 - Backflow. | Regulus

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49 CFR Part 193

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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 E—Equipment

23 sections

Subpart B—Siting Requirements6

§ 193.2061Seismic investigation and design forces.§ 193.2063Flooding.§ 193.2065Soil characteristics.§ 193.2069Other severe weather and natural conditions.§ 193.2071Adjacent activities.§ 193.2073Separation of facilities.

Subpart C—Design57

§ 193.2103General.§ 193.2105Extreme temperatures: normal operations.§ 193.2107Extreme temperatures: emergency conditions.§ 193.2109Insulation.§ 193.2111Cold boxes.§ 193.2113Piping.§ 193.2115Concrete subject to cryogenic temperatures.§ 193.2117Combustible materials.§ 193.2121General.§ 193.2123Valves.§ 193.2125Automatic shutoff valves.§ 193.2127Piping.§ 193.2129Piping attachments and supports.§ 193.2131Building design.§ 193.2133Buildings: ventilation.§ 193.2135Expansion or contraction.§ 193.2137Frost heave.§ 193.2139Ice and snow.§ 193.2141Electrical systems.§ 193.2143Lightning.§ 193.2145Boilers and pressure vessels.§ 193.2147Combustion engines and turbines.§ 193.2149Impoundment required.§ 193.2151General design characteristics.§ 193.2153Classes of impounding systems.§ 193.2157Coatings and coverings.§ 193.2159Floors.§ 193.2163Vapor barriers.§ 193.2165Dike dimensions.§ 193.2169Gas leak detection.§ 193.2171Sump basins.§ 193.2175Shared impoundment.§ 193.2179Impoundment capacity: general.§ 193.2183Impoundment capacity: equipment and transfer systems.§ 193.2185Impoundment capacity: parking areas, portable containers.§ 193.2189Loading forces.§ 193.2191Stratification.§ 193.2193Movement and stress.§ 193.2195Penetrations.§ 193.2197Internal design pressure.§ 193.2199External design pressure.§ 193.2201Internal temperature.§ 193.2203Foundation.§ 193.2205Frost heave.§ 193.2207Insulation.§ 193.2209Instrumentation for LNG storage tanks.§ 193.2211Metal storage tanks.§ 193.2213Concrete storage tanks.§ 193.2215Thermal barriers.§ 193.2217Support system.§ 193.2219Internal piping.§ 193.2221Marking.§ 193.2223General.§ 193.2227Backflow.§ 193.2229Cargo transfer systems.§ 193.2231Cargo transfer area.§ 193.2233Shutoff valves.

Subpart D—Construction12

§ 193.2305Procedures.§ 193.2307Inspection.§ 193.2309Inspection and testing methods.§ 193.2311Cleanup.§ 193.2313Pipe welding.§ 193.2315Piping connections.§ 193.2317Retesting.§ 193.2319Strength tests.§ 193.2323Leak tests.§ 193.2325Testing control systems.§ 193.2327Storage tank tests.§ 193.2329Construction records.

Subpart E—Equipment18

§ 193.2403General.§ 193.2405Vaporizer design.§ 193.2407Operational control.§ 193.2409Shutoff valves.§ 193.2411Relief devices.§ 193.2413Combustion air intakes.§ 193.2415General.§ 193.2417Control of incoming gas.§ 193.2419Backflow.§ 193.2421Cold boxes.§ 193.2423Air in gas.§ 193.2427General.§ 193.2429Relief devices.§ 193.2431Vents.§ 193.2433Sensing devices.§ 193.2435Warning devices.§ 193.2437Pump and compressor control.§ 193.2439Emergency shutdown control systems.

Subpart I—Fire Protection10

§ 193.2803General.§ 193.2805Fire prevention plan.§ 193.2807Smoking.§ 193.2809Open fires.§ 193.2811Hotwork.§ 193.2813Storage of flammable fluids.§ 193.2815Motorized equipment.§ 193.2817Fire equipment.§ 193.2819Gas detection.§ 193.2821Fire detection.

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Subpart B—Siting Requirements6

§ 193.2061Seismic investigation and design forces.§ 193.2063Flooding.§ 193.2065Soil characteristics.§ 193.2069Other severe weather and natural conditions.§ 193.2071Adjacent activities.§ 193.2073Separation of facilities.

Subpart C—Design57

§ 193.2103General.§ 193.2105Extreme temperatures: normal operations.§ 193.2107Extreme temperatures: emergency conditions.§ 193.2109Insulation.§ 193.2111Cold boxes.§ 193.2113Piping.§ 193.2115Concrete subject to cryogenic temperatures.§ 193.2117Combustible materials.§ 193.2121General.§ 193.2123Valves.§ 193.2125Automatic shutoff valves.§ 193.2127Piping.§ 193.2129Piping attachments and supports.§ 193.2131Building design.§ 193.2133Buildings: ventilation.§ 193.2135Expansion or contraction.§ 193.2137Frost heave.§ 193.2139Ice and snow.§ 193.2141Electrical systems.§ 193.2143Lightning.§ 193.2145Boilers and pressure vessels.§ 193.2147Combustion engines and turbines.§ 193.2149Impoundment required.§ 193.2151General design characteristics.§ 193.2153Classes of impounding systems.§ 193.2157Coatings and coverings.§ 193.2159Floors.§ 193.2163Vapor barriers.§ 193.2165Dike dimensions.§ 193.2169Gas leak detection.§ 193.2171Sump basins.§ 193.2175Shared impoundment.§ 193.2179Impoundment capacity: general.§ 193.2183Impoundment capacity: equipment and transfer systems.§ 193.2185Impoundment capacity: parking areas, portable containers.§ 193.2189Loading forces.§ 193.2191Stratification.§ 193.2193Movement and stress.§ 193.2195Penetrations.§ 193.2197Internal design pressure.§ 193.2199External design pressure.§ 193.2201Internal temperature.§ 193.2203Foundation.§ 193.2205Frost heave.§ 193.2207Insulation.§ 193.2209Instrumentation for LNG storage tanks.§ 193.2211Metal storage tanks.§ 193.2213Concrete storage tanks.§ 193.2215Thermal barriers.§ 193.2217Support system.§ 193.2219Internal piping.§ 193.2221Marking.§ 193.2223General.§ 193.2227Backflow.§ 193.2229Cargo transfer systems.§ 193.2231Cargo transfer area.§ 193.2233Shutoff valves.

Subpart D—Construction12

§ 193.2305Procedures.§ 193.2307Inspection.§ 193.2309Inspection and testing methods.§ 193.2311Cleanup.§ 193.2313Pipe welding.§ 193.2315Piping connections.§ 193.2317Retesting.§ 193.2319Strength tests.§ 193.2323Leak tests.§ 193.2325Testing control systems.§ 193.2327Storage tank tests.§ 193.2329Construction records.

Subpart E—Equipment18

§ 193.2403General.§ 193.2405Vaporizer design.§ 193.2407Operational control.§ 193.2409Shutoff valves.§ 193.2411Relief devices.§ 193.2413Combustion air intakes.§ 193.2415General.§ 193.2417Control of incoming gas.§ 193.2419Backflow.§ 193.2421Cold boxes.§ 193.2423Air in gas.§ 193.2427General.§ 193.2429Relief devices.§ 193.2431Vents.§ 193.2433Sensing devices.§ 193.2435Warning devices.§ 193.2437Pump and compressor control.§ 193.2439Emergency shutdown control systems.

Subpart I—Fire Protection10

§ 193.2803General.§ 193.2805Fire prevention plan.§ 193.2807Smoking.§ 193.2809Open fires.§ 193.2811Hotwork.§ 193.2813Storage of flammable fluids.§ 193.2815Motorized equipment.§ 193.2817Fire equipment.§ 193.2819Gas detection.§ 193.2821Fire detection.

Related 1 Definitions History 3 Authority 4

RegulationsTitle 49Subtitle BChapter ISubchapter DPart 193Subpart E—Equipment49 CFR 193.2419

Regulationhistorical

49 CFR 193.2419

Backflow.

Current as of 1999-10-01 Government source

Pipeline and Hazardous Materials Safety AdministrationOfficial agency material

1 passages

Each multiple parallel piping system connected to liquefaction equipment must have devices to prevent backflow from causing a hazardous condition.

Previous§ 193.2417 Next§ 193.2421

Related 1 Definitions History 3 Authority 4 Community

Only explicit, source-backed relationships are shown.

Rulemaking1

65 FR 10950

Pipeline Safety: Incorporation of Standard NFPA 59A in the Liquefied Natural Gas Regulations

193.2419 · cited in rulemaking

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Claims link back to retrieved source passages.

Record details

Retrieved: Aug 12, 2026
Version: 1999-10-01

3c3cbaf4e84c9b03cf…