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Detectors|Relief valves|Ignition systems (heat engineering)|Valves|Filters|Electrical installations|Gas valves|Burners|Pipe couplings|Pipework systems|Safety measures|Pilot flames|Thickness|Marking|Ratings|Pipes|Safety devices|Rated power|Gas pipes|Pressure regulators|Automatic control systems|Service pressure|Safety valves|Electrical equipment|Pipe fittings|Pressure|Gases|Fire safety|Gas-powered devices|Pipe connections|Leak tests|Gas flow|Fail-to-safety devices|Verification|Flexible pipes|Instructions for use|Air|Gas supply|Gas pipelines|Combustion|Forced-draught burners|Gaseous fuels|Heat engineering components