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WAC 296-307-43511

What requirements apply to safety devices?

(1) DOT containers must have safety-relief devices as required by DOT regulations.
(2) A final stage regulator of an LP-gas system (excluding any appliance regulator) must have, on the low-pressure side, a relief valve that is set to start to discharge within the limits specified in Table U-7.
(3) The relief valve and space above the regulator and relief valve diaphragms must be vented to the outside air and terminate at a position to minimize the possibility of vapors accumulating at sources of ignition.
(4) Whenever equipment such as a cargo heater or cooler on commercial vehicles is designed to be in operation while in transit, suitable means to stop the flow such as an excess flow valve or other device, must be installed. This device will be actuated to stop the flow in the event of the break in the fuel supply line. All excess flow valves must comply with WAC 296-307-41019(3).
[Statutory Authority: RCW 49.17.040. WSR 98-24-096, § 296-307-43511, filed 12/1/98, effective 3/1/99. WSR 97-09-013 recodified as § 296-307-43511, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-43511, filed 10/31/96, effective 12/1/96.]
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