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WAC 296-307-41513

What requirements apply to safety devices for cylinder systems?

(1) Containers must have safety 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.
TABLE U-7
 
Relief valve start-to-discharge
pressure setting (percent of
regulator delivery pressure)
 
Regulator delivery pressure
Minimum
Maximum
1 psig or less
200
300
Above 1 psig but not over 3 psig
140
200
Above 3 psig
125
200
(3) When a regulator or pressure relief valve is used indoors for other than purposes specified in WAC 296-307-41017(1), the relief valve and the space above the regulator and relief valve diaphragms shall be vented to the outside air with the discharge outlet located at least three feet horizontally away from any building opening that is below such discharge.
Exception:
This requirement does not apply to individual appliance regulators when protection is otherwise provided, nor to WAC 296-307-41509 and 296-307-41025(14). In buildings devoted exclusively to gas distribution, the space above the diaphragm need not be vented to the outside.
[Statutory Authority: RCW 49.17.040. WSR 98-24-096, § 296-307-41513, filed 12/1/98, effective 3/1/99. WSR 97-09-013, recodified as § 296-307-41513, 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-41513, filed 10/31/96, effective 12/1/96.]
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