(1) A filling connection on the container must be fitted with one of the following:
(a) A combination back-pressure check and excess flow valve.
(b) One double or two single back-pressure valves.
(c) A positive shut-off valve, in conjunction with either:
(i) An internal back-pressure valve; or
(ii) An internal excess flow valve.
Instead of an excess flow valve, filling connections may be fitted with a quick-closing internal valve that only opens during operating periods. The mechanism for such valves may have a secondary control that will close automatically in case of fire. The melting point for a fusible plug must be a maximum of 220°F.
(2) A filling pipe inlet terminal off the container must have a positive shut-off valve and either:
(a) A back pressure check valve; or
(b) An excess flow check valve.
(3) All openings in the container must have approved excess flow check valves.
Exceptions: | (a) Filling connections; |
| (b) Safety-relief connections; |
| (c) Liquid-level gauging devices; and |
| (d) Pressure gauge connections. |
(4) All container inlets and outlets must be labeled to designate whether they connect with vapor or liquid (labels may be on valves).
Exceptions: | (a) Safety-relief valves; |
| (b) Liquid-level gauging devices; and |
| (c) Pressure gauges. |
(5) Each storage container must have a suitable pressure gauge.
[WSR 97-09-013, recodified as § 296-307-44005, 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-44005, filed 10/31/96, effective 12/1/96.]