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PDFWAC 296-307-42005

What requirements apply to valves and accessories, filler pipes, and discharge pipes for non-DOT containers?

(1) The filling pipe inlet terminal must not be located inside a building. For containers with a water capacity of 125 gallons or more, such terminals must be located at least 10 feet from any building, and preferably at least 5 feet from any driveway, and must have a protective housing.
(2) The filling connection must be fitted with one of the following:
(a) Combination back-pressure check valve and excess flow valve.
(b) One double or two single back-pressure check valves.
(c) A positive shut-off valve in conjunction with either:
(i) An internal back pressure valve; or
(ii) An internal excess flow valve.
(3) All openings in a container must have approved automatic excess flow valves unless otherwise exempt.
(4) An excess flow valve is not required in the withdrawal service line if the following requirements are met:
(a) The total water capacity is a maximum of 2,000 U.S. gallons.
(b) The discharge from the service outlet is controlled by a manually operated shut-off valve that is:
(i) Threaded directly into the service outlet of the container; or
(ii) Is an integral part of a substantial fitting threaded into or on the service outlet of the container; or
(iii) Threaded directly into a substantial fitting threaded into or on the service outlet of the container.
(c) The shut-off valve is equipped with an attached handwheel or the equivalent.
(d) The controlling orifice between the contents of the container and the outlet of the shut-off valve is a maximum of 5/16 inch in diameter for vapor withdrawal systems and 1/8 inch in diameter for liquid withdrawal systems.
(e) An approved pressure-reducing regulator is directly attached to the outlet of the shut-off valve and is rigidly supported, or an approved pressure-reducing regulator is attached to the outlet of the shut-off valve by means of a suitable flexible connection, if the regulator is adequately supported and properly protected on or at the tank.
(5) All inlet and outlet connections except safety-relief valves, liquid-level gauging devices and pressure gauges on containers of 2,000 gallons water capacity, or more, and on any container used to supply fuel directly to an internal combustion engine, must be labeled to designate whether they communicate with vapor or liquid space. Labels may be on valves.
(6) Instead of an excess flow valve, openings may be fitted with a quick-closing internal valve that must remain closed when not in operation. The internal mechanism for such valves may have a secondary control that must have a fusible plug (not over 220°F melting point) that will cause the internal valve to close automatically in case of fire.
(7) A maximum of two plugged openings may be used on a container of 2,000 gallons or less water capacity.
(8) Containers of 125 gallons water capacity or more manufactured after July 1, 1961, must have an approved device for liquid evacuation, the size of which must be 3/4 inch national pipe thread minimum. A plugged opening does not satisfy this requirement.
[WSR 97-09-013, recodified as § 296-307-42005, 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-42005, filed 10/31/96, effective 12/1/96.]
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