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PDFWAC 296-307-40007

What requirements apply to systems mounted on farm wagons (implements of husbandry) for the transportation of ammonia?

All anhydrous ammonia containers with a capacity of 3,000 gallons or less and equipment mounted on farm wagons (implements of husbandry) that is used to transport ammonia must meet the requirements of this section.
WAC 296-307-40011 through 296-307-40037 also apply unless otherwise noted.
(1) Containers must meet the following mounting requirements:
(a) The farm wagon or container has a stop so the container does not dislodge from its mounting when a farm wagon stops suddenly.
(b) The container is anchored to the farm wagon at one or more places on each side of the container.
(c) The weight of containers mounted on four-wheel farm wagons, is distributed evenly over both axles.
(d) When the cradle and the container are not welded together, material between them eliminates metal-to-metal friction.
(2) Container accessories must meet the following requirements:
(a) Each container has a fixed maximum liquid-level gauge.
(b) All containers with more than 250-gallon capacity have a pressure gauge with a dial graduated from 0-400 psi.
(c) The filling connection is fitted with one of the following:
(i) A combination back-pressure check valve and excess-flow valve; or
(ii) One double or two single back-pressure check valves; or
(iii) A positive shut-off valve that has either an internal back-pressure check valve or an internal excess flow valve.
(d) All containers with more than 250-gallon capacity are equipped for spray loading or with an approved vapor return valve.
(e) All vapor and liquid connections have approved excess flow valves or quick-closing internal valves that are only open for operating.
Exception:
Safety-relief valves and connections that are specifically exempted by WAC 296-307-40019(5) are exempt from this requirement.
(f) Fittings are protected from physical damage by a rigid guard. The guard is designed to withstand force from any direction, equal to twice the weight of the container and lading, at a safety factor of four. If the guard is fully enclosed, the safety-relief valves are properly vented through the guard.
(g) If a liquid withdrawal line is installed in the bottom of a container, the connections and hose are at least as high as the lowest horizontal edge of the farm wagon axle.
(h) Both ends of the hose are secure while in transit.
(3) Each side and the rear end of the container must be marked in letters at least four inches high, with the words "anhydrous ammonia" or, "caution—ammonia," or marked according to DOT regulations.
(4) Farm wagons (implements of husbandry) must meet all state regulations and the following requirements:
(a) All farm wagons must be securely attached to the vehicle drawing them by drawbars with safety chains.
(b) A farm wagon must be constructed so that it will follow the path of the towing vehicle and will prevent the towed wagon from whipping or swerving dangerously from side to side.
(c) All farm wagons must have five gallons or more of readily available clean water.
[Statutory Authority: RCW 49.17.040. WSR 98-24-096, § 296-307-40007, filed 12/1/98, effective 3/1/99. WSR 97-09-013, recodified as § 296-307-40007, 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-40007, filed 10/31/96, effective 12/1/96.]
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