PDFWAC 296-307-40023
Specifications for hoses.
(1) Hose used in ammonia service and subject to container pressure must meet the requirements of the joint Rubber Manufacturers Association and the Fertilizer Institute "Hose Specifications for Anhydrous Ammonia."
(2) Hose subject to container pressure must be designed for a minimum working pressure of 350 psig and a minimum burst pressure of 1750 psig. Hose assemblies must be able to withstand a test pressure of 500 psig.
(3) Hose and hose connections on the low pressure side of flow control or pressure reducing valves on devices discharging to atmospheric pressure must be designed for the maximum low side working pressure. All connections must be designed, constructed, and installed to prevent leaks when connected.
(4) Where liquid transfer hose is not drained after transfer operations, the hose must have an approved shut-off valve at the discharge end. The employer must provide a method to prevent excessive hydrostatic pressure in the hose. (See WAC 296-307-40025.)
(5) On all hose 1/2-inch outside diameter and larger, used for the transfer of anhydrous ammonia liquid or vapor, the employer must ensure that the following information is etched, cast, or impressed at five-foot intervals:
(a) Anhydrous ammonia;
(b) xxx psig (maximum working pressure);
(c) Manufacturer's name or trademark;
(d) Year of manufacture.
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-40023, filed 10/20/20, effective 11/20/20. Statutory Authority: RCW 49.17.040. WSR 98-24-096, § 296-307-40023, filed 12/1/98, effective 3/1/99. WSR 97-09-013, recodified as § 296-307-40023, 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-40023, filed 10/31/96, effective 12/1/96.]