WAC 296-826-40015   General requirements for all systems.  

     You must:

     • Prohibit the use of cast iron fittings.

     – The use of malleable or nodular iron such as Specification ASTM A47 or ASTM A395 is permitted.

     • Make sure all metal flexible connections for permanent installations have a minimum working pressure of 250 psig

     • Make sure all pipes, tubes, and fittings used for ammonia service meet all of the following:

     – Made of material with a design pressure at least equal to the maximum service pressure.

     – Well supported and have provisions for all of the following:

     ▪ Expansion

     ▪ Contraction

     ▪ Vibration

     ▪ Jarring

     ▪ Settling.

     • Protect all exposed pipes from damage resulting from undue strain including:

     – Moving machinery

     – The presence of vehicles.

     • Use ammonia resistant joint compounds.

     • Make sure, after assembly, that all piping and tubing are leak free at a pressure not less than the normal operating pressure of the system.



[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 06-10-067, § 296-826-40015, filed 5/2/06, effective 9/1/06.]