PDFWAC 296-826-40015
General requirements for all systems.
You must meet the requirements … | in this section: |
General requirements for all systems | WAC 296-826-40015 |
Nonrefrigerated systems | WAC 296-826-40020 |
Systems mounted on trucks, semi-trailers, and trailers | WAC 296-826-40025 |
(1) 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.
(2) You must make sure all metal flexible connections for permanent installations have a minimum working pressure of 250 psig.
(3) You must make sure all pipes, tubes, and fittings used for ammonia service meet all of the following:
(a) Made of material with a design pressure at least equal to the maximum service pressure.
(b) Well supported and have provisions for all of the following:
(i) Expansion;
(ii) Contraction;
(iii) Vibration;
(iv) Jarring;
(v) Settling.
(4) You must protect all exposed pipes from damage resulting from undue strain including:
(a) Moving machinery;
(b) The presence of vehicles.
(5) You must use ammonia resistant joint compounds.
(6) You must 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.