Selection of ammonia pipeline materials and valve selection
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I have a question for the experts: For an ammonia pipeline with a working pressure of 1.88 MPa and a working temperature of 80°C, what type of pipeline material should be used? What kind of valves should be used on the pipes?
20# seamless pipe, ammonia stop valve.
Is carbon steel also used as the material for the shut-off valve for ammonia?
Just choose according to the standard. GB/T 26478-2011 \"Isolating valves and lift-type check valves for ammonia\"
The materials used for liquid ammonia and gaseous ammonia are also quite ordinary, namely grade 20 steel. You can look up the product manuals for pipeline materials from China’s Five Rings and Sichuan Chengda on the Internet to verify this information. However, when welding pipelines, it is important to carry out stress-relief treatment after welding, as ammonia is a medium that readily causes stress corrosion.
Ammonia itself is not a corrosive medium, so 20# steel can be used for the pipeline material; however, if the ammonia contains water, it is better to use stainless steel
I only know about valves; for ammonia, globe valves are used. Their features are roughly as follows: 1. The sealing surfaces are made of PTFE (babbitt), which ensures good sealing performance and a long service life. 2. The middle flange has a male-female design, and the valve stem is connected using a hidden stem mechanism. 3. The sealing surface of the valve body is spherical and convex, fitting with the valve disc to achieve sealing. 4. Copper metal ； aluminum ； Plastics and rubber, among others, are not allowed to come into direct contact with ammonia