Howdy,

Can anyone tell me what is required for NH3 pipe schedules. I know that if I run anything less than 2" it needs to be schedule 80 seamless. Pipes from 2" to 6" schedule 40 seamless or ERW. But what about piping above 6" in diameter? It really gets confusing on these pipe sizes. Where can I find this information? ANSI/IIAR 2 1999 is blowing me away as it is calling out pipes that are schedule 20 and even schedule 10. I have been taught that pipes 12" and above should be standard wall. I cant find any code to back this up though.

Thanks in advance.