Thanks for the responses. That was my understanding of the codes, but our pressure vessel authority in Saskatchewan does not like the B31.9 code and they are trying to tell me that I have to design to B31.3 for any piping system connected to a pressure vessel. I will continue to discuss this...
I am working on a compressed air system for a manufacturing plant. It is to operate at 110psi (relief at 137 psi), 120F max, and piping size up to 4". This seems to all fall very nicely within the B31.9 standard for building services piping. I am intending to use TransAir aluminum piping and...
