Amnonia pipe minimum wall thickness

Hello all.

There is an Ammonia Industrial Refrigeration system, with a low pressure side (Receiver and evaporator) and works about at 200 psi, we specified a 14" seamless STD pipe carbon steel A-106 gr X42 ( wall 0.375" ) .

Someone is argued that a minimum of Schedule 40 pipe is needed at ( wall 0.438" ), temperature pressure is not a problem he said , Corrosion is the thing to watch out.

So the question is, where can I find the standard norm for correction for corrosion for industrial ammonia for the pipe wall? ( the factor I used was 1/64" ) .

Thank you.

Arturo Murillo.

[Non-text portions of this message have been removed] Received on Wed Mar 31 11:32:00 2004