Join Date: Jan 2006
Location: North of Phoenix
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We go through this every few months on different forums.
PVC is NEVER to be used for compressed air or any other gases. It can and will explode! The heating and cooling expands and contracts the plastic along with the pressure changes. This weakens the plastic, you don't have to bump it to make it explode, it can do it all by itself.
There is a reason that OSHA will not certify PVC for compressed air systems, they can be deadly. How would you like to have plastic shrapnel in you eyes?
I know I'm going to get the responses of: "I've had it in my shop for years and it's been fine". You're on borrowed time, and if you don't care any more than that for you and your family's safety, there is nothing I can say to change your mind. I wish you the best of luck, you'll need it.
Black iron pipe, Galvanized iron pipe, and Heavy wall copper pipe are the ways to go with this.
I was a pipefitter for 35 years and let me tell you, PVC is NEVER used for compressed gases on a construction project.
My shop at my house in Phoenix is completely made of Galvanized 3/4" pipe. My new shop will be copper pipe, soldered and tested.
PVC is sized just like iron pipe, schedule 80 is thicker than schedule 40, schedule 10 is for lawn sprinklers.
For those of you that have PVC installed already, I just hope you don't let your kids anywhere near it.
But it's a dry heat!