SQLit wrote:

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I like using 1/2" copper pipe for compressed air, although galvanized is
traditional. Don't use PVC for compressed air.

Best regards,
Bob


Just before Christmas I went to a tire shop and all of their air lines were
schedule 40 PVC.
This system is pressurized during working hours only. I remarked on the
installation to the owner and he said that it was put in just for temporary
4 years ago. Now he fails to see why he should change it. This was the first
installation of pvc for air that I have ever seen.
They were running 90 psi and all 3/4 pipe



There is a lot of energy stored in the air in that pipe when it is
pressurized (unlike a pipe that is pressurized with water.) UV rays
will embrittle the plastic over time unless he used gray schedule 80
pipe, and someday some unfortunate idiot will bump that air line on a
cold morning and it will explode into hundreds of sharp jagged pieces.

It will fail eventually, and the failure mode is rather dramatic.

Regards,
Bob