Plumbing my garage for compressed air...

I have used schedule 40 pvc for 15 years in my garage with no issues.
Use what ever you feel comfortable with.
I do have my compressor on the outside of the garage, so I don't have to listen to the noise. It is in a simple little plywood building to keep it dry.
One thing I would do and that is run a rubber line from the compressor to your hard line for vibration and use a water seperator at the end of each drop.