I have over 400 feet of 1" schedule 40 pvc pipe in my shop, 10 years of use at 175 lbs air pressure.
I did my two car garage 20 yrs ago, 125 psi, it's 175 now that I connected it to my shop compressor.
Our farm shop has 200' of same, at 175 psi, 20 years old.
I have two friends with 50'X100' shops that are done in the same type/size pipe, probably 300' each, they are 15 yrs old and at 175 psi.
Schedule 40 is rated at 450 psi, the glue is important for strength of the joints, as the joints are weaker than the pipe.
Heat can weaken the pipe too, I live in a coastal area and it doesn't get to 100 degrees but a couple of days a year.
I used the two step primer/grey glue proccess. My buddies used the clear one step glue.
I ran my pipe overhead in the roof perlins wtih drop pipes down the walls, so most of the pipe is 20' above my head, only the drops are near anyone.
Smaller dia pipe is even higher pressure rating.
I hear all the time how bad PVC is for compressed air, and I certainly don't want to be around one if it blows...
But I've seen it work with no problems at all in my area. Maybe if I'd read all the warnings before having good results, I'd have used something else, but my experience runs contrary to the warnings.
PVC has a great insulating quality that reduces heat transfer, the pipe is inert and doesn't give off rust or metal flakes.
It is easy to upsize the pipe to 1" and gain air storage capacity if you have a smallish air tank.
I left a foot of drop below the wall outlet fitting, and put a draincock on it to catch moisture.
If you put a ball valve on each air fitting and close off the unused fittings, the air will stay in the system with out bleeding down overnight.
The quick couplers all leak very slightly, if an air hose is plugged in to one, it leaks even more. If you only have one or two couplers, it isn't a big deal, but in a shop with 10 or 20, it can leak down a lot.
Check my web page for First Gen Camaro suspension info:
David's Motorsports page
First Gen Suspension Page
67 RS 327 original owner. 69 Camaro Vintage Racer, 65 Lola T-70 Chev SB Can-Am Vintage Racer