IT HAPPENED LAST NIGHT !!
My buddy went out to his garage and fired up the heat, lights and compressor to start sanding out his 70 Nova. He went inside while the garage warmed up, and came back out to hear his compressor still running and the air coming out full tilt. The PVC pipe ruptured/split and there were 3 pieces of the pipe missing. It was in the middle of a run, no where near a joint or clamp. One piece was stuck in the back seat, which was covered in plastic, leaning against the wall.
I wonder if it was because it was cold, or dumb luck. It was in there for 3 years. He's done the same warm up deal many times, in colder weather. Makes ya wonder.
Tonight is the trip to Home Depot for 3/4" black iron pipe.