DO NOT, I REPEAT DO NOT EVER USE PVC FOR AIR LINES! Very dangerous. I used to work at a startup company that the owner plumbed with PVC air lines. We were always fixing broken lines, owner thought it was funny when a pipe let go with a shotgun blast. We were constantly asking for new air lines but were told the company couldn't afford the cost of shut down and replacement. One day a guy was working at his desk in an upstairs office when he dropped his pencil and bent over to pick it up. Just then a shutoff valve blow off of an air line right outside his window, through his window and embedded it self in the wall across the room! If he hadn't dropped his pencil, it would have hit him in the head probably killing him.
I, along with the other managers (one of which was the guy that almost got killed), immediately shut down the entire plant. We then went into the owners office and refused to run the place until all PVC was removed and replaced with proper iron pipe. The owner no longer thought it was funny and we got our new air lines!
PVC of any schedule doesn't age well in a shop environment, oil fumes and vibration make it get brittle and BANG.
I will get off of my soap box now, that was just a very scary day in my 50 years of working in shops.
PS: I did work in a small shop with PVC air lines after that, when I told the owner the story, he changed out the PVC for copper.
Richard
