PVC pipe is not to be used for air lines, with the shatter characteristic, it gets worse the colder it gets. and the problem with people not cleaning and priming joints that can come apart at the wrong times.
The thing most people don't under stand about PVC it is a poly vinyl chloride resin, which is mixed with a filler materiel to take up space and cut down on the amount of resin needed thick profit motive!. The filler of choice currently is chalk dust! yep the same chalk dust of the white cliffs of Dover fame, and the bane of many a school child.
If you check with the makers and sellers etc. I haven't found one that would say use it. Despite the labeling on the pipe. Which is Lab conditions (perfect conditions for a limited amount of time.
The biggest problem is catastrophic failure which it (PVC) is prone to. In the pneumatic temperature control, It was lead pipe, which was then replaced by copper pipe rigid, not tubing. Which again been replaced by Plenum tubing, classified for smoke and flame NFPA 90A
You would be better off using air hose mounted to the rafters with clamps every foot and tee fitting drops.
I had PVC hard piped air line, and had a catastrophic failure twice. Before I removed it, first time the end cap line tap with coupling blew off and put a good dent in the wood joist. At about 100 psi. The second was mid line that shattered and sent sharp PVC shards everywhere. I removed it and now use hoses.
The other problem with it is if you file a claim against damage or injury with you insurance company they will void you policy and not pay the claim.
I'm not interested in starting an argument, with any proponents of Plastic pipe air lines. It is not a good idea.
black pipe, galvanized, copper, or proper sized tubing for pressure and temp. and finally hose is all better choices.
Are low destiny polyethylene air lines
http://www.usplastic.com/catalog/default.asp great assortment of tubing and fittings, fast service and good prices. Just a 30 year customer of them!
glen
