I read an article a while back that explained some of the problems when using PVC for compressed air lines. The article said something about how in a shop (like a garage or paint booth, etc.) compressed air fluctates so often that over time it causes the PVC to become brittle (from expanding and contracting so often). Then, all it takes is something to break the PVC and instead of just cracking it shatters/explodes sending fragments through the air at a spend that could severely hurt you.

Your average PVC pipe should NEVER be used as air line. It is too brittle and has a very good chance of exploding. When PVC pipe explodes, it shatters. Copper is the best way to go, and is easy to work with. Get yourself a small pipe cutter, a small cylinder of MAPP gas or propane, a decent torch tip, solder and maybe some flux. It's easy and fun at the same time.

The only other thing you can safely use besides copper is a plastic pipe similar to your average PVC. I can't remember the trade name for it, but I have used it several times when running air lines at work. The pipe and all fittings are a light blue in color. If I remember correctly it is sized using the metric system. That's the easiest way to tell it apart, next to it being light blue in color. It is a softer type plastic, and if the pipe or fittings rupture, they will split lengthwise and not shatter.

If I could only remember the trade name. :smashpc:

Dear Mr. Cannova:

In response to your recent inquiry concerning our regulatory position on the use of plastic pipe for compressed air systems, I trust this letter will clear up any confusion over the issue.

It is our position that PVC pipe shall not be used as a means of transporting compressed air. This position follows the manufacturer's own statements that PVC is unsuitable for compressed air systems. We do allow the use of certain ABS materials that are specifically designed for compressed air systems. One such product is "Duraplus" air line piping system ABS pipe. However, as in any such system, the manufacturer's specifications on acceptable pressure and temperature considerations must be followed.

In closing, misapplication of a product, such as using PVC for compressed air systems, may result in citations and penalties being issued dependent upon the specific conditions.

I appreciate your concern and inquiry into this potential safety hazard.

It has recently come to my attention that there is a severe safety regarding the improper usage of plastic polyvinyl chloride (PVC) pipe. This pipe is designed for the transmittal of liquids, and is dangerous when used for transmitting compressed air or gas. Unfortunately, PVC has been frequently used with compressed air in construction projects across the country.

The state of Washington has notified the public that PVC pipe is not to be used in compressed air systems. I have also learned that the state of Nevada is in the process of making a similar determination and announcement. Additionally manufacturers of this product advise against its use with compressed air in their catalog publications.

I believe that it is in the best interests of the citizens of our state if your office would expeditiously make such an announcement. A notice to users of the hazards of PVC pipe - when used improperly - would have the effect of preventing possible severe injury to people who work with or near this product.

By way of this letter, I am contacting the Department of Labor, OSHA, in Washington, D.C. and asking their officials to report to me on actions taken on the Federal level to restrict the use of this pipe and to notify users of the potential hazards involved in improper use of PVC pipe.

Your timely consideration of this request is appreciated.