On Tue, 10 Mar 2009 12:03:03 -0500, Ignoramus26567
wrote:

You cannot use regular Sch. 40 PVC pipe for compressed air, as it is
known to explode. The cracks in it run faster than the speed of sound
in compressed air, therefore the appearance is that your entire pipe
exploded at once.

http://www.google.com/search?q=pvc+p...+air+explosion
========
Another problem is that in the case of fire, if the pvc pipe
becomes involved, air pressure may convert the pipe into a flame
thrower spewing molten burning plastic if it doesn't explode.

The price difference with black or galvanized iron is not *THAT*
great and most good hardware stores will cut pipe to length and
thread for you. Be sure to include "drip legs" and blow
down/drain valves at frequent intervals to avoid water in the
lines problems.

Good luck, and let the group know how you make out.
Unka' George [George McDuffee]
-------------------------------------------
He that will not apply new remedies,
must expect new evils:
for Time is the greatest innovator: and
if Time, of course, alter things to the worse,
and wisdom and counsel shall not alter them to the better,
what shall be the end?

Francis Bacon (1561-1626), English philosopher, essayist, statesman.
Essays, "Of Innovations" (1597-1625).