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air plumbing

Subject: air plumbing
From: (Chris Kantarjiev)
Date: Mon, 8 Apr 96 11:29:46 PDT
There's a discussion of this over on rec.crafts.metalworking, started
by the usual question of "is PVC OK". The concensus is still no,
but a new reason or three have cropped up:

* PVC brittles with age; the plasticizer evaporates over time
* Oil in the compressed air attacks the plasticizer
* Compressed gasses store much more energy than uncompressed liquids,
  so failure is much more catastrophics (the "grenade" effect)
* PVC pipe melts in a fire, leading to hazardous conditions for firefighters

This last reason is apparently why it is against many local, business
and OSHA regulations.

It's also a reason not to use copper - the soldered joints may/will
melt in a fire. The failure mode isn't as catastrophic, but it could
result in a pipe jumping around a lot. 

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