<VV> Re: Air compressor distribution lines - NO Corvair

[Garth Stapon]

Cryogenic gases increase in volume from approx. 700 - 840 times (varies with the gas type) when they sublimate from their liquid to vapor state.

That could do some serious damage to pvc.

(Just in case you want to know)

Regards, Garth

-----Original Message-----
From: Rt66Vairs at aol.com
Sent: Nov 2, 2005 8:30 AM
To: jekepler at amplex.net, ronh at owt.com, AeroNed at aol.com, virtualvairs at corvair.org
Subject: Re: <VV> Re: Air compressor distribution lines - NO Corvair

 
In a message dated 11/2/2005 2:21:40 A.M. Pacific Standard Time,  
jekepler at amplex.net writes:

My last  word for all the "Flat-Earthers".  They DO make Schedule 80 PVC!
It's  costs more than Sch.40, is a little harder to find, but is STILL
cheaper  than metal, less hazardous to install, and is rated for 2000 psi!
Bet half  you "metal-heads" lament the days of oakum and poured-lead joints,
and  think Aeroquip is just a "fad"!

Oh yes....the ASTM pipe Schedules  include a pressure spec.....anyone here
wanna guess what the pressure-spec  is for Schedule 40 PVC pipe is?

John



!/2" Schedule 40 PVC is rated at 600 PSI.

But is NOT rated for any compressed gas at all.
 
The reason is that liquids under pressure do not expand greatly if  released.
 
Gases do... GREATLY!
 
Even Schedule 80 PVC is not only not rated for compressed gasses but even  
the manufacturers warn you not to use it for that application.
 
It's not allowed by any building code I've ever seen.
 
There must be a reason.
 
I've always had a motto:
 
Use tools and materials for their DESIGNED purpose.
 
Sure, you can get away with it for a while... Some times a long while. But  
someday...
 
I work in a place where we have gases pressurized to as high as 2500  PSI.
 
We have PVC DRAINS on our cooling towers. We have PCV piping for RO Water  
Distribution.
 
That's IT.
 
There is NO PVC used for pressurized gasses anywhere. It would have never  
gotten by even
the greenest inspector.
 
Apparently it would get by several people on this list and God bless them.  
They may need it.
 
Tim ( treading the FLAT Earth) Abney
IECC
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