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

[A.K. Griffiths]

Actually liquid to vapor is a simple phase change.  Sublimation is  
going directly from a solid to a gas.  Dry ice (CO2) is a good example.

The Artful Dodger
On Nov 2, 2005, at 8:28 PM, Garth Stapon wrote:

> 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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