pipingdesign: Re: CPVC Piping

From: <Geoff>
Date: Thu Oct 17 2002 - 17:20:00 EDT

Hi rakesh,

CPVC is s solvent cemented system. Each pipe length is joined with a socket. It is common practice with such systems to provide a positive support under this socket.

One problem you may encounter is that thermplastics have an expansion coefficient of between 7 & 20 times that of steel. Small bore vertical lines will tend to deflect laterally. Larger bores can impose very high loads even though their modulus is much less than steel. The design philosophy as used for steeel lines has to be employed for these materials. Change of direction will provide relief from thermal expansion, etc etc.

Geoff Stone
--- RAKESH PATIL <rpa@epc.ltindia.com> wrote:

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<tt>

** High Priority ** 
 

Dear All, 
 

I am having following query about CPVC Piping - 
 

For supporting of CPVC pipe, we provides the CS Sleeves with Rubber Bush and support the line on sleeve. Now when line goes in vertical direction, though we put sleeve and support it on that sleeves, still there is tendency of pipe to deflect downward (or u can say slide downward through sleeve) due to it's weight as material is plastic. How to restrict that movement? will it be good to provide either Full Coupling or Break Up Flange before the first sleeve (in downword direction) or between two sleeves mounted on vertical Spool? 
 

I request the experts among all to suggest! 
 

regards, 
rakesh 
 
 
</tt>

 

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<tt>

Texas Flange - a good source for information on industrial flanges, all they ask is for referrals for designs they help with. 877-610-8924. 
www.texasflange.com

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Design Detail and Development (a division of Blenray Pty Ltd) We specialise in pipe network and waterhammer analysis, pipe stress analysis, the design of buried pipelines and thermoplastic pipe systems. Local tel 0402 35 2313 fax 02 8850 2313
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Re: CPVC Piping - urgent