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Pressure Rise in Pipe

Pressure Rise in Pipe

Pressure Rise in Pipe

(OP)
I need to brush up on my thermodynamics a little bit:

A pipe is full of styrene (a volume of 45 gallons) and the temperature is raised from 0 F to 80 F.  What is the pressure rise in the pipe?

Is it just the difference in vapor pressure of styrene between the two temperatures?

Thanks.

RE: Pressure Rise in Pipe

The mass remains the same and the density decreases with temperature increases so the volume or pressure must increase.  I don't know the rate of change in density of styrene, but with water the pressure change in a water-filled system is very close to 100 psi per 1F.  If there is a small void space or steam space then the rate of pressure change is orders of magnitude less (it is a steam-table calculation then).

David

RE: Pressure Rise in Pipe

(OP)
Thanks for the reply.  It seems the change in density is about .2 lbs/ft^3 per change in degrees C.  Any help with the calculations?  Is there a specific correlation?

Thanks.

RE: Pressure Rise in Pipe

Assuming the fluid is a liquid, the pressure rise will be tremendous.  You should have a pressure relief system if there is any way the pipe could be blocked off.

Tony Miller
Cornerstone Engineering Group, p.c.
http://www.cegpc.com

RE: Pressure Rise in Pipe

RJB32482,

Take a look at thread124-83163 by 25362.

Good luck,
Latexman

RE: Pressure Rise in Pipe

and thread135-85389.

Have you used the Search feature on this site yet?

Good luck,
Latexman

RE: Pressure Rise in Pipe

thread135-115061 is helpful too.

Of course, if you just use a 3/4" PSV with no calculations, this has no practical value, but it does cure the thirst for knowledge, and knowledge is POWER!

Good luck,
Latexman

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