Pressure Rise in Pipe

[RJB32482]

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.

 

[zdas04]

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

 

[RJB32482]

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.

 

[Tonylmiller]

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

 

[Latexman]

RJB32482,

Take a look at thread124-83163 by 25362.


Good luck,
Latexman

 

[Latexman]

and thread135-85389.

Have you used the Search feature on this site yet?

Good luck,
Latexman

 

[Latexman]

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