Dennis Hendershot Forum Moderator 21 Posts
Re: PRV design21 December 2006 at 1:29pmSizing of a pressure relief system depends on what the potential causes of overpressure in the system to be protected are. For example: thermal expansion, fire exposure, chemical reaction, pumping into a pipe or vessel with all outlets closed or blocked, etc. You can find a good introduction to sizing of relief devices, including simple equations for certain scenarios, in Crowl and Louvar, Chemical Process Safety Fundamentals with Applications, Prentice-Hall, Upper Saddle River, NJ, 2002, ISBN0-13-018176-5, www.phptr.com, Chapter 8.
Also, there is a much more extensive discussion in the 3rd Edition of Lees' Loss Prevention in the Process Industries, published by Elsevier, Chapter 12. There is also an extensive discussion in Perry's Chemical Engineers Handbook, starting on page 26, which covers the entire process from scenario selection through the design equations.
I want to design a PRV and size the outlet line of the PRV, which goes to a drain header. Is there a method to do it? The maximum operating pressure in the pipe line is 70 psig.
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