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"How Fluid Characteristic affect 2 phase Relief via PSV on Liquid filled Vessel Exposing to External Fire" has discussed important of understanding of fluid characteristic in determining the potential of two phase Relief in liquid filled vessel.
For a Non-foamy liquid filled vessel with external heat input, theory and experiments have suggested that the PRV relief can be based on ALL VAPOR venting without considering two phases relief. This inline with API Std 521, Jan 2007, Fifth edition, section 5.15.3.3. (click here to read this particular section).
This post would like to bring to you a great short article written by Dr. Fauske from FAI.
This short article discussed the background theory very briefly on the freeboard void fraction, entrainment velocity, overpressure before onset of all vapor venting, determination required flow area for all vapor venting, etc. Two calculation examples have also included in this short article for better understanding. You may find the method pretty useful to determine the vapor mass flux and flow area which eventually can be used to determine the PRV size.
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