Some referenece for your review:
1) H. G. Fisher and H. S. Forrest, “Protection of Storage Tanks from Two-Phase Flow Due to Fire Exposure”, Process Safety Progress, Volume 14, No. 3, July 1995, pp 183-199.
2) H. S. Forrest, “Emergency Relief System Design for Fire Exposure with Consideration of Multiphase Flow”, 1995 International Symposium on Runaway Reactions and Pressure Relief Design, ISBN 0-8169-0676-9, Published by American Institute of Chemical Engineers, pp 604-630.
3) H. Mott, B. Sparrow, “A Simple Relief Valve Rating/Sizing Method for Fire Relief from Liquid-filled Vessels”, presentation to API RP-521 Subcommittee, September 30, 2002.