I am trying to determine if API 521 speaks to how long a fire needs to last to be considered a valid overpressure scenario. In the particular case that I am reviewing, a small 1 gallon vessel (MAWP = 1,800 psig) may be exposed to an external fire if a hexane spill occurs and ignites near the vessel. The issue is that there is only 4-6 gallons of hexane available, which I am guessing won't sustain a fire for very long. Does anyone know if API 521 provides any guidance on how much flammable material is needed to constitute a valid pool fire? Thanks.
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