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Submitted Chris Haslego, Nov 21 2011 11:21 AM | Last updated Nov 21 2011 01:29 PM




Category: Safety
Question: How can I determine the heat input to a vessel from a nearby fire?
Keywords: v1i13,fire,case,heat,calculation,vessel,input,underground
Answer: These types of "fire cases" are covered in detail in API RP 520. One of the equations that is used there is:Q = 21,000 F A0.82where:Q = heat absorption, Btu/hA = total wetted surface, ft2F = environmental factorEnvironmental factors, F, are:Bare vessel = 1.0Insulated = 0.30 / insulation thickness, in.Underground storage = 0.0Earth covered above grade = 0.03The height above grade for calculating wetted surface should beA. For vertical vessels - at least 25 ft above grade or other level at which a fire could be sustained.B. For horizontal vessels - at least equal to the maximum diameter.C. For spheres or spheriods - whichever is greater, equator or 25 ft.


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