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Basis for API 521Heat Absorption Formula (Q)

Basis for API 521Heat Absorption Formula (Q)

Basis for API 521Heat Absorption Formula (Q)

(OP)
1) I am attempting to understand what is the basis for the Heat Absorption Equations (Q) in API 521.  Q= 21,000FA e.82.  Is this based on a worst case commodity with a high heat of combustion?  is it based on Hexane?

2) I am attempting to size tank and vessel relief openings for a process in a nuclear materials facility, where quantities are much lower than a petroleum facility and the liquids generally have lower heat release rates.  Would it be appropriate to use a correction factor for the API Q formula, by including a ratio of the heat of combustion for my commodities to the heat of combustine for Hexane (assuming that is the liquid the API 521 calculation is based upon)?  

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