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In analyzing pool fires and the potential for domino effects, the most important aspects to be addressed on the basis of a proper consequence analysis are the evaluation of thermal radiation, the issues of interplant spacing, the employees’ safety zones and fire wall specifications. Even if scientific literature on pool-fire is sparse and modeling is well developed, the usual approach considers circular geometry, pseudo steady-state conditions, uniform flame temperature, cylindrical/conical flame shape with height depending on pool diameter. The specific analysis of rather complicated situations (partial confinement, irregular shapes, complex kinetics, heavy hydrocarbon fire, unsteady-state) usually requires the use of sophisticated integral models and/or time consuming CFD calculations, but when conservative results are enough, analytical models can be more useful especially in hazard assessment. We propose a modelling of a pool fire of a multi-component hydrocarbon mixture, under semi-confined geometry. The physical model of the pool is solved to provide a description of a variable heat emitting flame area, as a function of the vertical flame axis, thus representing a peculiar novelty of the approach. Starting from a real accident in a downstream oil industry involving pool fire of a heavy liquid HC mixture and domino effect, the application to an industrial case study is presented, in order to evidence the effective potentialities of the method.

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