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Abstract
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The present study evaluates the risk of the gasoline tank of the National Iranian Oil Product Distribution
Company (NIOPDC) in Sari region using process hazard analysis software tool (PHAST) and according
to the environmental and process data of the unit. The consequences of different scenarios such as small
and medium leakage, constant release rate and complete rupture were modeled and then the range of
each one was obtained according to the intensity of radiation or pressure wave and the safe distances of
each was determined. Due to the consequences of the explosion, the worst results were related to the
weather conditions of 2/3 F for 4700, 2400, and 2300 meters, respectively. Also, based on eruptive and
sudden fire data, the intensity of radiation which corresponds to the immediate death or destruction of
equipment was seen in climatic conditions of (2/3 F and 4/1 D), at intervals of 180 and 160 meters
distances, respectively. In these two weather conditions flammability intervals were 10520 and 450
meters. Then, by combining the severity of these accidents with the distribution of the population and
the probability of their occurrence, the level of risk for these storages was determined
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