Industrial accidents have increased the importance of dealing with the risks of toxic exposure, fire and explosion. Despite the measures taken in the chemical industry to prevent accidents, the accidents occur often due to human error or process faults during repairs. Although several studies have been conducted on the accidents in the process industry, no research has modeled the risks caused by the leakage of toxic substances in the gas pressure reduction station. The consequences of gas leak and fire in Zahedan's gas pressure reduction station were investigated in Iran. This research aims to determine the safe range of the station and observe the safety measures required for the gas pressure reduction station in Zahedan. For modelling gas leak and fire, the ALOHA software was used to display the threat zone. In this research, with respect to the environmental data, the desired scenario was modeled. The results, based on two scenarios of gas leak and fire in both hot and cold seasons, indicate that the gas leak scenario in hot seasons and the fire scenario in cold seasons influence a larger region.
In present research, a modified DEA model has been used to evaluate the efficiency of different regions of Fars electricity distribution company in a Fuzzy environment. This model eliminates the weak points of basic models of data envelopment analysis in calculation of a different collection of selected weights for different units. First, the efficiency of electricity distribution units was measured using classical model of data envelopment analysis, and then this action was performed using modified model. In classic model, 5 electricity distribution units out of 18 were considered as efficient areas (about 28%), while in modified model, only 1 unit (about 5.5%) was efficient. The average of unit efficiency in classical model was 0.74, while in modified model it was 0.36. It indicates that this model not only eliminates the mentioned weak point, but also it increases the differentiation potential of classical models.
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