Assessment of individual and collective risk of leakage in South Pars Refinery based on estimation of reproducibility of connections and modeling of PHAST software

In this research, in order to investigate the scope of the effect of two types of fire, Flash Fire and Jet Fire, and to determine the individual and collective risk related to the gas tanks of South Pars refineries, the quantitative risk assessment method was used using PHAST software. To obtain reproducibility for the inlet and outlet valve flange leakage scenario, all connections in the path were examined separately for each scenario and their reproducibility was calculated. The results related to the gas tanks of South Pars refineries showed that among the leaks, the leakage related to the inlet valve flange and the outlet valve flange, according to their location (close to the car parking lot and vehicle traffic road as well as the traffic route) people and buildings around it) is more important. The individual risk contour diagram is the result of the combination of two scenarios, inlet valve and outlet valve, which shows the amount of deaths per year within the specified limits. This means that the collective risk of the area under investigation is high. Considering the conditions in the South Pars Refinery in terms of regional weather conditions, wind speed and direction, prevailing wind direction, the location of the buildings in the station and its population distribution, we come to the conclusion that in the event of a leakage incident, the consequences It is in the form of release of flammable gas and two possible types of fire, Jet Fire and Flash Fire.