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The ninth olefin plan of Arya Sasol Petrochemical Company (A.S.P.C.) is  regarded the largest gas Olefin Unit located on Pars Special Economic Energy  Zone (P.S.E.E.Z). Considering the importance of the petrochemical unit, its  environmental assessment seems necessary to identify and reduce potential  hazards. For this purpose, after determining the scope of the study area,  identification and measurement of the environmental parameters, environmental  risk assessment of the unit was carried out using Environment Failure Mode  and Effect Analysis (EFMEA). Using the noted method, sources causing  environmental risks were identified, rated and prioritized. Beside, the  impacts of the environmental aspects derived from the unit activities as well  as their consequences were also analyzed. Furthermore, the identified impacts  were prioritized based on Risk Priority Number (RPN) and severity level of  the consequences imposed on the affected environment. After performing  statistical calculations, it was found that the environmental aspects owing  the risk priority number higher than 15 have a high level of risk. Results  obtained from Low Density Polyethylene Unit revealed that the highest risk  belongs to the emergency vent system with risk priority number equal to 48.  It is occurred due to imperfect performance of the reactor safety system  leading to the emissions of ethylene gas, particles, and radioactive steam as  well as air and noise pollutions. Results derived from secondary assessment  of the environmental aspects, through difference in calculated RPN and  activities risk levels showed that employing modern methods and risk  assessment are have remarkably reduced the severity of risk and consequently  detracted the damages and losses incurred on the environment

Environmental risk assessment of low density polyethylene unit using the method of failure mode and effect analysis