Risk Assessment of Khuzestan Petrochemical unit of Polycarbonate Using of PHA and EFMEA Combination Methods

The aim of this paper is to eliminate, reduce, and control the existing environmental risks developed in Poly Carbonate unite and Epoxy Resin of Khuzestan Petrochemical company by using PHA and EFMEA methods. For this purpose, first, information were collected with library method, then elements producing risk to each of these unites were identified by questionnaire and Likert scale and the degree of their importance were determined. Then, after collecting environmental effects and aspects, the PHA table was completed for both unites separately and according to that method, and the possibility of each risky situation became finalized in terms of brainstorming and with the help of some scoring experts, and finally, risks were categorized into three levels; high, medium, low. In continuation of this assessment, high risks were screened from medium risks of total risks to be assessed in next step by EFMEA method. After conducting statistical calculations in Poly Carbonate unite, it revealed that environmental aspects with priority number higher than 125 have high level of risk that the most risky aspect of this unite is related to releasing Methylene Chloride steam because of leading off-gas to feller in tower, and it results in air pollution. Also, results obtained in Epoxy Resin revealed that environmental aspects with priority number higher than 184 have high level of risk that the most risky aspect of this unite is related to releasing because of Caustic steam because of failing to breaking the sight glass, and it results in air pollution. Second assessment results show environmental aspects and calculated PRN difference and obtained risk level for performances in this Petrochemical company, that using modern methods in identifying and assessing the risk and developing some controlling and mediating actions can reduce the severity of emerging risks and as a result damages into environment significantly. These actions include: visual control by a beneficiary, PM control by a beneficiary, supervising on correct setting of spool, using standard sight glass, examining through laboratory samples and comparing percents with pointer’s status, etc. Keywords: Risk Assessment, Environmental.