Environmental Risk Assessment of Gachsaran Oil Refinery Production Unit by Integrating Multi Criteria Decision Making and Environmental Failure-Mode and Effects Analysis

Risk assessment is a method to determine risk quantitative and qualitative and probable accident consequence on people, materials, equipment and environment. By doing so, existence controlling methods effectiveness are specified and valuable data for decision making in risk mitigating is produced.
In this study, GACHSARAN oil refinery production unit is assessed. The purpose of this study is environmental risk assessment of this unit by updating methods and techniques and representing controlling strategies to manage these risks. Simultaneously use of several risk assessment and multi criteria decision making can lead to optimum risk management. To achieve this goal, the Environmental Failure-Mode and Effects Analysis (EFMEA), analytic hierarchy process (AHP) and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) are used.
Findings: At first by site visiting and obtaining expert opinions of the unit, risks are identified and evaluated according to their effects on environmental of five components. In the following, risk priority number in specified and enter to TOPSIS and prioritized.
Discussion and The results showed that important risks are exhausted pollutant from stack and carry over to flare.