Environmental Risk Assessment on South Pars Phases 15 and 16 Utility by Using EFMEA Method

This research has been performed in order to identify and assess environmental risks in the construction of Utility Phases 15 and 16 South Pars. After identifying the activities and the process in construction Utility Unit, the amount of gas pollutants CO, NOX, SO2, H2S, and suspended particles in the exit of the chimney of sampled diesel generator and the amount of noise in the sampling stations were measured. The result shows that the amount of air pollution like CO and NOX in some of the sampled stations is higher in comparison with standard amounts. Measuring the amount of noise in the sampled stations also showed that the severity of noise in these stations is higher than the standard. Environmental aspects were identified and assessed by Environmental Failure Mode and Effect Analysis(EFMEA) method, and risk priority number was calculated by multiplying the three parameters severity, occurrence, and detection. 147 environmental risks were identified in Utility construction. 20% of the aspects were low risk, 62% of medium risk, and 18% of them were high risk. The highest RPN is 210 and is related to storage of H2S in Phases 9 and 10 and after that the emergency is of RPN 160. Among the suggested modifying action is using the alarm system when H2S density increases and performing experimenting maneuvers in the storage H2S. Among other suggested modifying actions is to avoid wasting the resources in continuous mitigation of all of the equipment and identifying wasting spots of energy and materials.