Abstract
A new methodology for the feasible integration of process design and risk assessment is proposed using commercial simulators with the goal of carrying out risk-based process safety management of an existing gas oil separation plant (GOSP). For integration of these two different natures, the concept of static inventory was deduced in order to adjust the dynamic behavior of the fluid in process simulation to accident simulation, considering the flow rate and release duration of the fluid in case of an accident. Particularly for the gas treatment unit (GTU) among the various subsections of the GOSP process, this methodology attempts to assess the potential risk at the preliminary design stage and modify the process design of the existing process to alleviate the major hazard recursively identified during rigorous quantitative risk assessment (QRA). Consequently the modified design with different operation conditions reduces the total risk integrals by 27% at the expense of the additional $50,000 for capital cost. In addition, sensitivity analysis of total risk with respect to probability of success for the isolation process is carried out in order to give insight for a safer and more reliable process design.
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