Reliability Analysis Based on Combination of FTA and FMECA Methods for Reactor- Regenerator System of Abadan Refinery

Long term running of Fluid Catalytic Cracking Unit (FCCU) is critical important to produce more gasoline, diesel oil and natural gas for any oil refinery industries. Reactor and regenerator are two key equipments in FCCU in Abadan refinery. As a pressure vessel, the safety and reliability of reactor and regenerator is a major factor which influences on long term running for factories. Therefore, reliability analysis of reactor-regenerator system is very helpful for prolonging the operating period of the FCCU. Fault tree analysis (FTA), Fault Modes, Effect and Criticality Analysis (FMECA) are two kinds of effective reliability analysis methods respectively. A faulttree mode of reactor-regenerator was established and failure modes were used to find the weakest components in the reactor-regenerator system. A new approach is proposed in this study by combining the FTA and FMECA and the reactor system’s reliability was analyzed quantitatively by the approach. Both an analytical studies and cases verification demonstrated that the proposed new reliability analysis technique works very well for evaluating reliability of FCCU.