This project is defined to recover the flare gases of flares 2 3 in Catalytic Refining Unit of Abadan Refinery and reusing the recovered gas as the fuel gas Branched flare gas is designed to be routed to the recovery unit (under controlled flow (design flow 2542 kg/ hr In FGRU, the gas will be knocked out and pressurized and then added to refinery s fuel gas system Pressurizing two parallel systems are designed including a compressor system 2 liquid ring compressors 1 spare) and an ejector system 2 ejectors 1 spare) The design is performed on the basis of the selectivity of operating each of compressor/ ejector systems or both of them, based on the available flow and pressure of flare gas.