Fluid Catalytic Cracking Unit (FCCU) is a major conversion unit in the modem refineries. It converts high boiling range hydrocarbon streams, to more valuable streams such as Gasoline and Liquefied Petroleum Gas (LPG), FCCU's make a major contribution to refineries economical benefits. As such, all refiners try to optimize the operation of this unit. One way to optimize the operation of FCCU is to select the best feed alternatives to the unit, to achieve maximum conversion to valuable streams and to better operate the unit at ultimate safe condition. This paper describes the jeddah Refinery efforts in optimizing the FCCU which switched the feed from the normal "clean & costly" streams to more heavy "dirty" streams. The switch to the heavy "dirty" feed can contribute positively to the refinery economics an amount of 3.5 million dollars annually.
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