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The Chevron El Segundo Refinery supplies 20 percent of all motor vehicle fuels and 40 percent of the jet fuel consumed in Southern California. In order to make these products, we have three main types of cracking units: The Coker is a thermal cracking unit. It heats the heaviest portion of the crude to a high temperature, causing it to crack into lighter materials. The light materials produced are gasoline, jet fuel and diesel. The light fuels boil off, leaving behind a solid coal-like material called petroleum coke. Petroleum coke is transported to the Port of Los Angeles, where it is shipped to Asia and Europe to be used in heating and manufacturing. The Fluidized Catalytic Cracking Unit (FCC), or “cat cracker,” cracks the heavy material into gasoline, the most demanded transportation fuel. The Hydrocracking Unit is another catalytic cracking unit. Chevron’s patented hydrocracking process is called an ISOMAX Unit.