FOAMSTOP low catalyst impact antifoam saved $2.75 million USD over 17 months Challenges ? Silicon carryover into coker naphtha ? Reduced catalyst life Results ? Reduced silicon carryover approximately 75% ? Decreased silicon defoamer usage by 70% ? Improved refinery operations ? Extended catalyst life ? Maintained coke drum foam control A Gulf Coast refinery experienced high silicon antifoam usage approxi- mately 1 lb [0.5 kg] of silicon per thousand barrels) at the coker while using 60,000 cSt antifoam. This usage rate was well above the refining group’s other locations, which used approximately 0.25 lb of silicon per thousand barrels. As a result, a higher than desired amount of silicon was being carried over into the coker naphtha. In addition, high

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