D351806X012/Sept18 For more information: www.Fisher.com REFINING Plugging Eliminated in Separator Letdown Valve using Special Fisher TM Cavitrol TM III Trim RESULTS • Plugging of the valve by entrained catalysts was elimiminated, improving separator performance and uptime • Flow capacity through separator now meets refinery requirements APPLICATION Separator letdown CUSTOMER Refinery CHALLENGE In a typical refinery, the cold high pressure separator (CHPS) separates the rich hydrogen gas, which is sent to the recycle compressor from the liquid effluent. The liquid phase is separated into recoverable products and sour water. The recoverable products are sent to the fractionation tower or low pressure separator through the CHPS letdown valve. The letdown valve controls the level

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