Louisiana Refinery, H2S Vapor Control, Recirculating Vapor Scrubbers Challenge A refinery with a sour water tank high in H2S needed vapor control provided during a turnaround while maintenance was done in the surrounding area. The H 2 S concentration was as high as 500,000 ppmv during parts of refinery operations. The H 2 S needed to be reduced to a safe level while the vapors were treated and vented to atmosphere. Solution Vapors from the tank were routed to a liquid recirculating scrubber, which reduced the H 2 S concentration to an acceptable limit to where the vapors could be sent to a thermal oxidizer. Envent monitored the inlet and outlet of the liquid scrubber to ensure efficient reduction of the H 2 S. When liquid break through was approached, the media was changed out to guarantee

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