Northern California Refinery, Sour Naptha Degas Challenge In mid April 2016 a Northern California Refinery discovered a seal leak on a 145 ft. diameter x 75 ft. tall above ground external floating roof storage tank that was in Sour Naptha service. Due to the sour nature of the product in the tank, this seal leak presented substantial safety and environmental hazards to any personnel working at the refinery as well as to the surrounding community. Solution Envent responded quickly to the Northern California Refinery’s emergency and provided a BAAQMD permitted dual column packed bed recirculating H 2 S scrubber along with our EMTOS-2000. Initial concentrations of H 2 S during the degas were ~600ppm at the inlet of the H 2 S scrubber and 0 at the inlet to the EMTOS 2000, thermal oxidizer. Env

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