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January 12, 2003

The impetus for measuring and detecting hydrogen sulfide, H2S, as it relates to the production and distribution of natural gas, is rooted in two primary concerns. The first concern deals with protecting personnel from the lethal effects of H2S. Typically, the maximum pipeline H2S concentration is around 0.25 grains per 100 SCF, nominally 4 ppm/volume. At these concentrations H2S is not lethal and its presence can be detected by the sense of smell with its characteristic rotten egg odor. At the higher lethal H2S concentrations, typically found at production and acid gas removal installations, the nose becomes desensitized. Unable to smell the H2S, a worker breathing such an atmosphere is oblivious to the life threatening danger

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