This paper describes the technique used to evaluate the potential hazards to personnel and equipment in the unlikely event of an accidental release of sour gas from nearby off-shore platforms. These potential impacts arise from the possibility of well blow-outs during the installation and operation of new sulfur mining and oil production platforms in the vicinity of several existing platforms. This evaluation was performed using accident release consequence modeling, and focused on the following potential impacts: inhalation of hydrogen sulfide(H2S) by personnel on the nearby platforms; the extent of the flammable hydrocarbon gas cloud; and the radiant heat from an ignited gas jet. "Worst-case" estimates and assumptions were used in the modeling process to minimize the likelihood of under-estimating any potential impacts.

The gas flammability, and flame radiation hazards were predicted by the modeling system to be confined to the area within 200 ft. (60 m) of the gas release source. The modeling system predicted the potential H2S inhalation hazards to extend from the source a distance of 0.2 to 2.0 miles (0.3 to 3.2 kml. depending on the physical characteristics of the release scenario and the H2S exposure level chosen.

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