The EPA Risk Management Plan (RMP) defines a worst-case scenario as the catastrophic release of the entire process inventory in a 10min period (assumed to be a continuous release). The dispersion calculations must be performed assuming F stability and 1.5 m/s wind speed. As part of the RMP rule, each facility must determine the downwind distance to a toxic endpoint. These results must be reported to the EPA and to the surrounding community. A plant has a 100lb tank of anhydrous hydrogen fluoride. The toxic endpoint is specified in the RMP as 0.016 mg/L. Consider the EPA worst case release scenario described above (assume rural conditions) and consider in particular the footprint of the toxic cloud at ground level. (1) Determine the size of the toxic cloud in the downwind direction. (2) Determine the maximum thickness of the toxic cloud in the crosswind direction
The EPA Risk Management Plan (RMP) defines a worst-case scenario as the catastrophic release of the entire process inventory in a 10min period (assumed to be a continuous release). The dispersion calculations must be performed assuming F stability and 1.5 m/s wind speed. As part of the RMP rule, each facility must determine the downwind distance to a toxic endpoint. These results must be reported to the EPA and to the surrounding community. A plant has a 100lb tank of anhydrous hydrogen fluoride. The toxic endpoint is specified in the RMP as 0.016 mg/L. Consider the EPA worst case release scenario described above (assume rural conditions) and consider in particular the footprint of the toxic cloud at ground level.
(1) Determine the size of the toxic cloud in the downwind direction.
(2) Determine the maximum thickness of the toxic cloud in the crosswind direction
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