Quantitative Risk Analyses of Untreated, Vertical Pressure R
Quantitative Risk Analyses of Untreated, Vertical Pressure Relief Venting Using a Computational Fluid Dynamics Simulation (2016)-This paper describes atmospheric anhydrous ammonia gas effects from an untreated pressure vessel relief vent discharging vertically to the atmosphere in an urban area. The primary effect, areal ammonia dispersion, is modeled using computational fluid dynamics software with wind speed and direction varied. In an urban area, where nearby buildings are equally tall or taller than the point of release, local wind fields can be chaotic and direct parts of the ammonia plume down to street level. The diffusion model’s ammonia concentration results are used to estimate public health effects. Assumptions concerning population distribution and likelihood of the release are examined. As a sensitivity study two vent heights were simulated. This work aims to assist the refrigeration community, including its regulators, in quantifying public health risks leading to improved relief vent placement and assessment of the need for relief vent discharge treatment.
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