Quantitative Risk Assessment for a Chemical Facility Case Study The Challenge A client needed to update a prior QRA study from 2015 of their plant with more equipment and buildings. OSHA 29 CFR 1910.119 Process Safety Management (PSM) requires, under the Process Hazard Analysis (PHA) element, that employers conduct a facility siting study to verify that the location and occupancy of buildings, control rooms and trailers have been properly evaluated. Our Approach ioMosaic completed an updated QRA of their plant to determine the peak overpressure, positive phase duration and impulse at the proposed new location of their ammonia building maintenance as a function of the frequency of occurrence. The analysis and documentation were prepared using SuperChemsTM, a component of Process Safety Offi

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