The chemical company of a large integrated energy company was developing a corporate standard for layer of protection analysis (LOPA), which incorporated a risk ranking matrix. The company was interested in obtaining an independent review of the design of the risk matrix, and in benchmarking the underlying risk tolerability criteria with generally accepted industry norms.
Our senior risk management specialists met with their LOPA procedure development team and provided guidance on how to define practical frequency and consequence severity categories associated with the risk matrix. In addition, we provided plots of release quantity versus down-wind distance for flammable and toxic chemicals to assist practitioners in identifying events with catastrophic consequences. Finally, we were able to provide similar company (anonymous) tolerability benchmarks for comparison with the client’s internal tolerability criteria.
Utilizing the benchmarking information, the client was able to satisfy upper management that the corporate risk management standard was consistent with those of other companies in their peer group and not overly conservative. Our recommendations regarding the risk matrix improved its ease of use by plant personnel who were not experts in risk assessment, and allowed it to be used for conducting process hazard analyses in addition to LOPA.
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