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Risk is defined in ISO 17776 as the combination of the frequency of occurrence of an event and the consequences of that event. A Quantitative Risk Assessment (QRA) is considered to be the foundation of process safety and loss prevention.

There are four (4) critical tools needed to complete a risk-based QRA:

1. Individual Risk Contours: Used to characterize individual risk;
2. FN Curves: A requirement used by authorities to estimate the societal risk for facility workforce and/or public located in the surroundings of the process hazardous facility;
3. Exceedance Curves: This approach helps decision-makers to decide which location of interest (i.e., process equipment, building) needs further analysis based on the target being affected by a cumulative frequency of interest by overpressure, thermal radiation, or toxicity hazards; and
4. Risk Indices: Allow the user to conduct valuable statistical and sensitivity analyses.

In this newsletter, Marcel Amorós Martí and Neil Prophet explain how to use these four (4) tools to fully understand the meaning of the risk results after completing a risk-based QRA study.

Bonus!

This newsletter also includes access to a presentation demonstrating several real-world examples predicting a broad scope of process safety problems, ranging from explosion dynamics and pressure relief stability to reaction forces on process and relief piping.

Have a great and safe day.

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