Before quantifying risk, you must identify what could go wrong. This typically involves using qualitative tools like Hazard and Operability Studies (HAZOP) or Failure Mode and Effects Analysis (FMEA) to pinpoint "Top Events," such as a toxic gas release or a boiling liquid expanding vapor explosion (BLEVE). 2. Consequence Analysis
Maps the various outcomes following an initial release, accounting for the success or failure of safety systems (e.g., sprinklers or alarms). 4. Risk Summation and Estimation Before quantifying risk, you must identify what could
How do these physical effects impact humans (probit functions) or structures? 3. Frequency Estimation Consequence Analysis Maps the various outcomes following an
Are you analyzing a single storage tank or an entire refinery? A clear boundary prevents "scope creep" and ensures data accuracy. Hazard Identification and Scenario Selection
Tools like PHAST, SAFETI, or Canary are industry standards for modeling complex chemical releases.
A standard QRA workflow involves several technical stages, each requiring rigorous data and modeling. 1. Hazard Identification and Scenario Selection