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Training - LOPA


Application of LOPA

The basic LOPA steps

The basic steps for the LOPA risk assessment typically are:

  1. Identify the consequence

  2. Define the Risk Tolerance Criteria

  3. Define the relevant accident scenario

  4. Determine the initiating event frequency

  5. Identify the conditions, conditional modifiers (if applicable) and estimate the PFD

  6. Estimate the intermediate frequency of unmitigated consequence

  7. Identify the IPLs and estimate the probability of failure on demand for each IPL

  8. Determine the Frequency of Mitigated Consequence

  9. Evaluate the need for additional IPL

  10. Safety Instrumented System (SIS)

The basic steps of the LOPA method will be explained as following.

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