LOPA
Independent protection layers and their effectiveness
Industrial Risks menu → 6. LOPAFor a given scenario, list the independent protection layers (IPLs) and their probability of failure on demand (PFD) to verify that the residual frequency of the feared event is acceptable.
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Screenshot to be added
img/ri-lopa-01.png
What you will do
- Describe the scenario, initiating event and its frequency.
- List applicable IPLs. The tool checks their actual independence before counting them together.
- Add conditional and modifying factors where required; a CCPS library is available.
Pitfall to avoid. Two barriers sharing the same sensor or power supply are not independent and must not be counted as separate IPLs.