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Calculating and evaluating the Overall SIL

  • Published on Jan 30, 2025
  • 1 minute(s) read
  • Denis Tkalec
  • Tomislav Renic
  • Iva Vukovic

When all the Initiating Events and Barriers have been defined it is time to calculate and review the Overall SIL.

  • Click the calculate button. Note: It will show red  when a calculation is required.
  • Evaluate the Overall SIL to assess the adequacy of the existing or proposed Barriers against the Hazard Scenario.
  • If the Overall SIL for the Consequence is not acceptable, start a SIF Analysis and determine the SIF’s minimum required RRF, i.e., its Target PFD, that achieves an acceptable Overall SIL level. 
After calculation, review the Overall SIL.

 

Take Note
  • It is possible to batch calculate LOPAs. 
  • Recalculated SIFs will revert to Draft if the SIL level of the SIF Analysis changes or if a new version of the LOPA is created.
  • To perform a batch LOPA calculation, please contact Cenosco Support, as this feature is not yet available to the end user.