A total of 6 hazards were reviewed in detail with an average of 5-8 threats. Controls were identified and the effectiveness of controls compared to similar controls in the base data set. This allowed establishing an equivalency of controls. A second weighting applied to the risk contribution so that higher risk threats were weighted more than lower risk threats. A total weighted modification factor was developed based on the number of controls deployed, their effectiveness, and the risk importance of each threat. When applied to a refinery, this gave a modification factor of 2, thus local frequencies should be multiplied by 2 compared to the base data set. In practice since North Sea leak data is improving, this should be interpreted that onshore refineries tend to be 6-8 years behind the North Sea in generic leak data.
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