1012-1013 / 1143
Copyright © Risknowlogy®. All rights reserved. v9
Other points to consider
‣
Are you sure the non-SIS installed IPL’s are providing the risk reduction you need?
‣
Are the assumptions you made in the HAZOP / LOPA still true? (?Check
assumptions at proof test time?)
‣
Issues I haven’t thought through yet
‣
Redundancy in the “black box”
‣
Statistical confidence of historic data (same as prior use?)
17