The Evergreen LOPA Database is a benefit for employees of CCPS Member Companies. In order to access the full database, login here. companies use the values for an IPL or IE listed in the LOPA guideline book ( CCPS,. ), or elsewhere, but without implementing the management systems to. LOPA (Layer of Protection Analysis) is potentially a useful tool in performing risk . Institute of Chemical Engineers Center for Chemical Process Safety (CCPS).
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Other methods, especially Fault Tree, are more appropriate to treat multiple initiating events. Many times simply summing the initiating events is not appropriate due to limitations in the simplifying assumptions behind the development of LOPA.
If you kopa to use multiple initiating events, then use FTA and then ETA to model the scenario; but before you do that learn the ins and Outs of those methods to see how to account for same, how to account for common-cause errors, limitation of the simplifying assumptions, etc.
With that said, many folks companies, as noted by Ricardo invent their own definitions for LOPA outside of CCPSin which case we recommend they invent a new name lpa their method or perhaps say they are using a combo of FTA and LOPA which is normally the combo case they choose ccpz use. And yes it says you can sum scenarios, but it does not say you can sum initiating event frequencies.
There are simple examples which seem to make a case of summing initiating events. But, in a chemical process, many times there are more complex and much more diverse causes of similar but not the same scenarios and the safeguards are not applicable to each cause.
ABS Group Training | Layer of Protection Analysis
Further, many times the causes have common causes such as human error and LOPA limits against inadvertently overlooking common cause human error are very strict.
Remember, if you want to sum initiating events of scenarios, there are other methods available without the simplifying assumptions of LOPA.
Pick the method appropriate for the scenario and goal of the analysis. There are others papers on the loa www. You are welcome to e-mail at wbridges piii.
MULTIPLE CAUSES USED IN LOPA – Process Improvement Institute
If you want to see a discussion of this issue and others related to LOPA, one paper is: By Bill Bridges T He has over 30 years of experience, including more than 20 in senior management and senior PSM advisory roles. Bill is considered one of the leading authorities on process safety engineering, risk management, and human error prevention.
Layer of Protection Analysis
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