Layer of Protection Analysis (LOPA)—A Competency That Can Help Your Organization Better Manage Chemical Process Risks

Learn more at SOCMA's National Chemical Safety Symposium (hosted by ChemStewards)

October 11 & 12 | Houston, TX

Facilitated by:
Arthur M. Dowell III, PE
Chemical Process Safety Consultant
Process Improvement Institute

How safe is safe enough? Additional safeguards or independent protection layers can always be added but how can your team decide and defend how many and what type of safeguards or barriers are enough to prevent or mitigate a chemical process event?

LOPA is a tool that focuses risk reduction efforts toward events with the highest risks. It provides a rational basis to allocate risk reduction resources efficiently for a specific scenario.

Scenarios are identified typically using a scenario-based process hazard analysis (PHA) evaluation procedure. For selected higher risk scenarios, LOPA is an analysis tool/approach that can be used to analyze one incident scenario (cause-consequence pair) at a time, using values for the initiating event frequency, independent protection layer failure probabilities, and consequence severity, in order to compare a scenario risk estimate to risk criteria for determining where additional risk reduction or more detailed analysis is needed.

Don't miss out. A case study of a scenario will be presented to guide attendees through an example to illustrate how a LOPA is done to help a team with risk based decisions for a process.

As leaders in the industry, we encourage you and members of your staff to attend SOCMA's National Safety Symposium - hosted by ChemStewards® in Houston, TX. We invite you to join us at this two-day event, set for October 11-12, where we will discuss LOPA during one of our sessions.  To learn more about the agenda and register please visit:

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