Layer of Protection Analysis (LOPA)

Published: | Updated: October 31, 2017

Definition - What does Layer of Protection Analysis (LOPA) mean?

Layer of Protection Analysis (LOPA) is a risk assessment and hazard evaluation method which provides a simplified balance between qualitative process hazard analysis (PHA) and detailed and costly quantitative risk analysis.

The process starts with an identified accident scenario and then makes use of some simplifying rules that allow for the analysis of the initiating event frequency, along with the independent layers of protection. This results in an estimate of risk by order of magnitude.

Safeopedia explains Layer of Protection Analysis (LOPA)

The LOPA technique can be put into place by companies who are striving to achieve a specific risk target or to lower risk as low as reasonably practicable (ALARP). By using the LOPA method, the user is able to ascertain the level of risk that is associated with hazardous events in the workplace. It bases its analysis on the severity of the event and the likelihood of it taking place.

When the level of risk has been determined, then the organization can work out the total amount of risk reduction that is required and the levels of protection that need to be put in place.

This definition was written in the context of Process Safety
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