What is one of the main goals when assessing layer effectiveness in LOPA?

The main goal when assessing layer effectiveness in Layer of Protection Analysis (LOPA) is to consider human error and system reliability. This approach involves evaluating all potential layers of protection in a safety system, including both engineered safeguards and human interventions.

Understanding human error is crucial because it acknowledges that people are often the weakest link in safety systems; their decisions and actions (or inactions) can significantly impact the overall safety performance. By incorporating human factors into the analysis, practitioners can identify potential weaknesses in procedures, training, and operational practices, which may not be evident when focusing strictly on technical measures.

Additionally, system reliability is assessed to determine how consistently and effectively safety systems can perform their intended function over time. This involves considering factors like the design of safety systems, maintenance practices, and the inherent reliability of equipment.

In tandem, evaluating both human and system reliability allows for a more comprehensive risk assessment and aids in implementing effective risk management strategies, reinforcing the overall safety of operations.