What is Layer of Protection Analysis (LOPA)?

Layer of Protection Analysis (LOPA) is recognized as a semi-quantitative risk assessment method. This approach is used to evaluate the effectiveness of various layers of protection designed to prevent or mitigate hazardous events. In LOPA, risk scenarios are analyzed, and the adequacy of existing safety measures, such as safety systems, procedures, and physical barriers, are assessed with a focus on their contribution to risk reduction.

The semi-quantitative nature of LOPA allows practitioners to assign numerical values to certain aspects of risk, such as frequency and consequence, while still providing a framework that incorporates qualitative judgments. This balance enables organizations to assess risk levels and make informed decisions regarding the design and management of safety systems effectively.

In contrast, the other options do not accurately represent what LOPA entails. Evaluating environmental policies pertains to a different field, qualitative techniques focus solely on descriptive aspects without numerical scoring, and a quantitative analysis focused solely on economic factors would not encompass the broader safety considerations integrated within LOPA.