Layers of Protection Analysis (LOPA)
Layer of Protection Analysis (LOPA) is used to assess the risk of major accidents by detailed consideration of the safeguards or controls that prevent or mitigate these accidents. LOPA is a semi-quantitative method and fits between simplified qualitative techniques (such as a simple risk matrix) and complete quantitative assessment (QRA). LOPA is often required where a higher degree of quantification of causes and controls is required due to the potential severity of the consequences. LOPA is also the preferred technique for SIL allocation studies due to the clear identification of independent layers of protection.
LOPA provides clear linkages between causes, controls and outcomes, analyses the effectiveness of individual controls and can demonstrate that the controls are adequate against simple risk criteria.
Bow-Tie Consulting’s personnel have experience in facilitating LOPA studies, whether alone or in conjunction with HAZOP studies or SIL allocation studies. Our Exida certified facilitator has undertaken numerous LOPA/SIL assessments and verification studies for clients in Australia and South Korea.
