Layer of Protection Analysis (LOPA) is a simplified quantitative tool for assessing risk of scenarios
already identified. HAZOP studies often yield a number of scenarios that need further elaboration in
order to demonstrate achieving the target risk. LOPA, being the industry standard, is an easy-to-understand
tool to identify, assess, challenge and document existing risk reduction conditions and
safeguards. It shows whether risk targets are met or exceeded and provides a rational allocation of
equipment and personnel.