Risk Mitigation and Control Measures Flashcards

What is the primary purpose of risk mitigation in an API-580 RBI program?

Answer: To reduce risk to a level that is tolerable or acceptable

API-580 defines risk mitigation as actions taken to reduce risk to an acceptable or tolerable level, not necessarily to eliminate it entirely.

Which of the following is classified as a probability of failure (POF) reduction measure in API-580 RBI?

Answer: Increasing inspection frequency and coverage

Increasing inspection frequency and coverage reduces the probability of failure by detecting damage mechanisms earlier, directly lowering the POF component of risk.

In API-580, which category of mitigation measure reduces the consequence of failure (COF) rather than the probability of failure?

Answer: Installing emergency isolation valves to limit inventory release

Emergency isolation valves limit the amount of hazardous material released upon failure, directly reducing consequence of failure without affecting the probability.

What is an Integrity Operating Window (IOW) as it relates to RBI risk mitigation?

Answer: A set of established limits on process variables that affect equipment integrity

An IOW defines the acceptable limits for process variables (e.g., temperature, pressure, fluid composition) whose exceedance would accelerate damage mechanisms and increase risk.

According to API-580, how does the implementation of corrosion inhibitor injection affect the RBI risk calculation?

Answer: It reduces the probability of failure by lowering corrosion rates

Corrosion inhibitor injection slows active corrosion, which reduces the predicted corrosion rate and thus lowers the probability of failure used in the RBI calculation.

In an RBI program, what is the correct action when equipment risk exceeds the defined risk target before the next planned inspection date?

Answer: Advance the inspection or implement interim mitigation measures

API-580 requires that when risk exceeds the acceptable target, the inspection must be advanced or interim mitigation actions implemented to return risk to acceptable levels.

Which of the following best describes 'residual risk' in the context of API-580 RBI mitigation?

Answer: Risk remaining after all planned mitigation measures have been implemented

Residual risk is the risk that remains after mitigation measures are applied; API-580 requires this residual risk to be evaluated against acceptance criteria.