API-580 Risk Ranking and Prioritization Flashcards

In API 580, what is the fundamental definition of risk as used in RBI?

Answer: The combination (product) of the probability of failure and the consequence of failure

API 580 defines risk as the product of POF and COF, combining how likely a failure is with how severe its impact would be.

On a typical API 580 qualitative risk matrix, which cell represents the highest risk and receives the most urgent inspection priority?

Answer: High probability of failure combined with high consequence of failure

The highest risk cell in the matrix is where both probability and consequence are at their maximum levels, requiring the most immediate attention.

According to API 580, what is the primary purpose of ranking equipment by risk level in an RBI program?

Answer: To allocate inspection resources preferentially to equipment with the greatest risk, maximizing overall risk reduction

Risk ranking allows a facility to focus limited inspection resources on the equipment items where inspection will produce the greatest reduction in total risk.

In API 580, when an equipment item moves to a higher risk category over time without additional inspection, this is most commonly due to which factor?

Answer: Increasing damage factor as the component ages or corrosion accumulates without inspection credit

Without inspection credit to offset the damage factor, the calculated POF rises over time as damage accumulates, moving the equipment into a higher risk category.

Which of the following correctly describes the concept of 'risk-based inspection intervals' as derived from API 580?

Answer: Inspection intervals are set so that risk does not exceed an acceptable threshold before the next inspection

API 580 uses the target risk threshold to work backward and calculate the maximum time interval before the next inspection is needed to keep risk within acceptable limits.

According to API 580, what action is generally recommended when equipment is found to have 'unacceptable risk' in a risk matrix?

Answer: Implement immediate mitigation or inspection actions to reduce either the POF or COF until risk is acceptable

Equipment in the unacceptable risk region requires prompt action—either reducing POF through inspection/repair or reducing COF through engineering controls—to bring risk to an acceptable level.