Risk Mitigation and Control Measures Flashcards

In API-580 RBI, what is the primary criterion used to establish the inspection interval for a given piece of equipment?

Answer: The date risk is calculated to reach the defined risk tolerance threshold

API-580 sets inspection intervals based on when the projected risk is expected to reach the defined risk target, making the interval risk-driven rather than time-fixed.

Which of the following is NOT considered a risk mitigation measure within an API-580 RBI program?

Answer: Increasing the risk tolerance threshold to avoid inspection

Increasing the risk tolerance threshold does not reduce actual risk — it merely adjusts the acceptance criterion and is not an acceptable mitigation strategy under API-580.

How does the installation of a berm or containment dike around a storage tank affect its COF in an RBI assessment?

Answer: It reduces the consequence of failure by limiting the spread of released fluid

A containment berm limits the area impacted by a spill or release, directly reducing the consequence of failure used in the RBI risk calculation.

According to API-580, what is the appropriate next step after implementing a risk mitigation measure?

Answer: Re-evaluate the risk to confirm it now falls within acceptable limits

API-580 requires that after implementing mitigation measures, the risk be re-evaluated to verify that residual risk is within the defined acceptable limits.

What is the significance of the 'risk target date' in an API-580 RBI mitigation plan?

Answer: The future date when risk is projected to reach the acceptable risk threshold if no action is taken

The risk target date is when the risk for a specific piece of equipment is projected to reach the acceptable threshold, defining the latest date by which inspection or mitigation must occur.

In API-580, how does reducing the operating temperature below the brittle fracture transition temperature affect the RBI risk profile for a carbon steel vessel?

Answer: It increases the probability of brittle fracture, raising overall risk

Operating carbon steel vessels below the ductile-to-brittle transition temperature significantly increases the probability of brittle fracture failure, raising the overall risk in the RBI assessment.

Which of the following actions represents an 'active' risk mitigation measure as opposed to a 'passive' one in API-580 RBI?

Answer: Operating corrosion inhibitor injection pumps with continuous monitoring

Active mitigation measures require ongoing operation or monitoring to remain effective; corrosion inhibitor injection requires continuous operation and monitoring to sustain its risk-reduction benefit.