API-580 Risk Mitigation and Control Measures 2

Question 1

In API-580, which inspection effectiveness category provides the greatest risk reduction credit?

Accepted Answer

Highly effective

Answer

API-580 assigns inspection effectiveness categories ranging from ineffective to highly effective; highly effective inspections receive the greatest credit toward reducing the probability of failure.

Question 2

What happens to the calculated probability of failure (POF) in an RBI assessment as the number of highly effective inspections increases?

Accepted Answer

POF decreases due to the inspection confidence factor applied

Answer

API-580 applies an inspection confidence factor that decreases POF as more highly effective inspections are completed, reflecting greater certainty about the equipment's condition.

Question 3

Which API standard complements API-580 by providing fitness-for-service (FFS) assessment methodology that can be used as a mitigation input?

Accepted Answer

API-579/ASME FFS-1

Answer

API-579/ASME FFS-1 provides the fitness-for-service assessment procedures that can quantify remaining life and justify continued operation, serving as input to RBI mitigation decisions.

Question 4

In API-580 RBI, what is the effect of implementing process changes (e.g., reducing H2S concentration) on the risk profile?

Accepted Answer

It can reduce the probability of failure by mitigating active damage mechanisms

Answer

Reducing concentrations of corrosive species directly slows or eliminates damage mechanisms, reducing the probability of failure in the RBI calculation.

Question 5

What role do Safety Instrumented Systems (SIS) play in API-580 consequence of failure (COF) mitigation?

Accepted Answer

SIS reduce the consequence by automatically isolating or shutting down hazardous releases

Answer

SIS are consequence mitigation systems that can automatically shut down or isolate equipment upon detecting a hazardous condition, reducing the magnitude of a potential release.

API-580 Exam Practice Test

API-580 Exam Practice Test

API-580 Risk Mitigation and Control Measures 2