API 510 Risk-Based Inspection Methodology Flashcards
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Read the first 6 API 510 Risk-Based Inspection Methodology flashcards as text
Under API 510 RBI, what is the purpose of identifying the 'credible damage mechanisms' for a pressure vessel?
Answer: To determine which damage mechanisms are active and need to be addressed in inspection planning
Identifying credible damage mechanisms determines which degradation processes are active in the vessel's service environment, ensuring inspections are targeted at detecting those mechanisms.
According to API 571, which damage mechanism is commonly associated with carbon steel pressure vessels in amine treating service?
Answer: Amine stress corrosion cracking
Amine stress corrosion cracking is a common damage mechanism in carbon steel vessels used in amine gas treating services, driven by residual stresses and amine concentration.
In RBI, the term 'remaining life' influences inspection planning by providing what information?
Answer: An estimate of how long the vessel can operate before reaching minimum allowable thickness
Remaining life, calculated from the current thickness and corrosion rate, estimates the time until the vessel wall degrades to the minimum allowable thickness, informing inspection intervals.
What role does process fluid toxicity play in an RBI consequence of failure analysis?
Answer: It elevates the safety/health consequence, increasing overall risk ranking
Toxic process fluids increase the safety and health consequence of a release, raising the CoF component and thus the overall risk ranking of the vessel.
Per API 510, when an RBI assessment is used to extend inspection intervals beyond standard fixed intervals, what is a mandatory requirement?
Answer: The RBI assessment must be documented and approved by qualified personnel, including the AI
API 510 requires that RBI-based interval extensions be supported by documented assessments reviewed and approved by qualified personnel, including the authorized inspector.
In API 581 quantitative RBI, what is the 'generic failure frequency' used for?
Answer: As a baseline probability of failure before applying damage factors
The generic failure frequency serves as the baseline probability of failure for a given equipment type, which is then modified by damage factors to produce the adjusted PoF for RBI calculations.