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Risk Assessment Methodology Flashcards

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  1. What are the two primary components of risk in API 580 Risk-Based Inspection?

    Answer: Probability of failure and consequence of failure

    API 580 defines risk as the product of probability of failure (PoF) and consequence of failure (CoF). Both must be assessed to prioritize inspection activities and allocate resources effectively.

  2. What is the purpose of a risk matrix in RBI?

    Answer: To visually categorize equipment by risk level for prioritizing inspections

    A risk matrix plots probability of failure against consequence of failure to categorize equipment into risk levels (high, medium-high, medium, low), enabling prioritization of inspection and maintenance resources.

  3. How does RBI differ from traditional time-based inspection?

    Answer: RBI prioritizes inspection based on risk level rather than fixed time intervals

    Unlike traditional approaches that inspect all equipment on fixed schedules, RBI allocates inspection resources based on assessed risk levels, focusing more attention on high-risk items while potentially extending intervals for low-risk equipment.

  4. What role does a damage mechanism review play in an RBI assessment?

    Answer: It identifies all applicable deterioration mechanisms for each piece of equipment

    A damage mechanism review systematically identifies all credible forms of deterioration (corrosion, cracking, metallurgical changes) that could affect equipment based on materials, process conditions, and operating history.

  5. What is a consequence area in RBI analysis?

    Answer: The area potentially affected by a release of hazardous materials following equipment failure

    The consequence area represents the zone that could be impacted by a release event (fire, explosion, toxic exposure), determined by the type and amount of fluid, release rate, and environmental conditions.

  6. Why is management of change (MOC) important in maintaining an RBI program?

    Answer: Process or equipment changes can alter damage mechanisms and risk levels

    MOC ensures that any changes to process conditions, materials, equipment, or operating procedures are evaluated for their impact on damage mechanisms and risk levels, triggering RBI reassessment when needed.

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