Practice Test Geeks(API 510) Certified Pressure Vessel Inspector Practice Test
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Code Compliance & Safety Regulations Flashcards

7 cards from real API 510 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. API 510 requires that pressure vessels operating at temperatures above 750°F (400°C) in hydrogen service be assessed for:

    Answer: High-temperature hydrogen attack (HTHA) per API 941

    API 941 (Nelson Curves) guides assessment of High-Temperature Hydrogen Attack risk for vessels operating in hydrogen service at elevated temperatures.

  2. When applying an RBI program under API 510, the inspection interval derived from RBI must not exceed the maximum interval defined by:

    Answer: API 510 Section 6 maximum intervals

    Even with RBI justification, API 510 Section 6 establishes absolute maximum inspection intervals that cannot be exceeded regardless of low calculated risk.

  3. Under API 510, pressure relief devices (PRDs) protecting pressure vessels must be set at or below:

    Answer: The MAWP of the protected vessel

    PRDs must be set to open at or below the vessel's MAWP to prevent operation above the rated pressure.

  4. According to API 510, a pressure vessel inspector's primary obligation when safety and production schedules conflict is to:

    Answer: Prioritize safety and code compliance over production schedules

    API 510 is explicit that the inspector's primary duty is to ensure safe and code-compliant operation, which takes precedence over production considerations.

  5. Which of the following conditions would require a pressure vessel to be immediately removed from service under API 510?

    Answer: A crack in the pressure boundary that cannot be monitored safely

    An uninspectable or unmonitorable crack in the pressure boundary represents an imminent safety hazard requiring immediate shutdown.

  6. Under API 510, which entity is responsible for maintaining inspection records throughout a pressure vessel's service life?

    Answer: The owner/operator

    API 510 assigns responsibility for maintaining complete and current inspection records to the owner/operator of the pressure vessel.

  7. A 'cold-wall' vessel in hydrogen service where the insulation maintains the shell below 400°F — what Nelson Curve classification governs material selection?

    Answer: The curves apply based on the actual metal temperature (shell temperature)

    For HTHA assessment per API 941, the relevant temperature is the actual metal (shell) temperature, so cold-wall vessels where the shell stays cool have reduced HTHA risk.