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Pressure Vessel Design & Inspection Codes 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. Under ASME Section VIII Division 1, what is the maximum allowable working pressure (MAWP) based on?

    Answer: The weakest element of the completed vessel

    MAWP is determined by the weakest element of the completed vessel, considering all components including shells, heads, and nozzles.

  2. According to API 510, a corrosion allowance is used primarily to:

    Answer: Provide metal that can be consumed by corrosion between inspections

    Corrosion allowance is extra metal thickness provided to allow for corrosion that will occur during service between inspection intervals.

  3. When calculating the required shell thickness for a cylindrical vessel under internal pressure, which formula from ASME VIII Div. 1 is applied?

    Answer: t = PR / (SE - 0.4P)

    The formula t = PR / (SE - 0.4P) is the ASME VIII Div. 1 formula for longitudinal seam efficiency in cylindrical shells under internal pressure.

  4. What does the joint efficiency 'E' represent in ASME Section VIII pressure vessel design calculations?

    Answer: A factor reflecting the quality and type of radiographic examination performed on the weld

    Joint efficiency E is a factor between 0 and 1 that reflects the radiographic examination category and weld joint type, accounting for potential weld discontinuities.

  5. A hemispherical head on a pressure vessel, compared to an ellipsoidal head, requires:

    Answer: Less thickness because it has the most favorable shape for resisting pressure

    A hemispherical head has the most efficient shape for internal pressure and requires approximately half the thickness of a comparable cylindrical shell.

  6. According to API 510, what action is required when the remaining thickness of a pressure vessel falls below the minimum required thickness?

    Answer: The vessel must be repaired, altered, rerated, or removed from service

    When remaining thickness is less than the minimum required, API 510 requires the vessel to be repaired, altered, rerated, or removed from service.

  7. In ASME VIII Division 1, the term 'design pressure' differs from 'operating pressure' in that design pressure:

    Answer: Is typically set at or above the highest expected operating pressure to account for transients

    Design pressure is set at or above the most severe coincident pressure expected during normal operation, including transients, to ensure the vessel is rated above actual service conditions.