Practice Test Geeks(API 510) Certified Pressure Vessel Inspector Practice Test
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Pressure Relief Devices 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. What is the term for the pressure at which a pressure relief valve (PRV) is designed to open, as stamped on its nameplate?

    Answer: Set pressure

    Set pressure is the inlet pressure at which the PRV is set to open, and it is the value stamped on the valve nameplate.

  2. According to ASME Code and API 510, what is the maximum allowable accumulation above MAWP for a single PRV protecting a pressure vessel during a fire exposure case?

    Answer: 21%

    ASME Code allows accumulation up to 21% above MAWP for fire exposure cases when a single pressure relief valve is installed.

  3. In pressure relief valve terminology, what is 'blowdown'?

    Answer: The difference between set pressure and reseating pressure

    Blowdown is the difference between the set pressure and the pressure at which the valve reseats (closes) after opening.

  4. Which API standard specifically covers the sizing, selection, and installation of pressure-relieving devices in petroleum and petrochemical plants?

    Answer: API 520

    API 520 covers the sizing, selection, and installation of pressure-relieving systems and is a key companion document to API 510.

  5. When a rupture disk is installed upstream (inlet side) of a pressure relief valve, what is the primary safety concern with this arrangement?

    Answer: Pressure buildup between the disk and PRV can prevent the PRV from opening correctly

    Gas or pressure accumulation in the space between the rupture disk and PRV creates back pressure that can prevent the PRV from opening at its stamped set pressure, requiring a pressure indicator in that space.

  6. What is the maximum set pressure permitted for a pressure relief valve protecting a pressure vessel with an MAWP of 200 psig in normal (non-fire) service?

    Answer: 200 psig

    The set pressure of a PRV must not exceed the vessel's MAWP; therefore, the maximum set pressure is 200 psig.

  7. According to API 510, who is responsible for establishing the inspection and testing intervals for pressure relief devices?

    Answer: The inspector in conjunction with the owner/user

    API 510 assigns responsibility for establishing PRV inspection intervals to the inspector working in conjunction with the owner/user, based on service history and risk.