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Pressure Relief Devices Flashcards

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  1. What is the maximum PRV inspection interval permitted by API 510 for a pressure relief valve in clean, non-corrosive, non-fouling service with documented good performance history?

    Answer: 10 years

    API 510 allows inspection intervals up to 10 years for PRVs in proven non-corrosive, non-fouling services where performance history justifies the extension.

  2. During bench testing of a pressure relief valve, the valve opens at 108% of its stamped set pressure. What is the most likely cause?

    Answer: Seat fouling, corrosion, or deposits are preventing normal opening

    Opening above set pressure typically indicates seat fouling, corrosion, or scale buildup that is mechanically preventing the valve disk from lifting at the correct pressure.

  3. Which type of pressure relief device provides zero leakage before activation and is non-reclosing after operation?

    Answer: Rupture disk

    A rupture disk is a solid membrane that provides zero leakage before burst and is non-reclosing, meaning it must be replaced after every activation.

  4. A pressure indicator or 'tell-tale' gauge is required between a rupture disk and a downstream PRV. What is its primary function?

    Answer: To detect premature rupture disk failure or leakage and alert operators

    The tell-tale detects premature disk failure or leakage so operators can replace the disk before vessel pressure reaches the PRV set pressure, maintaining the dual-protection integrity.

  5. A pressure vessel with an MAWP of 150 psig is protected by a single PRV set at 150 psig. During a fire exposure scenario, what is the maximum allowable vessel pressure?

    Answer: 181.5 psig

    For fire exposure with a single PRV, ASME Code allows 21% accumulation above MAWP: 150 × 1.21 = 181.5 psig maximum allowable pressure.

  6. Which of the following is NOT an acceptable method for testing and inspecting a pressure relief valve according to API 576?

    Answer: Calculation-only verification without any physical actuation of the valve

    Calculation-only verification without physical testing is never acceptable; PRVs must be physically actuated and tested by an approved method to confirm set pressure and operability.

  7. What distinguishes a 'relief valve' from a 'safety valve' in pressure relief device terminology?

    Answer: A relief valve opens gradually in proportion to overpressure; a safety valve opens with a rapid full-lift pop action

    A relief valve opens gradually proportional to pressure increase above set and is typically used for liquid service, while a safety valve opens rapidly (pops) to full lift and is used for compressible fluids.