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FCI 70-2 pressure testing standard query

Hi

I understand that Fisher uses FCI 70-2 standard for control valve leakage test. Can someone kindly explain that why for Class VI valves the FCI asks for test pressure of only 50 psig? Is there any impact on valve if this test pressure is increased?

Regards

1 Reply

  • Shaiq
     
    ANSI/FCI 70-2-2021 chapter 5 determines the testing procedures of the various leakage classes. According to item 5.4 - Type C test procedure - the test pressure for class VI is 50 psi or the maximum differential pressure, whichever is lower. Considering that the purpose of the test is to verify the quality of the manufacturing there is no point in testing the control valve with a higher pressure. Remember that the leak test by the control valve seat is not intended to check the leakage of the control valve when in operation. See item 2.2. If there is a need for zero leakage use block valve and API 598 for testing.
    Best regards
     
    David L V Rodrigues
    De: Shaiq Bashir [mailto:bounce-Shaiq_Bashir@emersonexchange365.com]
    Enviada em: segunda-feira, 13 de março de 2023 17:41
    Para: Valves@emersonexchange365.com
    Assunto: [EE365 Valves Group] FCI 70-2 pressure testing standard query
     
     

    Hi I understand that Fisher uses FCI 70-2 standard for control valve leakage test. Can someone kindly explain that why for Class VI valves the FCI asks for test pressure of only 50 psig? Is there any impact on valve if this test pressure is increased

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