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  • Users: kyu
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  1. kyu

    RVs downstream of high pressure cylinders

    Hi all, I am looking at a relief valve that has been installed downstream of a high pressure cylinder. The cylinder contains a gas at a pressure of roughly 2400 psig. The cylinder is hooked up to a regulator that lets the pressure down to approximately 100 psig. We have a relief valve...
  2. kyu

    Kw backpressure correction factor for liquid PSVs

    Regarding the backpressure correction factor for balanced bellows PSVs in liquid service, Kw: Has anyone seen values for Kw for backpressure/setpressure ratios greater than 80%? I have a situation where I have a ratio greater than 80%, but I have never seen Kw values published for this range.
  3. kyu

    API 3% Inlet Loss for PSVs Protecting Piping

    API RP 520 Part II para. 2.2.2 recommends that the total non-recoverable pressure loss between the protected equipment and the pressure relief valve should not exceed 3 percent. I have a situation where I have a pressure regulator and a high-to-low pipe code break at the regulator. A PSV is...

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