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  • Users: Pruk
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  1. Pruk

    Repair a hole on pipe by welding

    Hi All, Actually, this pipe is a part of orifice meter. At first, I've try to order the new spool but seems like roundness of normal pipe is exceed acceptable error. Normally, if I'd like to have a pipe with schedule 120, I'll order pipe with schedule 140 or 160 and then hone it to ensure its...
  2. Pruk

    Repair a hole on pipe by welding

    Hi All, I'm Pruk. Do anyone have ideas about how to repair a hole on pipe? I have a job to fill a 3/8" hole on a 16" Sch 160 pipe with A106 Gr B material. Inside surface of the pipe need to be very flat and obstacle is not allowed. I'm thinking to weld it as per attached picture. If you have...
  3. Pruk

    Control Valve Leakage Calculation

    As JimCasey say that 70.2 doesn't allows us to compare to real process. So, if we like to know leakrate at other pressure, how can we compute then? In this calculation, he tried to compute optimum flare rate. So he have to know normal leakrate from all control valves which connected to flare...
  4. Pruk

    Control Valve Leakage Calculation

    I just read an article about control valve leakage calculation details below. Cv max = 182, Flow rate at 100% open = 50 MMScfd The valve is ANSI class IV specification. So design leakage will be 0.01 % at 50 psi(roughly). Leakage at 50 psi = 0.01/100 * 50 MMScfd = 0.005 MMScfd If inlet...

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