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  1. rutherford703

    Is this configuration violate any codes (US & Canada)?

    The attached drawing is a naphtha heater. Naphtha can be blocked in while the steam keeps flowing. A thermal relief valve is provided for such a scenario. The PSV directly discharges to the OWS (Oil Water Sewer). We realized that it is not a good design; however, it is a grandfather plant. Does...
  2. rutherford703

    Pump Cavitation

    Please see attached drawing for detailed information. The naphtha pump is pumping naphtha from the decanter. The decanter colects liquid from the steam stripper overhead condensers. The pump is experiencing serious cavitation problem. The tank bottom is 10 feet higher than the pump eye. The...
  3. rutherford703

    Pressure drop through the pipeline

    This is about a cross country pipeline. We have pressure transmitters at both the entrance of the piping and the end of the piping. The pressure drop is the difference between the two pressure transmitters. With each pressure drop, we can get the corresponding flow rate. All data are listed in...
  4. rutherford703

    Is vacuum breaker required?

    Good morning everyone, Please refer to attached drawing for your information. In the piping arrangement, we have enough pressure to push the water through the piping. The piping discharge will be submerged in the pond water. My question is "Is the vacuum breaker at the highest point necessary...
  5. rutherford703

    Pump Curve

    Dear sir, I need help to explain the pump curve. Please see attached pump curve. From the pump curve, my understanding is that when the discharge valve is closed there is basically no flow through the system and minimum pump torque is required to run the pump. What does the static head mean...
  6. rutherford703

    Water transfer system not properly designed

    Please see attached drawings for information. The system was designed to run 2, 3 or 4 pumps based on pump suction pond level and water user requirement. The system must keep certain pressure at the branch to send water to user 1. The problem with figure 1 is that the section of the piping...
  7. rutherford703

    Booster pump discharge - check valve or isolation valve?

    Please see attached doument for your information. The purpose for the check valve or automatic isolation valve is to prevent reverse flow through the pump during pump trip Check valve: Advantages 1). Immediately stop reverse flow during pump trip Disadvantages 1). check valve not reliable for...
  8. rutherford703

    How will the VFD act?

    I got a pump system like attached drawing. My questions are: 1) Pump D is a booster pump. How do you expect the VFD will response the suction pressure, high pressure to increase the pump speed to pump out more liquid, or low pressure to increase the pump speed to boost the pump discharge...
  9. rutherford703

    AFT Chempak

    I know that AFT is for piping hydraulic calculation. Is the AFT Chempak a different name of AFT or a new program for different purpose?

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