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Recent content by rutherford703

  1. rutherford703

    Management Change

    Piping class is normally determined based on the service conditions - pressure, temperature and commodity inside the pipeline. For the three phase separator, you have phase change - from liquid phase to vapor phase. Normally, chemical engineer decides the service conditions. Material engineer...
  2. rutherford703

    cooling medium expansion vessel

    It all depends on your service conditions (pressure, temperature) and medium. Is the vessel full of liquid? Is the liquid flammable? Vapor pressure? Boiling point? Poisonous? "vessel being designed for atmospheric pressure" is not clear what the vessel design pressure is, 0 psig or 14.7 psig...
  3. rutherford703

    Two Pumps with Auto start/Stop switch through selection

    This is more electrical than chemical process. Let me try to explain the function of the process. In the drawing something showed as interlock is not an interlock, actually it is a controller. The controller input is from flow transmitter (normally called PV) with a signal of 0-24V and the...
  4. rutherford703

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

    Thanks for all your valuable information!
  5. rutherford703

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

    sorry the attachment does work Thankshttp://files.engineering.com/getfile.aspx?folder=4725df91-d3b7-416e-87aa-a8c20124d9c3&file=Naphtha_heater.pdf
  6. 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...
  7. rutherford703

    Pump Cavitation

    Good point Artisi. You deserve a star. Yes. There is some entrained solid in the naphtha. Even the recirculation control valve has some erosion issue. Thanks.
  8. rutherford703

    Pump Cavitation

    Thanks everyone for the valuable opinions. As Artisi required, I attached the pump performance curve. The rated point is far away from the BEP. The pump casing eroded as in the photo only lasted for three weeks running. Thanks...
  9. rutherford703

    Pump Cavitation

    Seal(?) damagehttp://files.engineering.com/getfile.aspx?folder=1c792dc0-888e-4f7c-b62a-26d213f7edd8&file=seal_damage.jpg
  10. rutherford703

    Pump Cavitation

    Here is the photo for impeller damagehttp://files.engineering.com/getfile.aspx?folder=8ea7a309-140c-471c-8ab8-12d063c3a22e&file=impeller_damage.jpg
  11. rutherford703

    Pump Cavitation

    I didn't realize that the forum does not allow to attach multiple documents which I thought to be posted. Some new photos here. Sorryhttp://files.engineering.com/getfile.aspx?folder=4ad50482-8bd4-4ed5-911d-35088eadf4db&file=Casing_damage.jpg
  12. rutherford703

    Pump Cavitation

    Actually, I rechecked the operating manual, the minimum clearance between the casing wear ring and impeller wear ring was followed API standard and is about 0.010". I haven't seen the wear rings after they were taken out and I am not clear how damage the wear rings are. I see the problem may be...
  13. rutherford703

    Pump Cavitation

    Hi 1gibson, Even if I unwilling to admit you are right, the erosion mode predicts what you said. As a process engineer, I cannot believe that the apparant error cannot be found by our pump specialist and causing the pump failure again and again. It is the very likely the root cause. I give you...
  14. rutherford703

    Pump Cavitation

    Thanks all of you for your valuable opinions. I have to agree that the damage of the pump is due to erosion. While I cannot answer all your questions, I attach the mechanical drawing for the pump and show where the damages are. It seems to me that the extensive erosion on the casing is a little...
  15. rutherford703

    Pump Cavitation

    Here are some photoshttp://files.engineering.com/getfile.aspx?folder=5e94b4cb-cfed-4515-8411-46bc04c24227&file=inlet_surface.jpg
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