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Recent content by mec5216

  1. mec5216

    Flow leakage across wear rings

    Hello Does anyone know an equation to calculate the flow leakage through clearances between wear rings?? Thank you
  2. mec5216

    Thermoshyphoning in sealing

    ok, I agree with you. But I meant something different. Let's suppose there are two tubes lengthening 2ft. The first tube is filled up with a fluid in a known temperature. The second tube is also filled up with the same fluid, but in a lower temperatur (let's suppose 47ºF lower compared to the...
  3. mec5216

    Thermoshyphoning in sealing

    But the difference in density of the fluid changes very little along with the change in temperature. And even if we consider this difference in density and a weight of column of 2 feet, the system would get very little head from thermoshyphoning. Two 90-degree bend may be enough to overcome this...
  4. mec5216

    Thermoshyphoning in sealing

    hello According to API 682 (shaft sealing systems for centrifugal pumps), the API plan 23 requires the heat exchanger to be placed some high above the mechanical seal in order to provide thermoshyphoning, what would help the pump ring to delivery head to make the sealing system work. Although...
  5. mec5216

    BEP Purely Geometric?

    What BigInch said is completely right. I just would like to emphasize that the first topic he mentioned is the one which contributes the most to the best efficiency of a pump. Depending on the outlet triangle velocity and the diffuser geometry, the BEP can be estimated, but only confirmed after...
  6. mec5216

    heat exchanger leakage

    hello I'm facing a situation at work with heat exchanger in a pump sealing plan. It's a coil heat exchanger, wich runs with fluid to be cooled at 260ºC (500°F) in the coil and water at 25ºC (77ºF) at the shell. But it doesn't even last 3 weeks running properly. There's always a hole that...
  7. mec5216

    Tank filling-bottom or top-rotary pump

    micalbrch's absolutely right. Theoretically, if you choose to fill the tank by the its bottom, it will consume less power than if it was filled by the top. As we know, the operation point is at the intersection of the pump curve with the system curve. Varying the level of the tank might or...
  8. mec5216

    Venting

    In a plan 11, it's recommended that you plug your tubing from discharge at the highest point of your seal's cartridge, so you can vent your pump at the start up.
  9. mec5216

    exit angle of an impeller

    DubMac, how do you measure the exit angle using a protractor ?
  10. mec5216

    exit angle of an impeller

    By trimming an impeller, its exit angle is changed a bit. I was wondering if this changing in the exit angle could be so great that the new head due to the impeller trimming would not follow the affinity laws anylonger.
  11. mec5216

    exit angle of an impeller

    If so, how can I do that?
  12. mec5216

    exit angle of an impeller

    Hello Is there any way I could measure the exit angle of an impeller?? Thank you!
  13. mec5216

    liquid ring pump locked up!

    bearing house showing wear patternhttp://files.engineering.com/getfile.aspx?folder=e197c651-9176-4cb0-bc8f-f341efbc1f1c&file=DSC04252.JPG
  14. mec5216

    liquid ring pump locked up!

    photo of the rotor attached to the conehttp://files.engineering.com/getfile.aspx?folder=40a3c2b6-79ee-430c-a6a9-5e8ff99eae42&file=DSC04239.JPG
  15. mec5216

    liquid ring pump locked up!

    photohttp://files.engineering.com/getfile.aspx?folder=25fcde7f-5d4a-4f7f-9716-4afa077d1a77&file=DSC04232.JPG
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