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  1. RotEquipEngr

    NPSHa under vacuum conditions

    The pump will not know or care if it pumping under a vacuum. You will have to figure your NPSA in abs. pressure. Even if your NPSH comes out to a negative number, the partial pressure of the tank under vacuum will compete with the static pressure of the liquid, but it will not take it away...
  2. RotEquipEngr

    Need Help on Seawater Seals for a shaft

    I would recommend either Chesterton or Flowserve seals. Chesterton had a pump and seal line that was designed exclsuively per U.S Navy specs. to be used aboard naval vessels, so they will have a lot of know how and expertise dealing with sea water applications. I believe that one of their...
  3. RotEquipEngr

    Total end play on electric motors driving pumps

    JJPellin: 10 times the internal radial clearance works for me. After using this on a couple of bearings I know we have running in our electric motors, I am comfortable with the range of axial movement this yields. I would like to know if this is a figure you developed there where you work, or...
  4. RotEquipEngr

    Total end play on electric motors driving pumps

    Total pump axial movement should not exceed 0.004 when using two angular contact thrust bearings. This figure is baed on the pump operating at 100 degrees F or less. If we are using a double row bearing for a thrust bearing, we may allow .001 to .007, depending on what the manufacturer...
  5. RotEquipEngr

    Total end play on electric motors driving pumps

    I would like some input from others involved with rotating equipment in either a refinery or power generation plant. What would some of you consider excessive end play in an electric motor that is driving a centrifugal pump? We have had several pumps which had gotten into a pattern of...
  6. RotEquipEngr

    Centrifugal Pumps on Vacuum Tower

    Thank you all for the valuable input! This has been a big help providing me with a way to improve my communication with guys out in the field.
  7. RotEquipEngr

    Centrifugal Pumps on Vacuum Tower

    I am looking more for some helpful tips on explanation. I am working on building a training module for operators in refineries and chemical plants. I am putting together some information on centrifugal pumps and how they operate under certain conditions. I am currently working on a section about...

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