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  1. dimockmatt

    Flexible Impeller

    Our chem-e has tested samples and feels that nitrile is compatible with the fluid, viton would be more inert but the mfg tells me it would fail more quickly due to pressure or cavitation. There is always the possibility that they have introduced something harmful since the sample was taken so I...
  2. dimockmatt

    Flexible Impeller

    To answer Mike H, the solids are suspended in solution so a hose would not change the outcome.
  3. dimockmatt

    Flexible Impeller

    Here is a close up of the failed impeller, I do not have a picture of the pump in use.http://files.engineering.com/getfile.aspx?folder=f6438906-9f51-4efe-93ba-5c437ec1481a&file=IMG_0484.jpg
  4. dimockmatt

    Flexible Impeller

    It is a positive displacement pump with a nitrile flexible impeller. We have a shutdown in the program when pressure on the discharge reaches 20psi, the impeller is rated for 25psi. Ideally the water should be filtered before it reaches the feed tank. A filter in the line to our system could...
  5. dimockmatt

    Flexible Impeller

    It is a self priming pump so there is no head requirement, the temp is 75°F. It has a 10ft dry lift and can run dry for up to 30sec, the line is set up to provide flooded suction. I do suspect cavitation, my guess is as the customer's feed tank fills with sediment it chokes the suction side of...
  6. dimockmatt

    Flexible Impeller

    The pump motor is 1.5HP 1750rpm, it is on a VFD and maintains a level in our process vessel, typically the pump runs 1750rpm to fill (15-20 min)then runs at roughly 900rpm(8-20 hours). It is a Jabsco 30520. The customer is processing industrial wastewater normally coolants. There could be...
  7. dimockmatt

    Flexible Impeller

    I have a customer destroying nitrile impellers almost every week. We draw fluid from a roughly 10' diameter tank through a 1" line into the 3/4 port on the pump. The tank is within 20 feet of the pump. Any ideas on the cause and hopefully a solution?

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