Solving the 10 Most Common Problems with Self Priming Pumps (Part 2 of 2)



In this article we’re going to tackle four of the biggest issues that people have with self priming pumps.

  • No flow,
  • Low flow/pressure,
  • Noise and Vibration,
  • Increased/ high maintenance
  • Table of Content

    Check impeller ware

    For assets that have been installed for a long period, or have been subject to harsh liquids, it’s quite likely that your pump would have experienced some forms of wear. A clear indication of wear is when you have a reduction in pumping performance. Too much wear or an uneven wear, will start to cause other issues such as noise and vibration. The only solution for wear is replacement, but wear is usually quite obvious when doing a visual inspection either via an inspection cover or when removing the pump casing and reviewing the parts itself.

    Self Priming Pump Worn Impeller

    Pump rotation – (Clockwise or Anti-Clockwise)

    When installing pumps ,it might be that the wiring was installed the wrong way around which would mean that your pumps are fundamentally rotating in the wrong direction. You would still get flow going forward but there will be a reduction in flow as well as a reduction in pressure, and you may also experience solid handling capabilities is also reduced. The safest and most easiest method of checking the rotation of the pump is to use a magnetic field ring, But there’s other methods such as checking the impeller rotation through the inspection cover on a pump stop, or opening up the junction box and check the wiring configuration.

    Short Bearing life

    Typically pumps are already supplied with a bearings grease which means that you don’t need to apply greasing for approximately the first 500 hours of operation however, the four main causes for short bearing life are:

    Short Mechanical seal life (Leakages)

    If you spot a leakage around your volute casing or around your bearing housing then it’s quite likely that you’ve got a mechanical sill failure different mechanical seals are designed for different liquid temperatures abrasion or viscosity now typically mechanical seals last about 500 hours of operation however for your specific pump you still need to refer to the O&M manual.

    Can your pump produce enough pressure

    Low pressure means low flow, and if your pump can’t produce enough pressure the simple answer is get a bigger pump. However, that should be a last resort! First you must troubleshooting and check that the system is what was expected.
    Now a bigger pump does not always mean a new pump. In many cases it might be as simple as an impeller swap or an impeller & motor swap. But this might be the right solution for you once all else fails.

    In this article we’ve covered some of the biggest issues that people have with self priming pumps, however for your specific pump model please refer to the O&M manual which can be found at Find your pump, and click the  downloads tab.

    For more information on self priming pumps. BEPumps has a great article titled A Simple Guide To Self-Priming Pumps or visit BEPumps Youtube.

    It come with great pleasure to have the Varisco Pump J Range, Calpeda A Range and Various Ebara Self Priming Pumps as part of the BEPumps Family. Our engineers have a wealth of experience in working with these pumps, fault finding, system optimization, installing and Repairing. Look no further for Self Priming Pumps!