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CPC-ZA Sanitary Self-Priming Centrifugal Pump Troubleshooting

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    Possible Malfunctions

    What are the main reasons of malfunction of a CPC-ZA Sanitary Self-Priming Centrifugal Pump?

    A malfunction in a pump system may be caused by various reasons and is not necessarily the pump itself. Issues with the pipework or other fluid accessories within the system can be contributing factors. Furthermore, if the operating conditions differ too greatly from the provided specification for which the pump was selected for can also be a major contributing factor.

    Consequently, it is always recommended to check the following first:

    • Has the pump been installed correctly?
    • Are the operating conditions still according to the initial specification?
    • Are the other fluid accessories within the pipework functioning correctly?

    Malfunction Causes and Solutions

    In general, the following malfunctions can be identified:

    1. Pump provides little or no flow
    2. Pump does not reach duty point
    3. Pump provides irregular flow
    4. Pump leaks
    5. Pump vibrates excessively
    6. Pump makes too much noise
    7. Motor overheats
    8. Motor / Pump cuts out on thermal overload
    9. Pump has seized

    Below is a table of the possible causes and solutions of these malfunctions.


     X   XX  Electrical Connection is defectiveHave a qualified electrician check the connections
     X       Wrong Direction or RotationHave a qualified electrician revers the direction of rotation of the electric motor
    X        Pump is not completely filled with liquidFill the pump casing entirely with fluid and fit a non-return valve to the suction side
    XXX  X   Insufficient Suction PressureIncrease the suction pressure or lower position of the pump further below the fluid level
     X     X Pump operating at the wrong speedCheck the motor speed
            XContamination or objects are lodged within the pump which are larger than the solids handling capacityClean the pump and install a suction filter if necessary
    XXX      Air in the pipeworkInspect the pipework and avoid upward rising bends in the pipework
     X       Valve in the suction pipework is not completely openEntirely open the valve
     X       Pump has been selected with too low a delivery pressureInstall a larger pump or install a booster pump
    XXX     XSuction pipe or filter is blockedClean the suction pipe or filter
       X     Shaft Seal is defectiveReplace the Seal
       X     O-Ring is defectiveReplace the O-Ring
           X Liquid Temperature is too highDecrease the liquid temperature
    X      XXImpeller is jammedUnclog the impeller and replace if necessary
        XX XXImpeller is damagedReplace the impeller
        XXXXXMotor Shaft is bentReplace the motor
        XXXXXExtension shaft is looseInspect the extension shaft, reassemble and readjust
        XXXXXBearings are damaged or wornReplace the motor, for IG(H) replace the bearings.
           XXMotor is overloadedCheck the viscosity of the fluid.

    Switch off the motor and check if the pump does not drag, if so, disassemble and repair.

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