CPC-ZA Sanitary Trouble-Shooting

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?

In general the following malfunctions can be identified:

  • - Pump provides little or no flow
  • - Pump does not reach duty point
  • - Pump provides irregular flow
  • - Pump leaks
  • - Pump vibrates excessively
  • - Pump makes too much noise
  • - Motor overheats
  • - Motor / Pump cuts out on thermal overload
  • - Pump has seized

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

MalfunctionCauseSolution
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XXXElectrical Connection is defectiveHave a qualified electrician check the connections
XWrong Direction or RotationHave a qualified electrician revers the direction of rotation of the electric motor
XPump is not completely filled with liquidFill the pump casing entirely with fluid and fit a non-return valve to the suction side
XXXXInsufficient Suction PressureIncrease the suction pressure or lower position of the pump further below the fluid level
XXPump 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
XXXAir in the pipeworkInspect the pipework and avoid upward rising bends in the pipework
XValve in the suction pipework is not completely openEntirely open the valve
XPump has been selected with too low a delivery pressureInstall a larger pump or install a booster pump
XXXXSuction pipe or filter is blockedClean the suction pipe or filter
XShaft Seal is defectiveReplace the Seal
XO-Ring is defectiveReplace the O-Ring
XLiquid Temperature is too highDecrease the liquid temperature
XXXImpeller is jammedUnclog the impeller and replace if necessary
XXXXImpeller 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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