CTH and CTI Centrifugal Pump Troubleshooting

The Tapflo CT range includes the CTH (Hygienic) and CTI (Industrial) Centrifugal Pumps. Below are our suggestions for maintenance of your CT Centrifugal Pumps.

To ensure your Tapflo Centrifugal Pump is running efficiently and to avoid breakdowns, we recommend regularly checking the following:

  • - The suction and discharge pressure of your pump
  • - Inspect the motor in line with the motor manufacturer’s instructions
  • - The mechanical seal within your pump does not require maintenance, but if leakage occurs, this should be replaced.

The table below shows a range of problems you may be facing with your CTI or CTH Centrifugal Pumps, as well as possible actions to solve them. If the below solutions don’t work, please contact our sales team today for help.

Call Tapflo!

For further maintenance check out the CTI & CTH Centrifugal Pump Manual.

Motor overheating

Insufficient flow rate or pressure in pump

No pressure on the discharge side

Irregular discharge flow / pressure

Noise and vibrations

The pump gets clogged

Overheating of the pump

Abnormal wear

Leak in mechanical seal

Possible reason

Solution

 

X

 

X

 

 

 

 

 

Rotating in the wrong direction

Invert the direction of rotation

 

X

X

X

X

 

 

 

 

Insufficient suction head (NPSH)

Increase Available NPSH:

  • Rise the suction reservoir
  • Lower the pump
  • Increase the pressure in the suction tank
  • Reduce the vapour pressure
  • Increase the diameter of the suction pipe
  • Make suction pipe short and direct

 

 

X

 

 

 

 

 

 

Pump is clogged

Clean the pump

 

X

 

X

X

 

 

X

 

Cavitation

Increase suction pressure

 

X

 

X

X

 

 

X

 

The pump is sucking air

Make sure all connections are tight

 

 

X

X

X

 

 

 

 

Suction pipe is blocked

Check pipes/valves and filters on the suction line

 

X

 

 

X

 

 

 

 

Discharge pressure is too high

Reduce the head by increasing pipe diameter and/or reduce number of valves and bends

X

 

 

 

X

 

X

 

 

Flow rate is too high

Reduce the flow:

  • Partially close the discharge valve
  • Reduce the impeller diameter (contact us)
  • Reduce the rotation speed

 

X

 

 

X

X

X

X

 

Liquid temperature is too high

Cool the liquid

 

 

 

 

 

 

 

 

X

Broken or worn mechanical seal

Replace the seal

 

 

 

 

 

 

 

 

X

Wrong material of O-rings for the liquid

Mount O-rings in other material (contact us)

X

 

 

 

X

X

X

 

 

The impeller scratches

Reduce the temperature and/or suction pressure. Adjust clearance between housing and impeller

 

 

 

 

X

 

 

X

 

Loads on the pipes

Connect the pipes independent of the pump

 

 

 

 

X

X

X

X

 

There are foreign objects in the liquid

Use a filter on the suction side

 

 

 

 

 

 

 

 

X

Spring tension too low on mechanical seal

Adjust as mentioned in this manual

 

 

X

 

 

 

 

 

 

Shut-off valve closed on suction side

Check and open the valve

 

X

 

 

 

 

 

 

 

Discharge pressure too low

Increase the pressure – install an impeller with a bigger diameter (contact us)

 

 

 

 

 

X

X

 

 

Pump is not filled with liquid

Fill pump with liquid

X

X

 

 

X

 

 

 

 

Liquid parameters different than calculated

Check pumped liquid parameters

To Top