Malfunctions
What are the main malfunctions and problems with the PLP Sanitary Lobe Pump?
Malfunction |
Cause |
Solution |
|
|
Wrong Direction or Rotation |
Have a qualified electrician reverse the direction of rotation of the electric motor |
|
Pump is not completely filled with liquid |
Fill the pump casing entirely with fluid and fit a non-return valve to the suction side |
|
Insufficient Suction Pressure / NPSHa |
Increase the suction pressure, lower position of the pump further below the fluid level, enlarge suction pipe ø, shorten/simplify suction pipework, reduce operating speed, reduce product temperature |
|
Excessive vapour is present in the suction line |
|
Air is entering the suction line |
Check Connections |
|
Gas in the suction line |
Vent suction pipe/pump casing |
|
Insufficient static head |
Increase the liquid level |
|
Product viscosity is too high |
Lower the operating speed/increase product temperature |
|
Product viscosity is too low |
Increase the operating speed / lower the product temperature |
|
The product temperature is too high |
Cool the product/pump casing |
|
The product temperature is too low |
Heat the product/pump casing |
|
Foreign particles are in the product |
Clean the system / install a suction filter sized according to the passage of the max solid of the pump |
|
The pressure on the delivery side is too high |
Check to pipe for obstructions / simplify the discharge pipework |
|
Pump casing distorted by piping |
Check alignment/support the piping & install flexible couplings |
|
Speed too high |
Lower the speed |
|
Speed too low |
Increase the speed |
|
Insufficient flushing |
Increase flushing capacity/pressure |
|
Worn out bearings/gears |
Replace the worn-out parts |
|
Safety Valve is open |
Check if the delivery valve is open / check the piping for obstructions / check the piping for pressure loss |
For more help and guidance on maintaining your Lobe Pump contact Tapflo UK today by using our live chat system or by email: [email protected]