Operating instructions B-Series
Version 2.4, En Page 57 of 81 21-10-2005
9.1 Malfunction check-list
Malfunction Cause Possible solution
Pump supplies
no liquid
Pump is not fully filled Fill pump housing with the correct liquid
Gas or air is released from the liquid Ensure the smooth flowing of the liquid
Entrapped air in the suction line Stop air entrapment to the extent possible
Inlet of the suction line is insufficiently
submerged
Further submerge suction line
Foreign object in the rotor Clean rotor
Insufficient lubrication Lubricate
Manometric discharge head calculated too
low
If possible position pump higher
Choose other pump
The suction head is too great or there is
too little difference between the run-off
height and the vapour pressure of the
liquid (too low NPSH)
Position pump lower
Choose other pump
There is a blockage in the suction line Cleaning
There is blockage in the pressure line Clean
There is a leak in the suction line Repair leak
Malfunction Cause Possible solution
Pump supplies
insufficient
capacity
Gas or air is released from the liquid Ensure the smooth flowing of the liquid
Entrapped air in the suction line Stop air entrapment to the extent possible
Inlet of the suction line is insufficiently
submerged
Further submerge suction line
Wrong direction of rotation Change direction of rotation
The wear plate or rotor are worn Replace rotor or parts subject to wear
The rotor is damaged Repair or replace
Manometric discharge head calculated too
low
If possible position pump higher.
Choose other pump.
The suction head is too great or there is
too little difference between the run-off
height and the vapour pressure of the
liquid (too low NPSH)
Position pump lower
Choose other pump
The number of revolutions is too low Increase number of revolutions
There is a blockage in the suction line Clean
The liquid has a higher density than the
viscosity for which the pump is intended
Choose other pump.
There is a leak in the suction line Repair leak
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