Operating instructions B-Series
Version 2.4, En Page 58 of 81 21-10-2005
Malfunction Cause Possible solution
Choose a
different pump
Pump and suction line are 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
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 Clean
There is a leak in the suction line Repair leak
Malfunction Cause Possible solution
Pump requires a
different
capacity
Wrong direction of rotation Change direction of rotation
Foreign object in the rotor Clean rotor
The shafts are not precisely in line Align unit
The shaft is buckled Replace shaft
Turning parts run against stationary parts Adjust and align as necessary
The wear plates or rotor are worn Replace rotor or parts subject to wear
The rotor is damaged Repair or replace
The packing is not properly fitted Assemble properly and replace any
damaged packing.
Ineffective lubrication or insufficient
lubricant in the bearing housings, possibly
as a result of a leak; noticeable at
increased temperature
Follow service plan
The pump does not work at the correct
operating point
Adjust piping system if possible.
Choose other pump
The liquid has a higher density than the
viscosity for which the pump is intended
Adapt temperature of liquid if possible.
Choose other pump
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