KSB WKTR - Page 65

Fault Possible cause Remedial action
Pump is warped. Check piping connections and secure
pump fastening.
Cooling liquid quantity too low Increase cooling liquid quantity.
Contaminated cooling liquid chamber
or cooler
Clean the cooling liquid chamber or
cooler.
Check the cooling liquid and, if required,
clean it.
Malfunction of the circulation line Increase the usable cross-section.
Check the piping.
Excessive surface pressure at the
sealing clearance, insufficient lubricant
or circulation liquid
Check the installation dimensions.
Contact KSB Service.
Excessive bearing temperature Defective bearing Check and, if required, replace it.
Oil quantity Check the oil quantity. If required, top it
up or replace it.
Oil quality Check.
Increased axial thrust Check casing wear rings/balancing device
and, if required, replace them.
Contact KSB Service.
Wear of internal pump parts Replace defective parts.
Contact KSB Service.
Rotor out of balance Clean the rotor.
Balance the rotor.
The pump set has not been aligned
properly.
Check the alignment; re-align, if required.
Pump is warped. Check pipeline connections and secure
pump fastening.
Distance of coupling hubs Verify the distance of the coupling hubs
against the general arrangement drawing;
re-adjust it, if required.
Pump temperature > specified
value
Pump or piping are not completely
vented or primed.
Entlüften bzw. auffüllen.
NPSH
available
(positive suction head) is
too low.
Adjust the fluid level in the inlet tank.
Completely open the valve in the inlet
pipe.
Change suction line if the friction losses in
the suction line are too high.
Check any strainers installed.
Excessive speed of pressure fall Observe permissible speed of pressure fall.
Flow rate < specified value Increase flow rate Q
min
.
Pump leakage Defective O-rings and/or metallic
sealing surfaces
Replace the O-rings and/or remachine the
metallic sealing surfaces.
Contact KSB Service.
Vibrations during pump
operation
Pump or piping are not completely
vented or primed.
Vent and/or prime.
NPSH
available
(positive suction head) is
too low.
Adjust the fluid level in the inlet tank.
Completely open the valve in the inlet
pipe.
Change suction line if the friction losses in
the suction line are too high.
Check any strainers installed.
Excessive speed of pressure fall Observe permissible speed of pressure fall.
Wear of internal pump parts Replace defective parts.
Contact KSB Service.
8 Trouble-shooting
WKTR
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