8 Trouble-shooting
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KWP-Bloc
8 Trouble-shooting
WARNING
Improper work to remedy faults
Risk of injury!
▷
For any work performed to remedy faults, observe the relevant information
given in this operating manual and/or in the product literature provided by the
accessories manufacturer.
If problems occur that are not described in the following table, consultation with the
KSB customer service is required.
A
Pump delivers insufficient flow rate
B
Motor is overloaded
C
Excessive discharge pressure
D
Increased bearing temperature
E
Leakage at the pump
F
Excessive leakage at the shaft seal
G
Vibrations during pump operation
H
Impermissible temperature increase in the pump
Table 21:
Trouble-shooting
A B C D E
F G H Possible cause
Remedy
17)
✘
-
-
-
-
-
-
- Pump delivers against an excessively
high pressure.
Re-adjust to duty point.
✘
-
-
-
-
-
-
- Excessively high back pressure
Check system for impurities.
Fit a larger impeller.
18)
Increase the speed.
✘
-
-
-
-
-
✘ ✘
Pump or piping are not completely
vented or primed.
Vent and/or prime.
✘
-
-
-
-
-
-
- Supply line or impeller clogged
Remove deposits in the pump and/or piping.
✘
-
-
-
-
-
-
- Formation of air pockets in the piping
Alter piping layout.
Fit vent valve.
-
-
-
✘
-
✘ ✘
- Pump is warped or sympathetic
vibrations in the piping.
Check the piping connections and secure
fixing of pump; if required, reduce distances
between the pipe clamps.
Fix the pipelines using anti-vibration material.
✘
-
-
-
-
-
✘ ✘
Suction lift is too high/
NPSH
available
(positive suction head) is too
low.
Check/alter fluid level.
Fully open the shut-off element in the supply
line.
Change suction line, if the friction losses in
the suction line are too high.
Check any strainers installed/suction opening.
Observe permissible speed of pressure fall.
-
-
-
✘
-
-
-
- Increased axial thrust
18)
Correct the rotor adjustment.
✘
-
-
-
-
-
-
- Air intake at the shaft seal
Fit new shaft seal.
✘
-
-
-
-
-
-
- Wrong direction of rotation
Interchange two of the phases of the power
cable.
✘ ✘
-
-
-
-
-
- Motor is running on two phases only.
Replace the defective fuse.
Check the electric cable connections.
17)
Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
18)
Contact the manufacturer.