8 Trouble-shooting
63 of 74
HPK-L
1136.8/15-EN
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 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 23:
Trouble-shooting
A B C D E
F G H Possible cause
Remedy
12)
✘
-
-
-
-
-
-
- Pump delivers against an excessively
high pressure.
Re-adjust to duty point.
Check system for impurities.
Fit a larger impeller.
13)
Increase the speed (turbine, I.C. engine).
✘
-
-
-
-
-
✘ ✘
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.
✘
-
-
-
-
-
✘ ✘
Suction lift is too high/
NPSH
available
(positive suction head) is too
low.
Check/alter fluid level.
Install pump at a lower level.
Fully open the shut-off element in the suction
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.
✘
-
-
-
-
-
-
- Air intake at the shaft seal
Clean barrier fluid duct, supply external barrier
fluid, if necessary, or increase barrier fluid
pressure.
Replace shaft seal.
✘
-
-
-
-
-
-
- Wrong direction of rotation
Check the electrical connection of the motor
and the control system, if any.
✘
-
-
-
-
-
-
- Speed is too low.
13)
- Operation with frequency inverter
- Operation without frequency inverter
- Increase voltage/frequency at the frequency
inverter in the permissible range.
- Check voltage.
✘
-
-
-
-
-
✘
- Impeller
Replace worn components by new ones.
12
Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
13
Contact KSB.
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