8 Trouble-shooting
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Sewatec
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
Table27: Trouble-shooting
A B C D E F G H Possible cause Remedy
9)
✘ - - - - - - - Pump delivers against an excessively
high pressure.
Re-adjust to duty point.
Check system for impurities.
Increase speed.
✘ - - - - - ✘ ✘ Pump and/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 head 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 Contact KSB.
✘ - - - - - - - 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 2 phases only. Replace the defective fuse.
Check the electric cable connections.
✘ - - - - - - - Speed is too low. Increase speed, request particulars.
- - - - - - ✘ - Defective bearing(s) Replace bearing(s).
- - - ✘ - - ✘ ✘ Insufficient flow rate Increase the minimum flow rate.
✘ - - - - - ✘ - Wear of internal components Replace worn components by new ones.
- ✘ - - - - ✘ - Pump back pressure is lower than
specified in the purchase order.
Re-adjust to duty point.
9) Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
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