Trouble-Shooting - Speck pumpen Normblock Installation & Operating Manual

A
B
C
D
G
H
Table 19: Trouble-shooting
A B C D E F G H Possible cause
✘
- - - - - - - Pump delivers against an excessively
✘ ✘ ✘ Pump or piping are not completely
- - - - -
✘
- - - - - - - Supply line or impeller clogged
✘
- - - - - - - Formation of air pockets in the piping
✘ ✘ ✘ Suction lift is too high/NPSHavailable
- - - - -
✘
- - - - - - - Air intake at the shaft seal
✘
- - - - - - - Wrong direction of rotation
✘
- - - - - - - Speed is too low.
✘ ✘
- - - - - - Wear of internal components
✘ ✘
- - - - - - Pump back pressure is lower than
✘
- - - - - - - Density or viscosity of fluid handled
✘
- - - - - - - Use of unsuitable shaft seal materials
5) Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
Contact the manufacturer.
6)

8 Trouble-shooting

8 Trouble-shooting
WARNING
Improper work to remedy faults
Risk of injury!
▷ For any work to remedy faults observe the relevant information in this manual
or in the relevant accessory manufacturer's product literature.
If problems occur that are not described in the following table, consultation with the
customer service is required.
Pump delivers insufficient flow rate
Motor is overloaded
Excessive discharge pressure
Increased bearing temperature
E Leakage at the pump
F Excessive leakage at the shaft seal
Vibrations during pump operation
Impermissible temperature increase in the pump
high pressure.
vented or primed.
(positive suction head) is too low.
- Operation with frequency inverter
- Operation without frequency inverter
specified in the purchase order.
higher than stated in purchase order
Normblock
Remedy 5)
Re-adjust to duty point.
Check system for impurities.
Fit a larger impeller. 6)
Increase the speed (turbine, I.C. engine).
Vent and/or prime.
Remove deposits in the pump and/or piping.
Alter piping layout.
Fit vent valve.
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.
Supply external barrier fluid, if necessary, or
increase barrier fluid pressure.
Replace shaft seal.
Check the electrical connection of the motor
and the control system, if any.
- Increase voltage/frequency at the FI in the
permissible range.
- Check voltage.
Replace worn components by new ones.
Re-adjust to duty point.
In the case of persistent overloading, turn
6)
down impeller.
Contact the manufacturer.
Change the material combination.
6)
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