KSB Vitacast, Installation & Operating Manual

Page: 68 / 80

8 Trouble-shooting
68 of 80
Vitacast / Vitacast Bloc
A B C D E F G H I J Possible cause Remedy
19)
- - - -
✘
- - - - - Fluid viscosity too high for centrifugal
pump
Check suitability of different pump.
- - - -
✘
- - -
✘
- Flow rate too high Reduce flow rate with discharge-side
control valve. Reduce impeller diameter
or fit orifice plate.
- - - - ✘ - - - - - Speed too high (operation on a
frequency inverter)
Reduce speed.
- - - -
✘
- - -
✘ ✘
Impermissible friction. Impeller touches
inner wall of casing. Repair pump. Re-adjust.
- - - - ✘ ✘ ✘ - ✘ ✘ Pump set not correctly aligned (radial or
angular shaft misalignment), or shaft
run-out Re-align pump and motor or fit new
pump shaft.
- - - - ✘ - - - ✘ - Rolling element bearings of pump and/
or motor worn
Replace bearings.
-
✘ ✘
-
✘
- - - - - Incorrect electrical installation. Adjust electrical connection as required
(only to be performed by trained
specialist personnel).
- ✘ ✘ - ✘ - - - - - Electrical voltage does not match motor
used.
Use motor suitable for electric mains.
- - - - -
✘ ✘ ✘
- - Fluid or fluid temperature unsuitable
for mechanical seal materials used
Select type and material of mechanical
seal as required.
- - - - -
✘ ✘ ✘
- - Pump not cleaned sufficiently after it
was used for fluids that tend to
crystallise
Drain fluid immediately after pump
operation. Perform several cleaning
cycles.
- - - - - ✘ ✘ - - - Mechanical seal installed incorrectly Re-install mechanical seal correctly.
- - - - - ✘ - - - - Incorrect direction of rotation of pump
with non-reversible mechanical seal
Change the direction of rotation.
- - - - -
✘ ✘
- - - Outer mechanical seal flushed
insufficiently (for seal type Q)
Provide sufficient flushing liquid and
liquid pressure.
- - - - -
✘ ✘
- - - Dry running of pump Monitor pump and system (flow meter,
pressure gauge) to prevent dry running.
- - - - - ✘ ✘ - - - Vibrations of pump shaft caused by
misalignment of pump set or worn
rolling element bearings
Re-align pump and motor. Replace
rolling element bearings.
- - - - - -
✘
- - - Fluid contains solids. Select type and material of mechanical
seal as required.
- - - - - - - ✘ - - Excessive fluid temperature or thermal
shock
Observe permissible temperature limits,
increase fluid temperature slowly and
avoid abrupt temperature changes.
- - - - - - - - ✘ ✘ Impeller out of balance Remove any foreign matter from
impeller. Replace or clean impeller as
required.
- - - - - - - - ✘ - Flow rate too low Open discharge-side control valve
further to reduce flow losses in
discharge line.
- - - - - - - -
✘
- Insufficiently secured pump and piping
system
Check anchoring of pump or pump set.
Support and fasten piping sufficiently,
use expansion joints if required.
- - - - - - - - - ✘ Rolling element bearings lubricated
insufficiently. Replace bearings. Provide correct grease
or oil quantity. Observe maintenance
intervals.
- - - - - - - - - ✘ Water enters pump bearings. Clean the bearings. Fill in new
lubricants. Replace joint rings.