IMP Pumps CV 32, PV 32 - Handbuch (Seite 18)

-18-
GB
Insufficient flow of pump Overloading the electric motor Excessive outflow pressure Excessive temperature of bearings Excessive temperature of pump Insufficient level of medium Release of medium on the shaft seal Uneasy run of pump
CAUSE MEASURES
X
Pump operation under excessive
pressure (open system)
Setting of operational point (Q, H)
X Excessive back pressure Increasing the number of rotations
X X X
Air is not bled out of pump,
insufficiently filled with medium
Bleed out the air and fill up the
system with medium
X Blocked inflow into pipes Remove deposits
X X X
Occurrence of air cushion in the
piping system
Change pipes, install valve for
bleeding air
X X X
The pump is creating resonant
effects and whirling in the piping
system
Checks connections to the piping
system and the fastening of the
pump; fasten the clamps on the
piping; install compensators into
the piping system
X
Insufficient NPSH of the pump,
excessive suction height
Check the state of the medium;
open the lock in the inflow pipe;
change the inflow lead in case
of strong resistance; check the
suction opening
X No centreline on shaft
Coordinate the settings of the
vanes
X Wrong direction of pump rotation Change mechanical seal
X X Operation on two phases
Change 2 phases on the incoming
electrical connection
X Damage to bearings
Change the fuse; check the
incoming connections
X X X Insufficient flow of medium Change the bearings
X X Wear of internal parts Increase flow of medium
X X
Back pressure of the pump is
lower than expected
Change internal parts
X
Viscosity and thickness of medium
higher than recommended
Setting of operational point (Q, H)
X Use of poor quality materials
Wechseln mit qualitätsvollen
Materialien
X
Fault on the sealing and fixing
screws
Consult with professional
personnel from the pump
manufacturer
X Seals on shaft are leaking
Change with high quality materials
Change seals, tighten screws
X X
Damages on shaft and seat of
seal
Change the seal
Change the shaft and seals