Operating Anomalies - BOMBAS IDEAL GNI Series Owner's Manual

Bombas Ideal, S.A.

11.- OPERATING ANOMALIES

ANOMALY
1. The pump does not lift
water.
4. Insufficient flow
5. The power consumption
is higher than expected.
6. The pump drains after
starting.
7. The pump vibrates.
8. The bearings get too hot.
CAUSE
1.1. Rotating the wrong way.
1.2. Pump not primed.
1.3. Low rotating speed.
1.4. Suction head too high.
1.5. Air getting into suction pipe.
1.6. Insufficient submergence.
2.1. Foot valve partially blocked.
2.2. Insufficient submergence.
2.3. Air pockets in suction line.
2.4. Rotating direction changed.
2.5. Internal parts worn.
3.1 Specific gravity and viscosity
over what is expected.
3.2. Excessive consumption.
4.1 Excessive suction head.
4.2. Air taking through
line.
4.3. NPSH < NPSH
r d
5.1. Impeller imbalanced
breakage or partial obstruction.
5.2. Air in the liquid.
5.3. Cavitation.
6.1. The pipelines produce tensions in
the pump.
SOLUTION
Change connections of electric motor..
Foot valve leaking. Leaks in gaskets or
suction piping. Check these parts.
Check the reason for this low speed
(excessive consumption or low frequency).
Take the pump closer to the water level.
Change the pump for another with less
NPSH . Reduce leaks in the suction piping.
r
Test pressure the suction pipeline, including
the pump and observe any liquid leak.
Extend the suction pipeline increasing the
submergence.
Clean.
Submerge the foot valve more. Reduce the
flow.
Change the arrangement of the pipeline.
Use air drain keys.
Change connections of electric motor
Change the worn parts.
Reduce the flow with the delivery valve or
change the motor.
Check the fastening of the terminals.
Check the mains voltage and make sure the
shaft turns gently by hand.
Take the pump closer to the water level.
Change the pump for another with less
NPSH . Reduce leaks in the suction piping
r
the suction Test pressure the suction pipeline, including
the pump and observe any liquid leak
Reduce the NPSH
the NPSH
d
technical service.
through Change the impeller, clean the impeller.
Bleed the air from the liquid or prevent it
from getting into the pump.
Change the operating conditions of the
pump in the installation. Enquire at our
technical service.
Eliminate the tensions by loosening the
pipeline.
of the pump, increase
r
of the system, enquire at
12