Operating Anomalies - BOMBAS IDEAL CPH Série Notice D'utilisation Et D'entretien

Bombas Ideal, S.A.

12.- OPERATING ANOMALIES

ANOMALY
1. The pump does not lift
water.
2. Insufficient flow
3. The power consumption
is higher than expected.
4. The pump drains after
starting.
5. The stuffing box drips
too much.
CAUSE
1.1. Rotating the wrong way.
1.2. Pump not primed.
1.3. Low rotating speed.
1.4. Manometric head higher than
initially considered for the pump.
1.5. Suction head too high.
1.6. Impeller conduit blocked.
1.7. Air getting into suction pipe.
1.8. Insufficient submergence.
2.1. Foot valve partially blocked.
2.2. Insufficient submergence.
2.3. Air getting into suction line.
2.4. Impeller partially jammed.
2.5. Air pockets in suction line.
2.6. Large suction head.
Air getting in stuffing box.
2.8. Rotating direction changed.
2.9. Internal parts worn.
2.10. Leaks on delivery pipes
3.1 Manometric head is lower that
initially considered for the pump.
3.2 Specific gravity and viscosity over
what is expected.
3.3. Stuffing box too tight.
3.4. High speed.
3.5. Excessive consumption.
4.1 Excessive suction head.
4.2. Air taking through the stuffing box. 4.2 Apply 2.7.
4.3. Air taking through
line.
4.4. NPSH < NPSH
r d
SOLUTION
1.1 Change connections of electric
motor. Change position of explosion
engine.
1.2 Foot
gaskets or suction piping. Check
these parts.
1.3 Check the speed with a tachometer,
speed up the engine.
motor. Check the reason for this
low speed (excessive consumption
or low frequency).
1.4 Increase the rotation speed of the
pump or increase the impeller
diameter.
1.5
Take the pump closer to the water
level. Change the pump for another
with less NPSH
the suction piping.
1.6 Unblock the impeller conduits.
1.7 Test pressure the suction pipeline,
including the pump and observe any
liquid leak.
1.8 Extend the suction pipeline increasing
the submergence.
2.1. Clean.
2.2 Submerge the foot valve more. Reduce
the flow.
2.3 Apply 1.7.
2.4 Apply 1.6.
2.5 Change
pipeline. Use air drain keys.
2.6 Apply 1.5.
2.7 Test pressure the suction pipeline,
including the pump and observe any
liquid leak.
2.8 Apply 1.1.
2.9 Change the worn parts.
2.10
Test pressure the pipe and repair
the leaks
3.1
Reduce the diameter of the impeller.
3.2
Reduce the flow with the delivery valve
or change the motor.
3.3
Loosen the stuffing box nuts.
3.4 Reduce speed. Reduce the impeller
diameter
3.5
Check the fastening of the terminals.
Check the mains voltage and make
sure the shaft turns gently by hand.
4.1
Apply 1.5.
the suction 4.3 Apply 1.7.
4.4
Reduce the NPSH
increase the NPSH
enquire at technical service.
5.1
valve leaking. Leaks
Electric
. Reduce leaks in
r
the arrangement of
of the pump,
r
of the system,
d
29
in
the