Bombas Ideal, S.A.
13.
OPERATING ANOMALIES
ANOMALY
1. The pump does not lift
water.
2. Insufficient flow
3. The power consumption is
higher than expected.
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.
2.7. 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.
SOLUTION
1.1. Change connections of electric
motor. Change position of explosion
engine.
1.2. Foot valve leaking. Leaks in gaskets
or suction piping. Check these parts.
1.3. Check the speed with a tachometer,
speed up the engine. Electric 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 NPSHr. Reduce leaks in 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 the arrangement of the
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.
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