Failure
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Cause
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Solution
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The deep submersible well pump sends out no water or not enough water
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1. You didn’t fill enough water into the pump before it starts. As a result, there is stagnant air left inside.
2. The suction pipe and the packing part leaks air.
3. The pump rotates in a wrong direction.
4. The rotation speed of the pump is too low.
5. Something clogs the bottom valve, the pipeline or the inlet of impellers.
6. The water level at pump inlet drops down.
7. The impeller or the seal ring is badly worn.
8. Spiral occurs on water surface, bringing air into the pump.
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1. Go on to add water into the deep submersible well pump or exhaust the air inside.
2. Block the leaking point, press the packing to make it tight enough.
3. Change the rotation direction of the motor.
4. Accelerate rotation speed.
5. Check the pipeline, remove the sundries.
6. Calculate the suction height, reduce resistance in pipeline, and increase the water level at pump inlet.
7. Change the impeller and the sealing ring.
8. Make the inlet of suction pipe deeper under water.
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The water pump doesn’t run when you start it, or its shaft power is too large when it has been started.
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1. The packing is pressed too tightly. Pump shaft is bent.
2. Clearance between the motor coupling and the pump coupling is so small that the two couplings interfere with each other.
3. Voltage too low.
4. The density of the fluids being transported is extensively larger than the designed fluids density.
5. Flow quantity too large, well beyond the designed range.
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1. Loosen the packing gland a little, straighten the pump shaft.
2. Adjust to enlarge the clearance between motor coupling and pump coupling.
3. Check the electric circuit.
4. Change for a motor of larger power.
5. Close down the sluice valve a little or cut the impeller to reduce its diameter.
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Vibration or noise beyond index
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1. The ground bolt is loose. The deep submersible well pump seat is not completely grouted.
2. The pump shaft and the motor shaft are totally not coaxial or the pump shaft is bent.
3. Pump cavitation
4. Shaft bearing damaged.
5. The seal ring rubs against the impeller.
6. The rotor is totally unbalanced.
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1. Tighten the ground bolt. Grout the pump seat.
2. Adjust to make the pump shaft and the motor shaft coaxial. Straighten the pump shaft or change it.
3. Bring down suction height, reduce the loss of pump head, and decrease fluid temperature.
4. Change the shaft bearing.
5. Dismantle the pump for inspection; change the seal ring or the impeller.
6. Test the rotor for balance again.
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Shaft bearing too hot
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1. No lubricating grease or too much lubricating grease inside the shaft bearing.
2. The shaft bearing is damaged.
3. The pump shaft and the motor shaft are totally not coaxial.
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1. Add lubricating grease or remove the extra lubricating grease.
2. Change the shaft bearing.
3. Adjust to make the pump shaft and the motor shaft coaxial.
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Motor too hot
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1. The flow quantity is too large and the pump is working beyond its rated power.
2. The rotation speed is higher than the rated value.
3. The motor or pump head is mechanically damaged.
4. The motor runs with two phases.
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1. Close down the sluice valve for water outlet properly.
2. Check the electric circuit and the motor.
3. Check the motor and the water pump.
4. Check the power source.
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Mechanical seal leaks water
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1. The mechanical seal is damaged or has become ineffective.
2. The mechanical seal is not installed correctly.
3. The fluids being pumped contain small solid particles.
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1. Change the mechanical seal.
2. Reinstall the mechanical seal.
3. Clarify the fluids to be pumped.
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