Common faults of pumps, their causes, and solutions

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1. Fault: The pump does not draw water in, and the pressure gauge fluctuates violently. Reason: Insufficient water supply for irrigation. There is air trapped inside the pump. The suction pipe and gauge pipe are leaking air. Solution: Ensure adequate water supply. Inspect the piping to eliminate air leaks. 2. Fault: The vacuum gauge indicates a high vacuum level, yet the pump still does not draw in water. Reason: The bottom valve is not open or is severely clogged. The suction pipe has high resistance. The suction height is too high. Solution: Check the flexibility of the bottom valve flap and remove any blockages. Keep the suction pipeline as simple as possible. Reduce the water absorption height. 3. Fault: The outlet pressure gauge shows pressure, but the pump outputs very little water or no water at all. Reason: High resistance in the outlet pipe. The direction is wrong. Impeller clogging. The rotation speed is not sufficient. Solution: Reduce the pipe resistance. Check the motor direction. Remove impurities from the impeller. Increase the speed. 4. Fault: Flow rate is below the designed value. Reason: Impacted impeller. The clearance wear of the sealing ring is too large. The rotation speed is not sufficient. Solution: Remove the blockage. Replace the sealing ring. Increase the speed to the value specified on the nameplate. 5. Fault: Excessive power consumption by the pump. Reason: The packing is compressed too tightly, causing the packing chamber to overheat. Impeller wear. The pump is delivering too much water. Solution: Loosen the filler gland. Replace the impeller. Close the gate valve to reduce the flow rate. 6. Fault: Abnormal noise inside the pump, and no water is pumped out. Reason: Excessive resistance in the suction pipe. The water absorption height is too high. Air has entered the suction pipe. The temperature of the liquid being pumped is too high. Solution: Check if the suction pipe is blocked. Clean the bottom valve, lower the liquid temperature, or reduce the suction height. 7. Fault: Vibration of the water pump. Cause: The pump shaft is not aligned with the motor shaft. The impeller is unbalanced. The bearing clearance is too large. Solution: Adjust the pump and motor to align their axes. The impeller has passed the balance test, with the required unbalance weight being around 3 grams. Replace the bearing. 8. Fault: Bearing overheating. Cause: Lack of oil in the bearing or excessive oil viscosity, which hinders lubrication. The bearing wear gap is too large. The pump and motor are not aligned. Solution: Keep going. Replace it with oil or an oil of lower viscosity. Replace the bearing. Adjust the pump and motor to ensure they are concentric. 9. Fault: High noise. Cause: The pump and motor are not installed concentrically. Wear of the pump or motor bearings causes vibration. Solution: Adjust the pump and motor to ensure they are concentric. Replace with a new bearing.