Causes of problems in slurry pump units and solutions

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A slurry pump unit refers to the entire set consisting of the slurry pump, motor, pipelines, and other related components. When there are problems with a slurry pump, it’s certainly not possible to focus solely on one particular component; an overall examination is necessary. Below are some of the common issues that occur in slurry pump systems along with corresponding solutions, in the hope that they will be helpful to everyone: ZJ type horizontal slurry pump 1. The slurry pump fails to draw in water, and the pressure gauge shows severe fluctuations. Reason: If it is grouting, there may not be enough water for injection; there is air in the pump chamber of the slurry pump, and there are leaks in the inlet piping and gauge tubes. Solution: Fill the water supply adequately, inspect the pipelines, and eliminate air leaks. 2. 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, resulting in high resistance in the suction pipe and an excessive suction height. Solution: Check the flexibility of the bottom valve flap, remove any blockages, keep the suction pipeline as simple as possible, and reduce the suction height. 3. The outlet pressure gauge indicates pressure, but the pump outputs very little water or no water at all. Reason: High resistance in the outlet pipe, incorrect steering, clogged impeller, insufficient rotation speed. Solution: Reduce pipe resistance, check the motor direction, remove blockages from the impeller, and increase the speed. 4. The flow rate is below the designed flow rate. Reason: Clogged impeller, excessive wear in the seal ring gap, insufficient rotational speed. Solution: Remove the blockage, replace the sealing ring, and increase the speed to the value specified on the nameplate. 5. The slurry pump consumes too much power. Reason: The packing is compressed too tightly, causing the packing chamber to heat up; the impeller is worn out, and the pump flow rate is too high, exceeding the rated value. Solution: Loosen the packing gland, replace the impeller, close the gate valve to reduce flow rate. 6. Abnormal noise inside the pump; no water is pumped out. Reason: Excessive resistance in the inlet pipeline, too high suction height, air entering the suction pipe, and excessively high temperature of the liquid being transported. Solution: Check for blockages in the inlet piping, clean the bottom valve, and lower the liquid temperature or the suction height. 7. Vibration of the slurry pump set: Causes include misalignment between the pump shaft and the motor shaft, unbalanced impeller, and excessive bearing clearance. Solution: Adjust the pump and motor so that their axes are aligned; conduct a balance test on the impeller, ensuring that the unbalance weight is around 3 grams; replace the bearings. 8. Bearing overheating: Causes include lack of oil in the bearing or excessive oil viscosity, which hinders lubrication; excessive wear in the bearing resulting in large gaps; and misalignment between the pump and the motor. Solution: Refuel, use high-quality or low-viscosity lubricant, replace the bearings, and adjust the pump and motor to ensure they are concentric. 9. Unidentified noise: Cause – The slurry pump and motor are not installed concentrically, or the bearings of the pump or motor are worn, resulting in vibration. Solution: Adjust the pump and motor to ensure they are concentric, and replace the bearings with new ones. Luoyang Napute New Materials Technology Co., Ltd. 13603889856 0379-60679266