Troubleshooting methods for multi-stage pumps

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This post was last edited by Catalyzing a Grain on 2018-12-29 at 10:52. The design of multi-stage pumps incorporates a balance drum, balance drum sleeves, and balance water pipe systems to balance axial forces; in addition, protruding seal ring structures are installed on the rear cover plates of each impeller, along with balance holes, which helps to balance most of the axial forces. The main product categories of multi-stage pumps include: boiler feed water pumps, stainless steel vertical multi-stage pumps, multi-stage centrifugal submersible pumps, vertical multi-stage variable-frequency pumps, vertical multi-stage piston pumps, household multi-stage submersible pumps, machine tool multi-stage cooling pumps, multi-stage sanitary pumps, multi-stage double-suction pumps, multi-stage self-priming pumps, multi-stage sewage pumps, stainless steel variable-frequency multi-stage pumps, vertical multi-stage pressure-stabilizing pumps, and vertical multi-stage fire pump sets. When in use, the most common fault with vertical multi-stage pumps is severe fluctuation in the readings of the pressure gauge and vacuum gauge, indicating that the pump is unable to draw in water. The cause of such vibration in the pressure gauge is generally an excessive suction lift, insufficient water supply for filling, or air present due to loose threaded connections in the pipes and instruments. Solve the issues corresponding to these three reasons: 1. Check whether the bottom valve is leaking, 2. Fill it with water, 3. Tighten the area where air is leaking. The second common fault is that the vertical multi-stage pump fails to draw in water, but the pressure reading on the vacuum gauge is high. Cause of failure: Clogged filter, clogged bottom valve, excessive resistance in the suction pipeline. Solution: Check the bottom valve and clean the filter. Third common fault: The pressure gauge of the vertical multi-stage pump shows pressure, but no water is discharged. The reasons for this failure to discharge water are: 1. Clogged impeller, 2. Possibly excessive resistance in the discharge pipe, 3. Incorrect rotation direction, 4. The valve on the outlet pipe is not open. Solutions: 1. Remove debris from the impeller, 2. Carefully inspect the water pipes, 3. Check the connections between the motor terminals, 4. Open the outlet valve.