Precautions for the Maintenance and Care of Multistage Pumps

When a multistage pump is to be stopped, first close the gate valve and pressure gauge, then turn off the motor. During the first month of operation, change the lubricating oil after 100 hours, and thereafter replace it every 500 hours. Regularly adjust the gland packing to ensure normal dripping in the stuffing box (preferably dripping out drop by drop). Periodically inspect the wear of the shaft sleeve, and replace it promptly if significant wear is observed. When using the multistage pump in cold winter, after stopping the pump, unscrew the drain plug at the lower part of the pump body to drain the medium completely to prevent freezing and cracking. If the multistage pump is to be out of service for a long time, fully disassemble the pump, wipe it dry, apply grease to the rotating parts and joints, and reassemble it.

Daily maintenance of the water pump is crucial, and regular upkeep is necessary.

Regularly check whether the motor and the pump body's lubrication points lack oil, and whether the bearing operation sound is normal during the pump's operation.

Ensure the concentricity of the motor and pump couplings is consistent.

Check whether there is any leakage of water or air in the pump's suction pipeline.

Inspect whether the balance pipe is blocked.

Verify whether the pump's outlet pressure is normal.

Monitor whether the pump experiences excessive vibration during operation.

Check whether the pump bearing seat is overheating.

Ensure manual rotation of the pump is flexible.

Confirm whether the pump installation foundation is secure.

For pumps using packing seals, regularly add, tighten, or replace the shaft sleeve.

Check for any loosening in the multistage pump's pipelines and joints. Manually rotate the multistage pump to test its flexibility. Add bearing lubricating oil to the bearing housing, ensuring the oil level is at the centerline of the oil gauge. Replace or replenish the lubricating oil promptly. Unscrew the priming plug of the pump body and fill it with water (or slurry). Close the gate valve of the outlet pipeline, as well as the outlet pressure gauge and inlet vacuum gauge. Briefly start the motor to verify its rotation direction. Start the motor, and once the multistage pump operates normally, open the outlet pressure gauge and inlet vacuum pump. After observing the appropriate pressure display, gradually open the gate valve while monitoring the motor load. Try to control the flow and head of the multistage pump within the range indicated on the nameplate to ensure operation at the highest efficiency point and achieve maximum energy savings. For DF-type multistage pumps during operation, the bearing temperature should not exceed the ambient temperature by 35°C, and the maximum temperature must not exceed 80°C. If abnormal sounds are detected in the multistage pump, immediately stop it and investigate the cause.