1. The multistage pump should first drive the pump motor several times before starting to avoid the graphite ring breakage caused by sudden movement;
2. Seal leakage tolerance 3 drops / MIN, otherwise it should be overhauled;
3. Mechanical seal lubrication should be cleaned without solid particles;
4. It is strictly forbidden to work mechanical seals under dry grinding conditions.
Three major maintenance points for multistage pumps in operation:
1. The inlet pipe must be filled with liquid, and the pump is prohibited from running for a long time under cavitation.
2. Check the motor current value regularly, and do not exceed the rated current of the motor.
3. After long-term operation of multistage pump, due to mechanical wear, when the noise and vibration of the unit increase, it should be stopped to check and replace the wearing parts if necessary. The overhaul period of the unit is generally one year.
