1、 Maintenance of chemical centrifugal pump in operation 1. the water pipeline must be highly sealed. 2. long term operation of the pump under cavitation condition is prohibited. 3. it is forbidden to operate the motor for a long time with overcurrent when the pump is running at flow. 4. regularly check that the motor runs over current for a long time when the pump is running. 5. the pump shall be watched by a specially assigned person during operation to avoid accidents. 6. oil the bearing every 500 hours of pump operation. Motor power greater than 11kw is equipped with oil filling device, which can be directly injected with high-pressure oil gun to ensure excellent bearing lubrication. 7. after long-term operation of the pump, if the noise and vibration of the unit are increased due to mechanical wear, the pump shall be stopped for inspection. If necessary, the vulnerable parts and bearings can be replaced. The overhaul period of the unit is generally one year. 2、 Maintenance of chemical centrifugal pump mechanical seal 1. mechanical seal lubrication shall be clean and free of solid particles. 2. it is strictly prohibited to work the mechanical seal under the condition of dry grinding. 3. before starting, turn the pump (motor) for several circles to prevent the seal ring from being broken and damaged due to sudden starting.