Operation and maintenance of water ring vacuum pumps

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I. Starting: Before starting a pump that has been idle for a long time, the coupling must be turned by hand several times to ensure there is no sticking. The starting process follows the sequence below. Close the valve on the intake pipe ； Fill the stuffing box and air-water separator with water ； Start the motor when water overflows from the gas-water separator ； Open the ball valve on the water supply pipeline ； Open the valve on the intake pipe ； Use a ball valve to adjust the water inflow rate, in order to use the minimum amount of water while still meeting the technical specifications required by the pump. II. Parking (in the following order): Close the valve on the intake pipe ； Turn off the motor ； Turn off the water valve ； When the pump is shut down in winter, the pipe plugs on the pump should be removed to drain all the water. III. Maintenance 1. The vacuum level shall not be controlled by reducing the valve opening to adjust the pumping rate. 2. Regularly check for fluctuations in vacuum level and pump vibration. 3. During operation, check whether the packing box is heating up and address the issue promptly. 4. Check whether the pump operates with any abnormal noises; any issues detected should be addressed promptly. 5. Check whether the cooling water is blocked; the water temperature should not exceed 40°C. 6. Check whether the bolts in various components and the foundation foot bolts are loose; any looseness found should be addressed promptly. 7. The location where the vacuum pump is installed should be kept clean, dry, and well-ventilated. 8. The packing should be compressed regularly; if it fails to meet the sealing requirements, it should be replaced promptly. 9. Rolling bearings should be properly lubricated. 10. Regularly check the temperature of the rolling bearings during operation. 11. Bearings that are operating properly should have their oil changed 3–4 times per year; they should also be cleaned at least once a year, with all the lubricant replaced. 12. Make sure to keep the pump body and its accessories clean. 13. In winter, drain all the water from within the pump and the water tank after parking.