One of the water ring vacuum pump is a two-stage water ring, mainly by the eccentric impeller and pump shell composition. The main principle: vacuum pump unit normal operation, gas and water mixture is sucked into the vacuum pump inlet, due to the eccentric arrangement of the vacuum pump impeller. Suction inlet volume, outlet volume is small, so that gas and water mixture from import to export, the volume from large to small compressed, discharged to the separator, the gas is discharged to the atmosphere, the water is divided into two sealed pumps, all the way for The pump seal water, the other way through the two nozzles into the vacuum pump inlet to form a jet effect, thus further pumping non-condensable gas pump isolation 1. Close a small machine high and low pressure into the electric door pull listed. 2. Turn off the small exhaust fan valve and high start exhaust valve; 3. Close the small shaft seal, return steam manual door; 4. Turn off the pump to over, then hot manual water heating door, 5. Close the pump outlet electric door, pull the electric listing; 6. Shut down the small machine disk car; 7. Turn off the pump warm pump door, hanging ban card; 8. Close the pump main pump recirculation door isolation door, Shut down forbidden license plate; 9. close the pump before the pump recirculation door isolation door, ban card; 10. close the pump seal water transfer before and after the isolation door and bypass door, listing; 11. shut down steam Pump front pump inlet electric door, pull the electric listing; 12. Open the pump body deflation valve; 13. Open the top of the pump front pump deflation valve and the bottom of the drain valve; 14. Open the pump front pump inlet pipe to drain, Vent valve; 15. Open the pump inlet pipe drain. Turbocharged operation of the steam turbine what provisions of the turbine trip when the crew will restart in a short time (the vacuum is not damaged), the hydrophobic door does not need to be closed; if the unit has some time to start, the turbine speed has reached zero, turning Has been put into operation before the vacuum damage, do not operate hydrophobic Manual door vacuum damage, the following four manual doors need to be closed, open the vacuum recovery start. # 1 Main steam door front hydrophobic manual door, # 2 Main steam door front hydrophobic manual door, main steam to small machine main pipe drain manual door, main steam to shaft seal drain manual door. If a small machine A / B high and low pressure steam source is not isolated, you need to turn off the main steam to the small machine A / B for steam pipe hydrophobic manual door. When the unit is out of service After the unit is out of service, the following four manual doors will be closed before the vacuum is destroyed, and will be opened when the boiler pressure drops below 0.5MPa. # 1 Main steam door front hydrophobic manual door, # 2 Main steam door front hydrophobic manual door, main steam to small machine main pipe drain manual door, main steam to shaft seal drain manual door.