Water Absorption Test of Jet Pump Used by Vacuum Preloading

Vacuum extractor in North Port is composed of submersible pump,jet spray and water tank.The main power of diving pump are 7.5 kW and 5.5 kW,the main model of jet spray include φ50×φ25(pipe diameter × nozzle diameter),φ50×φ22,φ40×φ20,φ30×φ20,etc,φ30×φ20 jet spray is widely used in boreal ports.A water absorption test that the field commonly used submersible pump connected to different types of commonly used jet spray were tested in laboratory and the test results were analyzed.The area ratio of jet spray between 3 to 6 is more efficiency that the water absorbed per unit time or per unit energy consumption is more plenty and the vacuum is lower in this area.The jet spray which nozzle diameter is 25 mm,22 mm,pipe diameter is 50 mm working more efficiency than the pipe diameter is 40 mm and 30 mm.The jet spray of 30×20 is not recommended to be used in vacuum preloading because of lower efficiency.