The main characteristics of the power pump are: (1) a certain pump at a certain speed has a limited lift. The work flow and shaft power depends on the system connected with the pump condition (load, pressure difference and line loss). The lift is changed with the flow rate (Figure 2). The work is stable, the transportation is continuous, the flow and pressure are not pulsating. Generally, there is no self-priming ability. It is necessary to fill the pump with liquid or pump the pipe into a vacuum to begin to work. (4) the centrifugal pump is started in the closing state of the discharge pipeline valve, and the vortex pump and the axial flow pump are started in the full open state of the valve to reduce the starting power. The centrifugal pump is suitable for direct drive with high speed motor and steam turbine. It is simple in structure, low in manufacturing cost and convenient in maintenance. The application of a wide range of performance, the centrifugal pump flow can be from a few meters to hundreds of thousands of 3/, can lift from several meters to several kilometers; axial flow pump is generally applicable to large flow and low lift (20 meters). The efficiency of the centrifugal pump and the axial flow pump is generally below 80% and up to 90%. The suitable for conveying clean small viscosity liquids (such as water), special design of the pump can transport slurry, sewage or water solids. The power pump is mainly used in water supply, drainage, irrigation, flow of liquid transport, power station storage, hydraulic transmission and ship jet propulsion.
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