In order to achieve energy saving, high efficiency, the pump selection how? There are many types of agricultural pumps and different specifications, not just buy a pump can be installed to use, but according to farmland flow and lift requirements to choose the pump. The pump used for irrigation should be designed according to the amount of water required for crop growth in the irrigation area. It is often based on the field water consumption at the peak of water demand during the growing season of crops in arid and no rainy season. If the pump can meet the water requirements of this period, it will be able to ensure irrigation water for other stages of growth. Pumps used for waterlogging, drainage flow and rainy season, river network storage capacity and management level. In order to ensure the crops receive waterlogging, from the most unfavorable situation, choose the lowest flooding resistance of crops and the most likely to occur during the flood situation to determine the drainage flow. On the design of lift, first of all must meet the actual terrain elevation, that is, the water source to the pool (or head) the vertical height of the water surface, measured using the field. However, if this data is used to select a pump, the pump will not pump water after installation because of the frictional resistance of the flow in the pipe and the loss of part of the pump head. Therefore, the choice of the pump, if able to meet the actual top elevation and pipeline head lift pumping requirements, the pump will be able to work properly. The sum of the two is used as the basis for the pump selection. The size of the pipeline loss lift value is related to the length of the pipeline layout. Accurate hydraulic calculation should be carried out. For medium and small-scale irrigation areas, when the primary pump type is selected, the estimation of pipeline loss lift can be made using the estimation method that the pipeline loss lift is equal to the actual topography Height (0.1-0.2) times. The design flow and lift are the main parameters of the pump selection, according to which the pump can be selected to meet the production needs.
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