In order to achieve energy saving, high efficiency, how […]
In order to achieve energy saving, high efficiency, how to choose the pump? There are many types and different specifications of agricultural water pumps. It is not possible to buy a pump if it is installed. Instead, the pump should be selected according to the requirements of the farmland for flow and lift.
For pumps used for irrigation, the design flow rate should be determined according to the water demand for crop growth in the irrigation area. It is often based on the amount of field water used during the peak period of crop growth during drought and no rain. If the pump can meet the water requirements of this period, it will be able to guarantee irrigation water for other growth periods.
For pumps used for drainage, the drainage flow is related to the heavy rain during the flood season, the capacity of the river network and the management level. In order to ensure that crops meet the needs of the crops, from the most unfavorable conditions, choose the period when the crops have the lowest flood tolerance and the most sensational, to determine the drainage flow.
Regarding the design of the lift, the actual terrain water level must first be met, that is, the vertical height of the water surface to the water surface of the water outlet (or head), which is obtained by field measurement. However, if this data is used to select the pump, the pump will not draw water after installation. This is because the water flow in the pipe has frictional resistance and consumes a part of the pump head. Therefore, if the selected pump can meet the requirements of the actual terrain pumping height and the pipeline loss head, the pump can work normally. The sum of the two is used as the basis for the selection of the pump.
The length of the pipeline loss head is related to the length of the pipeline arrangement. The hydraulic calculation should be carried out accurately. For the medium and small-scale irrigation districts, when the pump type is selected, the pipeline loss head can be estimated, that is, the pipeline loss head is equal to the actual terrain water pumping. Height (0.1-0.2) times.
The design flow and head determination are the main parameters of the pump selection, and the selected pump can meet the production needs.