After determining the design flow and design head of the pump station, you can use the relevant technical charts to determine the pump model and specifications. The method is as follows:

1. Use the pump performance specification table to select the pump type. The pump factory provides this table in the product catalog. The performance of each model in the table has three rows of data. Which one should prevail? Generally, the design flow rate and the design head should be consistent with or close to the values in the middle row listed in the performance table, and must fall within the range of the upper and lower rows, because this range is the high efficiency area of the pump operation. This type of pump is considered to meet actual needs, and the pump is selected.

2. Use the pump selection table to select the pump type. According to the determined design head and design flow, in the selection table, find the head value that is consistent with or close to the design head in the selection table; The design flow is consistent or close to the flow value, which intersects in the small square vertically and horizontally. It marks the pump model, and the pump type is initially selected. But sometimes it appears that both pump types meet the design requirements. At this time, you can compare the two pump types, perform a technical and economic analysis, and then select one of the appropriate pump types. This method of selecting a water pump is relatively simple and fast.

3. Use the comprehensive spectrum of pump performance to select the pump type. Draw all the working areas of centrifugal pumps, axial flow pumps, and mixed flow pumps on the same graph, which constitutes a comprehensive spectrum of agricultural water pump series. This graph is drawn for comparison. Complicated, but more convenient to use.

According to the determined design flow and design head, on the type spectrum, first find out several pumps that meet the requirements of the head with the design head on the ordinate, but with different flow rates, and then use the design flow on the abscissa to determine the selection Which kind of pump. If a single pump fails to meet the requirements when the design flow is large, multi-machine operation can be considered, but it should be noted that pumps of the same model should be used as much as possible to facilitate construction, installation, management and maintenance.