The correct way to select the pump model and specifications:
After determining the design flow and design head of the pumping station, you can use the relevant technical chart to determine the pump model and specifications. The method is as follows:
First, use the pump performance specification table to select the pump type
The pump factory provides this form in the catalogue. The performance of each model in the table has three lines of data. Which one is the correct one? The general design flow and design head should be consistent with the values ​​in the middle row listed in the performance table, or close to each other, and must fall within the upper and lower rows, because this range is the high efficiency area of ​​the pump operation. This type of pump is considered to be in line with actual needs, and the pump is selected.
Second, use the pump selection table to select the pump type
According to the determined design head and design flow, in the selection table, the horizontal head looks for the head value that is consistent with or close to the design head; and then finds the flow value that is consistent with or close to the design flow in the vertical head. The vertical and horizontal intersects the small square, which marks the model of the pump and initially selects the pump type. However, there are occasions when both pump types meet the design requirements. In this case, the two pump types can be compared for technical and economic analysis, and then one of the appropriate pump types is selected. This method of selecting a water pump is relatively simple and quick.
Third, use the pump performance comprehensive spectrum to select the pump type
The working areas of the centrifugal pump, the axial flow pump and the mixed flow pump are all drawn on the same picture, which constitutes a comprehensive spectrum of the agricultural water pump series. The drawing is more complicated, but it is more convenient to use.
According to the determined design flow and design head, on the type spectrum, firstly, on the ordinate, the pump is designed to find the pumps that meet the head requirements and the flow rates are not equal, and then the design flow is used to determine the selection on the abscissa. Which kind of pump. If the design flow is large, the single pump fails to meet the requirements, and multi-machine operation can be considered, but it should be noted that the same type of water pump should be used as much as possible to facilitate construction, installation and maintenance.