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The main content of pump selection is to determine the appropriate pump type, model and number based on the lift, flow rate and changing patterns required by the project. The selection is based on the design parameters determined in the project planning and design. The selection of the pump is based on the main design basis of the supporting power machine, transmission and auxiliary equipment and the pump-related buildings, and must be paid great attention to.
The basic principles for selecting energy-saving water pumps are as follows:
​ ​ 1. The flow and head (or pressure) requirements during the production process must be fully met according to the needs of production.
​ ​ ​ 2. Select a pump type with good performance and strong adaptability and guarantee to the changes in flow and head required by the project. First, among the finalized series of products, a water pump with high efficiency, good suction performance, and wide range of use should be selected. When there are multiple pump types to choose from, a technical and economic analysis should be conducted to select the best one. When a series of products cannot meet the selection requirements, new products can be designed and trial-produced according to prescribed procedures. When the lift required by the project changes greatly, a pump with a steep drop in the H-Q curve should be selected; when the flow rate required by the project changes greatly, a pump with a gentle H-Q curve should be selected.
3. Try to make the selected pump operate within its high efficiency area, that is, near the design (rated) operating point. The pump unit can operate normally and safely under various working conditions according to the design standards, that is, no cavitation, vibration, overloading, etc. will occur.
​ ​ 4. The selected pump has high average device efficiency, low energy consumption and low operating costs in long-term operation.
​ ​ 5. The selected pump model and number can save money on the investment in the entire system (the total equipment cost and civil engineering and installation engineering investment).
​ ​ 6. Easy to construct, easy to operate, manage and maintain.
​ ​ 7. For cascade-operated pumps, the pump model and number should meet the flow coordination requirements between the upper and lower-level pumps; try to avoid and reduce insufficient flow or excessive flow of the lower-level pumps caused by improper flow coordination.
​ ​ 8. For large axial flow pumps and mixed flow pumps, there should be device model test data; when major changes are made to the prototype, the device model test should be re-carried out.
9. When selecting pumps for agricultural drainage and irrigation projects, the requirements of comprehensive water conservancy development should be taken into account as much as possible.