1. The pump selection should meet the requirements of the pump station design flow, design head and water supply and drainage in different periods.
2. At the average head, the pump should run in the high efficiency zone; At the highest and lowest head, the pump should be able to operate safely and stably, without leaving the working range of the pump's high-efficiency zone. Under various working conditions of the design standard, the pump unit does not exhibit cavitation, vibration and overload.
3. Pump type adapted to head and flow changes. For pumping stations with large head amplitude, it is advisable to use a water pump with a steep decline in H-Q curve; for a pumping station with a large flow change, a pump with a gentle H-Q curve should be used.
4. When selecting the pump, it should be noted that the selected pump model and the number of units should make the pump station construction cost the least, and it is easy to construct, operate, repair and manage.
5. For cascade pumping stations, the model and number of pumps should ensure the flow coordination requirements between the upper and lower pumping stations, and try to avoid or reduce the insufficient flow or excessive flow of the lower pumping station due to improper flow coordination.
6. For the axial and mixed-flow pumps with a diameter of more than 1600mm in the impeller of the pump, there should be a device model test data; when the overcurrent component profile is greatly changed, the device model test should be re-carried out.
7. The selection of water pumps should take into account the characteristics of comprehensive utilization and development of water conservancy as much as possible.
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Pump selection should pay attention to the following points:
1. The requirements of pump flow and pump head (or pressure) must be met according to the needs of production:
2. The pump should operate within the efficient range;
3. In the long-term operation of the pump, the pump station has higher efficiency, less energy consumption and lower operating costs;
4. According to the selected pump model and number of units, the station is built, and the project investment is less;
5. In the design standard of various working conditions of the pump unit can operate normally and safely, that is, cavitation, vibration and overload are not allowed;
6. When selecting pumps, the type of pump that is convenient for installation, maintenance and operation management should be selected.
The main content of pump selection is to determine the type, type and number of pumps. Because of the supporting power machine, transmission and auxiliary equipment, the design of the pump station engineering building and the economic operation of the pump station are based on the selection of the pump, and the unreasonable selection of the pump will not only increase the investment in the project, but also reduce the operating efficiency of the pump, increase the energy consumption and operating costs of the pump station. Therefore, the selection of pumps must be paid great attention.
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