To select a horizontal centrifugal pump reasonably, it is necessary to comprehensively consider comprehensive technical and economic indicators such as pump unit, pump station investment and operating costs, so that it conforms to the principles of economy, safety and application. Specifically, it includes the following aspects:

1. High-efficiency, low-noise, energy-saving pumps should be selected, and it is strictly forbidden to choose outdated products.
2. The pump should be selected according to the design flow and the required head, and considering the drop of the pump output due to wear and tear of the Horizontal centrifugal pump, the pump can be selected according to the calculated head H multiplied by the coefficient of 1.05~1.10; the characteristic curve should be selected as the flow rate. Increase the pump whose lift is gradually lowered. This kind of pump works stably and is reliable when working in parallel; and the operating point of the pump should be kept in the high-efficiency range, which saves energy and is not easy to damage the parts.
3. When there is no adjustment facility in the water supply network, it is advisable to use a speed-regulating pump group or a rated speed pump group to run the water supply. The maximum water output of the pump set should not be less than the design flow of the residential water supply, and should be checked against fire protection conditions.
4. The number of pumps should be minimized when selecting lifting pumps for water tanks and water towers. One should be used and one should be prepared. When a single pump can meet the requirements, it is not appropriate to use multiple parallel pumps. The horizontal centrifugal pump manufacturer tells you that if multiple parallel pumps must be used When running or matching large and small pumps, the model and number of pumps should not be too many, and the models should not exceed two.
5. The design water supply flow of the variable frequency speed regulating pump (group) should ensure that it meets the requirements of the maximum design second flow in the domestic water supply system. The power supply must be reliable (dual power supply or dual-circuit power supply); the working point of the pump should be selected in the high-efficiency working area of ​​the pump characteristic curve (Q-H curve), and should not be selected on the extension line of the Q-H curve, and the most unfavorable working point should be designed. At the right end point of the high-efficiency section of the pump characteristic curve, that is, the point where the pump output is the largest and the lift is low but can meet the requirements, that is, the intersection of the low point of the high-efficiency area of ​​the pump characteristic curve and the pipeline characteristic curve. The working range of the speed regulation of the pump can be within the high-efficiency section of the pump as much as possible; the speed regulation range should be set between 25% and 100% of the water supply volume of the pump; the equipment should have the function of automatic water level control.
6. The water pump unit of the domestic pressurized water supply system should be equipped with a standby pump. The water supply capacity of the standby horizontal centrifugal pump should be greater than that of the largest running water pump. The water pump should be automatically switched and operated alternately.
7. The horizontal centrifugal pump manufacturer tells you that the voltage of the motor equipped with the pump should be the same, and the power supply system should be the same as the national grid power supply system.