Reasonable selection of Horizontal centrifugal pump requires comprehensive consideration of 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 applicability. Specifically include the following aspects:

1. High efficiency, low noise, and energy-saving pumps should be selected, and it is strictly forbidden to choose eliminated products.
2. The manufacturer of Horizontal centrifugal pump tells you that the pump should be selected according to the design flow rate and the required head, and considering the decrease of the output of the pump due to wear and other reasons, the pump can be selected according to the calculated head H multiplied by a coefficient of 1.05 to 1.10; the characteristics should be selected The curve is a water pump whose head gradually decreases as the flow increases. Such a pump works stably and is reliable when working in parallel; and the operating point of the water pump should be kept in the high-efficiency range, which saves energy and is not easy to damage the parts.
3. When the water supply pipe network has no adjustment facilities, it is advisable to use the speed-regulating pump group or the rated speed pump group to run the water supply. The maximum water output of the pump set should not be less than the design water supply flow of the community, and should be checked according to the fire protection conditions.
4. The Horizontal centrifugal pump manufacturer tells you that the number of pumps should be reduced as much as possible when selecting the lift pumps for water tanks and water towers. It is advisable to use one and reserve the other; when a single pump can meet the requirements, it is not suitable to use multiple parallel connections; if it is necessary to use multiple parallel connections When operating or matching large and small pumps, the type and number of pumps should not be too many. Generally, there should be no more than two types. The lift range of the pumps should be similar; when running in parallel, each pump should still run within the high-efficiency range.
5. The design water supply flow rate of the variable frequency speed regulating pump (group) should ensure that it meets the requirements of the maximum design second flow rate in the domestic water supply system. The horizontal centrifugal pump manufacturer tells you that the power supply must be reliable (dual power supply or double-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. The most unfavorable working point should be at the right end point of the high-efficiency section of the pump characteristic curve, that is, the point where the water output of the pump is the largest and the head is low but can meet the requirements, that is, the low point of the high-efficiency section of the pump characteristic curve and the point of the pipeline characteristic curve. intersection. The working range of the speed regulation of the pump should be within the high efficiency section of the pump; the speed regulation range should be set between 25% and 100% of the water supply 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 backup pump. The water supply capacity of the backup pump should be greater than the water supply capacity of the largest running water pump. The water pump should be automatically switched and operated alternately.
7. The motor voltage of the horizontal centrifugal pump should be the same, and the power supply system should be the same as the national grid power supply system.