In the selection of horizontal centrifugal pump need to consider many factors, it not only need to take into account the pump unit, pumping station investment and operating costs and other related economic factors, but also to consider the safety of equipment, Applicable situation. All in all is to horizontal centrifugal pump selection in line with economic, applicable, safety and other principles. Specific details include the following aspects: Horizontal Centrifugal Pump Selection 1) should choose high efficiency, low noise, energy-saving pumps, non-selection of products to be eliminated. 2) Pumps should be selected according to the design flow, the required lift pump, and consider the pump due to wear and tear causes the pump output decreased, according to the calculated head H multiplied by 1.05 to 1.10 coefficient after the pump; should choose the characteristic curve as the flow rate increases Its head is gradually decreased pumps, such pumps work stable, reliable work in parallel; and the pump operating point of operation should be maintained in high-efficiency operation, so that energy-saving and not easy to damage the mechanical parts. 3) When there is no regulation of water supply network facilities, should be used speed pump group or rated speed pump group marshalling run water supply. The maximum output of the pump group should not be less than the design of district water flow, and should check the fire conditions. 4) Choose water tank, water tower lift pump should minimize the number of pumps, should be a use of a prepared; when a single pump can meet the requirements, it is not appropriate to use more than one parallel mode; If you must use more than one parallel operation or size pump with When its model, the number of units should not be too much, generally not more than two models, the pump lift range should be similar; parallel operation of each pump should still be operating within the high-efficiency zone. 5) Living pressurized water supply system should be set up standby pump pump unit, spare pump water supply capacity should be greater than the maximum capacity of a running water pump, the pump should automatically switch, alternating operation. 6) The pump with the motor voltage should be the same, and the power system should be the same as the national grid power supply system. The selection of each product is a headache for the user. If the product can not be selected for proper work and production, it will not only delay the production of the project, but may also waste more resources and thermal and physical resources. For horizontal centrifugal pump selection not only to consider its work, while meeting the economy and safety.