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Horizontal centrifugal pump selection
Centrifugal pump pipeline is based on the principle of centrifugal force design, high-speed rotation of the impeller blades to rotate the water, the water thrown, so as to achieve the purpose of delivery. There are many types of centrifugal pumps, from the use can be divided into civilian and industrial pumps; from the transmission medium can be divided into clear water pumps, impurity pumps, corrosion pumps and so on. Centrifugal pump has the advantages of simple structure, convenient maintenance and low price. Main disadvantages: Due to the limitation of aspiration height, the installation position of the pump is very low, which is easily damp and submerged, affecting the safe operation. 1. Should choose high efficiency, low noise, energy-saving horizontal centrifugal pump, no choice to eliminate the product. 2. Should be based on the design flow, the required lift election pump, and consider the pump due to wear and tear caused by decreased pump output, according to the calculated head H by 1.05 to 1.10 coefficient after the pump; should choose the characteristic curve with 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 lifting pump should minimize the number of pumps, should be a use of a prepared; when a single pump to meet the requirements, it is not appropriate to use more than one parallel; if you must use more than one parallel operation or size of the pump with When its model, the number of units should not be too much, generally not more than two models, horizontal centrifugal pump lift range should be similar; parallel operation of each pump should still be operating within the high-performance area. 5. Living pressurized water supply system pumps should be set up spare pumps, 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. horizontal centrifugal pump with the motor voltage should be the same, and the power system should be the same as the national grid power supply system.