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Pump Selection Principle 1, the type and performance of the selected pump in line with the device flow, head, pressure, temperature, cavitation flow, suction stroke and other process parameters. 2, must meet the characteristics of the media requirements. Pumps that deliver flammable, explosive toxic or valuable media require dependable shaft seals or leak-free pumps such as magnetically driven pumps, diaphragm pumps, shielded pumps. Conveyance of corrosive media pump, convection parts require corrosion-resistant materials, such as AFB stainless steel corrosion-resistant pump, CQF engineering plastic magnetic drive pump. Pumps containing solid particulate media are required to have a wear-resistant material for the convection components and flush with a cleaning fluid if necessary. 3, high mechanical reliability, low noise, small vibration. 4, the economic should take into account the equipment costs, operating costs, maintenance costs and management fees the lowest total cost. 5, centrifugal pump with high speed, small size, light weight, high efficiency, large flow, simple structure, infusion without pulsation, stable performance, easy operation and maintenance features such as convenience. Therefore, in addition to the following circumstances, the centrifugal pump should be used as far as possible: When there are measurement requirements, the choice of metering pump head is very demanding, the flow is small and not suitable for small flow High-lift centrifugal pump can be used when optional reciprocating pumps such as cavitation When the requirement is not high, the vortex pump can also be used. The lift is very low. When the flow rate is very high, the axial pump and the mixed flow pump can be used. Medium viscosity (greater than 650 ~ 1000mm2 / s), consider the use of rotor pump or reciprocating pump (gear pump, screw pump) medium 75% gas content, the flow is smaller and the viscosity is less than 37.4mm2 / s, the choice of vortex Pump. On the occasion of frequent or inconvenient irrigation pump should be used with self-priming performance, such as self-priming centrifugal pump, self-priming vortex pump, pneumatic (electric) diaphragm pump. General industrial pumps in the process can ignore the leakage in the pipeline system, but must consider the impact of process changes on the flow. If agricultural pumps are used to transport open channel, we must also consider the leakage and evaporation. Pressure: suction tank pressure, drainage tank pressure, pressure drop in the piping system (head loss). Pipeline system data (diameter, length, type and number of pipe attachments, geometry of sump to sump). If necessary, device characteristics should also be made. In the design and layout of the pipeline, should pay attention to the following: A, a reasonable choice of pipe diameter, pipe diameter, the same flow, the flow velocity is small, the resistance loss is small, but the price is high, the pipe diameter is small, will lead to a sharp increase in resistance loss Large, so that the selected pump lift, with increased power costs and operating costs have increased. Therefore, it should be considered technically and economically. Exhaust pipe and fittings should consider the maximum pressure can be. C, pipe layout should be arranged as straight pipe, pipe fittings to minimize and minimize the length of the pipeline, you must turn when bending the elbow bend radius should be 3 to 5 times the pipe diameter, the angle is greater than 90 ℃. D, the discharge side of the pump must be installed valves (ball valve or globe valve, etc.) and check valve. The valve is used to adjust the operating conditions of the pump. The check valve prevents the pump from reversing when the fluid is flowing backwards and prevents the pump from hitting the water hammer. (When the liquid back, it will produce a huge reverse pressure, so that the pump damage) to determine the flow head flow to determine If the production process has been given the minimum, normal, maximum flow should be considered at the maximum flow rate. If the production process only gives normal flow, should consider leaving a certain margin. For ns> 100 large low-flow pump its unpleasant, flow margin take 5, ns If the basic data only to the weight flow, should be converted into volume flow.