Pump the right type of selection

The so-called rational selection of pumps, is to comprehensively consider the pump unit and pumping station investment and operating costs and other comprehensive technical and economic indicators, to make it in line with economic, security and applicable principles. Specifically, the following aspects must be met: the flow rate and head lift of the pump must be met, that is, the point at which the pump runs (the intersection of the device characteristic curve and the pump performance curve) is often maintained in an efficient range, Power is not easy to damage the mechanical parts. The selected pump should not only small size, light weight, low cost, but also have good characteristics and high efficiency. Has good anti-cavitation performance, so that not only can reduce the depth of the excavation of the pump room, but also to pump cavitation, smooth operation, long life. According to the selected pump built pumping station, less investment, low operating costs. Pump selection step A, lists the basic data: 1, the characteristics of the media: media name, specific gravity, viscosity, corrosion, toxicity and so on. 2, contained in the media due to the body particle diameter, content how much. 3, the medium temperature: (℃) 4, the required flow General industrial pumps in the process can be ignored in the pipeline leakage, but must consider the impact of process changes on the flow. Agricultural pumps if the use of open channel water, but also must consider the leakage and evaporation. 5, pressure: suction tank pressure, drainage tank pressure, pressure drop in the piping system (head loss). 6, the piping system data (diameter, length, type and number of pipe fittings, water tank to the pressure tank geometric elevation, etc.). The device characteristics should also be made if necessary. 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 pump lift the selected increase, with increased power costs and operating costs have increased. Therefore, it should be considered technically and economically. B, discharge pipe and its fittings should consider the maximum pressure that can bear. 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 have a huge reverse pressure, so that the pump damage) Second, to determine the pump head flow to determine a, if the production process has been given the smallest, normal, maximum flow, should be considered the maximum flow. b, if the production process is only given normal flow, should consider leaving a certain margin. For ns> 100 large low-flow pump with its head, the flow margin taken 5%, ns c, if the basic data only to the weight flow, should be converted into volume flow.

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