Principle and Selection of Pump Selection Principle Pump is a kind of universal mechanical equipment widely used in petroleum, chemical, power metallurgy, mining, shipbuilding, light industry, agriculture, civil and national defense, In the national economy occupies an important position. According to the statistics of 2002, the pump output in our country reached more than 2 million units, and the power consumption of the pump accounts for more than 21% of the national electricity consumption. Therefore, reducing the pump energy consumption greatly is of great significance for saving energy. At present, in all fields of the national economy, due to unreasonable selection, many pumps are in an unreasonable operating condition, and their operation efficiency is low, thus wasting a lot of energy. Some pumps because the selection is not reasonable, can not be used, or the use of maintenance costs increase, low economic benefits. Thus it can be seen that the rational selection of pumps is equally important for energy conservation. 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: Flow and lift requirements must be met, which means that the operating point of the pump (the intersection of the device characteristic curve and the pump performance curve) is often maintained in an efficient range so that both the power is saved 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 both to reduce the pump platform strength, without cavitation pump, smooth operation, long life. Pumping station selected by the pump, less investment, low operating costs. Selection step a, lists the basic data: 1, the characteristics of the media: media name, specific gravity, viscosity, corrosive, toxic and so on. 2, the medium contained in the solid 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 backflow, will have a huge reverse pressure, so that the pump damage) to determine the flow head Second, determine the flow 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 high flow low lift pump, the flow margin taken, for ns c, if the basic data only to the weight flow, should be converted into volume flow. Although most of the pumps are always designed for different environments, the service life and efficiency requirements of our customers are increasing. Our engineers are experienced experts in the fields of design, material selection and monitoring. In addition to developing new In addition to design, we often exchange experiences with our customers, continually improve our existing technology and provide the best designs for our clients' projects and projects. Many customers benefit from the experience and right choices of Shanghai Shenbei Pump Manufacturing Co., Ltd. Our extensive product range and strong engineering capabilities enable us to provide both economical and durable pumps to ensure that your products are used without worries .
