The choice of Grundfos pumps the correct choice of a type of pump selection pump flow, head flow: 1, if the production process has been given the smallest, normal, maximum flow, should be considered the maximum flow. 2, 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% of ns 3, if the basic data only to the weight flow, should be converted into volume flow. Grundfos pump selection step Two, select the pump lists the basic data: 1, the characteristics of the media: media name, specific gravity, viscosity, corrosion, toxicity and so on. Second, the medium contained in 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 matters: 1, a reasonable choice of pipe diameter, pipe diameter, the same flow, the flow rate is small, the resistance loss is small, but the price is high, pipe diameter, will lead to 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. 2, the discharge pipe and its fittings should consider the maximum pressure that can bear. 3, the pipe layout should be arranged as straight pipe, pipelines to minimize the attachment and minimize the length of the pipe, you must turn when the elbow bend radius should be 3 to 5 times the pipe diameter, the angle is greater than 90 ℃. 4, 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 flows backwards, a great reverse pressure will be generated and the pump will be damaged.) However, in various fields of the national economy, due to the unreasonable selection, many of the pumps are in an unreasonable operation condition, and the operation efficiency is low, which istes a lot of energy . Some pump 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 also of great significance for saving energy. 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, ie, the point at which the pump is required to operate (the intersection of the device characteristic curve and the pump performance curve) is often maintained in an efficient range, thus saving power Not easy to damage the mechanical parts. The selected Grundfos pumps should be small, light weight, low cost, but also have good characteristics and high efficiency. Has good anti-cavitation performance, so that both to reduce the depth of the excavation of the pump room, without Gavo pump cavitation, smooth operation, long life. According to the selected Grundfos pumps built pumping station, less investment, low operating costs. Grundfos Model Information Pump Popular brands: Sany Yamaha seamless pipe Lenovo Pioneer Global Changan Changan ems ina Wuxi Grundfos Model High-quality manufacturers: Nanjing Kowo system engineering company Grundfos Pump Beijing Co., Ltd. Germany Ville Pump Group Co., Ltd. Nanjing Elta Pump Co., Ltd. Nanjing Davide Mechanical and Electrical Equipment Co., Ltd. [Editor's note] "Grundfos pumps a variety of models, how to correct selection?" Is the most concern of many users, Today, Asia Fluid Network effort to sort out Grundfos pump selection "secret", do you get it? Quickly share to your side of the small partners now! Internet Industry (Xiamen) Technology Co., Ltd. Author: Asian pumps Network (CEO QQ / micro letter: 18,189,528) Editor: Lin cotton (QQ / micro-channel:) starting: http: //beng.liuti.cn/ (Hotline: 400- 6030-811)
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