Gear pump selection basis

Gear pump selection basis, should be based on process, water supply and drainage requirements, to be considered from five aspects, both liquid delivery capacity, the device head, liquid properties, piping layout and operating conditions, etc. 1, the flow rate is an important gear pump Performance data, which is directly related to the entire plant's production capacity and delivery capacity, such as the design process can be calculated in the pump normal, the smallest, three kinds of flow selection gear pump, based on large flow, taking into account the design of gear pump Manual normal flow, in the absence of large flow, it is usually desirable 1.1 times the normal flow as a large flow. 2. The lift required for the installation system is another important performance data for the gear pump. Generally it should be selected after the lift is enlarged by 5% -10%. 3, the liquid properties, including the name of the liquid medium, physical properties, chemical properties and other properties, the physical properties of the temperature c density d, viscosity u, medium particle diameter and gas content, etc., which involves the system lift, effective gas Erosion margin calculation and the type of suitable pump: Chemical nature, mainly refers to the liquid medium chemical corrosion and toxicity, is the selection of pump materials and choose an important basis for the type of shaft seal. 4, many operating conditions, such as the operation of the liquid T saturated steam P, suction side pressure PS (absolute), the discharge side of the container pressure PZ, high altitude. 5, the installation of piping system conditions refers to the liquid from the height of the liquid from the liquid to the suction side, such as suction side of the lowest level, the discharge side of the highest level of some data and pipeline specifications and length, material, pipe specifications, the number , Etc., in order to carry out the Department of combing head calculation and NPSH check.

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