Design Institute equipment in the design, to determine the purpose and performance of the pump and select the pump. First of all, this choice from the choice of pump type and form of the beginning, then what principle to choose the pump? What is the basis? The following principles for your analysis of the pump information: First, the principle of pump selection 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 requirements of the characteristics of the medium: the transmission of flammable, explosive toxic or valuable medium pump requires shaft seal reliable or non-leak pump, such as magnetic drive pumps, diaphragm pumps, shield 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: A. Metering requirements, the selection of metering pumps B. Head high, flow is small and not suitable for small flow High-lift centrifugal pump can be used, the optional reciprocating pump , Such as the cavitation less demanding can also use the vortex pump C. Low head, when the flow is large, the choice of axial flow pump and mixed flow pump D. Medium viscosity (greater than 650 ~ 1000mm2 / s) can be considered Selection of rotor pump or reciprocating pump (gear pump, screw pump) E. Medium 75% air content, the flow is smaller and the viscosity is less than 37.4mm2 / s, the choice of vortex pump F. On the occasion of frequent start or pump inconvenience, should Selection of self-priming pump, such as self-priming centrifugal pump, self-priming vortex pump, pneumatic (electric) diaphragm pump Second, the selection of pumps Pump selection basis, should be based on process, water supply and drainage requirements, from five Considered in this respect, both the liquid delivery capacity, device lift, liquid properties, piping layout and operating conditions. 1, the flow rate is one of the important performance of the election pump 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, minimum, maximum three kinds of flow. Select the pump, based on the maximum flow, take into account the normal flow, in the absence of the maximum flow, it is usually desirable 1.1 times the normal flow as the maximum flow. 2, the lift system required for installation of the pump is another important performance data, generally to enlarge the 5% -10% head lift to choose. 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, the installation of piping system conditions refers to the liquid from the height of the liquid into the liquid distance to the suction side such as the lowest level, the highest level of the discharge side of some data and pipe specifications and length, material, pipe specifications, the number , Etc., in order to carry out the Department of combing head calculation and NPSH check. 5, the operating conditions are many, such as the operation of the liquid T saturated steam P, suction side pressure PS (absolute), the discharge side of the tank pressure PZ, altitude, ambient temperature operation is gap or continuous, the pump position is fixed Or removable.
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