Submerged pump selection based on the process should be based on water supply and drainage requirements, from the liquid delivery volume, the device head, liquid properties, piping layout and operating conditions to be considered in five areas. 1, the flow rate is one of the important performance data of the selected liquid pump, which is directly related to the entire plant's production capacity and delivery capacity. Pump selection, based on the maximum flow, taking into account the normal flow, in the absence of maximum flow, it is usually desirable 1.1 times the normal flow as the maximum flow. 2, the lift system required for the system is selected fluid pump another important performance data, generally to enlarge the 5% -10% head lift to choose. 3, submerged pump system piping system conditions refers to the liquid from the liquid level to send a high degree of liquid delivery, in order to carry out the system lift calculation and NPSC checks. 4, 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 choice of submerged pump material and choose an important basis for the type of shaft seal. 5, liquid pump 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 container pressure PZ, altitude, ambient temperature operation is intermittent or continuous, the pump position Is fixed or removable?
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