Pump selection basis, should be based on process flow, water supply requirements, can be considered from five aspects, both liquid delivery, device head, liquid properties, piping layout and operating conditions, etc..
1. Colloid mill flow is one of the important performance data of the pump, it is directly related to the production capacity and transmission capacity of the whole device. If the design process design can calculate the pump normal, minimum, maximum three kinds of flow. Select the pump to the maximum flow basis, taking into account the normal flow, in the absence of maximum flow, usually desirable 1.1 times the normal flow as the maximum flow.
2. The system is required to lift the pump is another important performance data, the general use of enlarged 5% - 10% residual head to choose.
3. Liquid properties, including the name of the liquid medium, physical properties, chemical properties and other physical properties of a temperature C density D, the viscosity u, medium diameter of solid particles and gas content, which involves the system's head type, effective cavitation margin calculation and the right pump: chemical properties, mainly refers to the chemical corrosive liquids and toxic, pumps are selected materials and use is a major basis seal.
4. Pipeline layout conditions of equipment system refers to send high fluid delivery fluid delivery fluid from toward the suction side such as the minimum level, the highest level from the side, some data and specifications and the length of pipe, pipe materials, specifications, quantity, check for line comb head calculation and npsh.
5. The contents of many operating conditions, such as the operation of the liquid T saturated steam power P, the suction side pressure PS (absolute), pressure from the container side PZ, altitude, ambient temperature operation is a gap or continuous, the location of the pump is fixed or movable.
