In a pump is a universal mechanical equipment for a wide, it is widely used in petroleum, chemical, metallurgy, mining, power, light industry, agriculture, ship selecting civil and defense departments, occupies an important position in the national economy.
The so-called reasonable selection of the pump, is to consider the pump unit and pump station investment and operation costs and other comprehensive technical and economic indicators, so as to meet the economic, security, applicable principles. Specifically, there are the following aspects:
1.Must meet the requirements of using the flow and head, which requires the pump operating time point (intersection curve and performance characteristics of the pump device) to keep running at high efficiency range, so that power is both easy to damaged parts.
2.The choice of pump is small, light weight, low cost, but also has a good characteristic and high efficiency.
3.Has a good anti cavitation performance, stable operation, long life.
4. The pump selection of the project investment, low operating costs.
Split volute centrifugal pump selection step :
1.The basic data in the open pump:
Including: the characteristics of the media, the media containing the particle diameter of the particle, the amount of content, the media temperature, the required flow pressure piping system data
2.Determine the head :
3. Determination of flow :
1). If the production process has been given the minimum, normal, maximum flow, should be considered by the maximum flow.
2). If the production process is only given normal flow, should be considered to have a certain margin.
For ns>100 the meaning of large flow and low lift pump, flow margin 5%, small flow high and pump of ns<50, flow margin 10%, 50 = ns = 100, the pump flow allowance is 5%, and the poor quality of the operation conditions of the pump, the flow margin should be 10%.
3).If the basic data only to the weight of the flow, should be converted into volume flow.
