Pump selection
     Pump selection basis, should according to process flow, water supply and drainage requirements, from five aspects into consideration, both liquid throughput, device, liquid property, pipe head decorate and operate conditions.
   1. The flow rate of the pump is to choose one of important performance data, it's directly related to the whole device of production capacity and transmission capacity. Such as design institute process design can calculate pumps, minimum, maximum three flow. Choose pump when, with the maximum flow as the basis, take into account the normal flow, in no maximum flow, usually desirable 1.1 times of the normal flow as the maximum flow.
   2.Device that required by the system is to choose pump head another important performance data, generally with 5%-10% cushion amplification after head to selection.
   3. Liquid properties, including the liquid medium name, physical properties, chemical properties and other properties, physical properties have temperature c density d, viscosity u, medium of solid particles diameter and gas content and so on, this involves the basis of system, effective cavitation residue calculation and appropriate the type of pump: chemical properties, mainly refers to the chemical corrosive liquid medium and toxic, it is to choose material and choose the pump a shaft seal type of important basis.
   4. The device system pipeline layout condition refers to send liquid highly liquid distance to send to liquid, suck as side minimum liquid surface, the highest liquid surface from some data and piping specifications and its length, the material, the pipe specifications, quantity, etc, in order to carry on the system calculation and head of NPSH respectively.
   5. The content of the operating conditions are a lot, such as liquid operation T saturated steam force P, inhaled the lateral pressure PS (absolutely), releasing the pressure vessel PZ side, altitude, temperature operation is clearance or continuous, the position of the pump is fixed or can move.

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