How do we choose pumps?

    A pump selection principle

1 , so that the selected pump type and performance in line with unit flow, head, pressure, temperature , cavitation flow , suction process parameters such requirements.

2, the mechanical aspects of high reliability, low noise, small vibration

3 , the economy and comprehensive consideration to the equipment costs , operating costs, maintenance costs and management fees the lowest total cost .

4 , centrifugal pump with a high speed , small size , light weight , high efficiency , large flow , simple structure, no pulse infusion , stable performance , easy operation and convenient maintenance .

     Therefore, the following exceptions should be used wherever 

possible centrifugal pumps :

     There measurement requirements , the selection of metering pumps

     Head demanding, flow is very small and not suitable for low flow high head pumps can be used , the choice of reciprocating pump , such as less demanding when cavitation vortex pump can also be used .

     Head low, traffic is heavy , the choice of axial and mixed flow pumps.

     Medium viscosity ( greater than 650 ~ 1000mm2 / s) , can be considered optional rotor pump or reciprocating pump ( gear pump , screw pump )

     Medium containing 75% of gas , flow is small and the viscosity of less than 37. 4mm2 / s , the choice of vortex pump .

     Start priming the pump for frequent or inconvenient occasions , should be used with self- priming pump , such as self- priming centrifugal pumps , self-priming vortex pump , pneumatic diaphragm pumps, electric diaphragm .

    Second, the pump selection basis

     Pump selection basis , should be based on process , drainage requirements, from five aspects to be considered , not only the amount of liquid delivery 。