1. Meet the requirements

     The performance of the selected pump should meet the process design requirements.

     2. Choose the pump simpler

     The pump with a simple structure is preferred. Because the simple structure of the pump is compared with the complex structure, the former has high reliability,

     Advantages such as convenient maintenance and low total cost in the life cycle. For example: single-stage pumps and multi-stage pumps, vane pumps and reciprocating pumps.

     3. Optimal centrifugal pump

     The centrifugal pump has the characteristics of high speed, small size, light weight, simple structure, no pulsation of infusion, stable performance, easy operation and convenient maintenance. Therefore, in addition to the following conditions, centrifugal pumps should be used as much as possible:

     (1) When there are metering requirements, use metering pumps;

     (2) For small flow and high head, choose vortex pump and reciprocating pump;

     (3) When the flow rate (pressure) is not pulsating, the vortex pump is selected when the flow rate is high and the head is small;

     (4) For large flow and low head, choose axial flow pump or mixed flow pump;

     (5) When the medium contains 75% air, the flow is small and the viscosity is less than 37.4mm2/s, the vortex pump is used;

(6) When the medium viscosity is large (greater than 650~1000mm2/s), use rotor pumps and reciprocating pumps (gear pumps, screw pumps);

     (7) For occasions with frequent startup or inconvenient pumping, use pumps with self-priming performance, such as self-priming centrifugal pumps, self-priming vortex pumps, and diaphragm pumps;

     (8) When there are special needs, choose other pumps, such as jet pumps, hose pumps, etc.

     4. Special requirements

     For pumps installed in explosive areas or special occasions, explosion-proof motors or other effective measures should be adopted according to the level of the explosive area.