1. So that the type and performance of the selected pump in line with the flow rate, lift, pressure, temperature, flow, suction and other process parameters of the requirements.
2. Mechanical aspects of high reliability, low noise, small vibration
3. The economy should take into account the cost of equipment, operation, maintenance and management costs the lowest total cost.
4. Self suction centrifugal pump with high speed, small size, light weight, high efficiency, high flow rate, simple structure, no pulsation of the infusion, stable performance, easy operation and convenient maintenance, etc..
Therefore, in addition to the following circumstances, should be selected as far as possible from the suction centrifugal pump:
When there are measurement requirements, the use of metering pump
Lift requirements are very high, flow is very small and no suitable small flow high lift self suction centrifugal pump can be selected, can choose reciprocating pump, such as cavitation requirements are not high, but also can use the vortex pump.
The head is very low, the flow is very large, can choose the axial flow pump and mixed flow pump.
Medium viscosity larger (greater than 650~1000mm2/s), can be considered to select the rotor pump or reciprocating pump (gear pump, screw pump)
Medium gas content 75%, the flow is small and the viscosity is less than 37. 4mm2/s, can use the vortex pump.
The frequent starting or irrigation pump disadvantageous situations should be selected with the self suction performance of pump, such as self suction self-priming centrifugal pump, automatic suction vortex pump, gas and electric diaphragm pump.
