1. Make the type and performance of the selected pump meet the requirements of process parameters such as flow, lift, pressure, temperature and suction.
2, must meet the requirements of the media characteristics.
For pumps that transport flammable, explosive, toxic or valuable media, it is required to use shaft seals reliably or use non-leakage pumps, such as magnetic drive pumps, diaphragm pumps, and shield pumps for pumps that transport corrosive media. Corrosion-resistant materials are required for convection components. Such as AFB stainless steel corrosion-resistant pump, CQF engineering plastic magnetic drive pump.
For pumps containing solid particulate media, it is required that the convection component be made of wear-resistant material, and if necessary, the shaft seal should be flushed with a cleaning liquid.
3. High mechanical reliability, low noise and low vibration.
4. The economic consideration should be based on the lowest total cost of equipment, operating, maintenance and management fees.
5. The centrifugal pump has the characteristics of high speed, small volume, light weight, high efficiency, large flow, simple structure, no pulsation of infusion, stable performance, easy operation and convenient maintenance. Therefore, in addition to the following conditions, the centrifugal pump should be used as much as possible:
When there is a measurement requirement, the metering pump has a high head requirement, and the flow rate is small. If there is no suitable small flow and high lift centrifugal pump, the reciprocating pump can be used. If the cavitation requirement is not high, the vortex pump can also be used.
When the lift is very low, the axial flow pump and the mixed flow pump can be selected when the flow rate is large.
When the viscosity of the medium is large (more than 650~1000mm2/s), consider the choice of rotor pump or reciprocating pump (gear pump, screw pump). The medium gas content is 75%, the flow rate is small and the viscosity is less than 37.4mm2/s. Vortex pump.
v For frequent start-up or inconvenient pumping, pumps with self-priming performance, such as self-priming centrifugal pumps, self-priming vortex pumps, pneumatic (electric) diaphragm pumps.
Post time: Nov-11-2019