Views:5 Author:Site Editor Publish Time: 2019-06-19 Origin:Site
1. Note that the type and function of the selected pump meet the requirements of process parameters such as equipment flow, head, pressure, temperature, cavitation flow, and suction stroke.
2. It is necessary to satisfy the requirements of the media characteristics.
For pumps that transport flammable, explosive, toxic or valuable media, it is required to secure the shaft seal or use a non-leakage pump, such as a magnetic drive pump, a diaphragm pump, and a shield pump;
For pumps carrying corrosive media, corrosion resistance data are required for convection components, such as AFB stainless steel corrosion resistant pumps, CQF engineering plastic magnetic drive pumps; for pumps containing solid particulate media, convective components are required to use wear resistant materials, if necessary The shaft seal is flushed with a cleaning liquid.
3. High mechanical reliability, low noise and small oscillation.
4. The economic consideration should be based on the lower 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 function, easy operation and convenient maintenance.
1. When there is a measurement requirement, the metering pump is selected.
2, the head requirements are very high, the flow is very small and there is no suitable small flow high-lift centrifugal pump can be used, optional reciprocating pump, such as cavitation requirements 2, not high can also choose vortex pump.
3, the head is very low, when the flow is very large, the axial flow pump and the mixed flow pump can be selected.
4. 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)
When the medium contains 75% gas, the flow rate is small and the viscosity is less than 37.4mm2/s, a vortex pump can be selected.
5. For occasions with frequent start-up or inconvenient pumping, pumps with self-priming function, such as self-priming centrifugal pump, self-priming vortex pump and pneumatic (electric) diaphragm pump, should be used.
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