1. So that the selected pump type and performance in line with the device flow, head, pressure, temperature, cavitation flow, suction range and other process parameters.
2. Must meet the requirements of the characteristics of the medium:
(1) the pump conveying flammable, explosive, toxic or valuable media, the requirements of a reliable shaft seal or the use of non-leakage pumps, such as magnetic drive pumps, diaphragm pumps, shielded pumps; pumps conveying corrosive media, the requirements of convective components using corrosion-resistant materials, such as stainless steel corrosion-resistant pumps, engineering plastics, magnetic drive pumps.
(2) the pump conveying solid particles of media, the requirements of convective components using wear-resistant materials, if necessary, the shaft seal with the use of clean liquid flushing.
3. Mechanical reliability, low noise, low vibration.
4. Economy should be taken into account to the lowest total cost of equipment costs, operating costs, maintenance costs and management fees.
5. Acid and alkali resistant wastewater chemical pumps have high speed, small size, light weight, high efficiency, high flow rate, simple structure, pulsation-free infusion, smooth performance, easy to operate and convenient maintenance and so on.