Design Institute equipment in the design, to determine the pump usage and performance parameters and select the pump. This choice must first start from the choice of corrosion-resistant chemical pump type and form, then what principle to choose the pump? What is the basis? 1, so that the selected corrosion-resistant pump type and performance in line with the device flow, head, pressure, temperature, NPSH, suction and other process parameters 2, must meet the requirements of the characteristics of the media Conveying flammable, explosive poisonous Or noble medium pumps require reliable shaft seals or leak-free pumps such as magnetically driven pumps (shaftless seals with indirect magnetically driven indirect drive) For pumps that deliver aggressive media, convection components are required to be made of corrosion-resistant materials such as Fluoroplastic anti-corrosion pump on the pump containing solid particulate media, convection parts require wear-resistant materials, if necessary, the shaft seal with a cleaning liquid rinse. 3, the mechanical requirements of high reliability, low noise, small vibration. 4, Correct calculation of corrosion pump purchase cost of investment.