What should be paid attention to when selecting corrosion-resistant pump? On the basis of grasping the basic data of pump selection, the key points of corrosion-resistant pump selection should pay attention to the following aspects:

(1) the process flow of the pump site. The corrosion pump should be based on the process of the necessary, reasonable determination of the pump flow and head and other fundamental parameters. Usually think of the normal wear and tear of the pump, the change in speed, may lead to lower head, so when selecting the pump pump head can have a margin of 2% ~ 5%. But the maximum can not exceed 10%, the fundamental principle is to ensure that the pump in the efficient range of operation. Other corrosion resistant pump through the process can be obtained pump inlet condition information for the calculation of equipment cavitation allowance.

(2) corrosive medium and data for chemical industry centrifugal pump selection. Because chemical media varieties complex, different in nature, the demand for accurate characteristic parameters, especially corrosive, concentration, volatility, vaporization pressure, viscosity, density, and so on, these properties and data selection is closely related, not only the metal data, but also to pay attention to the non-metallic data and media interaction.

(3) medium temperature. The temperature of the chemical pump structure selection has a serious impact, such as the pump body support method, cooling (or heat preservation) system planning, are closely related to the temperature of the transport medium.

(4) selection of spindle seal and its auxiliary system.

According to the practical case analysis, the main shaft sealing caused by the unit fault accounted for all the share of the fault is very high, some occasions can reach 30% ~ 40% more. So the selection of the main shaft seal is crucial. In addition to the physical and chemical properties of the medium, the pressure of the sealing chamber and the temperature of the medium inside the sealing chamber should be understood.