Corrosion-resistant centrifugal pump how to choose type

According to statistics, wet corrosion is one of the biggest headaches for users of the chemical industry. It is slightly careless, and damages equipments at worst, causing accidents and even causing disasters. According to the statistics of Boao Technology, about 60% of the destruction of chemical equipment is caused by corrosion. Therefore, the scientificity of material selection must be taken into consideration when selecting corrosion-resistant pumps. There is usually a misunderstanding that stainless steel is a “universal material” and it is dangerous to hold a stainless steel centrifugal pump regardless of media and environmental conditions. The following points for some commonly used chemical media to talk about the selection of corrosion-resistant centrifugal pump selection:

1. Sulfuric acid media As one of the strong corrosive media, sulphuric acid is a very widely used important industrial raw material. Different concentrations and temperatures of sulfuric acid on the corrosion of the material is quite different, for the concentration of more than 80%, the temperature is less than 80 °C concentrated sulfuric acid, carbon steel and cast iron have good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid, Not suitable for pump valve material; common stainless steels such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) also have limited use for sulfuric acid media.

2. Hydrochloric acid media Most metal materials are not resistant to hydrochloric acid corrosion (including various stainless steel materials), molybdenum-containing high-ferrosilicon can only be used for 50 °C, 30% or less hydrochloric acid. Contrary to metal materials, most non-metallic materials have good corrosion resistance to hydrochloric acid, so lining rubber pumps and plastic pumps (such as engineering plastics, fluorine plastics, etc.) are the best choice for delivering hydrochloric acid. Boao company's applicable products are: fluorine plastic chemical pump series can be.

3. Nitric acid General metals are rapidly corroded and destroyed in nitric acid. Stainless steel corrosion-resistant centrifugal pumps are the most widely used nitric acid-resistant centrifugal pumps. They have good corrosion resistance to all concentrations of nitric acid at room temperature. It is worth mentioning that The corrosion resistance of molybdenum stainless steel (such as 316, 316L) to nitric acid is not only better than ordinary stainless steel (such as 304, 321), and sometimes even worse. For high temperature nitric acid, fluoroplastic alloy materials are usually used. Bo Hao Company's applicable products include: IHF-type fluorine plastic chemical pump, FSB-type fluorine plastic centrifugal pump, IGF-type fluorine-lined pipeline pump, PF-type corrosion-resistant centrifugal pump, CQB-F-type fluorine plastic magnetic pump.

4. Acetic acid It is one of the most corrosive substances in organic acids. Common steel is severely corroded in all concentrations and temperatures of acetic acid. Stainless steel is an excellent acetic acid resistant material. Molybdenum-containing 316 stainless steel is also suitable for high temperatures and Dilute acetic acid steam. For high temperature and high concentration of acetic acid or other corrosive media and other demanding requirements, high alloy stainless steel magnetic pumps or fluorine plastic chemical pumps such as CQB type stainless steel magnetic pump, CQ type magnetic drive pump, stainless steel pipeline centrifugal pump, and stainless steel chemical pump can be used.