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Chemical Pump To Transport Acid And Alkali To Determine The Material

Released on Jul. 25, 2018

The API610 Chemical Pump operates in many complicated working conditions. The most prominent problem is the corrosion resistance of the chemical pump. In the face of various complicated working conditions, the chemical pump must be used to communicate with the Vertical Long Shaft Pump Supplier in a timely and comprehensive manner. Commonly used chemical media, do a brief introduction to the selection of chemical pumps, convenient for users to choose:

1. Sulfuric acid As one of the strong corrosive media, sulfuric acid is an important industrial raw material with a wide range of uses. Different concentrations and temperatures of sulfuric acid have a great difference in corrosion of materials. For concentrated sulfuric acid with a concentration above 80% and temperature less than 80 °C, carbon steel and cast iron have good corrosion resistance, but it is not suitable for high-speed flowing sulfuric acid. It is not suitable as a material for pump valves; ordinary stainless steels such as 304 (0Cr18Ni9) and 316 (0Cr18Ni12Mo2Ti) are also limited in their use for sulfuric acid media. Therefore, the pump valve for conveying sulfuric acid is usually made of high-silicon cast iron (difficult to cast and process) and high-alloy stainless steel (20 alloy). Fluoroplastics have better sulfuric acid resistance, and a fluorine-lined pump (F46) is a more economical option.

2. Hydrochloric acid Most metal materials are not resistant to hydrochloric acid corrosion (including various stainless steel materials), and molybdenum-containing high silicon iron can only be used for hydrochloric acid at 50 ° C and 30%. Contrary to metal materials, most non-metallic materials have good corrosion resistance to hydrochloric acid, so rubber pumps and plastic pumps (such as polypropylene, fluoroplastics, etc.) are the best choice for transporting hydrochloric acid.

3. Nitric acid is generally destroyed by rapid corrosion in nitric acid. Stainless steel is the most widely used nitric acid-resistant material. It has good corrosion resistance to all concentrations of nitric acid at normal temperature. It is worth mentioning that it contains molybdenum-containing stainless steel (such as 316, 316L) corrosion resistance to nitric acid is not only better than ordinary stainless steel (such as 304, 321), and sometimes even worse. For high temperature nitric acid, titanium and titanium alloy materials are usually used.

4. Acetic acid It is one of the most corrosive substances in organic acids. Ordinary steel is severely corroded in acetic acid of all concentrations and temperatures. Stainless steel is an excellent acetic acid resistant material. Molybdenum-containing 316 stainless steel can also be used for high temperature and Dilute acetic acid vapor. For high temperature, high concentration acetic acid or other corrosive media, high alloy stainless steel pumps or fluoroplastic pumps are available.

5, alkali (sodium hydroxide) steel is widely used in sodium hydroxide solution below 80 ° C, 30% concentration, there are many factories still use ordinary steel at 100 ° C, below 75%, although the corrosion is increased, but the economy is good . The corrosion resistance of ordinary stainless steel to lye has no obvious advantages compared with cast iron. Stainless steel is not recommended as long as a small amount of iron is allowed in the medium. For high-temperature alkaline liquids, titanium and titanium alloys or high-alloy stainless steels are often used.

API610 Chemical Pump

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