Selection Guide for Chemical Pumps: Matching Materials, Environment, and Performance

Selection Guide for Chemical Pumps

In the field of chemical engineering, pump selection is crucial as it directly affects production efficiency and safety.

However, many people often overlook the importance of media and environmental conditions when choosing pumps, blindly selecting pump materials.

According to relevant statistics, about 60% of the damage to chemical equipment is caused by corrosion. Therefore, below are some key points for selecting materials for chemical pumps for commonly used chemical media:

1. Sulfuric acid: The key to corrosion resistance lies in material selection

For concentrated sulfuric acid with a concentration of over 80% and a temperature below 80 ℃, carbon steel and cast iron have good corrosion resistance, but they are not suitable for high-speed flowing sulfuric acid and are not suitable as materials for pumps and valves; Ordinary stainless steels such as 304 and 316 also have limited applications for sulfuric acid media.

Therefore, pumps and valves for transporting sulfuric acid are usually made of high silicon cast iron (difficult to cast and process) and high alloy stainless steel (alloy 20). Fluoroplastics have good sulfuric acid resistance, and using a fluorine-lined pump (F46) is a more economical choice.

2.Hydrochloric acid: Advantages of non-metallic materials

Most metal materials, including stainless steel, do not have good corrosion resistance to hydrochloric acid.

Therefore, non-metallic materials such as lined rubber pumps and plastic pumps (such as polypropylene, fluoroplastics, etc.) have become better choices when transporting hydrochloric acid.