As the main component of carbon steel pipe is iron, this element is easy to combine with water and oxygen in the air to produce iron oxide (rust). The material will be transported to the cylinder and production equipment with compressed air, which will cause cylinder wear and equipment damage and bring unnecessary losses to the user. If the gas source comes into direct contact with the product, it will lead to a decrease in quality, and if it is a food product, the impact will be even more severe. Even if measures such as filtering triplets are used, rust is a solid impurity that can easily adsorb onto the filter material, resulting in a short service life and pressure drop.