3PE anti-corrosion steel pipes are typically made from different types of steel pipes, including seamless, spiral, and straight-seam steel pipes. The three-layer polyethylene (3PE) anti-corrosion coating is widely used in the oil and gas industry due to its excellent corrosion resistance, low water vapor permeability, and strong mechanical properties. This coating not only protects the steel pipe from external damage but also significantly extends its service life. The anti-corrosion layer is a critical component that determines the long-term performance of buried pipelines. Even pipes made from the same material can have vastly different lifespans—some may last for decades without any signs of corrosion, while others may develop leaks within just a few years. This difference is largely due to the quality and type of the outer anti-corrosion coating applied. The 3PE anti-corrosion system consists of three main layers: The 3PE coating is known for its excellent adhesion and durability. The bottom layer is an epoxy powder coating that adheres directly to the steel surface, providing a strong foundation. The middle layer is a copolymer adhesive with branched functional groups, which ensures good bonding between the layers. The top layer is a high-density polyethylene coating that offers outstanding protection against environmental factors such as moisture and mechanical stress. The inspection process begins with a thorough check of the steel pipe before applying the anti-corrosion coating. The pipe must meet specific conditions to ensure it is suitable for thermal insulation applications. This includes checking for corrosion, removing any rust or debris, and ensuring the surface is clean and properly prepared. Before applying the anti-corrosion coating, the base material must be inspected and recorded. The outer surface of the steel pipe is then subjected to shot blasting to remove rust and contaminants. The cleanliness of the surface and the depth of the anchor pattern are carefully checked. If they do not meet the required standards, the surface is manually polished using a grinding wheel. Afterward, tape paper is wrapped around the pipe ends, and dust is removed. The pipe is then heated to the required temperature, followed by the application of epoxy powder, adhesive, and polyethylene. Once the coating is complete, the pipe is cooled using water, and qualified products are marked and prepared for stacking and shipping. Sugar Beet Handling Gravel Pump Shijiazhuang Zhongjia Slurry Pump Co.,Ltd. , https://www.zhongjiapump.com
Material Analysis of 3PE Anti-Corrosion Steel Pipes
Introduction to the Anti-Corrosion Layer of 3PE Pipes
Structure of 3PE Anti-Corrosion Coating
In practice, these three materials are combined during the manufacturing process and firmly bonded to the steel pipe surface, creating a strong, durable, and effective protective layer. There are two common application methods: winding type and round mold wrapping type.
Advantages of 3PE Anti-Corrosion Steel Pipes
3PE anti-corrosion steel pipes are the result of combining the European 2PE coating with the North American FBE (Epoxy Powder) coating. This innovative design has been widely adopted globally for over a decade and is now considered one of the most reliable anti-corrosion solutions in the industry.
Inspection Process for 3PE Anti-Corrosion Pipes
Next, the treated steel pipe is placed into a polyethylene casing for forming. After the ends are repaired, polyurethane foam is injected to fill all gaps completely. Finally, the finished product undergoes a comprehensive inspection to ensure it meets quality standards before being shipped out.
Pre-Treatment and Coating Process