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) coating has become a popular choice 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 pipe from external damage but also significantly extends its service life. The anti-corrosion layer plays a critical role in determining the longevity of underground pipelines. Even with the same material, some pipes can remain intact for decades without showing 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 layer used. The 3PE anti-corrosion system typically consists of three layers: The 3PE coating offers a unique combination of protection. The bottom layer is an epoxy powder coating that adheres directly to the steel surface, providing strong adhesion and corrosion resistance. The middle layer is a copolymer adhesive with branched functional groups, which enhances the bonding between the inner and outer layers. The top layer is high-density polyethylene, offering excellent weathering and mechanical resistance. This innovative coating was developed by combining the European 2PE system with the widely used FBE coating from North America. It has been successfully applied globally for over a decade and is now considered a standard in the industry. The inspection process begins with a thorough check of the steel pipe to ensure it meets all necessary requirements for further processing into insulated pipes. This includes checking for corrosion, removing any imperfections, and ensuring the surface is clean and properly prepared. Once the steel pipe is ready, it is placed inside a polyethylene casing, and polyurethane foam is injected to fill the gap completely. After this, both the anti-corrosion pipes and the finished insulated pipes undergo final quality inspections before being packaged for shipment. Before applying the anti-corrosion coating, the base steel pipe is inspected and recorded as it enters the production platform. The outer surface is then subjected to shot blasting to remove rust and other contaminants. The cleanliness of the surface and the depth of the anchor pattern are carefully checked. If any issues are found, the surface is manually polished using a grinding wheel, and tape is applied to the ends. Dust is removed, and the pipe is heated to the required temperature. Then, the epoxy powder is sprayed, followed by the application of the adhesive and polyethylene layers. After curing, the coated pipes are cooled with water, marked, and prepared for stacking and shipping. 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 the 3PE Anti-Corrosion Coating
In practice, these three materials are combined and processed to form a strong bond with the steel pipe. This results in a durable and effective anti-corrosion layer. There are two main application methods: the winding type and the round mold wrapping type.
Advantages of 3PE Anti-Corrosion Steel Pipes
Inspection Process for 3PE Anti-Corrosion Pipes
Preparation of the Base Material for 3PE Coating