3PE anti-corrosion steel pipes are typically made from three main types of steel pipes: seamless, spiral, and straight-seam. The three-layer polyethylene (3PE) anti-corrosion coating has become a widely adopted solution in the oil and gas industry due to its excellent resistance to corrosion, water vapor permeability, and mechanical strength. This makes it ideal for protecting underground pipelines from environmental degradation over long periods. The anti-corrosion layer is crucial for the longevity of buried pipelines. Even with identical materials, some pipes can last for decades without showing signs of corrosion, while others may fail within just a few years. The difference often lies in the quality and type of the outer anti-corrosion coating used. The 3PE anti-corrosion system consists of three distinct layers: The 3PE coating offers several benefits. The bottom layer is an epoxy powder coating that adheres directly to the steel surface. The middle layer is a copolymer adhesive with branched functional groups, providing strong adhesion. The top layer is a high-density polyethylene coating that acts as a protective shield against external damage. This innovative coating combines the best features of European 2PE and North American FBE systems, making it a globally recognized solution for pipeline protection over the past decade. The inspection process begins by checking the steel pipe to ensure it meets the necessary conditions for further processing. This includes checking for corrosion, removing any foreign objects, and ensuring the surface is clean. Once the pipe is prepared, it is placed inside a polyethylene casing for pipe formation. After the ends are repaired, polyurethane foam is injected to fill all gaps completely. Finally, both the anti-corrosion pipes and the finished thermal insulation pipes undergo thorough inspection before being packaged for shipping. Before applying the anti-corrosion coating, the steel pipe must be inspected and recorded upon entering the production platform. The outer surface is then subjected to shot blasting to remove rust and debris. The cleanliness of the surface and the depth of the anchor pattern are checked to ensure they meet the required standards. If not, manual grinding with a grinding wheel is performed to correct any imperfections. A tape is wrapped around the pipe ends, dust is removed, and the pipe is heated to the appropriate temperature using intermediate frequency heating. Then, the epoxy powder is sprayed, followed by the application of the adhesive and polyethylene layers through extrusion. After the coating is applied, the pipes are cooled with water. Qualified products are marked and prepared for stacking and shipment. Silicon Carbide Endless Wire Cutting Machine Silicon Carbide Endless Wire Cutting Machine,Carbide Cutting Wire Machine,Silicon Carbide Wire Saw Machine,Silicon Carbide Cutting Wire Machine Changzhou Kuaile Technology Co., Ltd , https://www.quartzglasssectionmachine.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 together, forming a strong bond with the steel pipe. This results in a highly effective anti-corrosion barrier. There are two common application methods: winding type and round mold wrapping type.
Advantages of 3PE Anti-Corrosion Steel Pipes
Inspection Process of 3PE Anti-Corrosion Pipes
Preparation and Quality Control Before Anti-Corrosion Treatment
3PE reinforced anti-corrosion steel pipe