1. Under the condition of not affecting the welding of the nozzle, the reserved length of the epoxy powder at the end of the polyethylene layer should be appropriately increased to prevent the 3PE anti-corrosion coating steel pipe warping caused by the long stacking time of the steel pipe and the serious metal corrosion of the pipe end.

2. When 3PE anti-corrosion coating steel pipes are stacked in the open air for a long time, they should be covered at the pipe ends to prevent rainwater from corroding and causing serious corrosion of the pipe ends.

3. If the pipeline construction period is long, weldable anti-rust paint can be painted on the bare metal of the pipe end to prevent the 3PE anti-corrosion coating layer from warping due to corrosion during storage.

4. Strictly control the grinding quality of the welding seam reserved at the pipe end. The outsides of the polyethylene groove at the weld are the same as the other parts of the pipe body. Keep the epoxy powder longer than 20mm to prevent the bottom of the epoxy powder at the weld from being corroded first and causing the 3PE anti-corrosion coating layer of warp.

Attention should be paid to the grinding of pipe end welds

1. From the beginning of the welding seam grinding to the polyethylene chamfer, there should be a flat section of the polyethylene layer of 10-20mm with no excess weld height and the same as the pipe body to ensure the extrusion and bonding of the polyethylene groove at the pipe end quality.

2. The reinforcement of the weld seam after grinding should be as flush as possible with the pipe body, and there should be no obvious reinforcement to prevent the epoxy powder from being polished off when grinding the chamfer of the polyethylene layer.

3. The chamfer of the undressed top of the weld and the transition section of the repaired place should also be the same as the chamfer of the polyethylene layer (≤30°) so that the squeezing force of the squeeze roller can evenly press the polyethylene layer To prevent the polyethylene layer from curling due to poor adhesion of the anti-corrosive layer at the groove.

4. The epoxy powder coating of the reserved section can delay the edge warping caused by corrosion only when the protection is complete. Domestic pipe end polyethylene bevel processing is done by steel wire wheel grinding, which will damage the epoxy powder coating. The bevel should be machined instead, and the bottom layer of the knife edge should be limited by a device to control the cutting depth of the tool, so as not to damage the epoxy powder coating.

Steel pipes are widely used in various industries, and their protection against corrosion is crucial to ensure their durability. One of the most effective ways to prevent corrosion is by applying a 3PE anti-corrosion coating on the exterior surface of the pipe. However, despite its benefits, this type of coating can be prone to warping at the ends, which can compromise its protective properties. In this blog post, we will explore the causes of 3PE anti-corrosion coating steel pipe end warping and provide practical solutions to avoid it. By following these measures, you can ensure that your steel pipes remain protected and operational for longer periods without any damage or defects caused by warping.

Causes of pipe end warping

There are several reasons why 3PE anti-corrosion coating steel pipe ends may warp. One of the most common causes is uneven heating during welding. When the temperature of one side of the pipe end rises more quickly than the other, it can cause warping.

Another potential cause is improper handling or storage before installation. If pipes are stacked or stored in a way that puts pressure on the ends, they can become misshapen and difficult to fit correctly.

In some cases, inadequate preparation of the surface prior to application of the anti-corrosion coating can also lead to warping. If there are any bumps, dents or irregularities in the surface, these imperfections can be magnified once coated and contribute to deformation.

Poor quality control during manufacturing processes such as cutting and bending could also result in warped pipe ends. It's essential for manufacturers to maintain strict standards when producing 3PE anti-corrosion coating steel pipes to avoid issues with warping down-the-line.

By understanding these potential causes, professionals working with 3PE anti-corrosion coating steel pipes will be better equipped to take steps necessary for preventing unwanted distortion at their job sites

Solutions to avoid pipe end warping

Pipe end warping is a common issue that occurs in 3PE anti-corrosion coating steel pipes. However, there are several solutions that can help you avoid this problem.

Firstly, it's important to ensure that the pipe ends are properly prepared before welding. This includes cleaning and sanding the surfaces to remove any rust or debris. Additionally, the use of low-hydrogen electrodes during welding can help reduce warping.

Secondly, controlling heat input during welding is crucial for avoiding pipe end warping. This can be achieved by using preheating methods such as induction heating or using fixtures and clamps to hold the pipes in place during welding.

Thirdly, post-weld heat treatment (PWHT) can also prevent pipe end warping. PWHT involves heating the welded area of the pipeline to a specific temperature and holding it for a set amount of time to relieve any residual stresses.

Choosing high-quality materials with uniform thicknesses and proper specifications can also prevent pipe end warping. It's essential to work with reliable suppliers who follow industry standards when selecting materials for your project.

By following these solutions carefully, you can avoid pipe end warping issues and ensure that your 3PE anti-corrosion coating steel pipes last longer without damage caused by corrosion or other environmental factors.

Conclusion

In summary, preventing warping of 3PE anti-corrosion coating steel pipe ends is crucial to ensuring the longevity and effectiveness of the piping system. To achieve this goal, various measures can be taken such as proper welding techniques, controlling heat input during welding, using appropriate backing rings or filling materials and avoiding over-pressurization of the pipes.

By implementing these solutions in a systematic manner, any potential issues with pipe end warping can easily be avoided. Ultimately, taking preventive measures will save time and money by minimizing repairs and maintenance costs while increasing overall operational efficiency.

Therefore, it is highly recommended to incorporate these strategies into your operations when working with 3PE anti-corrosion coating steel pipes. Doing so will guarantee that you have a reliable pipeline infrastructure that operates effectively for many years to come.

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