3PE coating steel pipe is a pipeline material with excellent anti-corrosion performance, which is widely used in petroleum, natural gas, chemical industry, water conservancy, and other fields. In the process of use, the connection method is a crucial part, not only related to the safety and stability of the pipeline but also affects the service life and maintenance cost of the pipeline. This article will discuss the connection methods of 3PE coating steel pipe, introduce common connection methods, advantages and disadvantages, and scope of application, in order to provide reference and reference for readers.

Common connection:

1. Solder connection

Welding connection is one of the most commonly used connection methods for 3PE coating steel pipe, mainly including butt welding, fillet welding, and flange welding. Butt welding is welding after aligning the ends of two pipes, which is suitable for the connection of straight pipes and elbows; fillet welding is welding after the ends of two pipes are butted at a 90-degree angle, and is suitable for turning The connection; flange welding is to connect the end of the pipe to the flange and then weld it, which is suitable for the connection of parts that need to be disassembled. Welding connection has the advantages of firm connection, good sealing, and corrosion resistance, but it requires professional welding technology and equipment, and thermal stress will be generated during the welding process, which may easily lead to deformation and cracks in the pipeline.

2. Thread connection

The threaded connection is to process the end of the pipe into a threaded shape, and the connection is realized by the mutual engagement of the threads. The threaded connection is suitable for small-diameter pipes and low-pressure pipes. It has the advantages of convenient connection, convenient disassembly, and strong adaptability, but its sealing performance is poor and it is easy to be loosened by external forces.

3. Tube card connection

The pipe clip connection is to insert the end of the pipe into the pipe clip and realize the connection by tightening the bolts. The pipe clip connection is suitable for large-diameter pipes and high-pressure pipes. It has the advantages of convenient connection, easy disassembly, and good sealing performance. However, it is necessary to select appropriate pipe clips and bolts and pay attention to the tightening force of the bolts during the installation process.

4. Cap connection

The pipe cap connection is to process the end of the pipe into a circle and realize the connection by inserting it into the pipe cap and fixing it with bolts. The pipe cap connection is suitable for small-diameter pipes and low-pressure pipes. It has the advantages of convenient connection, easy disassembly, and good sealing performance. However, it is necessary to select appropriate pipe caps and bolts and pay attention to the tightening force of the bolts during installation.

5. Mechanical connection

This method involves joining pipes together using mechanical fittings such as couplings or clamps. Mechanical connections are preferred where pipes need to be joined quickly and easily without the need for welding. However, it must be ensured that mechanical fittings are compatible with the 3PE coating and that the coating will not be damaged during installation.

No matter which connection method you use, you need to pay attention to the following:

1. The preparation work of the pipeline should be done well, including the cleaning, painting, and anti-corrosion treatment of the pipeline.

2. The selection of connecting parts should be appropriate, including pipe fittings, flanges, bolts, gaskets, etc.

3. Pay attention to safety during the connection process to avoid accidents.

4. After the connection is completed, check to ensure that the connection is firm and the seal is good.

5. The use and maintenance of the pipeline should be carried out in accordance with the regulations, and the connection parts of the pipeline should be checked and maintained regularly.

The connection method of 3PE coating steel pipe is an important link in pipeline engineering. Different connection methods have their own advantages and disadvantages. It is necessary to choose the appropriate connection method according to the specific situation. Through reasonable connection methods and maintenance measures, the safety, stability, and service life of the steel pipe can be guaranteed, providing a guarantee for the smooth progress of the project.

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