What are the connection methods of plastic-coated steel pipes

First, the installation steps of plastic-coated composite spiral steel pipes used in water supply projects:

1. When choosing a suitable pipeline, you must first ensure that the selected plastic-coated composite spiral steel pipe meets the requirements of relevant standards and has good corrosion resistance and service life. Pipes of appropriate specifications and sizes should be selected according to project needs.

2. Preparation work Before installation, the pipeline needs to be inspected to ensure that there are no obvious defects or damage on the surface of the pipeline. Clean the pipe surface to remove debris and dust and keep it clean.

3. Arrange pipelines. Determine the direction and location of pipelines based on design requirements and actual conditions. After determining the location, carry out pre-embedding work and foundation construction to ensure the safety and stability of the pipeline.

4. Connect pipe fittings. According to the actual situation, select the appropriate pipe fitting connection method to connect the pipes. The connection should be sealed and there should be no leakage.

5. Fix the pipeline. After the pipeline installation is completed, fixing and supporting work must be carried out to ensure that the pipeline will not shift or tilt during use. The fixing method should comply with relevant specification requirements.

6. Pressure test After the installation is completed, the pressure test of the pipeline needs to be carried out to ensure that the sealing and pressure resistance of the pipeline meet the requirements. Stress testing should be conducted by relevant standards and specifications.

Second, anti-corrosion materials for plastic-coated composite spiral steel pipes for water supply:

1. Epoxy resin coating: Epoxy resin is a common anti-corrosion coating with excellent corrosion resistance and weather resistance, which can effectively extend the service life of steel pipes. Epoxy resin coatings can also improve the wear resistance and chemical corrosion resistance of pipelines and are suitable for water supply systems under various environmental conditions.

2. Polyethylene coating: Polyethylene is a material with excellent insulation properties and corrosion resistance. It is often used in anti-corrosion coatings for water supply systems. The polyethylene coating can not only effectively isolate the erosion of oxygen and moisture, but also reduce the surface roughness of the steel pipe, reduce the deposition of suspended matter, and extend the life of the pipe.

3. Coal tar pitch coating: Coal tar pitch is a traditional anti-corrosion coating with good chemical resistance and corrosion resistance. Coal tar pitch coating can effectively prevent rust and corrosion on the surface of steel pipes, and is suitable for underground pipes and buried pipes in water supply systems.

Third, the anti-aging properties of plastic-coated composite spiral steel pipes for water supply:

The anti-aging performance of plastic-coated composite spiral steel pipes for water supply is mainly related to the material and production process of its inner and outer coatings.

1. The choice of internal and external coatings directly affects the weather resistance and anti-aging properties of the pipe. Generally speaking, materials such as polyethylene and epoxy coal pitch have good weather resistance and anti-aging properties, and can effectively resist the erosion of sunlight, ultraviolet rays, weathering, and other factors.

2. The bonding force between the inner and outer coatings will also affect the anti-aging performance of the pipe. By adopting advanced internal and external plastic coating technology, a strong bonding force can be ensured between the coating and the pipe, thereby improving the anti-aging performance of the pipe.

Fourth, evaluation indicators of the anti-aging performance of plastic-coated composite spiral steel pipes for water supply

1. Weather resistance: Weather resistance refers to the ability of pipes to undergo performance changes when exposed to the natural environment (such as sunlight, ultraviolet rays, weathering, etc.) for a long time. Commonly used evaluation indicators include oxidation rate, carbonization rate, and elongation at break. For water supply plastic-coated composite spiral steel pipes, their weather resistance should meet national standards.

2. Anti-UV performance: Ultraviolet radiation will cause the surface of the pipe to age and reduce its service life. Anti-UV performance refers to the ability of a pipe to maintain its original performance under ultraviolet irradiation. Commonly used evaluation indicators include light transmittance and ultraviolet radiation blocking coefficient. For plastic-coated composite spiral steel pipes for water supply, their UV resistance should meet national standards.

3. Anti-aging performance: Anti-aging performance refers to whether the pipe can maintain its original performance during long-term use. Commonly used evaluation indicators include flexural strength, tensile strength, and cracking elongation.

Fifth, the structural characteristics of plastic-coated composite spiral steel pipe:

Plastic-coated composite spiral steel pipe is a steel pipe that forms a uniform and dense plastic anti-corrosion layer on the surface of ordinary steel pipes through a hot-dip plastic process. Its main structural features include the use of straight seam welding technology to ensure the dimensional accuracy of the steel pipe and the quality of the welds; both the inner and outer coatings are made of hot-dip epoxy resin paint, which has good adhesion and corrosion resistance; the surface is smooth and Not easy to scale, reducing fluid resistance and energy loss.