First, the material characteristics of large-diameter internal and external plastic-coated steel pipes:

1. Plastic coating: The inner and outer layers of large-diameter internal and external plastic-coated steel pipes are protected by plastic coatings. This kind of coating has good corrosion resistance and wear resistance, which can effectively prevent the inside of the pipeline from being corroded by chemicals and microorganisms and extend the service life of the pipeline.

2. Steel matrix: The matrix of large-diameter internal and external plastic-coated steel pipes is made of steel and has high strength and compression resistance. This makes the steel pipe less likely to deform when under pressure, thereby ensuring the safety and stability of the pipeline.

Second, factors affecting the service life of large-diameter internal and external plastic-coated steel pipes

1. Material selection: The material selection of large-diameter internal and external plastic-coated steel pipes has a great impact on its service life. Generally speaking, better quality steel has a longer service life. Therefore, when choosing plastic-coated steel pipes, you should try to choose products made of steel.

2. Usage environment: The usage environment of large-diameter internal and external plastic-coated steel pipes will also affect its service life. For example, temperature, humidity, PH value, and other factors will have a certain impact on pipelines. During the design and use process, these factors should be fully considered to ensure the normal operation of the pipeline.

3. Maintenance: Large-diameter internal and external plastic-coated steel pipes require regular maintenance during use. For example, measures such as cleaning and anti-corrosion treatment can effectively extend the service life of pipelines. Therefore, during use, the maintenance of pipelines should be strengthened.

Third, the service life of large-diameter internal and external plastic-coated steel pipes

It is predicted that based on current technology and experience, the service life of large-diameter internal and external plastic-coated steel pipes can usually reach more than 50 years. Of course, the specific service life needs to be determined based on actual usage conditions and maintenance status. How much pressure can large-diameter internal and external plastic-coated steel pipes withstand:

1. The pressure-bearing capacity of large-diameter internal and external plastic-coated steel pipes depends on the quality of the material and the design of the pipe. Generally speaking, large-diameter internal and external plastic-coated steel pipes have a higher pressure-bearing capacity and can withstand greater pressure. However, in actual projects, we need to select appropriate pipelines based on the specific use environment and engineering requirements.

2. The pressure-bearing capacity of large-diameter internal and external plastic-coated steel pipes is also affected by the installation and use process. During the installation process, it is necessary to ensure that the pipe connections are firm and the sealing is good to prevent problems such as water leakage. During use, it is necessary to regularly check the operation of the pipeline and perform timely maintenance and upkeep.

3. The pressure of large-diameter internal and external plastic-coated steel pipes is also related to the diameter and wall thickness of the pipe. Generally speaking, pipes with larger diameters and thicker walls will withstand greater pressures.

Fourth, the advantages of large-diameter internal and external plastic-coated steel pipes:

1. Strong corrosion resistance. The internal and external plastic-coated steel pipes of caliber use epoxy resin and polyethylene as coating materials, which have strong corrosion resistance. This kind of pipeline material can withstand the erosion of chemicals such as acids, alkalis, and salts, and is suitable for environments that transport corrosive media.

2. Good wear resistance. The inner wall of the large-diameter internal and external plastic-coated steel pipe has high smoothness and a small friction coefficient, so it has good wear resistance. This allows large-diameter internal and external plastic-coated steel pipes to reduce pipeline wear and extend the service life of the pipeline when transporting abrasive media.

3. High compressive strength Large-diameter internal and external plastic-coated steel pipes have high compressive strength and can withstand greater pressure. This enables it to ensure the safe and stable operation of the pipeline when transporting high-pressure media.

4. Low thermal resistance coefficient. Large-diameter internal and external plastic-coated steel pipes have a low thermal resistance coefficient and good thermal insulation performance. This allows it to effectively reduce heat loss and energy consumption when transporting high-temperature media.

5. Easy installation and simple maintenance. Large-diameter internal and external plastic-coated steel pipes are light in weight, high in strength, corrosion-resistant, and not prone to scaling, making them very convenient to install and maintain. In addition, because its surface coating can prevent the growth and attachment of bacteria, it also has broad application prospects in hospitals, laboratories, and other places.

Fifth, application fields of large-diameter internal and external plastic-coated steel pipes

1. Chemical industry: Large-diameter internal and external plastic-coated steel pipes can be used to transport corrosive, abrasive, high-temperature, and other media, such as acids, alkalis, salts, petroleum, chemical raw materials, etc.

2. Construction industry: Large-diameter internal and external plastic-coated steel pipes can be used to transport hot and cold water, air conditioning water, fire water, and other media, and are widely used in building water supply and drainage systems.

3. Natural gas industry: Large-diameter internal and external plastic-coated steel pipes can be used to transport flammable and explosive media such as natural gas and have good safety performance.

4. Pharmaceutical industry: Large-diameter internal and external plastic-coated steel pipes can be used to transport pharmaceutical intermediates, drugs, and other media to ensure safe and pollution-free transmission of drugs.

5. Environmental protection industry: Large-diameter internal and external plastic-coated steel pipes can be used in sewage discharge, wastewater treatment, and other fields to effectively prevent pollutants from harming the environment.