First, the advantages of internal and external plastic-coated steel pipes for water supply and drainage
1. Strong anti-corrosion performance: The internal and external plastic-coated steel pipes for water supply and drainage use polyethylene or epoxy resin as coating materials, which have good anti-corrosion properties and can effectively resist erosion by corrosive media such as acids, alkalis, and salts, and extend the service life of the pipeline.
2. Good pressure resistance: The internal and external plastic-coated steel pipes for water supply and drainage have high-pressure resistance and can withstand large water pressures. They are suitable for various water, drainage, gas, and other pipeline systems.
3. Good wear resistance: The surface of the internal and external plastic-coated steel pipes for water supply and drainage has been specially treated and has good wear resistance, which can reduce the wear of the inner wall of the pipe and extend the service life of the pipe.
4. Not easy to scale: The surface of the internal and external plastic-coated steel pipes for water supply and drainage is smooth and does not easily accumulate dirt, which can reduce the frequency of cleaning and maintenance and reduce maintenance costs.

Second, maintenance cost analysis of internal and external plastic-coated steel pipes for water supply and drainage
1. Labor costs: The daily maintenance of internal and external plastic-coated steel pipes for water supply and drainage mainly includes pipeline cleaning, leakage inspection, valve maintenance, etc. These tasks require professional technicians to operate, so labor costs are an important part of maintenance costs.
2. Material cost: The repair and replacement of internal and external plastic-coated steel pipes for water supply and drainage involve a certain amount of material consumption. For example, when a pipe leaks, damaged coatings or pipe components need to be replaced. In addition, pipelines need to be inspected regularly and repairs should be carried out promptly if problems are found to avoid more serious losses. Therefore, material costs are also an important part of maintenance expenses.
3. Cost of equipment and tools: The equipment and tools required to maintain internal and external plastic-coated steel pipes for water supply and drainage include testing instruments, maintenance tools, cleaning equipment, etc. The acquisition and maintenance costs of this equipment also need to be included in the maintenance costs.

Third, methods to reduce maintenance costs of internal and external plastic-coated steel pipes for water supply and drainage
1. Regular inspection and maintenance: By regularly inspecting and repairing the internal and external plastic-coated steel pipes for water supply and drainage, potential problems can be discovered in time, preventing small problems from turning into big ones, and thereby reducing maintenance costs.
2. Use high-performance coating materials: Choosing coating materials with good anti-corrosion, wear resistance, anti-scaling, and other properties can improve the durability of internal and external plastic-coated steel pipes for water supply and drainage, reduce the frequency of replacement and repair, and thus reduce maintenance costs.
3. Optimize the maintenance process: By optimizing the maintenance process of internal and external plastic-coated steel pipes for water supply and drainage, we can improve maintenance efficiency and reduce unnecessary manpower and material investment, thereby reducing maintenance costs.

Fourth, the pressure range of large-diameter plastic-coated steel pipes for water supply
Generally speaking, the pressure range of large-diameter plastic-coated steel pipes for water supply depends on the material and thickness of the pipe. In addition to the pipe material and thickness, factors such as the installation quality of the pipe and the surrounding environment also need to be considered. During the construction process, installation must be carried out in strict accordance with relevant standards and specifications to ensure the sealing and stability of the pipeline system. The pressure-bearing range of large-diameter plastic-coated steel pipes for water supply is a dynamic parameter that needs to be adjusted and confirmed according to specific conditions. During the engineering design and construction process, we should fully consider the pressure-bearing performance of the pipeline to ensure the safe operation and long-term stability of the system.

Fifth, can plastic-coated steel pipes for water supply resist chemical corrosion?
1. Manufacturing process of plastic-coated steel pipes: Plastic-coated steel pipes are treated with a special process on the surface of ordinary steel pipes and then coated with a layer of plastic coating to form a pipe with anti-corrosion, wear-resistant, temperature-resistant, and other characteristics. The manufacturing of plastic-coated steel pipes mainly includes the following steps: first, the steel pipe is heated to the appropriate temperature through the steel pipe production line; second, the plastic coating is evenly applied on the surface of the steel pipe by spraying or rotational molding; finally, the plastic-coated steel pipe is The final steel pipe is cooled and solidified to make it tightly integrated with the inner and outer walls.
2. Material characteristics of plastic-coated steel pipes: The main materials of plastic-coated steel pipes are steel pipes and plastics. Steel pipes have good mechanical properties and pressure-bearing capabilities and can withstand large internal and external pressures. Plastic coatings have excellent chemical stability, wear resistance, aging resistance, and flame retardancy, and can effectively protect steel pipes from erosion by external chemical media. In addition, plastic-coated steel pipes also have a certain degree of flexibility and can be easily bent and connected, making them suitable for various complex installation environments.
3. Application environment of plastic-coated steel pipes for water supply: Plastic-coated steel pipes for water supply are widely used in urban water supply, drainage, fire protection, air conditioning, and other fields. In water supply systems, since water quality may be affected by various chemicals, pipes are required to have good chemical stability.

Plastic-coated steel pipes are designed based on this demand. Its plastic coating can effectively isolate the corrosion of steel pipes from external chemical media, thereby ensuring the safe operation of the water supply system.