First, what are plastic-coated steel pipes?
Plastic-coated steel pipes, also known as plastic-coated pipes, steel-plastic composite pipes, or plastic-coated composite steel pipes, are steel-plastic composite pipes with a steel pipe base. A layer of plastic anti-corrosion coating is fused to the inner surface of the steel pipe through spraying, rolling, dipping, or suction processes, or to both the inner and outer surfaces. Plastic-coated steel pipes have excellent corrosion resistance and relatively low frictional resistance. Epoxy resin-coated steel pipes are suitable for conveying media such as water supply and drainage, seawater, warm water, oil, and gas. Polyvinyl chloride (PVC)-coated steel pipes are suitable for conveying media such as drainage, seawater, oil, and gas.

Second, what are the characteristics of plastic-coated steel pipes?
1. Hygienic and non-toxic, it does not accumulate scale, does not breed microorganisms, and ensures fluid quality.
2. Resistant to chemical corrosion, soil and marine organism corrosion, and cathodic disbondment.
3. Mature, convenient, and quick installation process.
4. Good weather resistance, suitable for harsh environments such as deserts and saline-alkali land.
5. Smooth pipe wall, improved conveying efficiency, and long service life.

Third, advantages and disadvantages of plastic-coated steel pipes for water supply:
Advantages: Plastic-coated steel pipes for water supply possess the strength, ease of connection, and resistance to water flow impact of steel pipes, while overcoming the disadvantages of steel pipes, such as susceptibility to corrosion, pollution, and scaling when exposed to water, and the low strength and poor fire resistance of plastic pipes.
Disadvantages: Bending, hot processing, and electric welding/cutting are prohibited during installation. When cutting, the cut surfaces should be coated with the non-toxic, room-temperature curing adhesive provided by the manufacturer.

Fourth, Epoxy Resin Coated Steel Pipe Connection Methods:
Threaded connection: DN15-DN100;
Grooved connection: DN65-DN400;
Bimetallic welded connection: DN100-DN800;
Flange connection: Applicable to any diameter.
Welded connection: Applicable to any diameter;

Fi.th, Application Scope of Double-Sided Plastic Coated Steel Pipes:
1. Fire sprinkler systems, domestic water supply, and drainage;
2. Gas extraction, slurry transportation, and ventilation systems in coal mines;
3. Chemical corrosion-resistant pipelines, suitable for underground burial and transporting corrosive media such as acids and alkalis, with no reduction in pipeline lifespan;
4. Protection of communication cables, widely used in cable renovation projects in urban and rural areas;
5. Central air conditioning and HVAC circulating water systems: Using this pipeline ensures the normal operation of the central air conditioning water circulation system.