Plastic-coated steel pipe for water supply is a specialized water supply pipe made from ordinary carbon steel pipe, coated internally and externally with a corrosion-resistant plastic coating such as food-grade epoxy resin or polyethylene. While retaining the high strength and impact resistance of the steel pipe, the plastic coating isolates the steel from contact with the water. This addresses the issues of rust pollution from traditional steel pipes and the insufficient strength of plastic pipes, making it a preferred pipe for municipal water supply, residential water supply, and rural drinking water projects.

The core production process emphasizes "coating adhesion and hygiene and safety": The base steel pipe is first derusted, degreased, and phosphated to ensure a clean, rough surface and enhance coating adhesion. Then, using electrostatic spraying or hot-melt dipping, a food-grade plastic powder is evenly applied to the inner and outer surfaces of the steel pipe. Finally, it is cured at high temperature (180-220°C) to form a dense coating with a thickness of 0.3-1.0mm. The coating must pass hygiene and safety testing and comply with the requirements of the "Specifications for Safety Evaluation of Drinking Water Transmission and Distribution Equipment and Protective Materials." Compared to traditional water supply pipes, this type of pipe offers three core advantages: First, water quality is guaranteed. The inner plastic coating is smooth and dense, resistant to rust and scaling, preventing metal ion leaching and contamination, ensuring long-term water supply while maintaining acceptable quality. Second, it is corrosion-resistant and durable. The plastic coating resists chloride ions and microbial attack in water, and can withstand soil corrosion when buried underground. Its service life is 10-15 years longer than galvanized steel pipe, reaching 20-30 years. Third, it delivers efficient water transportation with low energy consumption. The smooth inner surface (roughness coefficient of only 0.008-0.01) reduces fluid resistance, reducing water supply energy consumption by 15%-20% compared to steel pipes of the same specification. It is also less prone to clogging, lowering operation and maintenance costs. In practical applications, it is the "main pipe" of municipal pipe networks, used in urban main road water pipelines to ensure stable water supply over a large area. It is also the "critical link" of residential water supply, ensuring drinking water safety from secondary water supply equipment to branch pipes in residents' homes. It is also a "reliable choice" for rural drinking water projects, adapting to complex rural soil environments, solving drinking water hygiene issues in remote areas, and building a solid water quality safety line for various water supply scenarios.