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Product definition: It is made by spirally winding and welding (extrusion welding at the overlapping surfaces) of steel-plastic composite profiled strips, with specifications ranging from DN200 to DN3000 mm, and its inner wall is smooth and flat. This type of pipe boasts advantages such as corrosion resistance, light weight, easy installation, high flow capacity, and a long service life of 50 years. It can replace pipes made from materials with high energy consumption, making it an environmentally friendly green product. Basic characteristics: 1. Light weight, safe and easy to use, good sealing performance, and low construction costs. 2. Safe and reliable ring stiffness: Since the ratio of the elastic moduli of steel and plastic is greater than 200, and the weight ratio is greater than 7.85, steel strip reinforcement enables pipes – especially those with large diameters – to possess sufficient safe and reliable ring stiffness as well as a relatively high stiffness-to-weight ratio compared to pure plastic pipes. 3. Strong resistance to abnormal sudden loads: Thanks to its high ring stiffness and good axial flexibility, when there is uneven soil settlement, groundwater rise, excessive local loads on the ground, or sudden loads and disasters such as earthquakes, the pipe can absorb the resulting stresses through elastic deformation, thereby preventing leaks or damage at the pipe joints due to excessive stress and deformation. 4. Smooth inner surface: The smooth inner surface of the pipe minimizes energy losses due to friction, and deposition is less likely to occur within the pipe. The flow resistance of polyethylene (PE) pipes is 20–30% lower than that of cement pipes. The inner walls of PE pipes are smooth, resulting in a low friction coefficient, and sediment hardly accumulates within these pipes. 5. Corrosion-resistant, wear-resistant, and long-lasting: The corrosion resistance of polyethylene pipes allows them to be used for transporting corrosive liquids such as acids and alkalis, and they can be installed in corrosive environments such as swamps and humid areas. 6. High-density polyethylene (PE) pipes can have a service life of up to fifty years. 7. Flexibility, leak-free, impact-resistant: The good flexibility of polyethylene pipes allows them to be easily laid along the terrain of pipe trenches, to bypass obstacles encountered during installation, and to adapt to soil settlement in marshy areas and regions with soft soil. 8. Leak-free connections (electrofusion welding, butt welding): Both of these sealing methods offer excellent sealing performance and environmental benefits. They can be carried out manually using simple tools, without the need for machinery, making them very simple and fast. Reliable leak-free connection methods include: 1. Stainless steel clamp elastic connection; 2. Electrothermal fusion tape connection