**Steel-Plastic Composite Pipe Installation and Construction Guide** Before starting the installation of steel-plastic composite pipes, ensure that all technical documents, including construction drawings and specifications, are complete. A thorough technical briefing should be conducted to confirm all requirements. Check the product certifications, quality assurance certificates, and verify the model, variety, and quantity of fittings, valves, pipe supports, fasteners, and seals. Perform a visual inspection to ensure all components meet the required standards. The construction site must be ready with proper water and power supply, and all necessary equipment should be on-site. Ensure that any connected devices or systems are properly fixed or positioned before proceeding. All personnel involved in the installation should be trained in the correct handling and installation techniques of steel-plastic composite pipes. They should be familiar with the properties of the material and have the necessary skills for proper installation. For steel-plastic composite pipes, specific tools should be used: - Cutting: Use a metal saw, not a grinding wheel. - Threading: Use an automatic threading machine. - Grooving: Use a special grooving machine. - Bending: Cold-bend using a bender, ensuring the radius is at least 8 times the pipe diameter. When installing indoor buried pipes, they should be installed before the underground floor construction is completed. The pipe should extend at least 500mm beyond the external wall, and the opening should be sealed promptly. Avoid burying the pipe in reinforced concrete structural layers. Pipes crossing floors, roofs, or water tanks should have预留 holes or pre-embedded casings. The hole size should be 40mm larger than the pipe’s outer diameter. When embedded in walls, the groove width should be 30mm larger than the pipe’s outer diameter, and the slope should match the pipe's slope. For pipes with a diameter of 50mm or less, cold bending is allowed, but the bending radius should not be less than 8 times the diameter, and the bending angle should not exceed 100 degrees. After completing hidden work, fill the embedded pipes immediately to prevent damage. For threaded connections, use a dedicated threading machine, lubricate it, and ensure conical threads meet national standards. Clean the pipe ends thoroughly and apply anti-corrosion and sealing materials. Avoid using non-lined malleable cast iron fittings. Flange connections should follow national standards for convex flanges and necked flanges. Ensure the pressure rating matches the system. Flange installations can be done in one or two stages depending on the project’s complexity. During acceptance, conduct hydraulic pressure tests as per standard procedures. After testing, drain and clean the system, especially if it carries drinking water. All documentation, including design changes, material certificates, and test records, should be available for review. Steel-plastic composite pipes offer high strength, corrosion resistance, and hygiene compliance. They are ideal for hot and cold water systems, fire protection, HVAC, and chemical applications. For PPR pipes, use hot-melt welding with precise temperature control. Follow step-by-step procedures for cutting, heating, and connecting. After installation, perform a pressure test to ensure no leaks. This guide provides essential information for safe and effective steel-plastic composite pipe installation. Always refer to local codes and standards for compliance. For more details, visit [www.chinawj.com.cn](http://www.chinawj.com.cn).

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