1. Aluminum alloy lined plastic composite pipe: 1. The outer pipe is made of aluminum alloy, and the inner pipe is made of thermoplastic pipe, forming a two-layer structure pipe through prestress composite - aluminum alloy lined plastic composite pipe. The working pressure is not more than 2.5 MPa, and the nominal diameter does not exceed dn160 for indoor (indoor and outdoor of buildings) water supply transportation aluminum alloy lined plastic composite pipes and fittings; 2. The overall use (design) coefficient C of aluminum alloy lined plastic composite pipes is ≥1.5. The outer layer aluminum alloy pipe of the aluminum alloy lined plastic composite pipe is 6063 alloy modified aluminum, seamlessly extruded (the inner and outer surfaces of the aluminum alloy pipe are treated by anodizing process, with a surface coating of over 10um, refer to CJ/T321-2010); 3. The "plastic" in aluminum alloy lined plastic composite pipe is made of food-grade thermoplastic (PPR, PERT, PB) extruded into plastic round pipes of S4 grade, in short, "aluminum alloy lined plastic pipe." 2. Structure of aluminum alloy lined plastic composite pipe: From the literal meaning of "aluminum alloy lined plastic composite pipe," the main and secondary components are distinct, with the aluminum alloy pipe as the main part and the plastic pipe as the auxiliary part, forming a new type of pipe with the main characteristic of "lightweight rigidity" - aluminum alloy lined plastic composite pipe has the advantages of hygiene, corrosion resistance, low thermal conductivity, and good transport performance of PERT, PPR, and PB plastic pipes; meanwhile, due to the external aluminum alloy protective layer, it overcomes the shortcomings of low surface hardness, poor rigidity, large linear expansion coefficient, poor ultraviolet resistance, and easy aging of plastic pipes, thus integrating the advantages of aluminum alloy metal pipes, such as high hardness, good strength, impact resistance, and beautiful appearance. 4. The process of aluminum alloy lined plastic composite pipe: "Lined" is the main feature of the production process, which organically combines seamless aluminum alloy pipe and plastic pipe through prestress technology, achieving excellent interlayer bonding strength. 5. Characteristics of aluminum alloy lined PPR pipe: 1. Health and Environmental Protection Aluminum alloy lined plastic composite pipe has strong UV resistance and oxygen blocking properties, is opaque, non-toxic, antibacterial, and uses food-grade water-contact raw materials that are healthy and environmentally friendly. The medium is smoothly transported without scaling, with a low friction resistance coefficient of only 0.007. 2. Lightweight and Rigid Structure Safety Aluminum alloy lined plastic composite pipe is a lightweight rigid pipeline, with unique socket fittings connection that has obtained a national utility model patent. It has strong corrosion resistance, anti-oxygen and anti-aging properties, and the inner lining S4 thermoplastic pipe ensures the pipeline system's medium transport under a nominal pressure of PN2.5 MPa with normal use and maintenance-free operation for 50 years. 3. Excellent Quality Runshuo is a pipe enterprise with 7 years of export experience and enjoys a high reputation in the industry; its aluminum alloy lined PPR pipe products are exported to Europe, the Middle East, Asia, and Africa, with processes adhering to European and American standards, ensuring reliable product quality. 4. Wide Range of Applications Suitable for heating systems in various buildings in the north, large central air conditioning supply and return water pipeline systems, national defense projects, various buildings' hot and cold water supply systems, high-rise buildings, hotels, hospitals, schools... Suitable for various food enterprises, drinking water, beverage filling lines, and pharmaceutical preparation pipelines.