Fitted-pipe is a type of pipeline with a carbon steel pipe as the base, lined with a thermoplastic engineering plastic that has excellent chemical stability. It is formed through cold drawing and compounding or by molding, combining the mechanical properties of steel pipes with the corrosion resistance, slow scaling, and low microbial growth of engineering plastics, making it an ideal pipeline for transporting acidic, alkaline, saline, corrosive gases, and other media. Lined with food-grade polypropylene, it can be used in the food and drinking water industries. Common types of fitted-pipe include: steel-lined polypropylene pipe (GSF.PP), steel-lined polyvinyl chloride pipe (GSF.PVC), steel-lined polyethylene pipe (GSF.PE), steel-lined polyolefin pipe (GSF.PO), and steel-lined PTFE pipe (GSF.F4). Characteristics of fitted-pipe: 1. Excellent physical properties. 2. Good corrosion resistance. 3. Mechanical strength identical to steel pipes. 4. Sanitary and non-toxic, non-scaling, non-microbial, ensuring fluid quality. 5. Resistant to chemical corrosion, soil, and marine biological corrosion, and cathodic disbonding. 6. Mature and convenient installation process. 7. Good weather resistance, suitable for harsh environments such as deserts and saline soils. 8. Smooth pipe walls, improving transportation efficiency and extending service life.