Introduction to Polyurethane Composite Pipes

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I. Performance Features: Polyurethane composite pipes are made by using steel pipes as the base material, and then coating them with a polyurethane material that offers high wear resistance, high elasticity, and excellent corrosion resistance; this coating is applied through a special manufacturing process. Polyurethane composite pipes possess excellent comprehensive properties such as wear resistance, acid and alkali resistance, scale prevention, radiation resistance, resistance to hydrolytic aging, high elasticity, and resistance to mechanical impact. 1. Good wear resistance: Thanks to the good elasticity of the polyurethane lining, when subjected to impacts from the fluid, the polyurethane is compressed under external forces; once these forces cease, it returns to its original shape. This mechanism of using flexibility to counteract hardness reduces wear caused by the direct and intense scouring of the pipeline’s inner wall by the fluid, and its wear resistance lifespan is dozens of times that of steel pipes. 2. Scale prevention: Polyurethane elastomers have a symmetrical molecular structure and are non-polar, which prevents them from adsorbing ions such as Ca2+, CO2-, HCO3-, and OH- present in the slurry, thus preventing the formation of scale layers. Moreover, it has a smooth inner surface and good elasticity, which prevents the attachment of scale layers; thus, it exhibits excellent scale prevention and inhibition properties. 3. Low operating resistance: The lining surface is smooth and transparent, with an absolute roughness of 0.082 on the inner wall, which helps to reduce operating costs. 4. It has good water resistance and excellent aging resistance; it does not swell in water like rubber products, which would affect its performance. 5. Good adhesion: The sprayed polyurethane bonds tightly to the steel pipe; thanks to a unique manufacturing process, the polyurethane elastomer achieves 100% adhesion to the steel pipe, offering excellent strength against detachment, delamination, or local tearing. 6. Light weight and easy installation: Since the body tubes are made of thin-walled tubes, the weight is relatively low. For installation, connection methods such as flange connection, flexible pipe joint connection, and welding can be used. II. Applications: Polyurethane composite steel pipes possess excellent comprehensive properties such as wear resistance, acid resistance, alkali resistance, scale prevention, radiation resistance, resistance to hydrolytic aging, high elasticity, and resistance to mechanical impact. It can be widely used in industries such as electricity, coal, mining, building materials, and chemicals to transport abrasive granular materials and corrosive fluids such as coal powder, ash, mineral powder, molten aluminum, and slurry. Power industry: For the ash removal pipes, slag pipes, and ash water recovery pipes in thermal power plants, polyurethane composite steel pipes exhibit superior performance in systems for transporting fresh water, seawater used for ash removal, and acidic media in power plants. Coal industry: Dense-medium coal washing plants and long-distance coal conveying pipeline systems. Sediment backfilling in coal mining. Mining industry: iron ore slurry, mine concentrate, tailings conveying systems, closed-loop pipelines for mine flotation systems, and water and sediment conveyance in gold mining. Building materials and chemical industries: It proves to be highly effective in the conveyance of coke particles in steel mills, aluminum in aluminum plants, and coal powder in cement plants. It is also suitable for transporting solids and liquids that are corrosive—such as acids, alkalis, and salts—as well as pipelines used in oil extraction, silt removal projects, urban water supply systems, and pipes for transporting molten aluminum. III. Installation and Usage Instructions 1. The end face of the spraying flange must not be crushed or scratched; if any damage is present, it must be repaired before installation. 2. During installation, gas cutting or welding on the pipe itself is strictly prohibited. Polyurethane composite pipes are manufactured using automated processes, which ensures the long-term stability of their physical and chemical properties as well as their service life. The production process involves high-speed rotation for one-time molding, resulting in pipes without layers or seams and with a smoothly smooth inner surface like a mirror. It completely solves the problems associated with traditional products, such as numerous weld points at the installation joints, misalignment of the internal diameter during installation, lack of impact resistance, tendency to break, peeling, bulging, seam joints in the wear-resistant layer (which causes excessive vortex-induced stress in the pipelines), and poor corrosion resistance.