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Summary of the knowledge of steel-lined plastic pipes
Steel-lined plastic pipes are known by various names in different industrial settings and market environments, such as plastic-lined pipes, lined steel pipes, steel-plastic composite pipes, or simply steel and plastic pipes. Despite the different terminology, their manufacturing process and overall performance remain largely similar. These pipes typically consist of a carbon steel pipe as the base material, with a thermoplastic inner layer that offers excellent chemical resistance. The plastic lining is applied through cold drawing or rotational molding, combining the mechanical strength of steel with the corrosion resistance and low scaling tendency of plastic, as well as its resistance to microbial growth.
One of the key considerations in pipe design is determining the appropriate wall thickness based on the specific application requirements. This factor directly influences the cost-effectiveness and performance of the final product. Steel-lined plastic pipes are particularly well-suited for transporting aggressive media such as acids, alkalis, salts, and corrosive gases. They are constructed using a solid steel casing with an integral plastic lining formed through rotomolding. This eliminates the need for plastic welding, which helps overcome limitations seen in materials like polypropylene (PP), resulting in a more durable and reliable product.
These pipes can withstand high temperatures and pressures while minimizing issues caused by differences in thermal expansion between the steel and plastic layers. As a result, they are widely used in chemical plants for anti-corrosion and acid-resistant piping systems, as well as in power plants for water, demineralized water, and wastewater treatment projects. Their long service life and superior performance make them a preferred choice over traditional piping solutions.
In terms of production design, steel-lined plastic pipes offer versatility and reliability, making them suitable for a wide range of applications. Choosing high-quality steel-lined plastic pipes ensures the efficiency and smooth operation of industrial processes. Whether in chemical processing, power generation, or environmental engineering, these pipes provide a durable and cost-effective solution that meets modern industry demands.