Steel-clad steel fixed sections (reinforced fixation) utilize the high strength and good sealing properties of steel sleeve pipes, successfully addressing the difficulties of waterproofing and anti-leakage. The use of steel pipes as the outer protective layer features high strength, resistance to damage, and the ability to bear loads from above the sleeve. To achieve long lifespan, anti-corrosion treatment is required for the steel jacket pipes, ensuring the integrity of the heating pipeline. It can be widely applied in various temperature environments, particularly suitable for high-temperature steam pipeline projects. Sliding supports and internal fixations in steam pipelines are equipped with insulation measures using special materials to prevent the formation of thermal bridges, thus controlling the temperature of the external anti-corrosion layer. The fiber-wound reinforced glass steel outer protective pipe boasts excellent rigidity and waterproof properties, with superior corrosion resistance to adapt to various complex soil environments. Anti-corrosion of the outer steel pipe can be achieved through a combination of anti-corrosion coatings and cathodic protection, significantly extending the lifespan of the anti-corrosion. The condensate drainage system is in a fully enclosed form, with flexible layout, rational structure, and reliability. Insulation for the steel-clad steel thermal preservation pipeline joints must be carried out only after passing pressure tests, and on-site joint insulation work. This aspect is unique to the construction of pre-fabricated buried thermal preservation pipelines, where the quality of work directly impacts the service life. It is suitable for insulation and cooling projects transporting various media within the range of -50°C to 150°C. It is widely used in insulation and cooling projects in industries such as urban centralized heating, greenhouses, cold storage, coal mines, oil ports, and chemical industries. Polyurethane rigid foam insulation materials used in the construction industry are an important branch of the polyurethane industry, characterized by multifunctionality, including insulation and waterproofing functions. Since their application in the European construction industry since the 1960s, these products have a history of 40 years, and some countries have even legislated to use polyurethane as insulation and waterproofing materials in construction. In recent years, with the rapid development of China's building energy-saving market, polyurethane rigid foam thermal preservation products have been widely used in the field of building insulation and waterproofing and have become the leading market in thermal preservation.