Steel jacketed steel steam insulation steel pipe high temperature heating heat aluminum silicate prefabricated direct buried insulation steel pipe

Steel jacket steel prefabricated direct buried insulation pipe fittings are key components used in high-temperature steam transmission, central heating and other systems, using factory prefabrication and on-site direct burial installation methods, with the characteristics of efficient thermal insulation, corrosion resistance and long life. The following is its core information: 1. Main structure and type Internal sliding type Structure: working steel pipe + aluminum silicate layer + drag damping layer + microporous calcium silicate insulation layer + stainless steel fastening belt + aluminum foil reflective layer + polyurethane insulation layer + jacket steel pipe 2. Features: The working steel pipe moves synchronously with the insulation layer, and the outer guard pipe is fixed, which is suitable for steam pipelines with a temperature ≤ 300°C 7 Outer sliding structure: working steel pipe + high-temperature glass wool insulation layer + air layer + jacket steel pipe 7. Features: Insulated and drained through air layers, suitable for large diameter (DN200 and above) pipes4. 2. Key parameters and standards Design pressure: ≤1.6MPa, design temperature ≤300°C4 Insulation materials: rock wool, aluminum silicate or polyurethane foam, thermal conductivity ≤0.033W/(m·K)612 Implementation standard: CJ/T 246-2018 "Annex to Urban Heating Prefabricated Direct Buried Steam Insulation Pipe and Pipeline" 4. 3. Typical application scenarios Municipal heating pipe networks, industrial steam transmission (such as power plants and chemical plants)13. In areas with high groundwater levels, the anti-corrosion layer of the outer steel pipe is relied on to achieve waterproof and leak-proof10. 4. Installation precautions Welding requirements: The working steel pipe is primed with argon arc welding, and the weld seam needs to be 100% ray detection15. Patching treatment: DN≤500mm is used to patch the sleeve, DN>500mm is used to patch 16 with electric heating and melting sleeve. Backfill specifications: Compact fine sand in layers to avoid damage to the insulation layer 16.