Working principle and advantages of insulated steel pipes
Release time:
2025-09-17
Moreover, with a design life of up to 50 years, through anti-corrosion systems such as three-layer PE cold-applied tape sealing, it can effectively prevent groundwater infiltration, ensuring long-term stable operation of the pipeline. Application.
Insulated steel pipes are mainly composed of a working steel pipe layer, an insulation layer, and an outer protective layer. The working steel pipe layer typically adopts materials such as seamless steel pipes and spiral welded pipes. Its surface undergoes shot blasting and rust removal treatment, and is coated with an epoxy resin anti-corrosion coating, used for directly transporting high-temperature steam, petroleum, chemical media, etc. The insulation layer can be made of various materials.
Taking polyurethane foam as an example, it has a rigid closed-cell structure, with a density generally ranging from 60 to 80kg/m³ and a low thermal conductivity of 0.033W/(m·K). Its applicable temperature range is -185℃ to 150℃ (even up to 180℃ after modification), and it is tightly combined with the steel pipe through high-pressure foaming process. The outer protective layer commonly uses high-density polyethylene (HDPE) or galvanized iron sheet, with a thickness of not less than 2.5mm, playing an important role in waterproofing, soil corrosion resistance, and mechanical impact resistance.
Insulated steel pipes have a low heat loss rate, generally ≤2%, thanks to the reasonable combination of aluminum foil reflective layer and inorganic insulation layer, achieving thermal insulation effect. At the same time, they also possess high mechanical strength, capable of withstanding a soil load of 80kN/m², with an impact resistance of 50J/cm². When directly buried, no concrete support is required, greatly saving construction costs and space. Moreover, with a design life of up to 50 years, through anti-corrosion systems such as three-layer PE cold-applied tape sealing, it can effectively prevent groundwater infiltration, ensuring long-term stable operation of the pipeline. Application.
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