Advantages of Direct Laying of High-Temperature Prefabricated Direct-Buried Insulation Pipes:
1. **Cost Reduction in Construction** According to calculations by relevant authorities, the use of double-regulated heating pipelines can significantly cut down construction costs. When using FRP as a protective layer, the cost can be reduced by approximately 25%, and with high-density polyethylene, it's about 10%. This makes it a more economical choice for large-scale projects. 2. **Low Heat Loss and Energy Saving** High-temperature prefabricated direct-buried insulation pipes have an extremely low thermal conductivity, ranging from 0.013 to 0.03 kcal/m·h·°C, which is much lower than that of traditional insulation materials. This results in a thermal insulation effect that is 4 to 9 times better. Additionally, the water absorption rate is very low—around 0.2 kg/m²—due to the high closed-cell ratio (about 92%) of the polyurethane foam. Combined with the excellent insulation and waterproofing properties of the high-density polyethylene or FRP outer shell, this design eliminates the "wet cotton quilt" condition commonly seen in traditional trench-laid pipes. As a result, overall heat loss is greatly reduced, with network heat loss at only 2%, far below the international standard of 10%. 3. **Excellent Anti-Corrosion and Long Service Life** The polyurethane rigid foam insulation layer is tightly bonded to the steel pipe’s outer skin, preventing air and moisture penetration. The closed-cell structure further minimizes water absorption. Both the high-density polyethylene casing and FRP casing offer strong corrosion resistance, insulation, and mechanical strength. This ensures that the working steel pipe remains protected from external elements. With proper internal water treatment, these pipes can last over 50 years—three to four times longer than traditional trench or overhead installations. 4. **Less Land Use and Faster Construction** Direct-buried heating pipes eliminate the need for large trenches, reducing land usage and excavation volume by around 50%. Civil construction and concrete work are also reduced by up to 90%. Moreover, the processing of insulation pipes and on-site trenching can be done simultaneously, with only the joints needing attention on-site, which significantly shortens the construction period. Reduced transportation of materials like bricks, cement, and sand also leads to fewer emissions and less noise pollution, making this method more environmentally friendly. 5. **Enhanced Safety Features** Many high-temperature prefabricated direct-buried insulation pipes produced abroad come equipped with leak alarm lines. If a leak occurs, the system can detect the exact location and severity of the leak using a specialized instrument, allowing maintenance crews to respond quickly and ensure safe operation. In China, domestic insulation pipes typically include a similar leak detection system, though it may require filling during installation. Langfang Zhongyang Insulation Materials Co., Ltd.: http://
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