1. Reduce the project cost.

According to the calculation of relevant departments, the cost of double pipe heating pipeline can be reduced by 25% (with FRP as the protective layer) and 10% (with HDPE as the protective layer). Gamma

2. Small heat loss and energy saving.

Its thermal conductivity is: λ = 0.013 to 0.03kcal/m · h · C, which is much lower than other pipeline insulation materials used in the past, and improves the insulation effect by 4-9 times. Again, its water absorption is very low, about 0.2 kg / m2. The reason is that the share of obturator with low water absorption polyurethane foam is as high as 92%. Low water absorption and low thermal conductivity, together with the outer insulation layer and excellent waterproof high-density polyethylene or glass fiber protective shell, changed the traditional groove laying heating pipe "wet coat" situation, greatly reduced the total heat loss of heating pipe, the international level of thermal net 2% is less than 10% of heat loss.

3. Anticorrosion, good insulation and long service life.

Because the polyurethane rigid foam insulation layer is tightly combined with the outer layer of the steel pipe, the air and water penetration is isolated, and the polyurethane rigid foam insulation layer has excellent anticorrosive effect. Together, the foam holes are closed and the water absorption rate is small. High density polyethylene (HDPE) and glass fiber reinforced plastic (GFRP) have excellent corrosion resistance, insulation and mechanical properties. Therefore, the outer layer of working steel pipe is difficult to be eroded by external air and water. As long as the internal water quality of the pipeline is excellent, the service life can reach more than 50 years, and the service life of overhead laying is 3-4 times of that of traditional ditches.

4. Small floor area, fast construction speed and environmental protection.

Directly buried heat supply pipeline does not need to build a huge trench, only need to bury insulation pipe underground, which greatly reduces the construction area, reduces the amount of earthwork excavation by more than 50%, and reduces the amount of civil masonry and concrete by 90%. The construction period can be shortened by more than 50% as long as the field joints are made. Gamma

5. Safety.

The polyurethane directly buried insulation pipe is equipped with leakage alarm line to inform the leakage personnel to deal with the leakage pipe section quickly, so as to ensure the safe operation of the heating pipe network.