1. Reduce the cost of construction.

According to the calculation of relevant departments, double-pipe heating pipeline can reduce the cost of construction by 25% (using FRP as maintenance layer) and 10% (using high density polyethylene as maintenance layer) under normal conditions.

2. Low heat loss and energy saving.

The thermal conductivity of directly buried heat preservation pipes is 0.013-0.03kcal/m.h.oC, which is much lower than other commonly used heat preservation data in the past, and the heat preservation effect is improved by 4-9 times. And its water absorption is very low, about 0.2 kg/m2. The reason for low water absorption is that the polyurethane foam has a closed porosity of about 92%. Low thermal conductivity and low water absorption, together with high density polyethylene (HDPE) or fiberglass reinforced plastics (FRP) maintenance shell with good insulation layer and external waterproofing performance, have changed the situation of traditional trench laying heating pipeline "wearing wet cotton jacket", greatly reducing the overall heat loss of heating pipeline, heat loss of heating network is 2%, less than the international standard requirements of 10%.

3. Anti-corrosion, good insulation performance and long service life.

The directly buried insulation pipe is tightly adhered to the outer skin of the steel pipe because of the rigid polyurethane foam insulation layer, which can isolate the infiltration of air and water, and can play a good anti-corrosive effect. At the same time, its foaming holes are closed and its water absorption is very small. High density polyethylene shell and FRP shell have good anti-corrosion, insulation and mechanical properties. Therefore, it is very difficult for the outer skin of the working steel pipe to be corroded by the outside air and water. According to foreign materials, the service life of directly buried insulation pipe can reach 50 years, which is 3-4 times longer than that of traditional trench laying and overhead laying.

4. It occupies less land, constructs quickly, maintains favorable environment and reduces construction disturbance to the people.

Directly buried heating pipelines do not need to build huge trenches. They only need to bury insulating pipes openly, 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%. At the same time, the processing of insulating pipes and digging ditches on site are stopped in parallel, only the on-site joints are needed, which can greatly shorten the construction period. Because the transportation of bricks, cement, sand and gravel, residual soil, etc. is reduced, the emission of automobile exhaust, dust and noise in the construction process are reduced, thus the environment is maintained.

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