1. It has strong corrosion resistance and waterproof ability and low comprehensive cost

According to the calculation of relevant departments, under normal circumstances, the double pipe heating pipeline can reduce 25% of the project cost (using glass fiber reinforced plastic as the protective layer) and

About 10% (HDPE is used as protective layer).

2. Anticorrosion, good insulation and long service life

The insulation pipe is tightly adhered to the outer skin of the steel pipe because of the rigid polyurethane foam insulation layer, which can prevent the infiltration of air and water.

Putrefaction. At the same time, its foam cells are closed, water absorption is very small. High density polyethylene (HDPE) and glass fiber reinforced plastic (FRP) shells have good protection

Corrosion, insulation and mechanical properties. Therefore, the outer skin of the working steel pipe is hard to be eroded by the outside air and water. As long as the water quality inside the pipeline is well treated

According to foreign data, the service life of high-temperature prefabricated directly buried insulation pipe can reach more than 50 years, which is better than that of traditional trench laying and overhead laying

The service life is 3 ~ 4 times longer.

3. Low heat loss and energy saving. The heat loss is only 25% of the traditional pipe material

The thermal conductivity of directly buried insulation pipe is 0.022kcal/m.h. ℃ and the hydrophobicity is 0.03kg/cm & sup3;

4. Less land occupation and faster construction is conducive to environmental protection

Directly buried heating pipeline does not need to build a huge trench, only need to bury the insulation pipe underground, so it greatly reduces the land occupation and earthwork

The excavation volume is more than 50%, and the amount of civil masonry and concrete is reduced by 90%. At the same time, the insulation pipe processing and field trenching are carried out in parallel

The joint can shorten the construction period by more than 50%.