1. Reduce project cost. According to the calculation of relevant departments, the double pipe heating pipeline can reduce the project cost by about 25% (using FRP as the protective layer) and 10% (using HDPE as the protective layer) in general.
2. Low heat loss and energy saving.
The thermal conductivity of prefabricated polyurethane direct buried insulation pipe is λ = 0.013-0.03kcal/m · h · OC, which is much lower than other commonly used pipeline insulation materials in the past, and the insulation effect is increased by 4-9 times. Moreover, its water absorption is very low, about 0.2kg/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 thermal insulation layer and high-density polyethylene or fiberglass protective shell with good waterproof performance, have changed the situation of "wet padded jacket" of traditional heat supply pipeline laid in trench, greatly reducing the overall heat loss of heat supply pipeline. The heat loss of heat supply network is 2%, which is less than the international 10% standard requirements.
3. Anticorrosion, good insulation and long service life.
The rigid polyurethane foam insulation layer is tightly bonded to the outer surface of the steel pipe, and the air and water infiltration can be isolated from the prefabricated polyurethane insulation pipe. At the same time, its foam pores are closed and its water absorption is very small. HDPE shell and FRP shell have good anticorrosion, 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 internal water quality of the pipeline is well treated, according to foreign data, the service life of the prefabricated polyurethane direct buried insulation pipe can be more than 50 years, 3-4 times longer than that of the traditional trench laying and overhead laying.
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