Advantages of direct laying of high temperature prefabricated direct buried insulation pipe:
1. Reduce project cost
According to the calculation of the relevant departments, the double-regulated heating pipeline can generally reduce the construction cost by 25% (using FRP as a protective layer) and 10% (using high-density polyethylene as a protective layer).
2. Low heat loss, saving energy
The high-temperature prefabricated direct-buried insulation pipe has a thermal conductivity of λ=0.013—0.03kcal/m·h·oC, which is much lower than other commonly used pipe insulation materials, and the thermal insulation effect is improved by 4 to 9 times. Further, its water absorption rate is very low, about 0.2 kg/m2. The reason for the low water absorption rate is that the closed cell ratio of the polyurethane foam is as high as about 92%. The low thermal conductivity and low water absorption, plus the high-density polyethylene or FRP protective shell with good insulation and outer waterproofing, change the condition of the traditional ditch laying heating pipe “wet cotton quiltingâ€, greatly reducing the heating pipe. The overall heat loss, heat network heat loss is 2%, less than the international standard of 10%.
3. Anti-corrosion, good insulation performance and long service life
The high-temperature prefabricated direct-buried insulation pipe has a good anti-corrosion effect because the polyurethane rigid foam insulation layer is tightly bonded to the outer skin of the steel pipe to insulate the penetration of air and water. At the same time, its foaming holes are closed and the water absorption is small. The high-density polyethylene casing and the FRP casing have good corrosion resistance, insulation and mechanical properties. Therefore, the outer skin of the working steel pipe is hardly 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 high temperature prefabricated direct buried thermal insulation pipe can reach more than 50 years, which is 3-4 times higher than that of the traditional trench installation and overhead laying.
4. Less land occupation, faster construction, environmental protection and less construction disturbance
The direct buried heating pipeline does not need to build a huge trench. It only needs to bury the thermal insulation pipe underground, thus greatly reducing the project land occupation, reducing the excavation volume of the earth by about 50%, and reducing the civil construction and concrete volume by 90%. At the same time, the insulation pipe processing and the on-site trenching are carried out in parallel, and only the on-site joints can greatly shorten the construction period. Since the transportation of bricks, cement, sand and gravel, and other soils is reduced, the vehicle exhaust emissions, dust emission, and noise emissions during the construction process are reduced, thereby protecting the environment.
5. Security
In addition to the high-temperature prefabricated direct-buried insulation pipes produced outside China, there are leak alarm lines. Once the pipeline leaks somewhere, the transmission of the alarm line can show the accurate leakage of water and water leakage on the special inspection instrument. The location and the degree of leakage, in order to inform the inspecting personnel to quickly deal with the leaking pipe section to ensure the safe operation of the heating pipe network. The domestically produced insulation pipe is currently equipped with a leak alarm line, which needs to be filled.
Langfang Zhongyang Insulation Materials Co., Ltd.: http://
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