I. Advantages and characteristics of polyurethane directly buried insulation pipe Card stock, also called cover stock and pasteboard, is paper that is thicker and more durable than normal writing and printing paper, but thinner and more flexible than other forms of paperboard. Paper Card,Greeting Card,Happy Birthday Card,Paper Card Printed Logo Custom Shenyang Meitu Artical Printing Co.,Ltd , https://www.meituprintings.com
1, reduce the project cost.
According to calculations by related departments, dual-control heat supply pipes can generally be reduced by 25% of the construction cost (using FRP as a protective layer) and 10% (using high-density polyethylene as a protective layer).
2, low heat loss, energy conservation.
Its thermal conductivity is: λ = 0. 013 -0. 03kcal / m · h · oC, much lower than other commonly used pipe insulation materials, insulation effect increased by 4 ~ 9 times. In addition, its water absorption is very low, about 0.2 kg/m2. The reason for the low water absorption is that the closed cell ratio of the polyurethane foam is as high as about 92%. Low thermal conductivity and low water absorption, coupled with high density polyethylene or FRP shells with good thermal insulation properties and good external water-repellent properties, have changed the status of the traditional trench laying heating pipeline “wet cotton padded jacketsâ€, which greatly reduced the number of heating pipes. The overall heat loss, thermal network heat loss is 2%, less than the international standard requirements of 10%.
3, anti-corrosion, good insulation properties, long service life.
Because the polyurethane rigid foam insulation layer is tightly bonded to the steel pipe skin, it is inseparable from the infiltration of air and water, and can play a good anti-corrosion effect. At the same time, its foaming pores are closed and the water absorption is small. The high-density polyethylene shell and glass fiber reinforced plastic shell have good anti-corrosion, insulation and mechanical properties. Therefore, the outer skin of the working steel pipe is hardly affected by the outside air and water. As long as the internal water quality of the pipeline is well handled, according to the introduction of foreign materials, the service life can reach more than 50 years, which is 3 to 4 times longer than the traditional trench laying and overhead laying.
4. It occupies less land, is quick to construct and is conducive to environmental protection.
Directly buried heating pipes do not need to build huge trenches. They only need to insulate the underground heating pipes, which greatly reduces the project's land occupation, reduces earthwork excavation volume by more than 50%, and reduces civil engineering masonry and concrete volume by 90%. At the same time, the insulation pipe processing and the trenching in situ are carried out in parallel, and only the on-site joints can shorten the construction period by more than 50%.
5, security.
The polyurethane burial thermal insulation pipe is equipped with a leakage alarm line. Once a leak occurs in a certain place of the pipeline, the transmission line through the alarm line can show the exact position of the water leakage and the leakage of the thermal insulation pipe and the degree of leakage. In order to inform the infiltration personnel to quickly handle the leaked pipe section, to ensure the safe operation of the heating pipe network. The domestic production of thermal insulation pipe is currently equipped with a leakage alarm line, which is yet to be filled.
Second, the application of polyurethane insulation buried directly
Polyurethane directly buried insulation pipe is suitable for conveying insulation and cooling of various media in the range of -50°C-150°C. It is widely used in thermal insulation and cold preservation projects in cities such as central heating, warm rooms, cold storage, coal mines, oil ports, and chemical industries.
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