Directly-buried prefabricated insulation pipes have outstanding advantages and applications compared to traditional insulation pipes of various types:
1. Reduce project cost.  　　
According to calculations by related departments, dual-control heat supply pipes can generally be reduced by about 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 and energy saving.  　　
Its thermal conductivity is: λ = 0 . 013—0 . 03kcal / m?h?oC , much lower than other commonly used pipe insulation materials, thermal insulation effect increased by 4 to 9 times. In addition, its water absorption is very low, about 0 . 2kg / 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 insulation layers and high-density polyethylene or FRP shells with good water-repellent properties, have changed the situation of the traditional trench laying of heating pipes “ wet cotton padded jackets †, 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 performance, 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 heat pipes do not need to build huge trenches. They only need to insulate the underground heat insulation 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, insulation pipe processing and field trenching are carried out in parallel. Only 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 part of the pipeline, and through the conduction of the alarm line, the exact location and degree of leakage of the thermal insulation pipeline can be shown on the dedicated detection instrument. In order to inform the infiltration personnel to quickly handle the leaked pipe section, to ensure the safe operation of the heating pipe network.
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Titanium is ductile and has a high melting point, making it ideal for extreme heat applications.
Properties of Titanium
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Exceptionally high strength-to-weight ratio
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Corrosion resistant
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Ductile
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High melting point
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Non-magnetic
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Low thermal conductivity
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Low electrical conductivity
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