The high-temperature prefabricated direct-buried insulation pipe is composed of internal working steel pipe, polyurethane, glass wool insulation layer, and polyethylene or steel pipe as the outer protection pipe. Its characteristics are that it also includes a high-temperature insulation layer, a lubricating layer and an elastic seal.
Application areas: 1. Widely used in liquid and gas distribution networks
2. Insulation project of chemical pipeline petroleum, chemical industry, central heating and heating network
3. Central air-conditioning ventilation ducts, municipal engineering, etc.
Advantages of high temperature prefabricated direct buried insulation pipe
1 Reduce project cost. According to calculations by relevant departments, dual-pipe heating pipes can generally reduce the project cost by about 25% (using FRP as protective layer) and 10% (using high-density polyethylene as protective layer).
2 Low heat loss and energy saving. The thermal conductivity of the high-temperature prefabricated direct-buried insulation pipe is: λ=0.013-0.03kcal/m?h?oC, which is much lower than other commonly used pipe insulation materials in the past, and the heat preservation effect is increased by 4 to 9 times. Moreover, its water absorption rate is very low, about 0.2kg/m2. The reason for the low water absorption rate is that the closed cell rate of the polyurethane foam is as high as about 92%. Low thermal conductivity and low water absorption, coupled with insulation layer and high-density polyethylene or glass fiber reinforced plastic protective shell with good waterproof performance, has changed the traditional "worn jacket" condition of heating pipes laid in trenches, and greatly reduced the cost of heating pipes. The overall heat loss, the heat loss of the heating network is 2%, which is less than the international standard requirement of 10%.
3. It occupies a small area and works quickly, which is beneficial to environmental protection. Directly buried heating pipelines do not need to build huge trenches, but only need to bury thermal insulation pipes underground. Therefore, the project area is greatly reduced, the amount of earthwork excavation is reduced by more than 50%, and the amount of civil masonry and concrete is reduced by 90%. At the same time, the insulation pipe processing and on-site trenching are carried out in parallel, and only on-site joints are required, which can shorten the construction period by more than 50%. High temperature prefabricated direct buried insulation pipe
4 Security. Except for the high-temperature prefabricated direct-buried insulation pipes produced at home and abroad, all are equipped with a leakage alarm line. Once there is a leakage in the pipeline, the transmission of the alarm line can display the accurate location of the insulation pipe water leakage and water leakage on the special detection instrument And the degree of leakage, so as to notify the infiltration inspector to quickly deal with the leaking pipe section to ensure the safe operation of the heating pipe network. The insulation pipe produced in-house is currently not equipped with a leakage alarm line, and this gap needs to be filled.