The effect of anti-corrosion and insulation of thermal insulation pipes

Insulated pipes have a good anti-corrosion effect because the polyurethane rigid foam insulation layer is tightly bonded to the outer skin of the steel pipe, which isolates the penetration of air and water. High-density polyethylene shell and fiberglass shell both have good anti-corrosion, insulation and mechanical properties. At the same time, its foaming holes are closed and its water absorption is very small. Therefore, the outer skin of working steel pipes is difficult to withstand corrosion from outside air and water.

The service life of insulated pipes can reach more than 50 years, which is 3 to 4 times longer than traditional trench laying and drainage laying. It is much lower than other commonly used insulation pipe materials in the past, and the insulation effect is improved by 4 to 9 times. Furthermore, 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 polyurethane foam is as high as about 92%.
Insulated pipes do not require the construction of huge trenches, but only need to be buried underground, thus greatly reducing the project area, reducing the amount of earth excavation by about 50%, and reducing the amount of earthwork masonry and concrete by 90%. At the same time, the processing of insulated pipes and on-site trenching are carried out in parallel, and only on-site joints are needed, which can shorten the construction period by more than 50%.
It is much lower than other commonly used insulation pipe materials in the past, and the insulation effect is increased by 4 to 9 times. Furthermore, 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 polyurethane foam is as high as about 92%. Low thermal conductivity and low water absorption, coupled with the insulation layer and high-density polyethylene or fiberglass protective shell with good waterproof performance on the outside, have changed the situation of traditional trench laying heating pipes "wearing wet cotton jackets", greatly reducing the risk of heating pipes Overall heat loss, the heat loss of the heating network is 2%, which is less than the international standard requirement of 10%

It has good anti-corrosion and insulation properties and long service life.
The polyurethane rigid foam insulation layer of the insulated pipe is tightly bonded to the outer skin of the steel pipe, which isolates the infiltration of air and water and can play a good anti-corrosion role. At the same time, its foaming holes are closed and its water absorption is very small. High-density polyethylene shell and fiberglass shell have good anti-corrosion, insulation and mechanical properties. Therefore, the outer skin of the working steel pipe is difficult to be eroded by 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 high-temperature prefabricated directly buried insulated pipes can reach more than 50 years, which is 3 to 4 times longer than traditional trench laying and overhead laying.