Attentions to Installation of Polyurethane Thermal Insulation Pipe
Polyurethane insulated steel tube prefabricated directly buried insulation pipe, because the polyurethane rigid foam insulation layer is tightly bonded to the outer skin of the steel pipe, and keeps the entry of air and water, can play an excellent anti-corrosion effect. Together, its foam holes are closed and its water absorption is very small. High density polyethylene shell and FRP shell have excellent anti-corrosion, insulation and mechanical functions. Therefore, the task steel pipe skin is very comfortable to the outside air and water corrosion. According to foreign data, the service life of low-temperature prefabricated direct-buried insulation pipe can reach more than 50 years, which is 3-4 times longer than that of traditional trench laying and overhead laying.
The thermal conductivity of polyurethane heat preservation pipe in directly buried heat preservation pipeline is: lambda = 0.013-0.03kcal/m.h.oC, which is much lower than other commonly used pipeline heat preservation data, and the heat preservation effect is increased by 4-9 times. And its water absorption is very low, about 0.2 kg/m2. The reason for low water absorption is that the polyurethane foam has a closed porosity of about 92%. Low thermal conductivity and low water absorption, together with insulation layer and waterproof high density polyethylene or FRP maintenance shell, changed the traditional trench laying of heating pipeline "wearing wet cotton jacket", greatly increased the overall heat loss of heating pipeline, heat loss of heating network is 2%, less than the international norms of 10%.
Anti-corrosion, good insulation function, long service life. The directly buried insulation pipe is tightly adhered to the outer skin of the steel pipe because of the rigid polyurethane foam insulation layer, and the air and water entry can be isolated. Together, its foam holes are closed and its water absorption is very small. High density polyethylene shell and FRP shell have excellent anti-corrosion, insulation and mechanical functions. Therefore, the task steel pipe skin is very comfortable to the outside air and water corrosion. As long as the external water quality of the pipeline is well disposed, according to foreign data, the service life of the directly buried insulation pipe can reach more than 50 years, which is 3-4 times longer than that of the traditional trench laying and overhead laying.
It occupies less land and constructs quickly, which is beneficial to environmental maintenance and disturbs the people. Directly buried heating pipelines do not need to build huge trenches. They only need to bury insulating pipes underground, thus greatly increasing the project area, increasing the amount of earthwork excavation by more than 50%, increasing the amount of civil masonry and concrete by 90%. Together, the processing of insulating pipe and digging ditches on site are stopped in parallel, and the construction period can be prolonged by a large margin with only on-site joints. The transportation of bricks, cement, sand and gravel, residual soil and so on has been added, thus increasing the emission of automobile exhaust, dust and noise in the construction process, thus maintaining the environment.
Ping'an now has leakage alarm lines for directly buried insulating pipes except for those consumed in China. Once leakage occurs somewhere in the pipeline and is transmitted by the alarm lines, the exact position and leakage level of the insulating pipes can be displayed on the public inspection instruments, so as to inform the inspectors to quickly dispose of the leakage pipelines and ensure the safe operation of the heating network. The leakage alarm line of the international consumption heat preservation pipes has been set up at the end of the day, which needs to be filled in.
In summary, all the above-mentioned Shandong Hipper Pipe Technology Development Co., Ltd. provides, want to know more about polyurethane insulation pipe manufacturers, welcome to pay attention to our website: https://www.sdhpgy.com Thank you for your support!
