Polyurethane insulating pipe has become a comparatively old and advanced technology in some prosperous countries abroad. Over the past decade, after digesting and absorbing this preemptive technology, heat supply engineers and technicians in China are pushing the domestic pipeline network laying technology to a higher level. Over the past decade, the practice has proved that the laying method of polyurethane tyre thermal insulation directly buried pipe has many benefits compared with traditional trench and overhead laying. This is precisely the inherent power of the polyurethane thermal insulation directly buried pipe in China's heating projects to be rapidly developed.
Benefits of polyurethane thermal insulation directly buried pipe:
1. Reduce the cost of construction. According to the calculation of relevant departments, double-operation heating pipeline can reduce the cost of construction by 25% (using FRP as maintenance layer) and 10% (using high density polyethylene as maintenance layer) under normal conditions. 2. Low heat loss and energy saving. Because polyurethane casein rigid foam is used to stop heat preservation for buried pipes, its thermal conductivity is as follows: lambda=0.013-0.03kcal/m.h.oC, which is much lower than other commonly used piping heat preservation materials, and the heat preservation effect is 4-9 times. And its water absorption is very low, about 0.2 kg/m2. The factor of low water absorption is due to the obturator rate of polyurethane foam is as high as 92%. Low thermal conductivity and low water absorption, together with high density polyethylene (HDPE) or fiberglass reinforced plastics (FRP) maintenance shell with good insulation layer and external waterproofing function, have changed the situation of traditional trench laying heating pipeline "wearing wet cotton jacket", greatly reduced the overall heat loss of heating pipeline, heat loss of heating network is 2%, less than the world's 10% standard.
3. 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, it is very difficult for the outer skin of the working steel pipe to be corroded by the external air and water. According to foreign materials, the service life of polyurethane tyre insulation pipeline can reach more than 50 years, which is 3-4 times longer than that of traditional trench laying and overhead laying. 4. It occupies less land, constructs quickly and maintains favorable environment.
Directly buried heating pipelines do not need to build infinite trenches. They only need to bury insulating pipes in public, which greatly reduces the construction area, reduces the amount of earthwork excavation by more than 50%, and reduces the amount of civil masonry and concrete by 90%. Together, the processing of insulating pipes and digging ditches on site are stopped in parallel, and the construction period can be shortened by more than 50% with only on-site joints.
5. Prefabricated polyurethane cheese insulation pipes produced abroad have leakage alarm lines. Once leakage occurs somewhere in the pipeline and is transmitted by the alarm lines, the precise orientation and leakage level of the insulation pipes can be displayed on the special testing instruments, so as to inform the inspectors to deal with the leakage pipelines quickly and ensure the safe operation of the heating network. Leakage alarm lines are usually installed at the end of domestic heat preservation pipes, which need to be filled in. In a word, polyurethane thermal insulation buried pipe not only has the preemptive technology and useful function which is difficult to compare with traditional trench and overhead pipeline laying, but also has remarkable social and economic benefits. It is also a powerful way to save energy for heating. The selection of directly buried heating pipeline technology marks a new starting point for the development of heating pipeline technology in China.
With the further improvement and development of this preemptive technology, it is imperative to bury heating pipelines directly instead of trenches and overhead. The scheme and construction of polyurethane thermal insulation direct buried heating pipe should be noticed. From the aspects of saving energy, reducing cost, shortening construction period and maintaining environment, polyurethane thermal insulation direct buried heating pipe not only has the technical and useful functions that are difficult to compare with traditional trench and overhead pipeline laying, but also has remarkable social and economic benefits, but also has an excellent direct buried heating pipeline project. It is also necessary to have three conditions: reasonable scheme, reliable quality of insulation pipeline and careful construction.
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