Prefabricated direct buried insulation pipe polyurethane insulation pipe manufacturer

Description :

　　Prefabricated polyurethane insulation pipe, high-strength national standard hard insulation pipe, polyurethane direct buried insulation pipe. Prefabricated polyurethane direct buried insulation pipe mainly consists of four parts. 1. Working steel pipe: According to the technical requirements of the conveying medium, welded steel pipes with seams, seamless steel pipes, and double-sided submerged arc spiral welded steel pipes are used. 2. Insulation layer: rigid polyurethane foam. 3. Protective shell: Made of high-density polyethylene or fiberglass. 4 Leakage alarm line: When manufacturing prefabricated polyurethane direct buried insulation pipes, an alarm line is buried in the insulation layer near the steel pipe. Once a leakage occurs in a certain part of the pipeline, the transmission of the alarm line can alarm and display the accurate location and degree of leakage on a dedicated detection instrument, so as to notify maintenance personnel to quickly deal with the leaking pipe section and ensure the safe operation of the heating network. Performance: Prefabricated polyurethane buried insulation pipes have good mechanical and thermal insulation properties, and can withstand high temperatures up to 120 ℃ under normal circumstances. By modification or combination with other insulation materials, they can withstand high temperatures up to 180 ℃ and are suitable for insulation projects of various cold and hot water high and low temperature pipelines.

　　Advantages: 1. Reduce project costs. According to relevant departments' calculations, double pipe heating pipelines can generally reduce project costs by about 25% (using fiberglass as a protective layer) and 10% (using high-density polyethylene as a protective layer). Low heat loss and energy conservation. The thermal conductivity of prefabricated polyurethane buried insulation pipes is λ=0.013-0.03kcal/m · h · oC, which is much lower than other commonly used pipeline insulation materials in the past, and the insulation effect is improved by 4-9 times. Moreover, its water absorption rate is very low, about 0.2kg/m2. The reason for low water absorption is that the closed cell rate of polyurethane foam is up to 92%. Low thermal conductivity and low water absorption, combined with insulation layer and high-density polyethylene or fiberglass protective shell with good waterproof performance, have changed the traditional situation of "wet cotton jacket" for laying heating pipelines in underground trenches, greatly reducing the overall heat loss of heating pipelines. The heat loss of the heating network is 2%, which is less than the international standard requirement of 10%. 3. Anti corrosion, good insulation performance, and long service life.

　　Prefabricated polyurethane directly buried thermal insulation pipe can play a good anti-corrosion role because the polyurethane rigid foam thermal insulation layer is closely bonded to the steel pipe skin, which can isolate the infiltration of air and water. At the same time, its foam pores are all closed, and its water absorption is very low. The high-density polyethylene shell and fiberglass shell both have good anti-corrosion, insulation, and mechanical properties. Therefore, the outer skin of the working steel pipe is difficult to be eroded by external air and water. As long as the water quality inside the pipeline is well treated, according to foreign data, the service life of prefabricated polyurethane buried insulation pipes can reach more than 50 years, which is 3-4 times longer than traditional trench laying and overhead laying. 4. Less land occupation, faster construction, beneficial for environmental protection and reducing construction disturbance to residents. Directly buried heating pipelines do not require the construction of large trenches, only the insulation pipes need to be buried underground, thus greatly reducing project land occupation, reducing excavation volume by more than 50%, and reducing civil engineering masonry and concrete volume by 90%. At the same time, the processing of insulation pipes and on-site trenching are carried out in parallel, and only on-site joints are required, which can greatly shorten the construction period. Due to the reduction in transportation of bricks, cement, sand and gravel, and surplus soil, the emissions of vehicle exhaust, dust, and noise during the construction process have been reduced, thereby protecting the environment. 5. Safe. At present, prefabricated polyurethane buried insulation pipes produced outside of China are equipped with leakage alarm lines. Once a leakage occurs in a certain part of the pipeline, the accurate location and degree of leakage of the insulation pipe can be displayed on a dedicated detection instrument through the transmission of the alarm line, so as to notify the leakage personnel to quickly deal with the leaking pipe section and ensure the safe operation of the heating pipe network. At present, domestically produced insulation pipes are not equipped with leakage alarm lines, and this gap needs to be filled. Summary: In short, prefabricated polyurethane direct buried insulation pipes not only have advanced technology and practical performance that traditional trench and overhead laying pipelines cannot match, but also have significant social and economic benefits, and are powerful measures for heating and energy conservation. The adoption of direct 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 advanced technology, it is imperative to replace trench and overhead heating pipelines with directly buried ones.

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