Construction polyethylene pipe insulation and some forms of hydrophobic closed system uses flexible layout, reasonable structure, safe and reliable. Row tide steel casing pipe on both timely discharge of prefabricated polyurethane insulation wet gas pipeline, but also as a daily alarm signal tube running. Thermal compensation pipes made of high quality steel bellows compensator jacket steel steam pipe insulation, and installed in the casing, made in the form of buried pipe insulation, do not set up observation wells, construction convenient operation, short construction period. For conveying 2.5MPa, 350 degrees Celsius below the steam or other media polyurethane jacket pipe insulation, this product made with steel outer protective layer, high strength, not damaged, the construction is simple maintenance, long service life advantages of prefabricated buried pipe insulation become One of the more popular modern new products, the structure of this product have more features and is mainly composed of three parts composed. The product had on many occasions by the same public recognition and support, mainly because of the installation of this product can reduce the amount of workers of workers. Heating cities and towns are required to use high-temperature heat transport mainly used prefabricated buried pipe insulation, the product which has the greatest convenience is an alarm line, the role of this alarm line is specialized alarms and display leakage place where. When maintenance workers to receive service information in a timely manner when you can drive over.