Is a steel pipe insulation, fiberglass inner sheath fiberglass shell together constitute Buried steam pipe insulation, also includes a high-temperature thermal insulation layer, lubricating layer and an elastic-tight seal. The utility of the new effective solution using prefabricated buried pipe insulation insulation town central heating in 130 ℃ -600 ℃ high temperature heat transport, the slide lubrication and waterproofing exposed pipe ends. Polyurethane insulation pipe components: structural mechanism 1, coating: protective outer steel to avoid corrosion corrosion Buried pipe insulation pipe manufacturers, steel prolong life. 2, the outer jacket pipe: groundwater protection against erosion heat insulation pipe buried pipe insulation, duct work and support can withstand the external load, to ensure normal operation of the working tube. 3, polyurethane foam layer: to ensure that the medium temperature, to ensure the outer protective tube surface at constant temperature.