Buried polyurethane insulation tubes known as "pipe-in-pipe" that they have "two-step" structure, is made of high density polyethylene outer protective layer of polyurethane rigid foam plastic pipe and pipe components. Insulation material density 60kg / m3 to 80kg / m3 rigid polyurethane foam, fully fill up the gap between the pipe and the casing, and has a certain adhesive strength, the steel pipe, the outer sleeve and insulation among forming a solid overall. Buried polyurethane foam insulation tubes with good mechanical properties and thermal insulation properties, generally the case may be modified by temperature or other insulating material combinations can be temperature 120 ℃ 180 ℃. Overview In order to meet the urban central heating and work ... polyurethane insulation buried pipe in some foreign countries has become a relatively mature and advanced technology. Over the last decade, our heating engineering and technical personnel through the digestion and absorption of this advanced technology is driving the domestic pipeline laying technology to a higher level. 10 years of practical results fully proved casein polyurethane insulation buried pipe laying method compared with the traditional trench and laying of overhead, it has many advantages. Buried pipe insulation is made of steel transmission medium, high density polyethylene outer tube, and rigid polyurethane foam insulation pipe and the jacket pipe closely together. This is exactly the casein polyurethane insulation buried pipe heating project in our country ... polyurethane buried pipe insulation has a very prominent advantages: 1, polyurethane buried pipe insulation good insulation properties, heat loss is only 25% of the traditional pipe , long run can save a lot of energy, significantly reduce energy costs. 2, highly waterproof and corrosion resistance, without attached trench can be directly buried in the ground or water, construction easily and quickly, and lower total cost. 3, at low temperatures also have good corrosion resistance and impact resistance, and can be directly buried underground permafrost. 4, the service life of up to 30 - 50 years, proper installation and use can make the pipe network maintenance costs low. 5, you can set the alarm system, automatic detection of pipeline leakage fault, accurate fault location and automatic alarm indication. 6, the service life of up to 30 - 50 years. Diameter: DN15 - DN600 Thickness: 15--50mm Uses: central heating pipes, cooling pipes, industrial pipes. 7, the oxygen index: ≥27 Density: 40--70kg / cubic m Hydrophobic rate: 0.03kg / cubic cm Thermal conductivity: 0.022kcal / mh ℃ polyurethane insulation buried pipe in some foreign countries has become a more mature advanced technology. In recent years, China Heating engineering and technical personnel through the digestion and absorption of this advanced technology is driving the Chinese domestic pipeline laying technology to a higher level. The results of years of practice has fully proved the polyurethane insulation buried pipe laying method casein compared with the traditional trench and laying of overhead, it has many advantages. This is exactly the casein polyurethane insulation buried pipe to the rapid development of intrinsic motivation heating project in China.