All kinds of pipe insulation has a particularly outstanding advantages: 1, good insulation properties of polyurethane insulation steel jacket pipe insulation, heat loss is only 25% of traditional pipe insulation Buried pipes, long run can save a lot of energy, significantly reduce energy costs . 2, polyurethane insulation also has a strong water pipe insulation and corrosion resistance, without attached trench can be directly buried in the ground or water, construction easily and quickly, and lower total cost. Polyurethane foam casting: 1.05 → measurement equipment flow → Set pouring time (feeding amount / flow): 1 adjustment foaming machine mixing ratio. HDPE pipe is completed in the middle wearing armor tube plugging the pipe ends are on location open after pouring hole → The foam machine mixing head of the nozzle is inserted into the pouring hole → casting → empty plug sealing material pouring hole → aging → disassemble card Head → test → Correct feeding amount → finished. Pipe insulation is jointly constituted by steel, fiberglass inner sheath fiberglass shell, and also includes high temperature insulation insulation, 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.