High temperature insulation prefabricated buried pipe only traditional waste and overhead laying pipeline incomparable advanced technology, practical performance, but also has significant social benefits and the associated economic benefits, but also the most effective energy saving measures heating. High temperature prefabricated buried pipe insulation is used in buried heating pipe technology, marking technology heating pipes China has entered a new starting point. All kinds of pipe insulation has a particularly outstanding advantages: 1, good insulation properties of polyurethane insulation steel jacket buried steam pipe insulation, heat loss is only 25% of traditional pipe polyurethane buried pipe insulation, long run can save a lot of energy insulation manufacturers, significantly reduce energy costs. 2, polyurethane insulation also highly waterproof and resistant to corrosion pipe insulation, 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.