Buried polyurethane insulation stacking and storage 1, heat pipe disposal site should be smooth, no debris, no water, and there is sufficient bearing capacity. 2, pipe insulation should be stacked away from the heat source than 2m, and a fire-fighting facilities. 3, open dumps, insulation application tarpaulins covering, non-exposure, rain, and should have good drainage. 4, pipe insulation storage construction site, there should be special care. 1, carefully read the institute's design engineering drawings, design and construction instructions. 2, receiving and inspection of all pipe insulation to be installed. 3, pipe. 4, welding steel, welding groove, surface quality should GB50236-98 "site design, working pipe welding construction and acceptance of" execution. 5, hydrostatic test, the test pressure should be based on 1.5 times the design pressure, and not less than 0.4MPa OK. 6, joints foamed-in insulation. 7, the outer pipe welding, pipe joints should be removed before welding on the debris, traces of oil and so on. 8, fill sand, back to earth 9, acceptance of polyurethane buried pipe insulation classification is very complex, generally in accordance with people's habits about several ways in accordance with its transmission medium temperature can be divided into: normal polyurethane buried pipe insulation, high temperature polyurethane buried pipe insulation, cryogenic polyurethane buried pipe insulation; 2. The outer sheath can be divided into: the glass steel outer sheath polyurethane buried pipe insulation, high-density polyethylene outer sheath polyurethane buried pipe insulation, steel outer protective layer of polyurethane insulation Buried pipes and other buried insulating outer sheath tube; 3. different transmission media there are many: prefabricated polyurethane insulation as water supply, the high temperature polyurethane insulation, use of steam for Steam buried polyurethane composite prefabricated pipe insulation, the use of oil buried rigid polyurethane foam insulation pipe corrosion and so on. There are many called as polyurethane pipe, polyurethane prefabricated pipe, buried prefabricated polyurethane tube, polyurethane jacket pipe, polyurethane foam insulation tubes and so on.