Compound pipe keeps warm

The utility model discloses a compound pipe keeps warm, including steel pipe and nonrust steel pipe layer, it is used for heat retaining polyurethane insulation layer to be equipped with between steel pipe and the nonrust steel pipe layer, the inboard on stainless steel layer is for being used for anticorrosive modified epoxide resin anticorrosive coating, the inboard of modified epoxide resin anticorrosive coating is high temperature resistant layer, the outside of steel pipe is for being used for antiseptic and rustproof polyethylene powder coating anticorrosive coating, the antibiotic layer of the outside for adding antiseptic of polyethylene powder coating anticorrosive coating. This product not only can insulate against heat in high -efficient heat preservation, improves heat utilization efficiency, can effectively prevent multiplying of bacterium simultaneously, improves the resistance to corrosion of steel pipe and nonrust steel pipe, prolongs long pipeline's life, reduces the use and the cost of overhaul, has wide application prospect.