1,Specification: DN30 - DN1400 2,Polyethylene outer casing tube 3,Polyurethane insulation layer 4,Carbon steel pipe Widely used in the urban centralized heat supply, warm room, coal, petroleum, chemical and other industries’ anti-corrosion insulation work.1.Medium temperature: 50°C—140°C2.Operating pressure: <1.6Mpa3.Laid way: Buried, overhead, trench4.Derusting grade of the steel tube: GB/T9823- ...