High-density polyethylene plastic outer protection polyurethane foam prefabricated direct buried insulation pipe fittings

Polyurethane insulation elbow is an important part of the polyurethane insulation pipeline system, mainly used for insulation compensation when the pipeline is turned, and is composed of high-density polyethylene jacket pipe, polyurethane foam insulation layer and working steel pipe 12. Structure and standards The standard elbow angle includes 30 degrees, 45 degrees, 60 degrees, and 90 degrees, which conforms to CJ/T200-2004, CJ/T104-2005 and other technical standards. Its structure adopts working steel pipe and outer guard pipe closely combined, and the middle is filled with polyurethane insulation layer to ensure that the elbow part and the straight pipe section have the same insulation performance 12 Application scenarios are widely used in central heating heating networks, municipal engineering, petrochemical and other fields, supporting the steering and insulation of liquid/gas transmission pipelines. For example, in central air conditioning ventilation ducts and chemical pipelines, it can effectively solve the problem of thermal insulation and anti-corrosion at the elbow 12 Performance characteristics Excellent thermal insulation performance: the thermal conductivity at room temperature is as low as 0.02 W/mK, which significantly reduces heat loss 4 Waterproof and corrosion resistance: High-density polyethylene outer pipe effectively isolates moisture and corrosive media 12 Long service life: The life of the on-site mold casting structure can reach more than 30 years 12 Easy installation: It supports cold installation, heat shrink belt connection and electric fusion sleeve welding 14 Low comprehensive cost: compared with traditional gutters or overhead laying, it can save a lot of construction costs 13. The production process is mainly divided into welding, stamping, extrusion, casting and other processes, including stainless steel, carbon steel, alloy steel, etc., with a working pressure ≤ of 2.5 MPa and a medium temperature ≤ 120°C