Technical parameters: Base pipe: High-frequency weld steel pipe or Straight seam weld steel pipe or helix weld steel pipe or seamless weld steel pipe or globe graphite cast iron pipe. Coating type: edible PE / EP. Coating thickness: 150 to 450micron. Coating color:grey or ivory-white. Calibre size range: Φ½ inch to 8 inch or client requirements. Working temperature: -25 to 120 Centigrade (-13 to 248 Fahrenheit). General bearing pressure: 1.0 to 6.0 MPa. Length: 6meter, 9meter, 12meter or voluntariness length within 12meter or client requirements Connection mode: screw connection or flange connection, steel hoop connection or seamless weld. Application fields: waterworks, waste-water discharging in city planning, freeway and playground rainwater-discharge project, drainage, flood prevention and farmland irrigation.