District Heating Pipe HDPE Outer Casing Extrusion Line, Vacuum Calibration Pre-Insulated Pipe Equipment The equipment consists of a steel pipe chain conveyor and pipe assembling table. The conveyor continuously passes the steel pipe into the PE jacket on the assembling table. Qingdao Huashida District Heating Pipe HDPE Outer Casing Extrusion Line is a professional HDPE outer casing extrusion system designed for DN110-560mm / DN600-1200mm / DN980-1680mm / DN1155-2000mm (outer