... hdpe Pipe:1,materials:100% pe; 2,dn:20-1000mm; PE-RT underground heating pipes 1.suitable for ... to prepare: According to installing the pipe specification, assemble heat melting device well, ... of welder reach the suitable density for pipe fittings to insert, heating after the ... pipe whirlingly on the pipe fittings, connect the place and forming the even flange, keep 2-5s, natural cooling. white hdpe Pipe ...