1. GB/T13793-1992,GB3091-2001 2. O/D*WT: 20-219*1-6mm 3. Capacity: 5000T/Month ... #, 20#,Q195,Q215A,B Q235A,B,Q345A,B,C,D,E 02)O/D*W/T:20mm~219mm*1~6mm 03) Length ... for calculating the H.D.G. pipe weight: WT/Piece=(O/D—Wall Thk)*Wall Thk*0.02466*1.06*Pipe ...