... brings many advantages like higher stiffness, less weight, low cost, large diameter, etc.The new pipe has showed its irreplaceable advantages ... pipe, the steel rib is completely covered with polyethylene, the liquid, air and soil cannot contact with the steel reinforcement, so ... 9000900>10421000>10481200>1067 GS/TL20001300>10801500>101061800>101462000>10162 Large Diameter Drainage Pipe machine