... 3.low cos HDPE Double-Wall corrugated pipe production line- qingdao aorui plastic machinery co.,ltdDouble-wall corrugated pipe of diameter 90- ... Compared with metal, ceramic, concrete and other pipes, double-wall corrugated pipe has many advantage such as lower weight, ... system(smaller diameter), etc.Features of Line:HDPE double-wall corrugated pipe line is configured with high-efficiency single screw ...