... , oil, cement, mud suction/ discharge/ dredging HDPE Pipe for dredger is most suitable for mud & sand delivery and discharge, the performance is ... efficiency.5. HDPE Pipe has smooth outer and inner wall, friction coefficient is tiny, high transmission efficiency than steel pipe 20 ... . HDPE Sand Delivery Pipe is either on land or water for using, total engineering cost is low, high efficiency, safer, ...