... oil, cement, mud suction/ discharge/ dredging HDPE Pipe for dredger is most suitable for mud & sand delivery and discharge, the ... resistance is strong, can soak in sea water for 50 years with no change, Anti-uv, anti ... -aging, and it can be used for 5-8 years upon sand content.4. HDPE ... Sand Delivery Pipe is either on land or water for using, total engineering cost is low, high efficiency, ...