HDPE pipes for water, oil, cement, mud suction/ discharge/ dredging HDPE Sand Delivery Pipe is most suitable for mud & sand delivery and ... transportation engineering of high efficiency.5. HDPE Sand Delivery Pipe has smooth outer and inner wall, friction coefficient is tiny ... total engineering cost is low, high efficiency, safer, and more convenient.HDPE pipe types: SDR33, SDR26, SDR21, SDR17, SDR13.6 ...