... surface.3. HDPE Sand Delivery Pipe has good wear-resistance, it is 4-8 times of steel pipe, use longer, Piping material of corrosion ... disassembly, ensure transportation engineering of high efficiency.5. HDPE Sand Delivery Pipe has smooth outer and inner wall, friction coefficient is ... cost is low, high efficiency, safer, and more convenient.HDPE pipe types: SDR33, SDR26, SDR21, SDR17, SDR13.6, SDR11 ...