Polyurethane composite short pipe for conveying coarse particles, high-pressure, high-speed media, in this mining conditions, polyurethane able to maximize the advantages. In fine particles (-200 mesh accounted for more than 80%), low pressure (2.0Mpa below), low flow rates (<1.8m / s = soft medium to reflect their superiority small. Features: 1, anti-aging 2, abrasion resistance, optimal impact resistance 3, anti-fouling 4, small running resistance 5, good combination 6, light weight, easy to install