Ductile iron pipe and prestressed reinforced concrete pipe (applicable to large-diameter pipe, the maximum diameter has exceeded 2000), has the following characteristics: (1) Save energy, the main material is sand, stone, can be drawn on the spot. (2) Heavy weight, brittle texture, difficulty in cutting, and relatively large difficulty in construction. (3) The working pressure is 2o% to 40% lower than that of the ductile tube, which is 0.15-0.25MPa. (4) The maximum deflection angle is 1.5 degrees, and the ductile iron pipe is up to 3.0 degrees, so the pre-stressed reinforced concrete pipe has poor terrain adaptability. The above information is provided by 51 Steel Pipe Net.