Ductile iron is the most common material used for main water pipelines in distribution systems due to its high strength and durability. This material can withstand high pressure, making it suitable for transporting water over long distances. Additionally, ductile iron has good corrosion resistance, especially when coated, which extends its lifespan in various soil conditions.
It is also relatively easy to repair and maintain, which is crucial for utility operators. The flexibility of ductile iron allows for various installation methods, and it can handle the dynamic loads associated with water flow and external environmental factors. Given these advantages, ductile iron remains the preferred choice for many water distribution systems, particularly for main pipelines serving large areas.