Which type of water main pipe can withstand the highest maximum working pressure?

Ductile iron pipes are known for their high tensile strength and excellent durability, making them suitable for high-pressure applications in water distribution systems. The design of ductile iron allows it to accommodate a higher maximum working pressure compared to other types of pipes such as PVC, cast iron, and steel.

One of the key features of ductile iron is its inherent toughness and ability to handle external forces and internal pressures without failing. This strength is attributed to its manufacturing process, which involves the use of a more malleable and ductile form of iron. Consequently, ductile iron pipes are often used in municipal water systems where the potential for high pressure exists, ensuring reliability and longevity.

In comparison, while cast iron also has good pressure ratings, its brittleness and tendency to fracture under certain conditions limit its maximum working pressure capabilities. PVC is a lightweight and corrosion-resistant option that is widely used but generally has a lower pressure rating than ductile iron. Steel pipes, while also capable of high pressures, can be less flexible and more susceptible to corrosion unless properly coated or treated.

Therefore, for applications requiring the utmost in pressure resistance, ductile iron pipes are typically favored, making them the correct choice in this scenario.