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

Ductile Iron Pipe is known for its strength and durability, allowing it to handle high pressures, making it suitable for various water transmission applications. It has a high tensile strength compared to other piping materials, enabling it to withstand significant internal pressures without risk of failure. This property is essential in water distribution systems where pressure can fluctuate due to pump operation or changes in demand.

Ductile iron’s high working pressure tolerance also provides it with resistance to environmental stresses such as corrosion and biological growth, enhancing its longevity and reliability in the field. This makes it a preferred choice in many municipal water systems where reliable performance under pressure is critical.

While PVC pipes are often used for their lightweight and corrosion-resistant properties, they typically have lower pressure ratings compared to ductile iron. Steel pipes also have high strength and can handle substantial pressures, but they are prone to corrosion and may require additional maintenance. Asbestos-cement pipes, meanwhile, have been largely phased out due to health concerns and are not known for high pressure applications. Thus, ductile iron pipe stands out as the option with the highest maximum working pressure.