What type of pipe is commonly used in underground wastewater systems?

Ductile iron pipe is commonly used in underground wastewater systems due to its high strength and durability. This type of pipe is able to withstand the external loads and pressures that are encountered in underground environments, making it suitable for demanding applications such as wastewater transport. Ductile iron pipes also offer excellent corrosion resistance, especially when they are properly coated, and they can handle the dynamic stresses that can occur from soil shifts or water hammer conditions.

In addition, ductile iron pipes are designed to have a longer service life compared to other materials, reducing the need for frequent repairs or replacements, which is crucial in maintaining effective wastewater infrastructure. The robust nature of ductile iron also allows for larger diameter installations, accommodating significant flow rates needed in collection systems.

While other materials such as PVC, concrete, and clay are also used in various applications within wastewater systems, they may not offer the same combination of strength, flexibility, and longevity that ductile iron pipes provide, particularly in large-scale underground systems where the pressures can be quite high.