Ductile iron pipe is commonly used for which of the following applications?

• A. Potable water transmission and distribution
• B. Electrical conduit
• C. Gas piping
• D. Non-pressurized drainage

Answer: (A)

Ductile iron pipe is favored for potable water transmission and distribution because it delivers the strength and toughness needed to carry water under pressure over long distances. Its high hydrostatic strength lets it withstand the internal pressures of water mains, while its ductility reduces the risk of brittle failure from ground movement or impact during installation. Interior linings or coatings (such as cement mortar lining or epoxy) protect against corrosion and help maintain water quality, contributing to a long, reliable service life. Coupled with robust jointing systems, these pipes form leak-tight, durable mains suitable for large diameters and deep burial, making them a standard for potable water networks. Other applications rely on materials tailored to those uses (electrical conduit and many gas piping systems have different material/ coating requirements, and non-pressurized drainage often uses plastics or other pipe types), so potable water distribution is where ductile iron pipe is most commonly employed.