Which joint type is not commonly used today for connecting ductile iron pipe and fittings?

The riveted joint is not commonly used today for connecting ductile iron pipe and fittings due to advancements in joint technology and materials. Riveted joints were more common in earlier construction practices, particularly when metal was shaped into various forms before modern joining techniques were developed. They often required extensive labor and provided less flexibility in application compared to current methods.

In modern water distribution systems, alternatives like bolted, welded, and push-on joints offer more reliability and efficiency. Bolted joints allow for easy disassembly and maintenance, welded joints create a strong, continuous connection, and push-on joints provide a flexible and quick installation method. These joints are designed to meet the challenges of corrosion, water pressure, and ease of installation that are essential in today’s infrastructure. Therefore, while riveted joints played an important historical role, they have largely been replaced by these more advanced and efficient methods in current practice.