What do larger class numbers of ductile iron pipe indicate?

• A. Increased corrosion resistance
• B. Greater wall thickness
• C. Larger nominal size
• D. Higher pressure rating

Answer: (B)

Larger class numbers of ductile iron pipe indicate greater wall thickness. This is crucial in pipefitting as the wall thickness contributes significantly to the pipe's overall strength and ability to handle internal pressures. As the class number increases, the wall thickness of the pipe increases as well, making it more suitable for applications where higher pressures or external stresses are expected.

This added thickness enhances the durability and longevity of the pipe, enabling it to withstand harsher conditions in various environments, such as those found in industrial or municipal applications. Understanding this relationship helps pipefitters select the appropriate pipe class for specific project requirements, ensuring reliability and safety in their installations.