Which option best describes what Schedule 40 specifies for pipes?

Which option best describes what Schedule 40 specifies for pipes?

• A. Wall thickness
• B. Flow capacity
• C. Friction loss
• D. Tubing strength

Answer: (A)

Schedule numbers tell you how thick the pipe walls are. Schedule 40 is a common thickness that gives a specific wall thickness and, therefore, a defined pressure rating for that nominal pipe size. The primary meaning of Schedule is wall thickness: thicker walls mean stronger pipe and higher allowable pressure, while the internal diameter is slightly reduced. Flow capacity, friction losses, and tubing strength are influenced by size and material, but the Schedule designation itself is about wall thickness, not those other aspects.

Schedule numbers tell you how thick the pipe walls are. Schedule 40 is a common thickness that gives a specific wall thickness and, therefore, a defined pressure rating for that nominal pipe size. The primary meaning of Schedule is wall thickness: thicker walls mean stronger pipe and higher allowable pressure, while the internal diameter is slightly reduced. Flow capacity, friction losses, and tubing strength are influenced by size and material, but the Schedule designation itself is about wall thickness, not those other aspects.