What does pipe schedule indicate?

• A. The wall thickness; a 1" schedule 40 pipe is not the same thickness as a 2" schedule 40 pipe. Wall thickness increases with diameter.
• B. The color code of pipe
• C. The temperature rating
• D. The manufacturing origin

Answer: (A)

Pipe schedule indicates wall thickness. This designation shows how thick the pipe wall is, which in turn affects strength and the pressure the pipe can safely carry. For the same schedule, different nominal sizes have different actual wall thickness, so a 1" Schedule 40 pipe isn’t the same thickness as a 2" Schedule 40 pipe. The color code, temperature rating, and manufacturing origin are not determined by the schedule; those details come from other specifications and standards.