In piping standards, Schedule 40 primarily indicates which characteristic?

In piping standards, Schedule 40 primarily indicates which characteristic?

• A. Interior Diameter
• B. Wall Thickness
• C. Color Coding
• D. Pressure Rating

Answer: (B)

Schedule numbers tell you how thick the pipe wall is for a given nominal size. A higher number means a thicker wall, which is why Schedule 40 is understood as a standard wall thickness. The interior diameter depends on both the nominal size and the wall thickness, so the Schedule designation isn’t a direct statement of the inside diameter. It isn’t about color coding, and while wall thickness affects the ability to withstand pressure, the Schedule label itself is a measure of thickness, not a direct pressure rating. So the characteristic described by Schedule 40 is wall thickness.

Schedule numbers tell you how thick the pipe wall is for a given nominal size. A higher number means a thicker wall, which is why Schedule 40 is understood as a standard wall thickness. The interior diameter depends on both the nominal size and the wall thickness, so the Schedule designation isn’t a direct statement of the inside diameter. It isn’t about color coding, and while wall thickness affects the ability to withstand pressure, the Schedule label itself is a measure of thickness, not a direct pressure rating. So the characteristic described by Schedule 40 is wall thickness.