When referring to a 15 in concrete or pvc pipe, the measurement represents which part of the pipe?

When referring to a 15 in concrete or pvc pipe, the measurement represents which part of the pipe?

• A. Outside diameter
• B. Inside diameter
• C. Circumstances
• D. Radius

Answer: (B)

The size number on concrete or PVC pipe refers to the bore—the inside diameter. That 15-inch designation describes the space through which fluid flows, not the pipe’s outer wall. The outside diameter is larger because of wall thickness, and fittings are matched to the pipe’s outer dimension while the flow is defined by the inside diameter. Circumference and radius are different measurements and aren’t used to label pipe size, so the inside diameter is the correct interpretation.

The size number on concrete or PVC pipe refers to the bore—the inside diameter. That 15-inch designation describes the space through which fluid flows, not the pipe’s outer wall. The outside diameter is larger because of wall thickness, and fittings are matched to the pipe’s outer dimension while the flow is defined by the inside diameter. Circumference and radius are different measurements and aren’t used to label pipe size, so the inside diameter is the correct interpretation.