Technician A says that tubing's size is determined by its inside diameter (I.D.). Technician B says that pipe thread size is sized by its inside diameter (I.D.), and tubing's size is determined by its outside diameter (O.D.). Who is correct?

Question

Quizplus · Accepted Answer

Technician B is correct because pipe thread size is indeed often referred to by its nominal inside diameter, but tubing is typically sized by its outside diameter (O.D.).

Technician a Says That Tubing's Size Is Determined by Its