Pipe 350 mm and larger is identified by OD?

Study for the Gas Metal Arc Welding Exam, including GMAW, FCAW, and MCAW methods. Use flashcards and multiple choice questions with hints and explanations for effective learning. Get ready for your welding certification!

Multiple Choice

Pipe 350 mm and larger is identified by OD?

For large pipes, the actual external dimension becomes the reliable way to identify the size. When you reach about 350 mm (roughly 14 in) and larger, the nominal bore no longer provides a consistent reference because wall thickness and the resulting inside diameter vary a lot with different schedules. Using the outside diameter as the identifying feature avoids confusion and ensures fittings, flanges, and connections match the true pipe size. So yes, pipes of 350 mm and larger are identified by their outside diameter.

For large pipes, the actual external dimension becomes the reliable way to identify the size. When you reach about 350 mm (roughly 14 in) and larger, the nominal bore no longer provides a consistent reference because wall thickness and the resulting inside diameter vary a lot with different schedules. Using the outside diameter as the identifying feature avoids confusion and ensures fittings, flanges, and connections match the true pipe size. So yes, pipes of 350 mm and larger are identified by their outside diameter.

More practice questions