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Classification: Pipe
The classifications of pipes are schedule and nominal diameter. Piping is typically ordered using the Nominal Pipe Size (NPS) standard and by specifying a nominal diameter (pipe size) and schedule number (wall thickness). The schedule number can be the same on different size piping, but the actual wall thickness will be different.

Classification: Tubing
Tubing is used in structural or medical applications, so the outside diameter becomes the important dimension. Tubing is typically ordered to outside diameter and wall thickness; however, it may also be ordered as Outside Diameter and Wall Thickness. Also, tubing is usually ordered and held to tighter and more stringent tolerances and specifications than piping. Ours certainly is!

For detailed information on the differences between pipes and tubes, read our article “Tubing VS. Piping, What’s The Difference?”