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Answer Posted / krishna
A pipe is a vessel - a tube is structural.
A pipe is measured ID - a tube is measured OD.
tube will have a consistent OD and it's ID will change.
Engineers see tubes and pipes with different eyes.
A tube is structural.
By having a consistent OD they can vary wall
thickness, changing the ID, to increase strength. Because
they are consistent OD, they have predictable
characteristics.
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