+3 votes
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What is difference between Pipe & Tube

asked Aug 13, 2014 in Engineering by anonymous
commented Aug 13, 2014 by keler01 (1,380 points)
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3 Answers

+4 votes
answered Aug 13, 2014 by Normandy (21,040 points) | selected Sep 1, 2014 by odadmin
 
Best answer
Pipe and tube terms are interchangeable. They are both produced with hollow cylinder to move gases and/or liquids as well as other non-fluid products. They are widely used in a wide range of industries but the most stringent requirements are in the Oil and Gas industry.

With that said, pipe is often specified by a nominal diameter and a schedule that defines the thickness, and tube is usually specified by the outside diameter and wall thickness but could be specified by outside diameter or inside diameter and wall thickness. For example, an 1” pipe is not actually measured 1” in either outside or inside diameter, whereas 1” tube is specified by actual inside diameter or outside diameter, and wall thickness.

However, a tube has tighter engineering requirements than a pipe. When industry specifies a tube, it is often referred to as a small tube while pipe is often referred to as larger and more solid, rigid.

In addition, the term “pipe” is widely used in the world as a hollow cylinder; the term "tube" is often differentiated in the United States as a smaller diameter cylinder.

Hope that provides some thoughts. Welcome for more comments.
+3 votes
answered Aug 13, 2014 by keler01 (1,380 points)

Also, tubes generally refers to a round, square, rectangular, etc., shape of hollow material of uniform thickness.

Following figure illustrates the difference b/w the pipe and tubing of the same schedule:

Pipe and tube difference

 

+1 vote
answered Aug 14, 2014 by michelnr (590 points)
Tubes have a smaller bore ID compared to pipes and thus at lower line sizes (usually below 2"), tubing is preferred since it will not break easily. Tubes usually comes in stainless steel and duplex, while pipes comes in CS, SS and Duplex, etc.
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