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PostPosted: Fri Nov 12, 2010 5:55 pm 
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what is the difference between pipe and tube?

please give your opinion.


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PostPosted: Fri Nov 12, 2010 9:44 pm 
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Location: Oregon, USA
For a ASME/ANSI B 36.10 Welded and Seamless Wrought Steel Pipe the inside diameter - ID - of a NPS 2 inches pipe with

•schedule 40 is 2.067"
•schedule 80 is 1.939"

The inside diameters are close to 2" and the nominal diameter related to the inside diameter. Outside diameter are 2.375" for both schedules.

Since the outside diameter of a single nominal pipe size is kept constant the inside diameter of a pipe will depend on the "schedule" or the thickness of the pipe. The schedule and the actual thickness of a pipe varies with the size of the pipe.

The tolerances are looser to pipes compared with tubes and they are often less expensive to produce.

The inside diameter of a tube will depend on the thickness of the tube. The thickness is often specified as a gauge. If we look at Copper Tubes - ASTM B88 the wall thickness of 0.083"of a 2" pipe is gauge 14.

The tolerances are higher with tubes compared to pipes and tubes are often more expensive to produce than pipes.


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PostPosted: Sat Nov 13, 2010 1:37 pm 
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Location: Essen, Germany
In ASME: The difference is the use:
Pipe is used for fluid transport: feedwater pipe, main steam pipe, NPS1" nozzle pipe
Tube is used for heat transfer: HX tubing, Superheater tubes.

In London the subway is called "the tube".

DK


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PostPosted: Sun Nov 14, 2010 1:57 pm 
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Dr. Koelbl wrote:
In ASME: The difference is the use:
Pipe is used for fluid transport: feedwater pipe, main steam pipe, NPS1" nozzle pipe
Tube is used for heat transfer: HX tubing, Superheater tubes.

In London the subway is called "the tube".

DK


in heat exchanger, pipe is use as spacer (spacing between baffle to baffle)...any clarification?


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PostPosted: Sun Nov 14, 2010 5:51 pm 
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Location: Essen, Germany
Zola,

The pipe and tube definition depends on the INTENDED use, also with respect to sizing by the material manufacturer.
ASME COde allows to use pipe also for HX, tubes for transport of fluid. But please note there are different material specs, like SA-312, SA-213.

DK


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PostPosted: Wed Aug 03, 2011 1:18 pm 
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Apart form application there is also difference in Geometrical shapes.
Pipe = Round.
Tube = Square, rectangular, Hexagonal.

Pipe - OD constant
Tube - Defined on ID basis


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PostPosted: Wed Aug 03, 2011 4:36 pm 
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Tube is also round in shape...


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PostPosted: Fri Aug 26, 2011 9:11 am 
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I think we shall refer to ASTM or ASME standard.
In the standard, you can obviously see what is used for tube and what is used for Pipe.
And the answer is open, i also agree some of opinions in this topic.
I attached standards for tube and pipe, if you like, you can refer it.


Attachments:
File comment: World standards list for tube and pipe
World Standard List.pdf [164.34 KiB]
Downloaded 88 times

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PostPosted: Tue Sep 13, 2011 11:51 am 
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Pipe is always round in shape and open at both ends but tube always close at one end at other end is always open.

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PostPosted: Mon Nov 07, 2011 3:10 am 
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Location: Delhi,INDIA
epipeinfo wrote:
Pipe is always round in shape and open at both ends but tube always close at one end at other end is always open.

Tube is used for mass transfer
If mass is not transferd mean pipe for small size

Thanks & Regard
Lalit Mohan Kothari
TUV-NORD Delhi,India

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