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Active Contributor

Join Date: Feb 2017
Posts: 12

Pipe and Tube

03/06/2017 1:07 AM

hi everyone .

am new to piping sector. kindly please clarify my doubts.

pipe is identified by the NB(Nominal Bore), tube as well by OD(outer diameter). when we internally polish the pipe, we will be loss the constant internal dia value of a pipe.

1.how we have to call ? pipe or tube?

2. if we call tube , whether the Outer Dia of tube is same as the internally polished pipe OD ?

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Guru

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#1

Re: pipe and tube

03/06/2017 1:31 AM

Typically tubing is flexible and pipe is rigid....The OD will vary with the schedule type or thickness grade of the pipe....Tubing is usually graded by pressure tolerance and material type...

http://petrowiki.org/International_standards_for_tubing

http://www.engineeringtoolbox.com/pipes-codes-standards-t_17.html

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#2

Re: pipe and tube

03/06/2017 2:05 AM

Pipe is specified by nominal, not actual, ID. Each nominal size has an actual OD to which it is made, and a schedule number that indicates wall thickness. Thus there is no constant actual ID for any given nominal ID. Tables of dimensions are readily available on line and from manufacturers. The dimensions differ for steel versus copper pipe.

Tube is typically specified by actual OD and then either ID or wall thickness.

There are historical and language reasons for this complexity, with some variation from region to region.

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Power-User

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#3
In reply to #2

Re: pipe and tube

03/07/2017 9:39 AM

So call it what you started with before polishing, pipe or tube, so that the end user knows how to fit it up with other components. You could measure the wall thickness after polishing and list that, to avoid misunderstanding.

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Guru

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#4

Re: Pipe and Tube

03/07/2017 11:42 AM

"Pipe" (and "tubing" as well, I'm willing to bet) is specified in numerous different ways, depending on its ultimate usage (which you haven't told us).

Pipe (for gas, oil, and hazardous liquids use, not 'water'), is specified by its "ID," up until 12 inch inside diameter, then (from 14" on up) it is specified by its "OD" (which, to some, is simply semantics).

Might we ask for just a few "specifics?"

I'd like to know: what is this "pipe" being used for, and what is the purpose for "polishing" (one would assume to reduce friction loss).

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