The primary difference between pipe and tubing is how they are measured and what they are used for. Pipe is used as a vessel and is measured by ID (inside diameter). Tubing is usually structural and is measured by OD (outside diameter). Tubing can be either rigid or flexible. i.e. Copper tubing can be bent around corners. Copper pipe is rigid and straight.
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More often than not, people guess it has something to do with the quality of the materials, but that's got nothing to do with it. The difference between a pipe and a tube is how they are measured, and ultimately what they are used for.
A pipe is a vessel - a tube is structural.
A pipe is measured ID - a tube is measured OD.
How they are measured... Pipes are measured ID or inside diameter because they are vessels. Tubes are measured OD or outside diameter because they are structural.
Pipes have a consistent ID regardless of wall thickness. In other words, a 1/2" high pressure pipe may need a 2" thick wall, but the ID will still only be 1/2" even tho the OD is 4.5".
Generally speaking, a 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.
Again, the difference is simple, it's how they are measured and what their intended uses are.
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See the attachment
Regards,
Sachin Joshi
-----Original Message-----
From: Nikhil <nikhilrp_2006@rediffmail.com>
Reply-to: materials-welding@googlegroups.com
To: alouis1972@yahoo.co.in
Cc: materials-welding@googlegroups.com
Subject: [MW:2628] Re: 2401] Re: Diff. bet' n pipe & tube
Date: 6 Jul 2009 05:14:30 -0000
I have small doubt. Why, in Instrumentation field, the system used, to transmit air pressure to instruments, is called tubing and not piping?
Kind Regards,
Nikhil
On Sat, 04 Jul 2009 18:44:07 +0530 wrote
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>API 574 clearly defines what is piping and tubing
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>Piping
>A pressure tight cylinder used to convey a fluid or transmit a fluid pressure, ordinarily designated "pipe" in applicable material specifications. {Materials designated "tube" or "tubing" in the specifications are treated as pipe when intended to pressure servic}
>
>Tubing
>"Tube" or "Tubing" is which is used for heat transfer , if you use for a fluid or fluid pressure it is called piping.
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> Looking for local information? Find it on Yahoo! Local http://in.local.yahoo.com/
>>
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