Pipe and Tube

What the difference between a pipe and a tube?

Questions by sayed dheya

Showing Answers 1 - 10 of 10 Answers

Pipe is usually denoted by OD x gauge, whereas tube is denoted by ID which is NB x sch. Pipe is used to transfer liquid or gas..whereas tube is used to transfer Heat. Pipe is Flexible,whereas tube is Rigid..

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Kathir

  • Oct 20th, 2015
 

Pipe is generally used for mass transfer and tube for both mass and heat transfer.. Based on the application we can call it. i.e, we have been calling PVC as pipe irrespective to its size, mass transfer.

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krishna

  • Nov 27th, 2015
 

Pipe has large diameter than the tube and length of the pipe is larger than the tube...

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sumit

  • Feb 28th, 2018
 

Pipe is measured with internal dia and Tube is measured with outer dia

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Sagar Kurhade

  • Oct 24th, 2018
 

Pipes are measured in NPS i.e. Nominal pipe size or we say nominal and not actual pipe size and Tubes are measured in actual diameter.

Example: For 2 inch pipe its nominal diameter is 60.3 mm which is standard diameter of 2 inch pipe.
Now in case of 2 inch tube it differentiate as a or measured by its actual dimeter which is 50 mm (outside dim).

Hence its prove diameter of pipe is greater than diameter of tube.

In short: Tube is measured by outside diameter, the pipe is measured by inside diameter.
There is often confusion as to which size die the customer actually needs - Pipe Size or Tubing Size.
Keep in mind that pipe size refers to a nominal - not actual - inside pipe diameter. Schedule refers to the pipes wall thickness. The actual physical OD is larger than its nominal OD.
The dimensions provided for tubing, on the other hand, refer to the actual outside diameter. In other words, the actual physical OD of a tube is just the same as its nominal OD. The size of a tube will keep the same OD no matter what the wall thickness is.
For example: The actual outside diameter of 1 1/4" pipe is 1.625″ - while 1 1/4" tube has a true 1.25″ outside diameter.
Consequently, both the size of tube and pipe is measured by its OD and the thickness.

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