Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Pipe vs. Tube

Pipes and tubes are not exactly the same

Sponsored Links

Pipes

The purpose with a pipe is the transport of a fluid like water, oil or similar, and the most import property is the capacity or the inside diameter.

NPS DN pipes

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 is 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 depends on the "schedule" - or the thickness - of the pipe. The schedule and actual thickness of a pipe varies with size of the pipe.

Example - the thickness of a 2" schedule 40 pipe is 0.154" and the thickness of a 6" schedule 40 pipe is 0.280".

It is common to identify pipes in inches by using NPS or "Nominal Pipe Size". The metric equivalent is called DN or "diametre nominel". The metric designations conform to International Standards Organization (ISO) usage and apply to all plumbing, natural gas, heating oil, and in addition to miscellaneous piping used in buildings. Note - the use of NPS does not conform to American Standard pipe designations where the term NPS means "National Pipe Thread Straight".

Nominal Bore (NB) may be specified under British standards classifications along with schedule or wall thickness.

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

Tubes

The nominal dimensions of tubes are based on the outside diameter. If we look at Copper Tubes - ASTM B88 the outside diameter of a 2" pipe is 2.125", relatively close to 2".

NPS DN tubes

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

Tolerances are commonly higher with tubes compared to pipes and tubes are often more expensive to produce than pipes.

Sponsored Links

Related Topics

Related Documents

Sponsored Links

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate
About the Engineering ToolBox!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Citation

This page can be cited as

  • Engineering ToolBox, (2003). Pipe vs. Tube. [online] Available at: https://www.engineeringtoolbox.com/pipes-tubes-d_347.html [Accessed Day Mo. Year].

Modify access date.

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

3 30

Sponsored Links
.