In common usage the words pipe and tube are usually interchangeable, but in industry and engineering, the terms are uniquely defined. It can also be used for structural applications hollow pipe is far stiffer per unit weight than solid members.
In general, "pipe" is the more common term in most of the world, whereas "tube" is more widely used in the United States.Ī pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow - liquids and gases (fluids), slurries, powders and masses of small solids. The term "tube" is also commonly applied to non-cylindrical sections, i.e., square or rectangular tubing. Many industrial and government standards exist for the production of pipe and tubing. While similar standards exist for specific industry application tubing, tube is often made to custom sizes and a broader range of diameters and tolerances. Pipe is generally manufactured to one of several international and national industrial standards.
Tube is most often specified by the OD and wall thickness, but may be specified by any two of OD, inside diameter (ID), and wall thickness. Depending on the applicable standard to which it is manufactured, pipe is generally specified by a nominal diameter with a constant outside diameter (OD) and a schedule that defines the thickness. In common usage the words pipe and tube are usually interchangeable, but in industry and engineering, the terms are uniquely defined. A pipe is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section, used mainly to convey substances which can flow - liquids and gases (fluids), slurries, powders and masses of small solids.
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