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Tube Vs Pipe: What’s the Difference?
Ever wonder why pipe cutting isn’t called tube cutting, and tube expanders aren’t called pipe expanders? Both tools appear to be working on hollow cylinders, so many people wonder what the difference (tube vs pipe) actually is.
What is a Pipe?
It is a cylinder used to transport fluids or gases. For this reason, it is measured by the inside diameter of the shape.
There are different wall thicknesses available, but this is less important than the diameter as a result of the use of pipe to move something. When a person chooses a pipe, they make their selection based on the diameter that they require, and then increase the wall thickness as necessary if strength or pressure is an issue.
In terms of functionality, it closely resembles a hose, but it is solid and more permanent, whereas a hose is usually flexible and portable. Carbon steel is the most popular material.
What is a Tube?
Although it is also cylindrical in shape, the function of a tube is much different. It is most frequently used in building structures.
This means that the outer measurement and strength is more important, and the inner diameter is irrelevant. For this reason, they are designated by their outer circumference and the thickness of the wall.
Tubing is available in a variety of materials. Aluminum, steel alloys, stainless steel, brass, and copper are all common.
Tube vs Pipe Settled
Pipe is made for moving fluids, so its size is listed by a legacy “Nominal Pipe Size” that approximates the inside diameter, with wall thickness set by a schedule. Tube is built for structural strength or precise fit, so it’s specified by its exact outside diameter and a gauge‑style wall.
Tube comes in round, square, or rectangular profiles and is held to tighter tolerances, which makes it costlier but ideal for frames, heat exchangers, and instrumentation, while pipe is always round, more forgiving dimensionally, and cheaper for plumbing or process lines.
The Difference is in the details
Regardless of how similar they appear, tubes and pipes have dramatically different functions. The primary differences between the two are their uses, and how they are measured. This is why we use the different words to describe pipe cutting and tube expanders.