People often ask what the difference is between a pipe and a tube, as they may look much the same. In fact, their naming, measuring and uses make them quite different.
Shape
Pipes are always round, while tubes can be round, square or even rectangular. This flexibility in shape makes tubes more versatile for certain designs.
Measurement
Pipes are measured by their inside diameter and a schedule, which refers to wall thickness. This makes sense, as pipes are designed to move fluids or gases, so the size of the opening is most important. Tubes, however, are measured by their outside diameter and by standard wall thicknesses, which makes them more precise for structural uses.
Telescoping and Rigidity
Tubes can be telescoped, but it is important to consider the inner weld when doing this. Special types, such as drawn over mandrel tubes, are smooth inside and ideal for telescoping. Tubes are generally rigid, but pipes are even more so and require special tools to be shaped.
Uses
Pipes are built to handle pressure and are used mainly to transport water, gas, or other fluids. Tubes are most often used in construction or manufacturing as part of a structure. Copper pipe fittings, like the examples seen at https://watkinspowis.co.uk, can be used with pipes.
Size, Metals and Strength
Pipes are usually available in larger sizes and are often made of black steel, while tubes come in hot or cold-rolled steel. Despite being smaller, tubes are stronger than pipes and better suited for load-bearing roles.
