Tubes are used in structural terms. The strength of any tube structure depends on its wall thickness. Greater is the wall thickness, greater will be the strength of the tube. Hence a tube can be defined in terms of its outside diameters and the wall thickness. There are many shapes in which tubes can be made, and are not limited to being circular only. There can be square and rectangular tubes as well. These oddly shaped tubes are however built from a mother tube which is always round in shape.
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Pipes are normally used for the transportation of gases and fluids, and it is for this very reason that the internal diameter becomes the dimension of significance. Pipes are identified through Nominal Pipe Size and Diameter nominal in the inches and the metric system respectively.
Pipes can be made by a variety of mechanical processes, such as forming, drawing and extrusion. They are mainly made of steel, but other materials can also be used depending on the requirement.
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