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.
It can also be used for structural applications; hollow pipe is far stiffer per unit weight than solid members. In common usage the words pipe and tube are usually interchangeable, but in industry and engineering, the terms are uniquely defined.
Many industrial and government standards exist for the production of pipe and tubing.The term "tube" is also commonly applied to non-cylindrical sections, i.e., square or rectangular tubing. In general, "pipe" is the more common term in most of the world, whereas "tube" is more widely used in the United States. Źródło: https://en.wikipedia.org/wiki/Pipe_(fluid_conveyance)
The difference between pipes and tubes is simply in the way it is sized.
PVC pipe for plumbing applications and galvanized steel pipe for instance, are measured in IPS (iron pipe size).Copper tube, CPVC, PeX and other tubing is measured nominally, which is basically an average diameter. These sizing schemes allow for universal adaptation of transitional fittings. For instance, 1/2" PeX tubing is the same size as 1/2" copper tubing.
When used in agricultural irrigation, the singular form "pipe" is often used as a plural. Pipe is available in rigid "joints", which come in various lengths depending on the material.Tubing, in particular copper, comes in rigid hard tempered "joints" or soft tempered (annealed) rolls. PeX and CPVC tubing also comes in rigid "joints" or flexible rolls.
The temper of the copper, that is whether it is a rigid "joint" or flexible roll, does not affect the sizing. The thicknesses of the water pipe and tube walls can vary.
Pipe wall thickness is denoted by various schedules or for large bore polyethylene pipe in the UK by the Standard Dimension Ratio (SDR), defined as the ratio of the pipe diameter to its wall thickness.
Thicker walled pipe generally implies greater durability and higher pressure tolerances. Wall thickness does not affect pipe or tubing size.1/2" L copper has the same outer diameter as 1/2" K or M copper.The same applies to pipe schedules. As a result, a slight increase in pressure losses is realized due to a decrease in flowpath as wall thickness is increased.
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