Pipe schedule refers to a standardized form of measurement for the sizes
of certain types of pipes. It is used for measuring types of pipe that
are usually used in industrial applications.
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The schedule numbers are assigned to fixed outer and inner
diameters for pipes. A schedule number, therefore, demonstrates the
thickness of a pipe's walls, instead of other dimensions related to the
pipe.
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Pipes are used to transport fluids, so an important
measurement is their thickness, which demonstrates their capability to
carry fluids of certain volumes and pressures, depending on the material
of the pipe.
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Pipe schedule formerly was used to demonstrate the pressure
capacity of a particular pipe, but it no longer has that function
because the schedule number is strictly about the dimensions of a pipe
and does not take into consideration the material from which it is made.
A pipe's pressure capabilities differ with different materials.
