Pipe is The nominal diameter is divided into equal parts and constant, its nominal diameter means an internal diameter of the tube substantially. Therefore, always it has a constant outer diameter larger than the nominal diameter, and the number scheduled to appear differently than the thickness of the pipe wall by pressure.Thus, pipe fittings also marked with a nominal diameter has been internationally standardized by the keyed to the outer diameter of the nominal diameter.

Tube is Mainly used in non-ferrous metal or non-metal pipe and is the production, as it does not have the thickness of the pipe wall as the pipe because of economical problems. Along four tubes indicates the tube diameter to the nominal diameter and the outer diameter without the thickness of the pipe wall are shown in the actual wall thickness of no schedule number. Tubes are used is important for the small pipes inside the unit, such as heat exchangers, instrumentation piping and compressor, boiler and chillers.

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