DN
as defined in Directive 2014/68/EU of the European Parliament and of the Council of 15 May…, Article 2, point (11) (Definitions)
a numerical designation of size which is common to all components in a piping system other than components indicated by outside diameters or by thread size; it is a convenient round number for reference purposes and is only loosely related to manufacturing dimensions; the nominal size is designated by DN followed by a number;
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Also defined in
- Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the… 31997L0023, Article 1(2), point (26)
a numerical designation of size which is common to all components in a piping system other than components indicated by outside diameters or by thread size. It is a convenient round number for reference purposes and is only loosely related to manufacturing dimensions. The nominal size is designated…