ISO 7268:1983/Amd 1:1984 Preview
The amendment refers to clause 2 'definition' and states: delete the text and substitute: nominal pressure (PN): A numerical designation which is a convenient round number for reference purposes. All equipent of the same nominal size (DN) designated by the same PN number shall have compatible mating dimensions. Gives additionally two notes.
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ISO 7268:1983/Amd 1:1984