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Flange comparison Guide - James J. Doherty Ltd.
www.jamesjdoherty.ieFlange comparison Guide Select Size Below for comparison What is DN? DN stands for 'Diameter Nominale'. Put simply, it is a rough translation of mm from imperial sizes, assuming that an inch is 25mm. We refer to a 12" flange as DN300, when in fact it is 304mm. What is the PCD? There are several standards for flanges, and we deal with four of ...