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Standard Pipe Diameters and DN Equivalents in Steel Pipes Pipe Diameters and DN Equivalents in Steel Pipes DN (Nominal Diameter): A term used in European standards that indicates the nominal inner diameter of the pipe in millimeters. Standard Pipe Diameters: Steel pipes are produced in various diameters. The most commonly used standard pipe diameters and their DN equivalents are shown in the table below: Outside Diameter (mm) DN Wall Thickness (mm) 10.2 6 1.0 13.3 8 1.2 17.2 10 1.2 21.3 12 1.5 26.9 15 1.7 33.7 20 2.0 42.4 25 2.3 48.3 32 2.9 60.3 40 3.2 73.0 50 3.6 88.9 65 4.0 108.0 80 5.0 133.0 100 6.0 […]