What is DN (Diameter Nominal) Pipe Size? DN or Diameter Nominal is an International designation (SI or Matric Designator) and a European NPS equivalent to show pipe sizes. Here, you have to note that DN shows pipe sizes differently than NPS. 2" pipe is simply mentioned as DN 50. You can get any NPS to DN by multiplying it by 25.. Metric Pipe Sizes Dn "Diametre Nominel" per ISO vs NPS "Nominal Pipe Size" Equivalent for DN 6 to DN 2200, NPS Schedule 5 to 30. Welded and Seamless PIpe. NPS. DN. OD in (mm) Wall Thickness Inches (mm) Sch 5S. Sch 5. Sch 10S. Sch 10. Sch 20.
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Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] "Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example - 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside.. Metric Pipe Sizes Dn "Diametre Nominel" per ISO vs NPS "Nominal Pipe Size" Equivalent for DN 6 to DN 2200, NPS Schedule 80 to XXS / XXH. Welded and Seamless Pipe. NPS. DN . OD in (mm) Wall Thickness Inches (mm) Sch 80. Sch 100. Sch 120. Sch 140. Sch 160.