![]() You can get any NPS to DN by multiplying it with 25. Here, you have to note that DN shows pipe sizes differently than NPS.Ģ” pipe is simply mentioned as DN 50. What is DN (Diameter Nominal) Pipe Sizes?ĭN or Diameter Nominal is an International designation (SI or Matric Designator) and also a European equivalent of NPS to show pipe sizes. So when someone says 25nb pipe or 50nb pipe basically they are talking about DN. I have also seen that when pipe dimensions are shown in mm (DN) people refer pipe sizes in NB. NB is also an American way to refer pipe dimensions. As such, there is no difference between NB and NPS. NPS is frequently referred as an NB (Nominal Bore).
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