![]() There is no change in other dimensions when you use DN. ![]() Check the below table for easy understanding. You can get any NPS to DN by multiplying it by 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 Size?ĭN or Diameter Nominal is an International designation (SI or Matric Designator) and a European NPS equivalent 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 to pipe sizes in NB. NB is also an American way to refer to 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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