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. Related: Schedule 40 Steel …

The size of pipes, fittings, flanges and valves are often given in inches as NPS - Nominal Pipe Size, or in metric units as DN - 'Diametre Nominal'.

So, the main difference between DN and NPS is that DN indicates the approximate pipe dimensions in mm whereas the NPS indicates the pipe dimension in inches. For pipes larger …

Mar 3, 2018 · – Size : NPS 1 Inch – Size : DN25 mm – Inside Dimeter (Pipe ID) : 26.64 mm – Outside Dimeter (Pipe OD) : 33.4 mm – Pipe Wall Thickness : 3.38 mm – Pipe Weight : 2.5 …

Oct 10, 2022 · A general rule of thumb for NPS vs DN is to divide DN by 25 for NPS when not using reference table. This formula breaks at lower sizes and sizes with fractions.

Nominal pipe size: DN25 Standard: EN10220 Inside diameter [mm] Wall thickness [mm] Mass per unit length [kg/m] 32.7 0.5 0.409 32.5 0.6 0.49 32.1 0.8 0.64 31.7 1 0.805 31.3 1.2 0.962 30.9 …

Mar 10, 2025 · DN is the nominal true diameter in industrial fittings and piping systems and is an important size basis for pipe fittings. DN is often used in American standards to indicate the …