Stainless Steel Pipe/Tube Sizes: DN,Pipe Schedule,NPS

DN Size
The European ISO system is also OD based, Diameter Nominal (DN) is also frequently referred to pipe dimensions, it provides almost the same OD as the ANSI system, but measured in millimeters, and with a lot more choices for different wall thickness.
Pipe Schedule
Wall thickness referred to as the Schedule (Sch.), nowadays, there are large selection of wall thicknesses to meet all applications under different pressure, standard weight (STD), extra-strong (XS), and double extra-strong (XXS) is three main number for thickness, 5S and 10S are thinner wall thickness for stainless steel pipe.
NB (Nominal Bore) is also another method to refer pipe sizes and dimensions, it is the same value between NB and NPS.

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