Reading more about pipe and tube differences. The pipe’s inside diameter is defined by the outside diameter and Schedule.When NPS over and including 14, pipe OD should actual dimension, for example, NPS20 inch, the diameter should be 508 mm, and it should converted inch to mm by multiplying it by 25.4.From NPS 1/8 to NPS 12 (including) the value is nominal, not actual OD, for example, NPS 6 inch (DN150), pipe outside diameter should be 168.3 mm, not 152.4 mm.NPS and DN values are different, they have a corresponding value for outside diameter in millimeters, when NPS ≥ 4, the related DN = 25 multiplied by the NPS number.SUMMARY: from the above table, we can see that: Nominal Pipe Size, Diameter Nominal and pipe Schedule ChartĪSME B36.19 indicates Stainless Steel Pipe dimensions including the outside diameter and the Schedule wall thickness, the Schedule Number has an “ S” suffix for wall thickness, having SCH 5S, SCH 10S, SCH 40S, SCH 80S.ĪSME B36.10 standard determines carbon steel pipe dimensions, without an “S” suffix for pipe schedule. The European ISO system is also OD-based, Diameter Nominal (DN) is also frequently referred to as 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 thicknesses. Wall thickness is referred to as the Schedule (Sch.), nowadays, there is a large selection of wall thicknesses to meet all applications under different pressures, standard weight (STD), extra-strong (XS), and double extra-strong (XXS) are 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 to pipe sizes and dimensions, it is the same value between NB and NPS. The North American ANSI system is widely applied in pipe systems, Nominal Pipe Size ( NPS) is defined standard size for pipes used for different pressures and temperatures, the outside diameter is used in inches, NPS and OD values are not always equal, from NPS ⅛ to 12 inch, the NPS and OD values are different, over 14 inch, the NPS and OD values are equal, the size is actual dimensions, not nominal. Nominal Pipe Size, Diameter Nominal and pipe Schedule.
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