Stainless Steel Tube & Pipe Sizes NPS, Pipe Schedule, DN
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. When NPS over and including 14, pipe OD should actual dimension, for example, NPS20 inch, the diameter should be 508 mm, it convert inch to mm by multiplying it with 25.4.
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