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Nominal pipe size (NPS)

Nominal pipe size (NPS)

Designates a method of identifying the size of steel pipe without compromising the actual diameter data. Thus nominal 1 inch pipe with the actual external diameter of 1.315 inch (33.40 mm) becomes NPS 1; nominal 14 inch pipe with internal diameter of 13.250 inch (336.55 mm) becomes NPS 14. (0916052)