


For NPS 14 and larger, the NPS is equal to the outside diameter (OD) in inches. The NPS is very loosely related to the inside diameter in inches, but only for NPS 1/8 to NPS 12. The relationship of these numbers to the actual pipe dimensions is a bit strange. Pipe size is specified with two non-dimensional numbers: a Nominal Pipe Size (NPS) and a schedule (SCH). The same pipe dimensions are used with different names in Europe. Nominal Pipe Size (NPS) is a set of standard pipe sizes used for pressure piping in North America.
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