NPS
Nominal Pipe Size
The North American label for pipe size. It is a name, not a measurement — NPS 2 pipe is not 2 inches in any dimension you can measure. From NPS 14 upward the number does equal the outside diameter in inches.
Piping inspection and supervision, explained from scratch
Nominal Pipe Size
The North American label for pipe size. It is a name, not a measurement — NPS 2 pipe is not 2 inches in any dimension you can measure. From NPS 14 upward the number does equal the outside diameter in inches.