Nominal Pipe Size

**Nominal Pipe Size**

Nominal Pipe Size (NPS) is a standardized system used to designate the diameter of pipes and fittings in North America. It provides a convenient way to refer to the size of pipes, regardless of the actual internal or external dimensions. NPS is expressed as a dimensionless number (e.g., NPS 6) and correlates to the pipe’s approximate inside diameter for standard wall thicknesses. Understanding NPS is essential for selecting the correct pipes and compatible components in plumbing, piping, and industrial applications. This tag covers topics related to pipe sizing standards, measurement methods, and their practical applications in construction and engineering projects.