What does "NPS" stand for in piping specifications?

"NPS" stands for Nominal Pipe Size, which is a standardized measurement system used to describe the diameter of pipes in the plumbing and piping industries. This designation helps in identifying the approximate diameter of the pipe’s bore, making it easier for professionals to communicate and ensure compatibility among various piping systems and fittings.

The term "Nominal" indicates that the size is not an exact measurement; rather, it provides a "name" that approximates the pipe's size for general purposes. For instance, a pipe labeled as NPS 2 has an actual diameter that is slightly less than 2 inches, which helps facilitate a standardized approach to specifications across different manufacturers and types of pipes.

Understanding NPS is critical for ensuring correct fittings and components are utilized in installations, as well as for adhering to codes and industry standards regarding pipe fittings and connections. This knowledge allows steamfitters and pipefitters to effectively plan and execute their projects, leading to overall efficiency and safety in plumbing systems.