NPS (Nominal Pipe Size) is a pipe and tube database for piping engineers and students. The database includes dimensional, weight and flow information for more than 3000 sizes of standard and specialty pipes and tubes (from 1/8&quot\; to 72"nominal size) in over 25 different materials, including metals, plastics and composites. The data can be displayed in US, Imperial or metric units. A piping calculator is included which shows weight and dimensional data for lengths of pipe in various units.