How is large diameter pipe over 12" sized?

Large diameter pipe over 12 inches is sized by its outside diameter and wall thickness. This method of sizing is crucial for ensuring compatibility with fittings, joints, and other piping systems. The outside diameter helps determine how the pipe will connect with other equipment and structures, while the wall thickness is essential for calculating pressure ratings and ensuring structural integrity.

Using outside diameter is particularly important in large pipes because it allows for more straightforward measuring and installation in various applications, from industrial to municipal systems. This method improves compatibility and ensures that the physical properties of the pipe meet the requirements of the system in which it will be used.