What diameter does a 45 degree pipe elbow typically have?

A 45-degree pipe elbow is designed to allow for a gradual change in direction in piping systems and comes in various sizes to accommodate different diameters of pipes. The common diameter for a 45-degree elbow, particularly in standard applications, is often around 8 inches. This size is widely used across different industrial and plumbing applications, making it a typical choice for installations requiring moderate changes in direction without creating too much turbulence or pressure drop.

Larger or smaller elbow sizes do exist, but the selection often depends on the specific requirements of the piping system, including flow rates and the type of fluid being transported. Therefore, while 5, 12, and 16 inches can be found in specific contexts, 8 inches generally serves as a standard option for a 45-degree elbow in many scenarios.