A pipe bend is a general term for any change in the direction of a pipe.
Pipe bends are often custom-made to have a specific radius, which can be any size.
They are used to redirect the flow of fluids or gases around obstacles with minimal turbulence or pressure loss.
Pipe bends are different from pipe elbows, which are pre-fabricated fittings with a standard radius (either 1.0 or 1.5 times the pipe diameter).