Roll benders

During the roll bending process, the pipe is passed through a series of rollers (typically 3) that apply pressure to the pipe gradually changing the bend radius in the pipe.

The pyramid style roll benders have one moving roll, usually the top roll. Double pinch type roll benders have two adjustable rolls, usually the bottom rolls, and a fixed top roll. This method of bending causes very little deformation in the cross section of the pipe.