If two parallel pipe sections are not in the same vertical or horizontal plane, how is the installation described?

When two parallel pipe sections are not in the same vertical or horizontal plane, the installation is described as a rolling offset. A rolling offset involves a bend or curve that allows the pipes to connect while compensating for elevation or depth differences between the two sections. This configuration is particularly useful when there isn't a straight line connection available, and it allows pipes to be effectively repositioned without creating stress or misalignment.

In the context of plumbing, understanding rolling offsets is essential for ensuring proper flow and minimal disruption in the system. It helps in navigating around obstacles, managing changes in elevation, and maintaining a smooth pipeline. A rolling offset is specifically characterized by the curvature created in the piping, while other types of offsets, such as direct offsets or vertical offsets, involve more straightforward, linear adjustments in alignment rather than the gradual curvature found in a rolling offset.