Pipes that are clipped by a volume are labeled differently than other pipes and pipe parts that appear inside the volume. Depending on the direction of the pipe and the Look Direction of the view, a pipe is either labeled on the outside of the view with a leader, or it is resymbolized. Clipped pipes that run perpendicular to the look direction are labeled with a jogged leader outside of the drawing volume. Clipped pipes that are directly parallel to the look direction are resymbolized.
Example of clipping labels fanning out to find white space: