Definition(s)
Caterpillar
Device that holds the umbilical between belts or pads and which transfers axial linear motive power to the umbilical. NOTE A caterpillar is also known as an in-line cable engine, or haul off, or tensioner.
Source: API SPEC 17E, Specification for Subsea Umbilicals, Upstream Segment, Fourth Edition, October 2010. Global Standards