1. n. [Well Workover and Intervention]

A lifting device used when performing coiled tubing operations from a semisubmersible rig or drillship. The coiled tubing injector and pressure-control equipment are positioned within the lifting frame, which is attached to the flow head and running string and supported by the traveling blocks. This configuration enables the heave-compensation system of the rig to counteract the vessel motion.

See: coiled tubing,  traveling block