pin and hole

Rack and pinion jacking system

The rack and pinion system is a more advanced and widely-used mechanism in today’s jack-up rigs. The system consists of a pinion attached to the gearbox, which is driven by an electric or hydraulic motor. The pinion rotates and meshes with the RACK (attached to the leg), lifting the leg up or lifting the hull […]

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“Pin and cylinder” jacking system

Also known as “pin and hole”, the system consists of a series of holes that are drilled into the legs and a set of pins that are inserted into these holes. The pins lock the legs in place and hold it. When the rig needs to be moved, the pins are moved and the legs

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