Every jacking system has its limitations in terms of weight. Those limitations are not the same for every operation mode. Usually you will find three types of limitations in the operation manual of the barge: Maximum JACKING rating: It refers to the maximum load that the jacking system can handle. This rating determines the rig’s […]
Jacking Control Systems are used to control the jacking system. This interface allows the operator to raise and lower the rig’s legs, so it could be positioned at the desired height above the water level. Control system consists of: Human-machine interface (HMI) – a screen that shows system parameters to the operator Joystics –
Planetary gearboxes serve a major role in the mechanics of jacking system. Their purpose is to provide a mechanical advantage, i.e. to achieve a greater output force (to pinion) than the input force (from motor). This is accomplished by converting the high speed of a hydraulic motor and its relatively low torque into a low
In a rack-and-pinion system, motors drive the gearbox, which in turn drive the main jacking pinion. Motors produce modest torque, which is then multiplied by the gearbox and delivered to the pinion. Depending on the system, motors can be electric or hydraulic. Both have their advantages and drawbacks. Electric jacking motor, gearbox and brake Electric
Backlash in engineering is the distance between the paired gear teeth. It is the amount of ‘play’ or ‘give’ between two mechanical parts that engage each other. Every such part (gear, thread, etc.) has some backlash by design, because without it the two parts would bind up and wouldn’t be able to move. The problem
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
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
The jacking system elevates the hull of the jackup using the attachment points on the leg. They often also support the hull while elevated during operations and storm conditions. There have been different designs in the past, so we will mention a few of them here. Significant features of jacking system: Jacking speed – speed
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