A semi-submersible rig's ballast system maintains stability by actively compensating for changes in deck load distribution through precise adjustments to the water levels within its pontoons and columns. The ballast system is a network of tanks located in the lower hulls (pontoons) and vertical columns of the rig. These tanks can be filled with or emptied of seawater to alter the rig's center of gravity (CG) and buoyancy. When deck load shifts, for example, when heavy equipment is moved or supplies are loaded/unloaded, th....
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