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The offset is defined as the maximum horizontal displacement due to the combination of current, mean wave drift, and mean wind force. The maximum offset of a semisub depends on a variety of factors, such as water depth, function of the semisub, type of riser etc. For example, a drilling semisubmersible may have no more than 2,5 to 6 % of the water depth, while a oil producing rig with a flexible riser (as opposed to a rigid or hybrid riser) may have an offset of up to 25% of the water depth. |
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