Study on the Underwater Rotating Apparatus with Changeable Rotating Angle

We proposed the underwater rotating apparatus with changeable rotating angle for the FDSO bottom construction, which includes a pair of arc-shaped base, the hydraulic support, the arc-shaped hydraulic rail, the driving motor, power supply units and the computer. The underwater rotating angle mathematical model was built with the known bottom block division. The apparatus has the features of changeable underwater rotating angle, nondestructive to the FDSO bottom and the semi-submersible barge, low labor intensity when compared with the original apparatus. Finally, the underwater rotating apparatus was successfully applied to build the Sevan Driller FDSO bottom, and the results show the model is correct and valid, which provides an important reference for the FDSO construction.