Based on the three dimensional potential flow theory and non-linear time domain coupling analysis method, the paper studies the effect on FDPSO catenary mooring line tension subjected to wind, wave and current in the South China Sea. With the calculation of wind, wave, and current load applied to the vessel, the FDPSO maximum hydrodynamic response and mooring line tension is calculated. The analysis results indicate that the positioning performance of the FDPSO during drilling in operation sea state and production in survival sea state fulfills design requirements and ensures that the vessel could survive under the most hazardous conditions providing reference to research and engineering design of a multi-point moored FDPSO in the South China Sea. Due to the importance of obtaining an accurate vessel motion response and environmental force, the numerical simulation method is introduced with linearity assumption and experience coefficients defined in the rules. The offshore engineering design software SESAM is used to accomplish the modeling, calculation, and comparison as well as analysis.

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