It is becoming clear that roll response of a FPSO may be hazardous if the resonance exits for certain incoming wave field. In several parts of the world this is happening. One manner to control the response is to use stabilizing tanks which is a dynamic absorber. The paper addresses the design of a stabilizing tank on board of a FPSO to control the roll response. It is shown how to use existing storage tanks for that matter. The existing tanks are constantly partially filled and tuned to the natural frequency. This is done by controlling the internal height. The sizing of the stabilizer tank was studied to check the responses and evaluated how sensitive the system is considering the stabilizer tanks. Results from a fully non linear CFD code are compared with frequency domain potential theory one. Subsequently the structural consequences of having a stabilizing tank on board are verified via numerical computations.

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