Escort Tug Safety; are we there yet?
Building on recent industry-wide discussions, this presentation examines the range of dynamic scenarios possible during escort tug operations, such as loss of towline or thrust and transitional manoeuvres, and how they relate to present stability criteria based on ‘idealized’ zero-speed residual righting energy. Using CFD, it can be shown how actual residual righting energy can be affected by escort hydrodynamics at speed. It is also demonstrated how numerical simulation enables the prediction of how well an active escort winch reduces escort tug motions in seas. Finally, a collaborative path is proposed toward improving criteria for escort tug design and operations that account for ‘real-world’ dynamics.