This study presents results of an experimental study of slosh-induced impact pressures and reaction forces on a 80,000 m3 VLGC (Very Large Gas Carrier) tank. The scale of the model tank was 1/45.5. Experiments were performed with 30% and 70% filling levels. Single and coupled motion tests were carried out. Excitation amplitudes and frequencies were based on the guideline of Lloyd’s Register. For measuring impact pressures and reaction forces, 12 pressure transducers and 48 force transducers were installed on the model. The experimental results showed that coupled pitch and roll motion causes the maximum impact pressures. Heave motion has little effect on impact pressures. The impact pressures of side transducers on the longitudinal tank wall are larger than those of middle transducers which are of the same height. Coupled motion causes larger reaction forces.

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