One of the outcomes of extensive sloshing studies on partial fillings is the assessment of operational criteria for a138,000 m3 membrane type LNG Carrier subjected to different environmental and navigation conditions that might cause undesired sloshing effects in partly filled tanks. This paper demonstrates the potential for safe operation of this class of vessel with intermediate fillings during the transient phase of LNG transfer. Operating guidance is presented in the form of navigation charts that serve as a guideline for ship operators to avoid critical environmental and navigation conditions while operating the ship in the partially filled condition.

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