Response-Based Evaluation of Design Sloshing Loads for Membrane-Type LNG Carriers

Abstract

Sloshing model test and dynamic structural analysis of a membrane-type LNG tank is performed to determine design sloshing loads for LNG containment system. Spatial, temporal and statistical characteristics of the measured sloshing loads are investigated. Dynamic structural analysis of a LNG containment system is performed to obtain structural responses at predefined critical locations under short duration triangular pulse, which is referred to as triangular impulse response function (TIRF). The TIRFs are synthesized with time history of measured sloshing loads to obtain dynamic response of the LNG containment system. Statistical analysis of peak stress values are used as basis of determining design sloshing loads for the structural assessment of LNG containment system.