Sloshing Reduction Using Floating Mat for Floating LNG Cargo Containment System

Abstract

Every effort has been tried for the reduction of sloshing impact loading to the LNG Cargo Containment System (CCS). And, a new type of floating mat system is recently considered for the further sloshing reduction to mitigate the sloshing impact loading in partial filling of the LNG CCS. In this study, model scale sloshing tests are carried out with partial filled tank heights for the comparison of the reduction effects of a new type of floating mat system on the sloshing induced impact loading, and model scale sloshing simulations, using Multi-Material Arbitrary Lagrangian Eulerian (MMALE) formulation and Fluid-Structure Interaction (FSI) analysis technique of LS-DYNA code. The sloshing response results from model scale sloshing tests are applied to validate the sloshing simulations for the extension of diverse model scale sloshing simulations and full scale ones.

Soft metal blanket with optional anti-sloshing conceptual designs to improve pressure control for floating and land-based liquefied natural gas tanks

“…This layer would mimic a blanket to cover the LNG surface. This is similar to the samsung heavy industries (SHI) design for an LNG ABAS blanket involving one-metre cubes of Basotect foam (MarineLink, 2013) used as an anti-sloshing and BOG inhibiting device (Lee et al, 2014(Lee et al, , 2016. The system proposed does not focus on anti-sloshing but on instigating more effective tank pressure management.…”

“…In constrast to the anti-sloshing ABAS Blanket system (MarineLink, 2013;Lee et al, 2014;Lee et al, 2016), the freefloating soft metal blanket (FSMB) concept so far described is not intended to prevent sloshing. As FSRU/FSU typically tend to be moored in sheltered areas, sloshing is not a major operational issue for them.…”

“…The ASFSMB system proposed retains all the advantages of the FSMB and full-scale Effects 1, 2 and 3 for tank pressure control benefit, but is also effective in tackling the sloshing issue in a similar way to the anti boil-off gas anti-slosh(ABGAS) blanket (MarineLink, 2013;Lee et al, 2014Lee et al, , 2016 (Fig. 9), applying different materials and a distinct design concept.…”