LIQUID DYNAMIC LOADS IN LNG CARGO TANKS

This paper presents an evaluation of dynamic sloshing loads in LNG cargo tanks. A comprehensive review of worldwide scale-model sloshing data is presented. The data are reduced to a common format for the purposes of defining design load coefficients. Additional scale-model laboratory experiments are conducted to establish the sloshing dynamic pressure-time histories which are necessary for structural response analysis. Analytical methods are presented which provide techniques for determining wall structural response to dynamic slosh loads. Finally, design methodology is presented for membrane and semimembrane tanks, gravity tanks, and pressure tanks whereby the design procedure sequences from comparing resonant sloshing periods to ship periods, defining the design loads, and designing the tank structures affected by dynamic slosh loads by delineated procedures which vary with tank type.