As a leading global exporter of liquefied natural gas, Indonesia faces substantial logistical challenges in distributing LNG, primarily due to its archipelagic nature. As the primary distribution component, the strength and durability of the LNG ISO tank design for the Mini LNG Carrier is paramount because it must withstand the multifaceted and rigorous demands of multimodal operations spanning land and sea environments. This study examines the fatigue performance of 40-ft ISO LNG tank frame configurations under stationary and dynamic operational loads to obtain optimum strength-to-weight savings. Finite element analysis investigates the fatigue life of 4 proposed LNG tank frame designs under high-cycle and low-cycle conditions, adhering to the ASME and ISO 1496-3 standards guidelines. It can be found that the elimination of longitudinal, vertical, and horizontal frames can effectively reduce stress and displacement and reach 6% total weight saving. The study conclusively shows that in both low and high cycle loading, the fatigue damage factor (FDF) values are below the critical threshold, indicating all proposed frame designs likely achieve a 20-year service life.
Tuswan et al. (Mon,) studied this question.