Optimasi Outer Shell Dan Stiffener Pada ISO Tank Dengan Variasi Ketebalan Shell Dan Jarak Stiffener Menggunakan Metode FEM

Abstract

The increasing global demand for clean energy sources has elevated the importance of LNG (Liquefied Natural Gas) transportation systems. ISO Tank containers are commonly used due to their efficiency and safety. The outer shell of an ISO Tank plays a crucial role in maintaining structural integrity under external pressure. This research aims to optimize the design of the outer shell and stiffener configuration by varying shell thickness and stiffener spacing using the Finite Element Method (FEM). Modeling was carried out in SolidWorks and structural analysis was conducted using ANSYS, based on ASME Section VIII Division 1 and ISO 1496 standards. The optimal design obtained consists of an outer shell thickness of 6 mm and stiffener rings with an L profile of 70 mm × 70 mm × 6 mm placed at 834.62 mm intervals. The hydrostatic test results showed that the maximum von Mises stress was 78.36 MPa and the maximum deformation was 0.71126 mm, both below the allowable limit of SA 516 Gr 70 material. This indicates that the design is structurally safe and material-efficient. The study confirms that FEM is an effective tool for optimizing ISO tank design prior to fabrication.