<p>This paper focuses on a comparative study of free vibration analysis of stainless steel and GFRP composite pressure vessels and offers valuable insights into optimizing material selection and design in shipbuilding for enhanced performance and structural integrity. The study aims to investigate the natural frequencies of these structures under different conditions. Utilizing finite element analysis (FEA), modal analysis techniques are employed to evaluate the vibrational modes and frequencies of both isotropic and orthotropic pressure vessels. The influence of material anisotropy on the vibrational response is explored, highlighting differences in modal shapes and natural frequencies between isotropic and orthotropic configurations. The results provide valuable insights into the structural dynamics of pressure vessels, essential for enhancing their design and performance in various engineering applications.</p>