The legislation of the Republic of Croatia stipulates that dizel fuel tanks and dizelbased fuel tanks (heating oil, blue diesel, biodiesel ...) up to a volumetric capacity of 2000 L are not subject to strict legal regulations. Market analysis revealed that there are double-walled vertical tanks with a volumetric capacity of 1500 L and 2100 L, but a tank with a capacity of 2000 L was not found. The rst tank is too small, while the second is subjected to strict legal regulations. In cooperation with Etradex d.o.o. it was decided to construct their own double-walled tank that would meet their needs, and that is a double-walled tank with a capacity of 2000 L. The rst chapter provides a theoretical basis of containers for harmful substances, and a brief description of Diesel fuel. The second chapter briey describes the nite element method and the main groups of nite elements. Also, the theories on which these nite elements are based are briey mentioned and some limitations of these theories are given. The third chapter deals with the verication of nite elements on a simple example of a cylindrical shell lled with water. The discretization with dierent nite elements is considered and the convergence of these elements towards the correct solution is observed. The fourth chapter deals with the numerical and analytical calculation of the simplied geometry of the required nal tank. Some simplications and boundary conditions have been introduced in this chapter to make it possible to carry out the calculation analytically. In the last chapter, only a numerical analysis was performed on the nal geometry of the tank, and the results of this analysis were compared with the results from the previous chapter.