International Science and Technology Journal

This paper aims to study the system of pressure vessels and analyze the stresses the impacts them, which are the mechanical design process how to get any product characteristics before staring manufacturing load types applied to these pressure vessels, investigating the horizontal and vertical pressure vessels and methods to strengthen and support them and analyze the membrane stress clamshell vessels. Generally, elements or the contents of the clamshell for the pressure vessel are the rotary planes axially identical generated by rotating line or arcuate plane, which is called Meridian, around hub. The plane has rotational axes known as meridional plane and closed terminal might be hemisphere, elliptic or conical.
The finite element method (FEM) has been used to analyze the stresses because it provides finite accuracy for investigating the stresses affecting the cylindrical vessel. The results of the analytical study show that the elliptic limits are the most proper limits for the cylindrical vessel due to the fact that its thickness is closed to that of the tank and thus shown more resistance for pressure.