Under the internal pressure of the main body of the cone of the tapered head, the film stress occurs at the big end. At the junction of the cone and the cylinder, due to the geometric discontinuity and the sudden curvature radius, a large lateral thrust will be generated there, which will cause large edge stress and bend easily, so it needs to be strengthened. For the big end, the axial bending stress is the main controlling factor, and it is the secondary stress, so the stress intensity is controlled; for the small end, the stress condition at the connection between the small end and the cylinder is mainly the average circumferential tensile stress and the average The radial compressive stress belongs to the local membrane stress, so the stress intensity can be controlled. However, because the local membrane stress may exceed the distribution range of the edge effect, for safety reasons, the stress intensity should be controlled within.

For the big end, the thickness of the reinforced section shall not be less than the thickness of the connected cone shell under any circumstances, the length of the reinforced section shall not be less than, and the length of the cylindrical reinforced section shall not be less than. For the small end, the thickness of the reinforced section shall not be less than the thickness of the connected cone shell under any circumstances, the length of the reinforced section of the cone shell shall not be less than, and the length of the cylindrical reinforced section shall not be less than.