Calculation problem of cone shells with different thicknesses at the same half vertex angle, please ask

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There is an existing equipment with a design pressure of 2.16Mpa, a design temperature of 130, a diameter of the big end of the cone shell of 2000, and a diameter of the small end of 109. If calculated based on the entire cone, the calculated thickness of the big end transition section of the cone shell and the cone shell connected to the big end transition section is too large, 25.9mm, while the calculated thickness of the small end and small end reinforcement section only needs about 3mm. If the thickness is uniform, the thickness of the small end will be 26. However, if the diameter of the small end is too small and the thickness is too large, it will be difficult to process, so I want to calculate the cone shell segmentally. Here is how I calculated it, first calculate the cone shell as a whole 1: Calculate the thickness of the big end flange and the thickness of the cone connected to the big end flange: 2: Calculate the thickness of the small section and the length and thickness of the reinforced section at the small end. I calculated the 12mm thickness at the middle section directly using the cone shell calculation formula based on the inner diameter of the section. Then I did not consider strengthening the section like the large and small ends of the cone. I don’t know if there is any problem with my calculation like this. Please give me some advice. Thank you.