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In order to solve the stress problem of ammonia scrubber pressure vessel, this paper proposes the analysis steps using finite element method. The study is a type of vertical pressure vessel used to remove pollutants in ammonia gas. Firstly, the modeling of the vertical pressure vessel geometry was carried out using Autodesk Inventor Professional 2017. Secondly, the meshing was carried out using Autodesk Nastran In-CAD 2017. For the meshing, we used tetrahedral element and we chose the parabolic type element order. Thirdly, the analysis was carried out using Autodesk Nastran In-CAD and based on the design pressure of 0,5 MPa with a volume of 1,21 m 3 . The results showed that the maximum stress occurred in the connection area between the inspection opening and the shell of 333,4 MPa. The maximum displacement occurred in the shell adjacent to the inspection opening was 3,268 mm. Based on ASTM standards on SA 240/A240M Gr 304 material, the maximum strength of material stress was 515 MPa. Finally, theoretical validation was carried out for the entire model, and the results were within the permissible limit.

Step by Step Stress Analysis of Ammonia Scrubber Vertical Pressure Vessel Using Finite Element Method