Finite Element Analysis (FEA) of Inlet Nozzle

Finite Element Analysis (FEA) of Inlet Nozzle N1 to evaluate stress distribution at the nozzle-to-shell junction under operating conditions as per ASME standards.

Finite Element Analysis (FEA) of Inlet Nozzle N1 has been carried out to evaluate the stress distribution at the nozzle-to-shell junction and to ensure structural integrity under operating conditions. The analysis is performed in accordance with ASME Section VIII, Division 1 (Edition 2023) and follows the guidelines of ASME Section VIII, Division 2, Part 5.2 for protection against plastic collapse. Stress evaluation is conducted using the equivalent (von Mises) stress criterion and compared with allowable limits as specified in ASME Section VIII, Division 2, 

A detailed three-dimensional model of the pressure vessel with the inlet nozzle is developed using SolidWorks 2019, and the finite element analysis is carried out using ANSYS Workbench 19.2. The model includes the vessel shell, nozzle, and flange connection to accurately represent the actual geometry. A high-quality finite element mesh is generated, with mesh refinement applied at the nozzle junction to capture stress concentration effects with greater accuracy.

The analysis considers various loading and boundary conditions, including internal pressure (MAWP), nozzle loads such as forces and moments, nozzle thrust, and appropriate support constraints. The results obtained from the analysis indicate that the maximum stress occurs at the nozzle-to-shell junction, as shown in the stress contour plot. These stress values are compared with the allowable limits defined by ASME standards to assess the safety of the design.

Based on the analysis, the critical stress region is identified at the nozzle junction, and the design is evaluated for structural adequacy under the applied loading conditions. The results confirm that the methodology, including modeling, meshing, loading conditions, and evaluation criteria, provides a reliable assessment of the nozzle performance.

The figure shows the equivalent (von Mises) stress distribution for Inlet Nozzle N1, highlighting the maximum stress location at the nozzle-to-shell junction.