2D Axis-Symmetric FEA is a more accurate and intricate method of design verification compared to formulae based calculations. It allows greater insight into the fine detail of flange design, in particular greater detail of seal integrity. It’s also less conservative than calculation method. Analysis is performed in accordance with ASME VIII Div 2 Part 5, considering linear or non-linear stress analysis, fatigue analysis and HISC analysis.
2D Axis-Symmetric FEA is a quick and cost effective method of performing design analysis but it’s slightly compromised because external bending moment has to be considered as an equivalent axial force, torque and shear forces can’t be considered and bolt holes can’t be accurately modelled.