FEA of Carbonyl Reactor Vessel
1. The Engineering Challenge
A high-pressure jacketed carbonyl reactor requires comprehensive FEA under 14 load cases per ASME VIII Div.2, plus nonlinear analysis for critical nozzles N13/N14.
- Shell 3,350 psi at 300°C
- 14 load cases + 2 nonlinear
- Jacketed vessel — dual pressure chambers
- Wind + seismic combinations
- Elastic-plastic analysis for N13/N14
| Parameter | Value |
| Design Code | ASME VIII Div.2 Class 2, Ed. 2023 |
| Shell Design Pressure | 3,350 psi (23.1 MPa) |
| Jacket Design Pressure | 150 psi (1.03 MPa) |
| Design Temperature | 300 °C |
| Shell Operating Pressure | 2,500 psi (17.2 MPa) |
2. FEA Model
Figure 2: Mesh Overview
| Metric | Target | Achieved | Status |
| Aspect Ratio | < 5.0 | 3.05 | ✓ Pass |
| Jacobian Ratio | > 0.5 | 1.08 | ✓ Pass |
| Skewness | < 0.70 | 0.37 | ✓ Pass |
| Element Quality | > 0.1 | 0.68 | ✓ Pass |
3. Results Preview
Figure 3: Nozzle Stress Distribution
Key Takeaways
- All Components PASS: Shell, jacket, bellows, dishends, and nozzles H1/H2 pass across all 14 linear load cases.
- Nonlinear Analysis for N13/N14: Nozzles N13 & N14 exceeded linear PL+Pb+Q limits (468 vs 376 MPa) – elastic-plastic analysis per ASME 5.2.4 achieved convergence, confirming structural adequacy.
- Thermal + Seismic + Wind Combined: 14 load combinations cover steady-state thermal, 0.6×wind, 0.7×seismic, and all ASME Table 5.3 required combinations.
- Jacketed Vessel Design: Separate shell (3,350 psi) and jacket (150 psi) pressures analyzed independently and in combination – bellow stresses well within limits at 296.78 vs 408 MPa
Download the Full Technical Case Study
The full technical report includes:
- Detailed results for all 14 load cases including pressure, thermal, wind, and seismic combinations
- Nonlinear (elastic-plastic) analysis of critical nozzles N13 and N14
- Stress contour plots and results for shell, jacket, bellows, and nozzle regions
- Load combination methodology as per ASME VIII Div.2 requirements
- FEA modeling approach, mesh quality, and boundary conditions
- Validation of results against ASME acceptance criteria
- Code references including ASME Section VIII Division 2 (Part 5 & Table 5.3)