When a vessel or component falls outside the standard design-by-rule envelope — unusual geometry, severe nozzle loads, thermal gradients, or complex internal flow — Roben Manufacturing applies Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD) to validate the design. These analytical tools let us see stresses and flow behavior that code formulas alone cannot capture.
FEA and CFD are not a substitute for sound code design; they are a complement to it. We use them where the physics demands more than a closed-form calculation, giving you confidence that the equipment will perform safely under the real loads and flows it will see in service.
Analysis Where Code Formulas Reach Their Limits
Finite Element Analysis divides a structure into thousands of small elements and solves for stress, strain, and displacement under applied loads. We use FEA to evaluate complex nozzle-to-shell junctions, heavy external piping loads, thermal stresses, and other situations where the prescriptive design-by-rule methods of ASME Section VIII do not fully apply. The results identify peak stresses, confirm acceptable margins, and guide reinforcement where it is actually needed.
Computational Fluid Dynamics models how fluids move and transfer heat inside equipment. We use CFD to study flow distribution across tube bundles, mixing behavior in reactors, residence-time and dead-zone effects, and erosion-prone regions. Understanding the flow field allows us to refine internals such as baffles, distributors, and inlet devices before fabrication.
Used together, FEA and CFD support design-by-analysis decisions: a reactor's internals can be shaped for uniform flow while the shell and nozzles are verified for the resulting mechanical and thermal loads. This integrated view is especially valuable for first-of-a-kind equipment and for troubleshooting existing units that are not performing as expected.
Each analysis is documented with the model assumptions, boundary conditions, and results, so the findings can be reviewed, defended, and incorporated into the equipment record alongside the standard design calculations.
Why Choose Roben Manufacturing
- Design-by-analysis capability. We apply FEA where code design-by-rule formulas do not fully cover the geometry or loading.
- Flow and heat-transfer insight with CFD. CFD reveals flow distribution, mixing, and erosion risks so internals can be refined before fabrication.
- Validated nozzle and external loads. Heavy piping and support loads on nozzles are evaluated so reinforcement is placed where it is genuinely needed.
- Integrated mechanical and flow design. Mechanical and flow analyses inform one another, which is essential for complex reactors and exchangers.
- Documented, defensible results. Every analysis records assumptions, boundary conditions, and outcomes for review and the equipment record.
Key Features & Capabilities
- FEA of nozzle-to-shell junctions and local stresses
- Evaluation of external piping and support loads on nozzles
- Thermal stress and thermal-transient analysis
- Design-by-analysis support outside standard code rules
- CFD of flow distribution across tube bundles
- Mixing, residence-time, and dead-zone studies in reactors
- Erosion- and wear-risk identification
- Optimization of internals: baffles, distributors, inlet devices
- Troubleshooting of underperforming existing equipment
- Documented model assumptions, boundary conditions, and results
Applications & Industries Served
- Reactors with demanding internal flow or mixing requirements
- Heat exchangers with maldistribution or vibration concerns
- Vessels with severe nozzle or support loads
- Equipment subject to thermal cycling or gradients
- First-of-a-kind or non-standard geometries
- Diagnosis of existing units that miss performance targets
Codes, Standards & Quality Assurance
Roben Manufacturing fabricates under a controlled quality system and holds the ASME U Certificate of Authorization, with registration through the National Board of Boiler and Pressure Vessel Inspectors. Every applicable project is supported by material test reports, qualified welding procedures, nondestructive examination records, and complete documentation.
Relevant standards and resources include: ASME Boiler and Pressure Vessel Certification; ASTM International.
Frequently Asked Questions
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