Code Calculations vs FEA for CRN Applications: When to Use Each

A common question in CRN project planning: when should we use standard code calculations, and when is FEA necessary? The answer depends on geometry complexity, design pressure, consequence of rejection, and schedule. Kopfkino helps clients select the most appropriate analysis method for each CRN project.

Standard Code Calculations: Best For

• Standard cylindrical shells, elliptical and hemispherical heads
• Nozzles within the D/t and d/D limits of ASME UG-37
• Saddle-supported horizontal vessels per Zick method
• Simple heat exchangers with standard TEMA configurations

FEA: When It Adds Value

• Division 2 designs with higher allowable stresses but more rigorous analysis
• Nozzles outside ASME UG-37 applicability limits
• Non-standard head geometries
• High-pressure vessels where wall thickness optimization provides material savings
• Fatigue-critical equipment requiring stress concentration factors

Frequently Asked Questions

Is FEA always accepted by Canadian authorities instead of code calculations?

Yes. All Canadian authorities accept FEA per ASME VIII Division 2 methodology. However, the FEA report must be thorough and properly documented.