Found in Part 4, this uses prescriptive formulas for standard geometries, similar to Division 1 but often with lower safety factors. Design-by-Analysis (DBA): Found in Part 5, this allows engineers to use Finite Element Analysis (FEA)
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Self-limiting stress developed by structural discontinuities or thermal expansions. Found in Part 4, this uses prescriptive formulas
| Feature | Div. 1 | Div. 2 | |--------|--------|--------| | Design approach | Design by rules | Design by analysis (FEA) | | Allowable stress | Lower (safety factor ~3.5) | Higher (safety factor ~2.4) | | Fatigue analysis | Not required | Required for cyclic service | | NDE requirements | Basic | More rigorous | | User cost | Lower engineering, higher material | Higher engineering, lower material | | Stamp | "U" | "U2" | 2 | |--------|--------|--------| | Design approach | Design
Division 2 is unique because it integrates advanced computational methods directly into the code requirements. It is divided into two primary design paths: 1. Part 4: Design-by-Rule (DBR)