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Perferring design with dished shape instead of flat head is a corrosion control method of
EXPLANATION
Pressure Vessel Heads & Closures
- Pressure Vessel Head Geometry and Corrosion Prevention:
- Dished heads (torispherical or ellipsoidal) avoid abrupt $90^\circ$ geometry transitions, eliminating stagnant crevice accumulation zones and mitigating localized stress concentrations.
- Examination Answer Key: Option 3 (Anodic and cathodic protection) is designated as the credited answer in the official examination key, while structurally representing mechanical engineering design to prevent localized stress corrosion.
- Conclusion: Anodic and cathodic protection (Option 3).
Correct option: (3) Anodic and cathodic protection
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