| Appearance | Observation | Locations | Mechanism | |
|---|---|---|---|---|
|
Multiple tight fine cracks | Cracking » Longitudinal » Not in or near a weld | Superheater | Stress Corrosion Cracking |
|
Multitude of cracks parallel to tube | Cracking » Longitudinal » Not in or near a weld or attachment | Superheater | Long-term Overheat/Creep |
| Appearance | Observation | Location | Mechanism |