| Appearance | Observation | Locations | Mechanism | |
|---|---|---|---|---|
|
Multiple cracks associated with attachment on outside of tube | Cracking » In or near weld or attachment » Longitudinal or Random | EconomizerWaterwall | Corrosion Fatigue |
|
Longitudinal cracks adjacent to weld | Cracking » In or near weld or attachment » Longitudinal or Random | Superheater | Wrong material/Creep |
| Appearance | Observation | Location | Mechanism |