| Appearance | Observation | Locations | Mechanism | |
|---|---|---|---|---|
|
Longitudinal ID corrosion-fatigue cracks | Cracking » In or near weld or attachment » Longitudinal | Waterwall | Corrosion Fatigue |
|
Cracks close to attachments | Cracking » In or near weld or attachment » Longitudinal | Waterwall | Corrosion Fatigue |
| Appearance | Observation | Location | Mechanism |