| Appearance | Observation | Locations | Mechanism | |
|---|---|---|---|---|
|
Metal thinning on fireside | Deformation » Thinning | SuperheaterWaterwall | Smelt/Slag Attack |
|
Fine cracks around studs | Cracking » Not in or near a weld » Transverse | Studded Waterwall | Thermal Fatigue |
|
Multiple cracks associated with attachment on outside of tube | Cracking » In or near weld or attachment » Longitudinal or Random | EconomizerWaterwall | Corrosion Fatigue |
| Appearance | Observation | Location | Mechanism |