| Appearance | Observation | Locations | Mechanism | |
|---|---|---|---|---|
|
Catastrophic failure associated with weld overlay | Cracking » In or near weld or attachment » Transverse | Waterwall | Hydrogen Damage |
|
Thick-lipped rupture, may be very large window missing or a flap hanging by one edge | Holes, Pits, Gouges | Waterwall | Hydrogen Damage |
| Appearance | Observation | Location | Mechanism |