Location: Waterwall

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Appearance Observation Locations Mechanism
Bulging tube adjacent to field weld Bulging tube adjacent to field weld »
Metal thinning on fireside Metal thinning on fireside »
External wastage beneath adherent slag deposit External wastage beneath adherent slag deposit »
ID pitting with corrosion tubercles ID pitting with corrosion tubercles »
Undercut corrosion, multi-color deposits (red, white, black). (This is a view of a tube ID following cleaning.) Undercut corrosion, multi-color deposits (red, white, black). (This is a view of a tube ID following cleaning.) »
Defect at weld bar attachment Defect at weld bar attachment »
Thinning from the fireside, pockmarks on external surface Thinning from the fireside, pockmarks on external surface »
Metal wastage Metal wastage »
Catastrophic failure associated with weld overlay Catastrophic failure associated with weld overlay » »
Circumferential cracking Circumferential cracking » »
Forming lap at tube OD Forming lap at tube OD » »
Fish-mouth opening Fish-mouth opening » »
Thick-lipped rupture, may be very large window missing or a flap hanging by one edge Thick-lipped rupture, may be very large window missing or a flap hanging by one edge
Longitudinal crack at bend Longitudinal crack at bend »
Multiple cracks associated with attachment on outside of tube Multiple cracks associated with attachment on outside of tube » »
Longitudinal ID corrosion-fatigue cracks Longitudinal ID corrosion-fatigue cracks » »
Cracks close to attachments Cracks close to attachments » »
Severe corrosion gouging at a weld-backing ring Severe corrosion gouging at a weld-backing ring »
Bulging tube adjacent to field weld Bulging tube adjacent to field weld »
Appearance Observation Location Mechanism