Observation: Holes, Pits, Gouges

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Mechanism
Appearance Observation Locations Mechanism
General pitting General pitting »
ID pitting with corrosion tubercles ID pitting with corrosion tubercles »
sharply defined hole sharply defined hole »
Severe corrosion on side of tube facing gas turbine/duct burners Severe corrosion on side of tube facing gas turbine/duct burners »
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.) »
Thinning on inside of a U-bend or other change in direction Thinning on inside of a U-bend or other change in direction »
Defect at weld bar attachment Defect at weld bar attachment »
Porosity in weld Porosity in weld »
Thinning from the fireside, pockmarks on external surface Thinning from the fireside, pockmarks on external surface »
Metal wastage Metal wastage »
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
Deformation and perforation from the outside in Deformation and perforation from the outside in »
Severe corrosion gouging at a weld-backing ring Severe corrosion gouging at a weld-backing ring »
Severe pock-marked corrosion on fireside Severe pock-marked corrosion on fireside
Appearance Observation Location Mechanism