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Observation: Holes, Pits, Gouges » Waterside

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	Appearance	Observation	Locations	Mechanism
	ID pitting with corrosion tubercles	Holes, Pits, Gouges » Waterside	WaterwallReheaterSuperheater	Oxygen Pitting
	sharply defined hole	Holes, Pits, Gouges » Waterside	Economizer	Corrosion Fatigue
	Severe corrosion on side of tube facing gas turbine/duct burners	Holes, Pits, Gouges » Waterside	Evaporator Section	Multiple Under-Deposit Corrosion Mechanisms Including Caustic Gouging, Phosphate Attack, and Hydrogen Damage
	Undercut corrosion, multi-color deposits (red, white, black). (This is a view of a tube ID following cleaning.)	Holes, Pits, Gouges » Waterside	Waterwall	Acid Phosphate Attack
	Thinning on inside of a U-bend or other change in direction	Holes, Pits, Gouges » Waterside	Economizer	Flow Accelerated Corrosion (FAC)
	Appearance	Observation	Location	Mechanism