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Observation: Cracking » Not Near Weld » Longitudinal

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Observation

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Mechanism

	Appearance	Observation	Locations	Mechanism
	Forming lap at tube OD	Not in or near a weld » Cracking » Longitudinal	Waterwall	Material Defect
	Multiple tight fine cracks	Longitudinal » Not in or near a weld » Cracking	Superheater	Stress Corrosion Cracking
	Fish-mouth opening	Cracking » Longitudinal » Not in or near a weld	Waterwall	Hot Tensile Overload
	Short longitudinal cracks with numerous parallel cracks	Not in or near a weld or attachment » Cracking » Longitudinal	SuperheaterReheater	Long-term Overheat/Creep
	Multitude of cracks parallel to tube	Not in or near a weld or attachment » Cracking » Longitudinal	Superheater	Long-term Overheat/Creep
	Thick-lipped rupture and adjacent longitudinal fissuring	Cracking » Longitudinal » Not Near Weld	ReheaterSuperheater	Creep
	Appearance	Observation	Location	Mechanism