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Observation: Cracking » Not in or near a weld or attachment

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Mechanism

	Appearance	Observation	Locations	Mechanism
	Circumferential cracking	Cracking » Transverse » Not in or near a weld or attachment	Waterwall	Thermal Fatigue
	Short longitudinal cracks with numerous parallel cracks	Cracking » Longitudinal » Not in or near a weld or attachment	ReheaterSuperheater	Long-term Overheat/Creep
	Multitude of cracks parallel to tube	Cracking » Longitudinal » Not in or near a weld or attachment	Superheater	Long-term Overheat/Creep
	Longitudinal crack at bend	Cracking » Not in or near a weld or attachment	WaterwallReheaterSuperheater	Long-term Overheat
	Appearance	Observation	Location	Mechanism