Home » Boiler Tube Failure Handbook » Cracking » Not in or near a weld or attachment Observation: Cracking » Not in or near a weld or attachment Filter Items by: Observation Location 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 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 Longitudinal crack at bend Cracking » Not in or near a weld or attachment WaterwallReheaterSuperheater Long-term Overheat Appearance Observation Location Mechanism