Home » Boiler Tube Failure Handbook » Reheater Location: Reheater Appearance Observation Locations Mechanism External thinning, smooth areas Deformation » Thinning Reheater Fireside Corrosion/Erosion Smooth surface Deformation » Thinning ReheaterSuperheater Fly Ash Erosion ID pitting with corrosion tubercles Holes, Pits, Gouges » Waterside ReheaterSuperheaterWaterwall Oxygen Pitting Fish-mouth rupture Cracking » Not in or near a weld ReheaterSuperheater Short-Term Overheat Short longitudinal cracks with numerous parallel cracks Cracking » Longitudinal » Not in or near a weld or attachment ReheaterSuperheater Long-term Overheat/Creep Longitudinal crack at bend Cracking » Not in or near a weld or attachment ReheaterSuperheaterWaterwall Long-term Overheat Brittle fracture in heat affected zone of a weld Cracking » In or near weld or attachment » Transverse or Random ReheaterSuperheater Graphitization Thick-lipped rupture and adjacent longitudinal fissuring Cracking » Longitudinal » Not Near Weld ReheaterSuperheater Creep Deformation and perforation from the outside in Fire/Gas Side » Holes, Pits, Gouges Reheater Mechanical damage Appearance Observation Location Mechanism