Dew Point Corrosion in Air-preheat Equipment
Acidic process stream
Exfoliation
Flaking of primary surface due to grain boundary
decay
De-Alloy/Alloy Phase
De-zincification
Localized work hardening/ heat treatment
Hydrogen Damage
Environmental cracking
Hydriding
Acidic process stream
Exfoliation
Flaking of primary surface due to grain boundary
decay
De-Alloy/Alloy Phase
De-zincification
Localized work hardening/ heat treatment
Hydrogen Damage
Environmental cracking
Hydriding
| TUBE SUPPORT |
| TUBE SUPPORT |
Cracking
Stress
Stress Corrosion Cracking
Fatigue
Corrosion Fatigue Cracking
Environmental
Stress Corrosion Cracking
Fatigue
Corrosion Fatigue Cracking
Environmental
Under-deposit
Cooling Water
Concentration Cell
Microbially Induced
Sulfate Reducers
Sulfur Oxidizers
Differential Cell Initiated
Cooling Water
Concentration Cell
Microbially Induced
Sulfate Reducers
Sulfur Oxidizers
Differential Cell Initiated
Dew Point Corrosion in Air-preheat Equipment
Acidic process stream
Exfoliation
Flaking of primary surface due to grain boundary
decay
De-Alloy/Alloy Phase
De-zincification
Localized work hardening/ heat treatment
Hydrogen Damage
Environmental cracking
Hydriding
Acidic process stream
Exfoliation
Flaking of primary surface due to grain boundary
decay
De-Alloy/Alloy Phase
De-zincification
Localized work hardening/ heat treatment
Hydrogen Damage
Environmental cracking
Hydriding
Under support corrosion and tube
support ligament damage
Tube to support mechanical/vibration
damage
Fretting – Contact point slip planes
Condensate grooving – Ammonia
support ligament damage
Tube to support mechanical/vibration
damage
Fretting – Contact point slip planes
Condensate grooving – Ammonia
| STEAM |
Tube Related
Localized or General
Shell or Structural Members
Localized or General
Shell or Structural Members
| CUTTING |
| FLOW |
| Flow / Velocity Induced Erosion Entrained Particles : Fly Ash, Sand, Gas Vapor |
| THINNING |
Tube End
Erosion
Corrosion
Erosion
Corrosion
| WASTAGE |
General Wastage
I.D. Detection
O.D. Detection
I.D. Detection
O.D. Detection
| Cracking |
| P |
| ADDITIONAL TYPES |
| PITTING |
| STEAM |
| Impingement |
| Steam |
| Two Phase Cutting Vapor Change Saturated Product |
| WASTAGE |
| I.D. Inner Diameter |
| O.D. Outer Diameter |
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Magnetec
| CORROSION DETECTED |
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COMMON CORROSION TYPES &
MECHANISMS DETECTED
MECHANISMS DETECTED
| PITTING |
Cracking
| g |
| n |
| i |
| i |
| t |
| t |
| Top of Page |
| CUTTING |
| FLOW |
| THINNING |
| NEW PHOTOS of Interest |
| Propylene Condense Weld Failure |
| Click to Enlarge |
Pitting type corrosion due to cooling water
activity. Selective attack in the seam weld.
activity. Selective attack in the seam weld.