Incident XX-028 Cracks in flash tank due to chloride SCC
by mark.brouwer » Thu Nov 16, 2017 1:21 pm
The Incident:
Cracks in a stainless steel flash tank vessel due to carbon steel tracing touching the vessel, marine atmosphere and moisture. As the plant location is close to marine atmosphere, chlorides can accumulate at those locations were carbon steel and stainless steel touches each other leading to Chloride-Stress corrosion cracking of the SS vessel.
The Consequences:
Leak in vessel
The Causes:
The combination of marine atmosphere, CS-SS touching each-other and moisture
The Lessons Learned:
- Assure proper insulation
- Properly install tracing with spacers
- Apply SS tracing
- Apply coating on stainless steel when plant is located in marine atmosphere
Cracks in a stainless steel flash tank vessel due to carbon steel tracing touching the vessel, marine atmosphere and moisture. As the plant location is close to marine atmosphere, chlorides can accumulate at those locations were carbon steel and stainless steel touches each other leading to Chloride-Stress corrosion cracking of the SS vessel.
The Consequences:
Leak in vessel
The Causes:
The combination of marine atmosphere, CS-SS touching each-other and moisture
The Lessons Learned:
- Assure proper insulation
- Properly install tracing with spacers
- Apply SS tracing
- Apply coating on stainless steel when plant is located in marine atmosphere
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