Stress Corrosion Cracking in the Ammonia Refrigeration Indus
Stress Corrosion Cracking in the Ammonia Refrigeration Industry (2007)-Stress corrosion cracking (SCC) can occur on the inner surface of steel pressure vessels subjected to tensile stress, such as near major welds, in the presence of ammonia and oxygen. Such cracks may propagate through the vessel wall to create a pinhole leak, although cracks this severe are very uncommon in refrigeration applications. The paper reviews case studies of specific instances of known SCC, discussing failure modes, vessel applications, metallurgical analysis results, and methods of resolution. Finally, the paper presents methods of inhibiting SCC and makes specific recommendations for designing and inspecting vessels, and for repairing vessels that have experienced SCC.
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