After 20 years of operation, a steam generator's carbon steel piping system failed catastrophically. The failure happened when the system's pressure increased by about 300 psig over its typical operating pressure, but was still 775 psig below the design value. Three failed portions of 2” and 3” pipes at welded connections exhibited diverse failure modes, implying that erosion-corrosion, material deterioration, and weld defects all had a role in the failure. It was also suggested, based on the data, that the failure There were several failure mechanisms involved, including one that started the breakdown and another that eventually destroyed the pieces. The 2′′ elbow's long-term deterioration revealed longitudinal cracks that occurred due to hoop stress, allowing steam to escape into the atmosphere, then moisture from the environment penetrating the crack and assisting in the corrosion process during "down times." The 3” pipeline's weld flaws, which were also harmed by the corrosion process, may
Author (s) DetailsNazim Mohamed
The University of Trinidad and Tobago, Point Lisas Industrial Estate, Point Lisas, Trinidad & Tobago.
Dr. Frank Byron
The University of Trinidad and Tobago, Point Lisas Industrial Estate, Point Lisas, Trinidad & Tobago.
Clément Alexander Imbert
The University of the West Indies, Faculty of Engineering, St. Augustine Campus, Trinidad & Tobago
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