[vc_row][vc_column][vc_custom_heading text=\”Exfoliation & Lamellar Corrosion\” use_theme_fonts=\”yes\”][vc_custom_heading text=\”During Inspection\” font_container=\”tag:h3|text_align:left\” use_theme_fonts=\”yes\”][vc_column_text]
Severe leakages in a steam generator superheater were the leading cause of a major outage a few months after first operation of a power plant. In the course of a visual inspection, the first section of the superheater was observed to develop several sharp perforations, impingement and general abrasion on the baffle/tube interface.
Heavy deposits were also found all over the steam drum along with serious surface exfoliation.
[/vc_column_text][vc_custom_heading text=\”Conclusions\” font_container=\”tag:h3|text_align:left\” use_theme_fonts=\”yes\”][vc_column_text]
Failure investigation was conducted to reveal that unsatisfactory chemical cleaning left a heterogeneous layer of calcium carbonate, sodium phosphate, silica and iron citrate.
This layer inhibited the formation of a consistent magnetite layer that was partially developed across the surface.
As a result, scales detached from surface and passed to steam side leading to significant damage in the superheater and dramatic consequences to the project.
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