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Plugged tubes due to fretting cut-like defects.
PHOTO #4 NOTE Defects:
Spiral-wound gasket. As found when bundle was pulled.
Gasket extending into bundle matrix.
Removed gasket section.
In-situ defect. Note defect contour "V" corresponding with gasket surface contour.
60% depth defect. this tube is 2nd row down in bundle tube matrix.
Actual failure. Note deep defect. Gasket section was removed for photo.
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