In fact ther is several colums with corrosion problems.
Some corrosions are veru extended in the skirt and not in the welds.
Ex:
Column 6201A
Diam :5029 mm
Area 90 m2
Thickness:19.05+ 3.00 mm
Weight empty :115 000 kg
Weight (full of water): 485 000 Kg
Material : A 515 Gr 70
Wind : 70 DaN/m2...