The tube material is SA-179
The bundle is kept submerged by a wier.
Also the damage was all noted at the final baffle near the U-Bend section of the bundle. There was some damage to the second last baffle similar but not as severe.
I have a 3 year old amine reboiler(kettle type) that experienced a significant tube failure. When the scope of the failure was realized we pulled the bundle for a better look. What we found was on the 5th tube baffle(bundle is approx 20ft long 5 baffles) the tubes were fretted in the baffle...
