Update:
Did an analysis of some of the wash from the tube. Had high levels of nickel in the wash, indicating some form of denickelification. The only thing is.. the tube contains no copper, so I am not sure of the mechanism occurring.
We have a customer's calciner tube that is experiencing spot corrosion and leading to holes throughout the tube (when I say throughout I specifically mean radially around zone 2). The composition of the alloy is unknown. The 'exact' chemical composition of the volatile calciner gases is...
