The alloy construction of reheat tubes was being attacked by the flue gas after wet scrubbing. The apparent problem is that the coal being burned is high in chlorides — 0.03% by weight — resulting in a huge spike (10X) in slurry chlorides around 12000 ppm. The 316 L outlet reheater tubing is showing pitting from chlorides in the flue gas. Internal water temp is 200°F in the tubes with external flue gas at 180°F. Steam at 600°F is sprayed i

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