Crevice-Corrosion Failure of Evaporator Tubes Because of Defective Seam Welds
Several tubes in a tube bundle in an evaporator used to concentrate an acid nitrate solution failed by leakage. The feed to the evaporator contained about 6% nitrate, and the discharge about 60% nitrate. The tube bundle was comprised of type 309S (Nb) stainless steel drawn-and-welded tubes expanded and welded into two type 304L stainless steel tube sheets. The tubes failed by crevice corrosion. The failed tubes were defective as-received, and the establishment of concentration cells within the longitudinal cracks in the seam welds led to ultimate corrosive penetration of the wall. There was no evidence of crevice corrosion...
Crevice-Corrosion Failure of Evaporator Tubes Because of Defective Seam Welds, ASM Failure Analysis Case Histories: Chemical Processing Equipment, ASM International, 2019, https://doi.org/10.31399/asm.fach.chem.c0047611
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