After several catastrophic deaerator failures in the 1970s and 80s, a NACE task group was formed to conduct an organized, in-depth study into the causes of the ruptures. The major accomplishment of this group was developing NACE standard RP0590 (now SP0590) “Recommended Practice for Prevention, Detection, and Corrosion of Deaerator Cracking,” which was first released in 1990. Almost thirty years later, there are still serious damages occurring in deaerators and they still rupture from time to time. This paper discusses the damage mechanisms that are still occurring and what concerns are still relevant today. One issue is that flow-accelerated corrosion is a much more prominent mechanism now than it was during the initial studies. Another is why deaerators operated for 60 years before they began to fail. Case studies are presented from the power and pulp and paper industries.

Subject
Corrosion fatigue, Water, Materials, Heaters, Inspection, Corrosion cracking, Repair, Storage tanks, Case studies, Deaerators, Stainless steel, Steam, Damage
Keywords:
deaerator, corrosion fatigue, flow accelerated corrosion, boiler equipment
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2019
Association for Materials Protection and Performance (AMPP)
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