The weld cracking problem in deaerator systems in the pulp and paper industry (and other industries) has been well defined as corrosion fatigue cracking. In most cases the problem has been sourced to original weld defects and/or operating anomalies. Inspection is critical to find and define the extent of any cracking. Discovery of cracks does not necessarily mean the vessel should be condemned, since weld repairs of deaerator vessels can be successfully made in accordance with proposed NACE guidelines. Where repairs are not feasible or successful, fabrication measures are presented that can produce deaerator vessels that have a very low propensity to crack.

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