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This paper describes three corrosion case histories caused by overconfidence and lack of thorough understanding of the corroding systems. 1. Exchanger tube failure. 2. Hydrogen induced cracking. 3. Inappropriate mixing of process streams.
This paper describes three corrosion case histories caused by overconfidence and lack of thorough understanding of the corroding systems. The first case history is exchanger tube failure from excessive high temperature sulfidation caused by changes of operation condition, run length and cleaning interval. The second case is about presumably hydrogen induced cracking(HIC) and high temperature hydrogen attack(HTHA) during weld repair and heat treatment in wet sour service. Inappropriate mixing of process streams was the cause of failure discussed in the third case history.
Keywords : High Temperature Sulfidation, Vapor Phase Corrosion, Fouling, HIC, HTHA, Sulfuric Acid, Mixing Point
Under-deposit corrosion is a common mode of failure in boiler tubes. Mechanisms include phosphate attack, caustic gouging, hydrogen damage, and wall thinning due to metal loss. Many aspects of these mechanisms and their mitigation are well-understood, while certain specific details remain uncertain or subject to controversy.
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Background on High Temperature Hydrogen Attack (HTHA). Some current developments in HTHA inspection and mitigation. How several refiners have instituted an HTHA risk management plan for their refineries and the challenges and pitfalls they have encountered
There is an ongoing Joint Industry Program on the development of high temperature hydrogen attack (HTHA) remaining life assessment and evaluation of non-destructive examination technologies. HTHA model development and assessment examples will be discussed.