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09339 Safe Operation of a HTHA Affected DHT Reactor

Picture for 09339 Safe Operation of a HTHA Affected DHT Reactor
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Product Number: 51300-09339-SG
ISBN: 09339 2009 CP
Author: Todd Hynes, Shawn Decker and Gerrit Buchheim
Publication Date: 2009
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High-temperature hydrogen attack (HTHA) is a serious and normally service ending damage mechanism for fixed pressure equipment in the oil refining industry. During a planned routine inspection of a 30-year-old Distillate Hydrotreater reactor considerable HTHA was discovered. This paper discusses the Fitness for Service assessment and management of the vessel with HTHA damage to allow continued safe operation until a replacement reactor could be fabricated and installed. The inspection techniques used, in-service monitoring program implemented, as well as measures taken to mitigate the problem are discussed.

Keywords: HTHA, Hydrogen Attack, FFS, Fitness for Service, Hydrotreater, Cladding, C-0.5Mo
High-temperature hydrogen attack (HTHA) is a serious and normally service ending damage mechanism for fixed pressure equipment in the oil refining industry. During a planned routine inspection of a 30-year-old Distillate Hydrotreater reactor considerable HTHA was discovered. This paper discusses the Fitness for Service assessment and management of the vessel with HTHA damage to allow continued safe operation until a replacement reactor could be fabricated and installed. The inspection techniques used, in-service monitoring program implemented, as well as measures taken to mitigate the problem are discussed.

Keywords: HTHA, Hydrogen Attack, FFS, Fitness for Service, Hydrotreater, Cladding, C-0.5Mo
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