Failure of a transfer line on an ethane cracking furnace due to sulfidation
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An Incoloy 800H (UNS N08810) transfer line on the outlet of an ethane-cracking furnace failed during decoking of the furnace tubes after 9 years in service. A metallographic examination using optical and scanning electron microscopy (SEM) as well as energy dispersive X-ray spectroscopy (EDS) revealed that the failure was due to sulfidation. The source of the sulfur in the furnace effluent was either dimethyl disulfide (DMDS), injected into the furnace feed to prevent coke formation and carburization of the furnace tubes, or contamination of the feed with sulfur bearing oil.
Keywordsenergy dispersive spectroscopy Incoloy 800H oxide scales sulphidation thermodynamics
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