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Analysis of a failed hot-gas sampler coupling from the IGT HYGAS pilot plant [electronic resource].

Published
Argonne, Ill. : Argonne National Laboratory, 1980.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 23 : digital, PDF file
Additional Creators
Argonne National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
A coupling from a hot-gas sampling line in the HYGAS coal-gasification pilot plant failed after about 8470 hours in service. The coupling was made of RA 330, and was welded to 1.27- and 1.91-cm-OD lines at either end using Inconel 182 weld metal. Failure occurred in the form of intergranular corrosive attack and highly branched cracking from the inner surface of the base metal and interdendritic attack and cracking of the weld metal. The attacked intergranular and interdendritic regions were found to be high in sulfur, which was present both as CrS and Ni/sub 3/S/sub 2/. It was concluded that the coupling failed owing to high-temperature sulfidation, particularly of the high-nickel Inconel 182 weld filler metal, and the consequent formation of the liquid Ni/sub 3/S/sub 2/-nickel eutectic. Continuous water cooling of the coupling to maintain temperatures below those at which significant sulfidation can occur was recommended. Alternatively, the possible use of lower-nickel weld filler metals was suggested.
Report Numbers
E 1.99:anl/msd/fe-80-6
anl/msd/fe-80-6
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Note
Published through SciTech Connect.
10/01/1980.
"anl/msd/fe-80-6"
Diercks, D.R.; Dragel, G.M.
Funding Information
W-31-109-ENG-38
View MARC record | catkey: 13844819