Materials Technology for Coal-Conversion Processes Quarterly Report: July-September 1978 Page: 58
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Task F -- Component Performance and Failure Analysis (S. Danyluk,
G.M. Dragel, C.A. Youngdah l and L. Pahis)
The activity during this quarter involved examination of com-
ponents from the HYGAS Ash Agglomerating Casihier (AAG) and Liquid
Phase Methanation (LPM) Plant. Follow-up analyses were also conducted on
the failures described in the previous quarterly report. A summary of the
work accomplished in the present quarter is given below.
(1) The LPM plant at HYGAS was damaged by fire in June. Two
block valves that were suspected to have contributed to the cause of the
fire were pressure tested in our laboratory. It was found that the valves
could not sustain the specified 4.1 MPa (600 psi). These results were
reported to Mr. C. Nicholson (DOE) and will be included in his final report.
Since the fire also affected HYGAS piping, several pipe sections were
examined metallographically to make certain that the microstructure of
the piping was not adversely affected. The microstructure of the tubing
that had been exposed to the fire was no different from that of unexposed
piping.
(2) A visit was made to HYGAS to examine cracks in the reactor
cover plate. The cracks are shallow and shavings that include these cracks
are presently being analyzed.
(3) HYGAS of fgas piping has been analyzed. Leaking cracks were
found near welds. A weld-neck flange and a 4-in.-OD pipe have been
examined to date, and the results are as follows: The leaking cracks were
intergranular, and occurred "> 1 cm from the weld fusion line. Trans-
granular cracks were also found near the welds; these were not throughwall
and occurred at random positions relative to the weld fusion line. Both
types of cracks initiated at the ID. Figure 30 shows the morphology of
typical cracks found in the weld-neck flange. The weld-prep areas were
most likely the initiation sites for the intergranular cracks.
(4) Work has started on preparing thermowells of Haynes Alloy 188
for exposure to the AAG environment. Corrosion and erosion will be moni-
tored after controlled exposures.58
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Ellingson, W. A. Materials Technology for Coal-Conversion Processes Quarterly Report: July-September 1978, report, 1978; Argonne, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc283628/m1/68/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.