International Journal of Fluid Machinery and Systems

Korean Society for Fluid machinery (한국유체기계학회)
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Investigation of Corrosion Fatigue Phenomena in Transient Zone and Preventive Coating and Blade Design against Fouling and Corrosive Environment for Mechanical Drive Turbines

  • Hata, Satoshi (Hiroshima Machinery Works Turbomachinery Engineering Department) ;
  • Nagai, Naoyuki (Hiroshima Research & Development Center Mitsubishi Heavy Industries, Ltd.) ;
  • Yasui, Toyoaki (Hiroshima Research & Development Center Mitsubishi Heavy Industries, Ltd.) ;
  • Tsukamoto, Hiroshi (Kyushu Institute of Technology Graduate School of Life Science and Systems Engineering Department of Biological Functions and Engineering Biofluid Mechanics)
  • Received : 2008.06.19
  • Accepted : 2008.10.31
  • Published : 2008.08.01
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Abstract

For mechanical drive steam turbines, the investigation results of corrosion fatigue phenomena in the transient zone are introduced, including basic phenomena on expansion line and actual design and damage experience. These results were analyzed from the standpoint of stress intensity during the start of cracking. In order to resolve such problems, preventive coating and blade design methods against fouling and corrosive environments are developed. Detailed evaluation test results are given for coating performance using a unique test procedure simulating fouling phenomena and washing conditions. Finally, the results of the successful modification of internals and on-line washing results on site are introduced.

Keywords

References

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