Creep damage assessment of a 50 MW steam turbine shaft

This paper reported the evaluation of a 50 MW steam turbine shaft that has exceeded the designed lifetime (30 years). The inspection of turbine is a mandatory for safety and continued reliable operation. The shaft was made of nickel-chromium-molybdenum alloy steel. The turbine operated in the range...

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Bibliographic Details
Published inMATEC Web of Conferences Vol. 34; p. 5002
Main Authors Nurbanasari, Meilinda, Suratman, Rochim
Format Journal Article Conference Proceeding
LanguageEnglish
Published Les Ulis EDP Sciences 01.01.2015
Subjects
Creep (materials)
Damage assessment
Grain boundaries
Inspection
Life assessment
Molybdenum base alloys
Nickel chromium molybdenum steels
Nickel chromium steels
Steam turbines
Turbines
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Summary:This paper reported the evaluation of a 50 MW steam turbine shaft that has exceeded the designed lifetime (30 years). The inspection of turbine is a mandatory for safety and continued reliable operation. The shaft was made of nickel-chromium-molybdenum alloy steel. The turbine operated in the range temperature of 500-600 oC, and creep was considered to be a major damage mechanism. The remaining life assessment of the turbine shaft was also conducted using replication technique. The replica samples were taken from 125 position distributed along the turbine shaft. The microstructural analysa of replicas showed that creep had occurred, which was indicated by the cavities formation at the grain boundaries. After evaluation and assessment, it can be concluded that the turbine shaft still can be used however it needs to be re-inspected within 6 months.
ISSN:2261-236X
2274-7214
2261-236X
DOI:10.1051/matecconf/20153405002