Abstract—The structural integrity of generator retaining ring at Dieng geothermal power plant 60 MW has been investigated using NDT method, i.e. visual testing, penetrant testing, ultrasonic testing and crack depth testing. The purpose of this study is to evaluate the integrity of retaining ring without removing the retaining ring from the rotor, because releasing the retaining ring from the generator rotor will eliminate residual stresses therefore the defects are not detected due to residual stress. In addition, this operation has major implications of damage risk, cost, safety and time. The results of the inspection of the above method was not detected the presence of defects on both sides of the retaining ring generator (turbine and exciter side). Therefore, it can be concluded that the retaining ring is not degraded and the service life of components is still appropriate with the specifications of the manufacturer.
Index Terms—Generator retaining ring, structural integrity, NDT inspection, defect.
Imam Djunaedi is with Research Center for Physics, Indonesian Institute of Sciences, Jl. Sangkuriang Komp. LIPI Gd. 80, Bandung, 40135, Indonesia (e-mail: imam_djunaedi@yahoo.com).
Hilman Syaeful Alam is with the Technical Implementation Unit for Instrumentation Development, Indonesian Institute of Sciences, Jl. Sangkuriang Komp. LIPI Gd. 30, Bandung, 40135, Indonesia (e-mail: hilm003@lipi.go.id).
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Cite:Imam Djunaedi and Hilman Syaeful Alam, "In Situ Inspection for Generator Retaining Rings of Geothermal Power Plant 60 MW," Journal of Clean Energy Technologies vol. 3, no. 6, pp. 470-473, 2015.
