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All Journal JURNAL KEBANGSAAN EKSPANSI Ekonis : Jurnal Ekonomi dan Bisnis Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vocatech : Vocational Education and Technology Journal Jurnal Mesin Sains Terapan
Hamdani, Hamdani
Politeknik Negeri Lhokseumawe
Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Analisis kerusakan blade low pressure turbin PLTU Nagan Raya menggunakan metode RCA Mokhamad Gilang Yuniar Rizki; Hamdani Hamdani; Muhammad Razi
Jurnal Mesin Sains Terapan Vol 10, No 2 (2026): JURNAL MESIN SAINS TERAPAN
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jmst.v10i2.10459

Abstract

Steam turbines are essential components in steam power plants, converting thermal energy into mechanical energy to drive generators and produce electricity. Turbine blade damage can reduce efficiency and lead to plant trips, often accompanied by increased bearing vibration. This study investigates the root cause of low-pressure (LP) turbine blade failure at the Nagan Raya Steam Power Plant using the Root Cause Analysis (RCA) method. The results indicate that the failure was initiated by a 150 kV power system disturbance, which generated excessive blade vibration through the combined effects of backpressure and torsional resonance. The resulting cyclic stress exceeded the fatigue strength of the last-stage LP blade (L-0) on the generator side, causing blade fracture. Steam quality analysis confirmed abnormal operating conditions following the unit trip. Dye penetrant and magnetic particle inspections detected no surface cracks, while material composition analysis showed that the blade material met the specified standards. Scanning Electron Microscope (SEM) examination revealed clear evidence of high-cycle fatigue (HCF) at the fracture surface, confirming fatigue as the primary failure mechanism. These findings clarify the failure mechanism and provide recommendations to prevent similar incidents, thereby improving turbine reliability, operational stability, and maintenance strategies in steam power plants.
Co-Authors Abdul Karim Ahmad Zarkasyi Al Fathier Al Fathier Ariefin Ariefin Aura Humayrah Azhar Azhar BAYHAQI BAYHAQI Chairul Fahmi Darmein Darmein Dasmi Husin Dedi Rizaldi Dinia Syangka Edi Saputra Fany Dasari Feri Aulia Hakim Muttaqim Indra Mawardi Jenne Syarif Jufriadi Jufriadi Lianti Lianti Luthfi Luthfi M Nur Hubaizah Haris Marzuki Marzuki Mizan Mizan Mohd. Arkadius Mokhamad Gilang Yuniar Rizki Muhammad Razi Muhammad Riphaldi Nawawi Juhan Nursyidah Rahmi Raihan Rusydi Rusydi Said Herry Syafrizal Saifuddin Saifuddin Samsul Bahri Sariyusda, Sariyusda Siswahyudianto Sumardi Sumardi Teuku Riyadhsyah Zaini Zaini Zulfikar Zulfikar