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All Journal Jurnal Locus Penelitian dan Pengabdian Equivalent: Jurnal Ilmiah Sosial Teknik
Fahmi Mubarok
Institut Teknologi Sepuluh Nopember
Aerospace Engineering Automotive Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Mathematics Social Sciences

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Failure Analysis of First-Stage Vane in a GT13E1 Gas Turbine at Combined Cycle Power Plant Mochammad Nafi Khumasi; Fahmi Mubarok
Jurnal Locus Penelitian dan Pengabdian Vol. 5 No. 8 (2026): JURNAL LOCUS: Penelitian dan Pengabdian
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/locus.v5i8.6207

Abstract

The first-stage vane of a GT13E1 gas turbine plays a critical role in directing high-temperature combustion gases toward the rotor blades and therefore operates under severe thermal conditions. During a field inspection at a combined-cycle power plant, significant damage was identified in the vane platform endwall region, including coating degradation, oxidation, and material loss, which resulted in hole formation. The damage was concentrated at the platform endwall corner. This study investigated the damage characteristics and failure mechanism through visual inspection, hardness testing, X-ray fluorescence (XRF) analysis, scanning electron microscopy (SEM), and metallographic examination. The results indicated localized overheating at the platform endwall corner. The silo comb geometry likely promoted secondary flow development and local turbulence, resulting in a non-uniform temperature distribution and the formation of hot spots near the endwall region. Elevated temperatures accelerated thermally grown oxide (TGO) layer formation at the coating interface, leading to thermal barrier coating (TBC) spallation. Subsequent exposure of the nickel-based alloy substrate promoted oxidation, erosion, microstructural degradation, and thermal fatigue crack initiation. Progressive crack propagation eventually caused structural damage to the vane platform. The findings indicate that localized thermal distress associated with secondary flow effects was the dominant failure mechanism and provide insights for inspection planning, cooling system design evaluation, and life management strategies for industrial gas turbine vanes.
Failure Analysis of High Pressure Shaft Pump Sea Water Reverse Osmosis in the Labuhan Angin Generation Business Unit Wandi Pagar Asi Napitupulu; Fahmi Mubarok
Equivalent: Jurnal Ilmiah Sosial Teknik Vol. 8 No. 4 (2026): Equivalent: Jurnal Ilmiah Sosial Teknik
Publisher : Politeknik Siber Cerdika Internasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59261/jequi.v8i4.421

Abstract

Background: UBP Labuhan Angin relies on the high-pressure (HP) pump in the seawater reverse osmosis system to maintain the availability of boiler feedwater and the readiness of the power plant. Repeated shaft failures may disrupt the water-treatment process and compromise the reliability of electricity generation. Objective: This study analyzed the factors contributing to the failure of the HP pump shaft at UBP Labuhan Angin. Methods: The study employed chemical composition testing, macrographic and micrographic examinations, scanning electron microscopy, and Vickers hardness testing. Results: The findings showed that the hardness values of Materials A and B were nonuniform and lower than the reference value for AISI 440A. Material A had a lower carbon content, whereas Material B had a lower chromium content than the specified ranges. Fractographic and microstructural observations indicated brittle fracture, crack initiation in the central area, chromium carbide precipitation, and nonuniform effects of heat treatment. Conclusion: The shaft failure was associated with deviations in chemical composition, insufficient and nonuniform hardness, brittle fracture characteristics, and an inappropriate heat-treatment process, which reduced the material's resistance to cyclic operational loads.
Co-Authors Mochammad Nafi Khumasi Wandi Pagar Asi Napitupulu