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All Journal Jurnal Teknik ITS Journal of Engineering and Technological Sciences Jurnal Teknik Mesin Indonesia EPI International Journal of Engineering JMES: The International Journal of Mechanical Engineering and Sciences Eduvest - Journal of Universal Studies Sewagati
Achmad Syaifudin
Departemen Teknik Mesin, Fakultas Teknologi Industri, Institut Teknologi Sepuluh Nopember
Aerospace Engineering Arts Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Neuroscience Public Health Social Sciences Other

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Numerical Study Effect of Fluidizing Air to Erosion Pattern in Circulating Fluidized Bed Boiler Bambang Sudarmanta; Rizki Mohammad Wijayanto; Giri Nugroho; Achmad Syaifudin; Atok Setiyawan; Julendra B. Ariateja
JMES: The International Journal of Mechanical Engineering and Sciences Vol 1 No 2 (2017)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v1i2.3901

Abstract

Bed material particles in a Circulating Fluidized Bed (CFB) boiler which entrained in the flue gas may cause material degradation due to abrrasive and high velocity impact of particles to wall surface. In this study, Computational Fluid Dynamic (CFD) commercial software with Eulerian multiphase is used to study the erosion pattern in several different fluidizing air velocity. The result obtained from simulation in terms of particles volume fraction and particles velocity in selected area was utilised to predict the erosion rate in several different fluidizing air velocity to achieve the optimal value of fluidizing air velocity. The results obtained in this study are helpful to understand how erosion pattern in CFB boiler, how effect fluidizing air velocity to erosion rate, and also helped to know the potential areas occur erosion so helped to choose suitable material in different region.
Numerical Study of the Effect of Notches on Main Cooling Water Pump Shaft Failure Muhammad Firda Fattahuddian; Achmad Syaifudin
Eduvest - Journal of Universal Studies Vol. 6 No. 8 (2026): Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v6i8.53455

Abstract

The Main Cooling Water Pump (MCWP) is critical in geothermal plants, since failure reduces capacity and increases downtime. This study investigates the fatigue failure of an ASTM A276 Type 316 stainless-steel MCWP shaft at an Indonesian geothermal plant, fractured by a grinding notch from overhaul. The unresolved problem is that the notch was identified only visually, without quantitative stress-concentration, fatigue-life, or numerical validation for repair-radius decisions. A Palmgren–Miner cumulative-damage analysis across startup, steady-state, and shutdown phases shows the baseline notch (r = 0.735 mm; Kts = 3.98) yields Dtotal = 0.6338 at 720 days, while D = 1 requires r ≈ 0.634–0.655 mm, only 14% sharper than baseline. ANSYS Mechanical 2025 R2 simulations across five repair radii (r = 4, 6, 8, 10, 11 mm) revealed a U-shaped Peterson-chart-versus-FEA deviation from a partial-arc effect: since repair depth is limited to 3 mm, the transition-arc fraction drops from 100% at baseline to 48.1% at the largest radius. The novelty of this study is characterizing this partial-arc mechanism quantitatively, distinct from the r/d-based chart deviations reported in prior work. For maintenance and asset management, stress reduction increases with radius up to r = 11 mm, while r = 6 mm marks the smallest chart-to-FEA deviation, which grows again at larger radii; a 0.1 mm radius change shifts damage from 63% to 100% of life, precise enough to guide repair-radius and inspection intervals. By quantifying this partial-arc limit on chart reliability, the study gives maintenance engineers a defensible, data-driven basis for repair-radius selection.
Co-Authors Abdul Rohman Farid Abdul Rohman Farid Agus Sigit Pramono Andhika Muttaqien Priyambodo Atok Setiyawan Bambang Sudarmanta Betti Mawar Kalista Dinny Harnany Faisal Rahman Giri Nugroho I Nyoman Sutantra Julendra B. Ariateja Julendra Bambang Ariatedja Karisma Rizal Katsuhiko Sasaki Katsuhiko Sasaki Katsuhiko Sasaki Lanang Wahyu Pamungkas Lanang Wahyu Pamungkas Muhammad Firda Fattahuddian Muhammad Khoirul Effendi Rizki Mohammad Wijayanto Ryo Takeda Ryo Takeda Ryo Takeda Teguh Suprianto Teguh Suprianto Windharto, Agus Yohanes Yukiko Tomooka Yusuf Kaelani