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Perum Graha Garuda Mas Blok II No. 39 Dusun V Desa Sigara-Gara Kecamatan Patumbak Kabupaten Deli Serdang Provinsi Sumatera Utara, Indonesia, Kode Pos: 20361.
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IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA)
Published by CV. IRA PUBLISHING
ISSN : -     EISSN : 29624290     DOI : https://doi.org/10.56862/irajtma
Core Subject : Science, Engineering,
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) fokus pada artikel ilmiah hasil penelitian dan review dalam bidang teknik mesin dan aplikasinya yang antara lain meliputi: 1. Konversi energi 2. Mekanika 3. Material 4. Manufaktur 5. Lain-lain yang relevan
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 221 Documents
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Pengaruh Persentase RDF terhadap Cold Gas Efficiency pada Co-Gasifikasi Batubara Dual Reactor Fluidized Bed Darma, I Wayan Arya; Winaya, I Nyoman Suprapta; Pratama, Yuda I Putu Angga; Irfan, Yunizill
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.424

Abstract

Refuse-derived fuel (RDF) can be used as an alternative fuel through gasification to produce syngas. Co-gasification, which involves blending two or more fuels, has been shown to enhance system performance compared to single-fuel gasification. The addition of RDF with high volatile matter content can improve fuel reactivity and reduce slagging. This study aims to analyze the effect of RDF percentage on coal co-gasification performance in a Dual Reactor Fluidized Bed (DRFB) system. The study demonstrates the relationship between increasing RDF percentage and the enhancement of combustible gas components (CO and H2) and Cold Gas Efficiency. Experiments were conducted with RDF variations of 0%, 5%, 10%, 15%, and 20% of the total fuel mass (0.6 kg). Results show that increasing RDF raises CO from 3.47% to 4.13% and H2 from 2.36% to 2.85%, while CH4 remains relatively constant, leading to an increase in syngas heating value from 2.68 MJ/m3 to 3.07 MJ/m3. Cold Gas Efficiency also increases from 36.21% to 45.04%. Despite a decrease in the heating value of the fuel mixture, enhanced reactivity and improved gasification reactions contribute to better syngas quality and overall system performance.
Evaluasi Kinerja Mesin Kiln Berdasarkan Overall Equipment Effectiveness (OEE) sebagai Dasar Penerapan Total Productive Maintenance (TPM) di PT XYZ Bahri Pratama, Angga; Boangmanalu, Eka Putra Dairi; Sahat, Sahat; Saragi, Jandri Fan HT
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.425

Abstract

The kiln machine demonstrates high operational effectiveness and infrequent breakdowns; however, this performance does not correlate linearly with the resulting product quality. The presence of yield losses—the discrepancy between actual specification-compliant output and total output—indicates production inefficiency, particularly regarding quality. This study aims to analyze the effectiveness of the kiln machine in activated carbon production at PT. XYZ uses the Overall Equipment Effectiveness (OEE) approach and proposes implementing Total Productive Maintenance (TPM) to minimize losses. The methodology involves measuring three primary OEE components: Availability Ratio, Performance Efficiency Ratio, and Rate of Quality Product. Analysis results reveal an average OEE value of 64.1%, which remains significantly below the Japan Institute of Plant Maintenance ideal standard of 85%. This suboptimal OEE value is primarily driven by a low Rate of Quality Product at 56.89% due to high yield losses. By implementing TPM, the company is expected to enhance kiln machine effectiveness through structured maintenance, autonomous operator maintenance, and comprehensive operational quality optimization, thereby improving overall manufacturing productivity.
Analisis Parameter Kinerja Mesin Granulator dalam Proses Produksi Pupuk NPK Tarigan, Nurlianna; Karti, Karti; Silitonga, Nelson; Simanjuntak, Immanuel Yorlando
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.292

Abstract

The process of making NPK fertilizer in granular form is greatly influenced by the performance of the granulator machine used. The granulator plays an important role in producing fertilizer granules with a consistent size, hardness, and homogeneity to meet quality standards and facilitate distribution and field application. This study aims to analyze the performance parameters that affect the efficiency of granule formation in NPK fertilizer and the influence of the granulator on the granule formation process. The research method involved direct observation of the production process and testing the quality of the granules, including particle size distribution, mechanical hardness, and frictional resistance. The results of the study show that, at a granulator rotation speed of 21 rpm and a torque of 28.5 N · m, the NPK fertilizer manufacturing process produces an effective capacity of 24,384 kg/hour. And shows that the more optimal the control of the work parameter settings, the higher the process efficiency and the quality of the NPK fertilizer granules produced.
Perhitungan Neraca Massa pada Sistem Kolom Distilasi dengan Umpan Fatty Acid Tarigan, Ratna Kristina; Nainggolan, Fernando; Sidabutar , Helisa Amanda
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.298

Abstract

Distillation is a separation method used to isolate fatty acid components based on differences in their boiling points. This process is carried out using three distillation columns operating under different pressure and temperature conditions. The first column operates at a pressure of 12–14 mbarA and a temperature of 245–246 °C, the second column at 5–6 mbarA and 247–248 °C, and the third column at 14–15 mbarA and 268–270 °C. The main products from the first and second columns are obtained from the middle fraction, namely the fatty acids FA1698 and FA1865. Meanwhile, the third column is used to separate the heavy-end components (C16, C18, C20, and unidentified compounds) from the residue, forming Mixed Acid Oil (MAO). This study focuses on mass balance analysis to determine the mass flow rates and composition of the bottom fraction in each distillation column. The results show that the first column produces a bottom product of 7092.5 kg/h, with stearic acid (65.53%) and palmitic acid (33.19%) as the dominant components. The second column yields 393.25 kg/h, with the major components being stearic acid (55.02%) and palmitic acid (32.37%). The third column produces an MAO residue of 162.25 kg/h, primarily consisting of stearic acid (48.61%) and palmitic acid (28.88%).
Intensifikasi Produksi Biodiesel dari Minyak Goreng Limbah melalui Teknologi Ultrasonik dengan Optimalisasi Response Surface Methodology Idris, Muhammad; Jufrizal, Jufrizal; Harahap, Uun Novalia; Aldori, Yopan Rahmad; Hermanto, Tino
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.301

Abstract

This study aims to optimize biodiesel production from waste cooking oil using ultrasonic technology combined with Response Surface Methodology (RSM). The investigated variables include the methanol-to-oil molar ratio (6–12), alkaline catalyst concentration (1–3 wt%), and ultrasonic reaction time (480–1440 s). Based on 17 experimental runs, a two-factor interaction (2FI) linear regression model was developed. ANOVA results indicate that all variables significantly affect biodiesel yield (p < 0.05), with catalyst concentration as the most influential factor. The model demonstrates high predictive accuracy (R² = 0.937; adjusted R² = 0.900; MAE = 2.24%; RMSE = 2.84%). Optimization results indicate optimal conditions at a methanol-to-oil ratio of 10.96, a catalyst concentration of 1.03 wt%, and a reaction time of 1414.79 s, yielding 96.84% FAME. Ultrasonic technology effectively enhances mixing and accelerates reactions via cavitation. This study provides practical operational guidance to improve the efficiency of sustainable biodiesel production and support carbon emission reduction.
Stabilitas Termal Material Cast Iron Dan Stainless Steel Pada Proses Penyangraian Terhadap Konsistensi Cita Rasa Kopi House Blend Subakti, Subakti; Raja, Pada Mulia; Lubis, Zulyaden
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.406

Abstract

This study examines the optimization of the physical and sensory characteristics of Arabica and Robusta house blends from Sidamanik by comparing the performance of stainless steel and cast-iron roasting drums. The novelty of this research lies in mapping the influence of material heat retention on roasting profiles and flavor development in specific blend formulations. Using a factorial Completely Randomized Design (CRD), the study tested four blend ratios (100:0, 75:25, 25:75, 0:100) and analyzed parameters including moisture content, defect values, roasting curves, and sensory evaluations via hedonic and cupping tests. The results indicate that cast iron possesses superior thermal stability, significantly accelerating the attainment of the first crack compared to stainless steel. Sensorially, a 100% Arabica formulation roasted in a cast-iron machine produced a superior profile dominated by fruity and sweet characteristics. Conversely, stainless steel was found to better balance flavor complexity in the 25% Arabica and 75% Robusta blend, yielding a harmonious profile of sweet, bitter, and salty notes. These findings underscore that the selection of roasting material must be aligned with the desired blend flavor profile. Consequently, cast iron is recommended for time efficiency and consistent physical quality, whereas stainless steel remains relevant for achieving flavor equilibrium in specific house-blend formulations.
Pemanfaatan Campuran Bunch Ash dan CaCO₃ dalam Proses Claybath untuk Meningkatkan Efisiensi Pemisahan Inti dan Cangkang Kelapa Sawit Rahimah, Rahimah; Irham, Wardatul Husna; Satria, Bagus
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.417

Abstract

The palm oil processing industry requires an efficient kernel-shell separation process to improve product quality and minimize kernel losses. One commonly used method is the claybath system that utilizes the density difference between the kernel and shell using a calcium carbonate (CaCO₃) solution. However, using large amounts of CaCO₃ can increase operational costs and generate waste. This study aims to analyze the effect of combining Bunch Ash (oil palm empty fruit bunch ash) with CaCO₃ on the effectiveness of the claybath process. The research method uses an experimental approach with five mixture compositions: 0:100, 25:75, 50:50, 75:25, and 100:0. The parameters observed include reductions in dirt content and kernel losses. The results showed that a mixture of 25% Bunch Ash and 75% CaCO₃ gave the best results with an average reduction in dirt content of 56.44% and a reduction in losses of around 86.66%. These results indicate that Bunch Ash has the potential to be a partial substitute for CaCO₃ in clay bath systems, thereby increasing process efficiency and supporting the utilization of biomass waste in the palm oil industry.
Analisis Termal Lemari Es dengan Variasi Jenis dan Ketebalan Isolasi di Iklim Tropis Muhammad Azril Rahmaditya; Boni Sena; Farradina Choria Suci; Ihsan naufal firdaus; Faishal Dzaky Al Hakim; Dimas Bahrudin; Ridwan Abdul Hakim; Muhamad Ilham Saputra
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.418

Abstract

Cutting speed is a crucial parameter in the turning process that significantly affects the final quality of the workpiece surface. This study aims to evaluate the impact of cutting speed variations on the surface roughness level of AISI 1018 steel. The machining process was carried out using a chisel with a tip radius of 1.2mm, and the cutting speed was varied at three levels, namely 42m/min, 66m/min, and 105m/min. Surface roughness measurements were carried out using a Surface Roughness Tester. The experimental results showed that increasing cutting speed tended to decrease surface roughness. The lowest roughness value of 2.224 μm was obtained at a cutting speed of 105 m/min. This phenomenon occurs because, at higher cutting speeds, cutting forces and vibrations are reduced, making the machining process more stable and producing better surface quality. This study shows that cutting parameters play an important role in optimizing the final results of conventional turning processes.
Evaluasi Kinerja Pompa Sentrifugal P.100/03 Berdasarkan Head Losses dan Deviasi terhadap Kondisi Desain Umam, Moh Solikhul; Ma’mun, Hisyam; Burhanuddin, Aan
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.420

Abstract

Pumping systems play a pivotal role in crude oil distribution; however, performance studies are often conducted in laboratory settings that often fail to represent actual field operations. This study evaluates the performance of the P.100/03 centrifugal pump in the crude oil distribution system at PPSDM Migas Cepu by comparing actual conditions with design specifications, using head-loss analysis. The methodology employs field studies integrated with technical calculations utilizing operational data, including suction and discharge pressures, flow rates, fluid characteristics, and piping configurations. Key analyzed parameters encompass head losses, total pump head, hydraulic power, and pump efficiency. The results demonstrate a total pump head of 56.78 m. A significant finding reveals a drastic efficiency decline from 60.28% under design conditions to 23.1% in actual operation. This performance degradation is attributed to pump operation deviating from the Best Efficiency Point (BEP), substantial head losses within the piping system, and early indications of cavitation on the suction side. This research underscores that actual operational conditions significantly influence pump performance, necessitating regular evaluations and maintenance to optimize the efficiency of field pumping systems.
Analisis Pengaruh Parameter Pengelasan terhadap Heat Input pada Proses GTAW Multipass Pipa ASTM A36 Maryadi, Maryadi; Zulfikar, Muhammad; Arifiansah, Arifiansah; Farudin, Tugiman
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 1 (2026): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i1.423

Abstract

This research aims to evaluate heat input calculations in multipass Gas Tungsten Arc Welding (GTAW) on ASTM A36 steel pipe. The primary parameters investigated include current, voltage, and welding speed, incorporating a process efficiency factor (η = 0.7). The research methodology employs an experimental approach where heat input values are systematically calculated for each welding layer. The results indicate that increases in current and voltage are directly proportional to the rise in heat input, whereas an increase in welding speed is inversely proportional to it. Specifically, the highest heat input was observed in the root layer at 2.43 kJ/mm, followed by the filler layer (2.20 kJ/mm), capping layer (2.08 kJ/mm), and hot pass layer (2.00 kJ/mm). Metallurgically, these findings indicate that excessive heat input can trigger grain growth in the Heat Affected Zone (HAZ), while insufficient heat input can lead to lack-of-fusion defects. This study significantly contributes to understanding thermal energy distribution across multipass welding layers, providing a fundamental basis for determining optimal parameters to ensure high-quality weld joints.

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