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Nevada. J. M. Nanulaitta
Jurusan Teknik Mesin, Politeknik Negeri Ambon
Aerospace Engineering Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics

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ANALISA REMAINING LIFE DAILY STORAGE TANK DI PLTMG SERAM PEAKER 20 MW MASOHI – MALUKU TENGAH Nur Aisyah Utami Kelian; Erwin Patikayhattu; Nevada. J. M. Nanulaitta; Meiti Leatemia
Journal Mechanical Engineering Vol. 2 No. 2 (2024): Journal Mechanical Engineering
Publisher : Department of Mechanical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i2.2911

Abstract

Increased global energy demand has resulted in rapid growth in the oil and gas industry, including in Indonesia. Storage tanks play an important role in the storage of large quantities of liquids and must comply with strict technical standards and government regulations, such as American Petroleum Institute (API) 650, 653, and 575 and Permen of ESDM No. 32 of 2021. Seram Peaker 20 MW Masohi-Maluku Tengah MHP, as a vital asset for providing electrical energy, has a fuel storage tank that has never been inspected since the beginning of its operation. Non-compliance with API 653 standards potentially poses a risk of structural damage, leakage, and disruption to fuel supply. This research identifies the importance of periodic structural integrity evaluation using an Ultrasonic Thickness Gauge GM 100 to measure the decrease in plate thickness due to corrosion and predict the remaining service life of the tank. The results of the calculation show that each course starting from course 1-5 is 109.4 years, 72.3 years, 56.9 years, 43.6 years, 38 years, this shows that the Daily Storage Tank PLTMG Seram Peaker 20 MW Masohi-Central Maluku can operate for the next 38 years. Keywords : Storage Tank, Remaining Life, Inspections, UTG, Corrosion Rate
Pengaruh Variasi Persentase Cangkang Kerang (Caco3) Dan Karbon Arang Kayu Nani Pada Proses Karburasi Terhadap Sifat Mekanis Serta Laju Korosi Baja Karbon Sedang Graciadiana I Huka; Josef Matheus; R.R. Lekatompessy; Nevada J.M Nanulaitta
Journal Mechanical Engineering Vol. 3 No. 1 (2025): Journal Mechanical Engineering
Publisher : Department of Mechanical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v3i1.3348

Abstract

The effect of additives such as seashells (containing CaCO₃) and nani wood charcoal on the mechanical properties of steel during the carburizing process is significant. The addition of CaCO₃ acts as a catalyst, accelerating carbon diffusion into the steel's microstructure, thereby increasing surface hardness and flexural strength. The results showed that increasing the percentage of CaCO₃ up to a certain point can increase the hardness and strength of the steel, with the highest hardness value achieved at a variation of 50% CaCO₃ and 50% nani wood charcoal, at approximately 21.93 HRC. Hardness testing showed that the variation of additives directly affected the final hardness, with the highest value being achieved at the optimal combination of CaCO₃ and nani wood charcoal. In addition to hardness, other mechanical properties, such as bending strength, also showed an increasing trend with increasing CaCO₃ proportions up to the optimal point, namely at a variation of 70% CaCO₃ and 30% nani wood charcoal, which resulted in a bending stress of 32.64 MPa and a bending strength of 3336.14 MPa. Therefore, the adjustment of the proportion of additives is a key factor in optimizing the mechanical properties of steel through the carburizing process enriched with these natural materials. Keywords: seashells, nani wood charcoal, catalyst, a bending strength
Analysis of the Effect of Paint Adhesion and Hardness on the Car Body Painting Process by Varying the Percentage of Paint Mixture Nevada J.M Nanulaitta; Graciadiana I Huka; F Demmatacco; Berthy Pelasula
Journal Mechanical Engineering Vol. 3 No. 1 (2025): Journal Mechanical Engineering
Publisher : Department of Mechanical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v3i1.3351

Abstract

This study aims to analyze the effect of varying paint and thinner mixtures and the number of coats applied on the adhesion and hardness of car paint. The research method used was experimental, varying the paint:thinner ratio (100:110, 100:120, 100:130, and 100:140) and the number of coats applied (2 and 3). Adhesion testing was performed using a Cross-Cut Adhesion Tester, while hardness testing was performed using a Shore D Durometer. The results showed that a paint:thinner ratio of 100:130 provided optimal results for both tested parameters. In the adhesion test, the 100:130 ratio achieved level 5B (best) with no paint peeling, while in the hardness test, it reached the highest value of 88.77 HD. Excessive addition of thinner (ratio 100:140) resulted in a decrease in quality, with adhesion decreasing to level 3B and hardness dropping to 83.3 HD. Variations in the number of coats showed that using two coats provided more consistent results than three coats, especially in terms of adhesion. This study concluded that an optimal balance between paint and thinner is crucial for achieving good paint quality, with a 100:130 ratio providing the best results for automotive body painting applications. Keywords: Automotive Body Painting, Paint Adhesion, Paint Hardness, Paint-Thinner Mixture Variations, Paint Coating
PENGARUH VARIASI CAMPURAN BIODIESEL MINYAK JELANTAH TERHADAP KARAKTERISTIK PEMBAKARAN PADA MESIN DIESEL Berthy Pelasula; R.R Lekatompessy; NJM Nanulaitta; Graciadiana I Huka; Hendry de Fretes
Journal Mechanical Engineering Vol. 3 No. 3 (2025): Journal Mechanical Engineering
Publisher : Department of Mechanical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v3i3.3867

Abstract

This study investigates the transient behavior of internal combustion engines (SI Engine) using various ethanol-gasoline blends (E0 to E10). The research aims to analyze the impact of bioethanol concentration on engine stability across two operational regimes: low speed (1500 RPM) simulating idle conditions and medium speed (2000 RPM) representing transition to workload. The experimental method involved sequential microscopic recording of crankshaft fluctuations at specific intervals. The results demonstrate that at 1500 RPM, E10 significantly improves operational stability, reducing fluctuations to only 10 RPM compared to 60 RPM for E0, due to the oxygenated nature of ethanol. Conversely, at 2000 RPM, higher ethanol concentrations (E8 and E10) lead to performance deficits and unstable combustion phases. This is attributed to the lower heating value (LHV) of ethanol, which results in a 3% to 4% reduction in chemical energy input, and high latent heat of vaporization that causes intake cooling and non-uniform vaporization.  Key word : bioethanol, SI engine, engine stability, fluctuations RPM
Optimalisasi Kekerasan Baja ST-42 Melalui Karburasi Ramah Lingkungan Berbasis Biokarbonat Cangkang Kepiting dan Modulasi Suhu Tempering Semuel M.J.S Tuny; H. S. Latumaerissa; Erwin B Pattikayhatu; Nevada Nanulaitta; Graciadiana I Huka
Journal Mechanical Engineering Vol. 3 No. 3 (2025): Journal Mechanical Engineering
Publisher : Department of Mechanical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v3i3.3871

Abstract

ST-42 low-carbon steel inherently possesses limitations in its surface mechanical properties, particularly regarding hardness and wear resistance. This study aims to enhance the material's functionality through pack carburizing and tempering heat treatments, utilizing the innovation of crab shell waste which is rich in Calcium Carbonate (CaCO3) as a biogenic catalyst to replace the toxic synthetic Barium Carbonate (BaCO3). The carburizing process utilized a mixture of walnut shell charcoal and 30% crab shell powder, followed by rapid quenching in SAE 20-50 oil, and subsequent tempering at varying temperatures from 200°C to 600°C. Hardness was evaluated using the Rockwell (HRC) method. The results demonstrated that the integration of the crab shell catalyst accelerated the Boudouard reaction via massive CO2 emissions, significantly increasing the surface hardness by 22.80% to an average of 138.34, compared to a mere 10.49% increase achieved without a catalyst. During the tempering phase, heating within the 200°C – 400°C range resulted in a marginal hardness decrease due to the formation of fine carbide particles that maintained wear resistance while relaxing residual stresses. Conversely, extreme heating at temperatures between 500°C – 600°C caused a drastic hardness reduction down to 125.325, driven by the dissolution of the rigid martensite structure into a ductile ferrite phase, accompanied by carbon spheroidization. In conclusion, crab shells are highly effective as an eco-friendly energizer that drastically boosts carbon diffusion, while modulating the tempering temperature provides precise control over the material's hardness-to-ductility balance. Keyword : St-42 low-carbon steel, pack carburizing, crab shell, tempering, Rockwell (HRC) method
The Effect of Variation Percentage Alkalization (NaOH) On the Mechanical Properties Analysis and Water Absorption Behaviour in Biocomposite with Cassava Rubber Starch Nevada. J. M. Nanulaitta
Journal Mechanical Engineering Vol. 1 No. 1 (2023): Journal Mechanical Engineering
Publisher : Department of Mechanical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v1i1.1622

Abstract

Composites made using natural ingredients namely sago fiber and cassava rubber starch as the matrix. This composite making is expected to get good bending strength, impact strength and water absorption rate. Composites are made using the hand lay-up method with a variation of the matrix and the variation of the volume fraction of sago pith fibers is 50%: 50% and 70%: 30% using NaOH liquid and distilled water in the alkali process with a percentage ratio of 0%, 5%, 10%, 15% and 20%. soaking time in NaOH liquid for 120 minutes. The results of this study were found to be the best impact value on composites with 50%: 50% fiber volume variation with 15% alkaline NaOH liquid process, the highest value on the energy absorbed by the composite was 7.5479 (J) with an impact strength of 0.0755 (J/mm2) at a variation of 70%: 30% the highest absorption energy is 5,7430 (J) while the impact strength is 0.0574 (J/ mm2) at 15% NaOH liquid percentage. The highest bending strength is 226.035 MPa at 50%: 50% volume fraction variation with 15% NaOH liquid percentage, 70%: 30% fiber volume fraction variation with the highest value 206,199 MPa at 15% NaOH liquid percentage. The best water absorption rate is at 8 , 82% that occurs in the variation of 50%: 50% fiber volume fraction with 15% percentage of the alkaline process NaOH and 9.16% in the variation of 70% fiber volume fraction: 30% fiber with 15% NaOH liquid in the alkalization process Keywords : Sago Pith Fiber, Cassava Rubber Starch, NaOH, Hand Lay Up Method, Bending Strength, Impact Strength and Water Absorption Rate
Analisis Kuantitatif Pengaruh Getaran Mesin Terhadap Umur Fatik Struktur Rangka Dump Truck Kapasitas Besar Pada Kondisi Pembebanan Dinamis Frederik Demmatacco; Nevada Nanulaitta; Graciadiana I Huka
Journal Mechanical Engineering Vol. 4 No. 1 (2026): Journal Mechanical Engineering
Publisher : Department of Mechanical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v4i1.4019

Abstract

Large-capacity dump truck operations in mining environments generate cyclic dynamic loads originating from engine vibration, uneven haul road surfaces, and inertial forces from acceleration and braking, which potentially trigger fatigue damage accumulation in the vehicle chassis frame structure. This study aims to characterize the engine vibration spectral profile, map the dynamic stress distribution at critical frame zones, and quantitatively assess the contribution of engine vibration to fatigue life prediction in an integrated manner. The methodology integrates three primary approaches, namely in-situ vibration measurement based on Power Spectral Density analysis, frequency-domain Finite Element Analysis simulation, and fatigue life prediction utilizing rainflow counting combined with Miner's Rule. Measurement results reveal a peak Power Spectral Density value of 0.0842 g²/Hz under full-load conditions at 2,100 RPM. Numerical simulation confirms a maximum von Mises stress of 487 MPa at the front cross member welded joint, exceeding the material fatigue limit of 310 MPa. Fatigue life prediction at the most critical point reaches approximately 11,494 operational hours, with engine vibration contributing 38.6% of the total accumulated damage. These findings establish engine vibration as the second largest determinant of chassis structural degradation, making engine mounting system optimization and remaining fatigue life-based predictive maintenance the primary recommendations of this research. Keywords: engine vibration; fatigue life; finite element analysis; Miner's Rule; mining dump truck
PENINGKATAN KETAHANAN AUS PERMUKAAN BAJA KONSTRUKSI ST-42 MELALUI SUBSTITUSI ENERGIZER CANGKANG KEPITING (CACO3) PADA PROSES PACK CARBURIZING DAN PENEMPERAN Roy R. Lekatompessy; Erwin B Pattikayhatu; Nevada J.M Nanulaitta; Graciadiana I Huka
Journal Mechanical Engineering Vol. 4 No. 2 (2026): Journal Mechanical Engineering
Publisher : Department of Mechanical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v4i2.4103

Abstract

Low-carbon steel ST-42 is a material widely applied in general mechanical construction, yet it exhibits technical limitations regarding its surface hardness. This study aims to investigate the effect of varying tempering temperatures (200°C, 300°C, 400°C, 500°C, and 600°C) on the hardness value of St-42 steel following a surface hardening process using the pack carburizing method. As an eco-friendly biomaterial innovation, this research substitutes the use of synthetic Barium Carbonate (BaCO3) with crab shell waste which is rich in Calcium Carbonate (CaCO3) acting as a catalyst (energizer), combined with walnut shell carbon powder. A quantitative laboratory experiment was conducted utilizing 15 plate test specimens, where mechanical properties were measured using the Rockwell method (HRC).  The results demonstrated that crab shells operate highly effectively in accelerating carbon diffusion; the average initial hardness of the steel increased drastically from 112.6 HRC to approximately 138.5 HRC post-carburizing and rapid quenching using SAE 20-50 oil. The tempering stage revealed an inversely proportional empirical correlation between temperature and material hardness. Low-temperature tempering (200°C–300°C) successfully maintained hardness retention at around 135 HRC through epsilon carbide precipitation, whereas high-temperature tempering (500°C–600°C) drastically reduced hardness to 125.325 HRC due to cementite spheroidization and carbide agglomeration. In conclusion, crab shell waste serves as a highly reliable alternative energizer, and tempering temperature parameters can be precisely engineered to achieve an optimal equilibrium between surface wear resistance and material toughness for industrial machinery components. Keywords: ST-42 Steel, Pack Carburizing, Crab Shell, Tempering, Rockwell Hardness.
Management of Annual Water Allocation for Irrigation Water Needs in the River Watershed of Kobi-Central Maluku Obednego D. Nara; Ganisa E. Salamena; Nevada J.M. Nanulaitta
Variabel Vol 9, No 1 (2026): APRIL 2026
Publisher : STKIP Singkawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26737/var.v9i1.8369

Abstract

Professional water management is essential to ensure water availability, given its critical importance. In Eastern Indonesia, following the era of rice self-sufficiency, communities have sought to maintain their food supplies and have become accustomed to consuming rice as a staple food. This study aims to describe irrigation water management in the Kobi District of Central Maluku Regency, Eastern Indonesia. The National Rural Electric Cooperative Association (NRECA) method was selected for the analysis, considering three water availability scenarios based on rainfall probability: Wet Scenario (Q30%): High rainfall, Normal Scenario (Q50%): Moderate rainfall, Dry Scenario (Q80%): Low rainfall. In the event of a water deficit, allocations are adjusted according to a priority scale. The correlation (r) between measured water discharge data and simulation results was 0.647, indicating a moderate relationship. The RMSE (mean error) is 0.858, which indicates that this model was quite good. The analysis results revealed variations in water discharge of each scenario for Kobi Irrigation Area and Kobi Watershed. In the Kobi Irrigation Area, the highest discharge occurred in wet conditions, which was 18.42 m³/s in May, while the lowest discharge occurred in dry conditions, which was 1.17 m³/s in May. In the Kobi watershed, the highest discharge occurred in wet conditions, which was 16.75 m³/s in May, while the lowest discharge occurred in dry conditions, which was 0.15 m³/s in May.
Co-Authors Agustinus O. Lopuhaa Alexander Andaria Patty Annafiyah Annafiyah Basri Katjo Berthy Pelasula Berthy Pelasula Clara Sekeroney Cley Talkua Erwin B Pattikayhatu Erwin Patikayhattu F Demmatacco F. Demmatacco Faizatur Rohmah Frederick Dematacco Frederik Demmatacco Fredrick Demattacco Fredrik Demataco Ganisa E. Salamena Graciadiana. I. Huka H. S. Latumaerissa Helen Riupassa Hendry de Fretes Hendry Y. Nanlohy Herman Tjolleng Taba Hermon Latumaerissa Hermon. Latumaerissa Ike Dayi Febriana Imam A Hanifah Josef Matheus Josef Matheus Josef Matheus Julian Salakory Kelian, Nur Aisyah Utami Laily Ulfiyah Lasamahu, Stevanno B D Latuconsina, Muhammad Jen Leatemia, Josua M. Leatemia, Meiti Lekatompessy, Roy R. Lilipaly, Eka Rahmat Mahayani Anthonio Putera Loppies, Leslie S Lukman Hadiwijaya Malakauseya, J. J Marthina Mini Masaki Yamaguchi Matheus, J Meiti Leatemia Mohammad Anas Fikri Muhammad Jen Latuconsina Nanse H. Pattiasina Nur Aisyah Utami Kelian Obednego D. Nara Patikayhattu, Erwin Pattikayhatu, Erwin Bravor Pelasula, Berthy Picanussa, Jovancko. S. S. R.R Lekatompessy R.R. Lekatompessy Ramadhan, Fahri Ratna Ayu Dewi Ratna Ayu Pawestri Kusuma Dewi Rey Joy Toding Padang Roy R Lekatompessy Roy R. Lekatompessy Semuel M.J.S Tuny Steanly R.R. Pattiselanno