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

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ANALISIA PENENTUAN UMUR PAKAI TANGKI TIMBUN 01-50 TON DI PT.PLN (PERSERO) UIW MALUKU DAN MALUKU UTARA KANTOR PELAYANAN KIANDARAT Rumaday , Gahsar; Loppies, Leslie. S.; Nanulaitta, Nevada J. M.
Journal Mechanical Engineering Vol. 2 No. 1 (2024): April
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i1.2580

Abstract

In the oil and gas industry, tanks play a crucial role as storage containers for fluids and fuel oil products, both in the form of volatile, pressurized, and flammable fluids. In addition, tanks are not only found in the oil and gas industry, but also in other sectors such as power plants. In the long period of use, the tank may be damaged due to several factors, including plate depletion caused by cor rosion. This problem can affect the integrity of the tank so that an inspection of the condition of the tank needs to be carried out. The inspection of tank plate thickness and corrosion rate was carried out using the Non-Destructive Examination (NDE) method with the Benetech GM100 Ultrasonic Thickness Gaugge tool. This inspection is urgently needed to determine the remaining life of the tank with reference to the API 653 and API 575 standards. The method used started from literature studies in various references and previous research, after which field data collection was then analyzed in accordance with the findings and applicable provisions. Based on the results of measurements in April 2024, the condition of the 01-50 ton tank is still in good condition, marked by the thickness of course 1-3 is still above the minimum limit that has been determined. For Course 1 Tact is 4.3 mm and Tmin is 0.4064 mm with a corrosion rate of 0.0875 mm/year and a remaining life of 44.49 years. For Course 2 Tact is 4.1 mm and Tmin is 0.2032 mm with a corrosion rate of 0.1125 mm/year and a remaining life of 24.63 years. For Course 3 Tact of 3.9 mm and Tmin of 0.1016 mm with a corrosion rate of 0.1375 mm/year and a remaining life of 28.35 years. It can be concluded that the condition of the 01-50 Ton tank is still in good condition. Keywords: (tank, power plant, plate thickness, corrosion rate, remaining tank life)
ANALISA VARIASI KAMPUH DAN ARUS LISTRIK LAS PADA MATERIAL BAJA KARBON MENENGAH TERHADAP KEKUATAN TARIK DAN STRUKTUR MIKRO SAMBUNGAN LAS Lasamahu, Stevanno B D; Huka, Graciadiana I; Nanulaitta, Nevada. JM
Journal Mechanical Engineering Vol. 2 No. 1 (2024): April
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study aimed to investigate the effects of weld groove variations and welding current on the tensile strength and microstructure of medium carbon steel joints using FCAW (Flux-Cored Arc Welding). The researcher employed a quantitative approach with an experimental method. The specimens used in this research include FCAW with V-groove and 90 A current, FCAW with V-groove and 70 A current, FCAW with X-groove and 70 A current, FCAW with X-groove and 90 A current, raw material specimens, and microstructure specimens. The data analysis reveals that the highest average tensile stress value among the welded specimens was 463.50 MPa, observed in the FCAW X-groove with 90 A current specimen, while the FCAW V-groove with 70 A current specimen showed the lowest value at 295.1 MPa. Regarding the strain values, the FCAW X-groove with 90 A current specimen had the lowest average strain of 4.15%, whereas the FCAW V-groove with 70 A current specimen had the highest at 5.36%. In terms of microstructure, the FCAW V-groove with 70 A current specimen exhibited martensite, pearlite, and ferrite structures in the weld zone, and ferrite and pearlite structures in the heat-affected zone (HAZ) and base metal. For the FCAW X-groove with 90 A current specimen, pearlite and ferrite structures were found in the weld zone, HAZ, and base metal. Keywords: Carbon Steel, Weld Groove, Welding Current, Tensile Test, Microstructure
ANALISA PENGARUH VARIASI PUTARAN DAN FEED RATE PADA MESIN FRAIS TERHADAP KEKASARAN PERMUKAAN DAN LAJU KOROSI PADA BAJA KARBON SEDANG Muhammad Jen Latuconsina; Nevada. J. M. Nanulaitta; Josef Matheus; Fredrick Demattacco
Journal Mechanical Engineering Vol. 2 No. 3 (2024): Desember
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i3.2890

Abstract

A milling machine or milling machine is a machine tool used in the manufacturing process to produce components or parts with the desired shape and size. Milling machines have an important role in the oil and gas industry, especially in the manufacture of components used in oil and gas industry equipment such as grooves on shafts and gears used in drilling equipment and oil and gas production are often made of medium carbon steel because of its strength and durability. This study aims to obtain roughness values and corrosion rates on medium carbon steel through the milling process with variations in rotation of 900 rpm and 1100 rpm and feed rates of 42 mm / min and 76 mm / min with dromus cooling media. The results of this study obtained the highest average roughness value at a rotation speed of 900 rpm and a feed rate of 42 mm/minute, which is 6.64 µm (Ra) and 31.1 µm (Rz), while the lowest average roughness value at a rotation speed of 1100 rpm and a feed rate of 42 mm/minute is 6.23 µm (Ra) and 30.8 µm (Rz), for a rotation speed of 1100 rpm and a feed rate of 76 mm/minute is 7.92 µm (Ra) and 37.1 µm (Rz). The higher the rotation speed and the lower the feed rate, the lower the roughness value, and vice versa. The highest corrosion rate is at 900 rpm and 76 mm/minute feed rate, which is 0.02194 (mm/y), while the lowest corrosion rate is at 1100 rpm and 42 mm/minute feed rate, which is 0.01555 (mm/y). The higher the surface roughness, the faster the corrosion rate, and vice versa. Keyword : milling machine, surface roughness, corrosion rate, medium carbon steel
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): Agustus
Publisher : Jurusan Teknik Mesin

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): APRIL
Publisher : Jurusan Teknik Mesin

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): APRIL
Publisher : Jurusan Teknik Mesin

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): DESEMBER
Publisher : Jurusan Teknik Mesin

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): DESEMBER
Publisher : Jurusan Teknik Mesin

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
Co-Authors Agustinus O. Lopuhaa Annafiyah Annafiyah Basri Katjo Berthy Pelasula Berthy Pelasula Clara Sekeroney Cley Talkua Erwin B Pattikayhatu Erwin Bravor Pattikayhatu Erwin Patikayhattu F Demmatacco F. Demmatacco Faizatur Rohmah Frederick Dematacco Fredrick Demattacco Fredrik Demataco Graciadiana I Huka Graciadiana I Huka Graciadiana. I. Huka H. S. Latumaerissa Helen Riupassa Hendry de Fretes Hendry Y. Nanlohy Herman Tjolleng Taba Hermon Latumaerissa Hermon. Latumaerissa Huka, Graciadiana I Huka, Graciadiana. I. 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. 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 Patikayhattu, Erwin Pattikayhatu, Erwin Bravor Patty, Alexander A. 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 Rumaday , Gahsar Semuel M.J.S Tuny Steanly R.R. Pattiselanno