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Jurnal Teknologi
Published by Politeknik Negeri Lhokseumawe
ISSN : 14121476     EISSN : 25500961     DOI : http://doi.org/10.30811/teknologi
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Mechanical Engineering
Jurnal Teknologi is a peer-reviewed journal that aims at the publication and dissemination of original research articles on the latest developments in all fields of technology and engineering sciences. The journal publishes original papers in Indonesian and English, which contribute to the understanding of engineering science and the improvement of engineering technology. Papers may be theoretical, experimental, or both, and applied engineering science and technology. The articles submitted to Jurnal Teknologi should be unpublished before and not under consideration for publication elsewhere. The scope of Jurnal Teknologi includes a wide spectrum of technology and engineering science subjects including: Civil engineering; Mechanical engineering; Chemical engineering Electrical engineering; Information and technology; Computer science and engineering; Materials science and engineering; Renewable energy engineering;
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 170 Documents
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Optimasi Formula Blending Produk Marine Fuel Oil Low Sulfur (MFO-LS) untuk Pemenuhan Bahan Bakar Kapal Berstandar International Maritim Organization (IMO) 2020 Dhuha, Fitra; Fauzan, Reza; Rihayat, Teuku
Jurnal Teknologi Vol 26, No 1 (2026): April 2026
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v26i1.8971

Abstract

This study aims to optimize the blending formulation of Marine Fuel Oil Low Sulfur (MFO-LS) to comply with the International Maritime Organization (IMO) 2020 regulation, which limits sulfur content to a maximum of 0.50% m/m. The methodology involves optimization using the Generalized Refining Transportation Marketing Planning System (GRTMPS) software, followed by laboratory validation of four blending formulations. The evaluated parameters include kinematic viscosity, pour point, flash point, density, sulfur content, and other impurities based on ASTM and ISO 8217 standards. The results indicate that not all formulations met the required specifications. Blending 1 exhibited a high pour point issue, while Blending 2 failed to meet the minimum viscosity requirement. The optimal formulation was achieved in Blending 3, which utilized 40% short residue combined with distillate components such as kerosene, LVGO, and HVGO. This formulation successfully met all critical parameters, with a viscosity of 87 mm²/s, pour point of 24°C, flash point of 66°C, and sulfur content of 0.2% m/m. The findings also demonstrate that HVGO can be effectively utilized as a blending component within a 5–10% volume range without compromising product quality. Furthermore, the reformulation improves operational efficiency and economic value by maximizing the utilization of low-value residue streams. Therefore, the proposed blending strategy provides a practical and effective solution to meet global environmental regulations while enhancing the competitiveness of marine fuel products.
Perbandingan Laju Korosi Baja Mild Steel yang Dilapisi Galvanis dan Cat pada Limbah Sawit Izmail, Muhammad Aidil Fitra; Arifin, Fatahul; Rizal, Syamsul
Jurnal Teknologi Vol 26, No 1 (2026): April 2026
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v26i1.8931

Abstract

This study aims to quantitatively compare the corrosion rate of mild steel coated with galvanizing, black spray paint, silver spray paint, and white spray paint when exposed to palm oil mill effluent. The experiment was conducted using the weight loss method in accordance with ASTM G31 standards. Mild steel specimens with dimensions of 150 mm × 25 mm × 2 mm were prepared, coated, and immersed in 4 L of conditioned palm oil wastewater for 22 days. Environmental parameters, including pH (4.5–5.2) and temperature (28–34°C), were continuously monitored throughout the testing period. Each test was performed in triplicate to ensure data reliability. The results indicate that coating type has a significant effect on corrosion resistance. Galvanized specimens exhibited the best performance, with a corrosion rate approaching 0 mm/year and a mass loss of ≤1%. In contrast, black spray-coated specimens showed the highest corrosion rate of 0.77 mm/year and mass loss exceeding 1.8%, followed by silver and white coatings, each with a corrosion rate of 0.26 mm/year. The superior performance of galvanizing is attributed to its sacrificial protection mechanism and the formation of stable passive layers such as ZnO and ZnCO₃, which effectively inhibit corrosion processes. In conclusion, galvanizing is the most effective coating method for protecting mild steel in aggressive environments such as palm oil mill effluent.
Utilization of Bidara Leaf Extract (Ziziphus mauritiana Lamk) as a Body Scrub For Skin Care Yulia, Agna Safira; Dewi, Ratni; Nahar, Nahar; Sari, Ratna
Jurnal Teknologi Vol 26, No 1 (2026): April 2026
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v26i1.8683

Abstract

Body scrub is a skincare product designed to exfoliate dead skin cells. Bidara leaf extract (Ziziphus mauritiana Lamk) was selected for its flavonoid, saponin, and tannin content, which contribute to antibacterial and antioxidant properties, while Epsom salt functions as an exfoliating agent that aids in dead skin removal and enhance skin regeneration. This study involved variations in bidara leaf extract concentration (0–5%) and Epsom salt concentration (10–50%). The formulations were evaluated through physical quality tests, including pH, homogeneity, adhesion, spreadability, organoleptic properties, antibacterial activity, and antioxidant activity. Results indicated that the formulation with 1% bidara leaf extract and 20% Epsom salt yielded the best outcomes, with a pH of 5.2 (compliant with SNI standards for topical preparations), good homogeneity, soft texture, and high panelist acceptance, particularly for sensitive skin. Antibacterial testing revealed the highest activity at 1% extract concentration, with an inhibition zone of 23 mm against Staphylococcus aureus. Antioxidant activity demonstrated free radical inhibition with an IC50 value of 18.94 µg/mL. These findings suggest that body scrub formulations incorporating bidara leaf extract and Epsom salt hold potential as natural, effective, and environmentally friendly skincare products.
Innovation in Liquid Potassium Fertilizer Made from Seawater and Coconut Husk (Cocos nucifera) Rismariam, Siti; Yunus, M.; Irwan, Irwan
Jurnal Teknologi Vol 26, No 1 (2026): April 2026
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v26i1.8480

Abstract

This study innovates a liquid potassium fertilizer utilizing seawater and coconut coir as sustainable and economical alternatives to inorganic fertilizers. The research aimed to investigate the effects of varying maceration times (4, 8, 12, 16, and 20 days) and coconut coir weights (10, 15, 20, 25, and 30 grams) on the characteristics of the resulting fertilizer, specifically its pH, Total Dissolved Solids (TDS), and K₂O content. The production process involved seawater collection and filtration, followed by coconut coir preparation (soaking, drying, size reduction, and weighing). Maceration was then performed using seawater and varied coconut coir weights over different time periods. The liquid fertilizer underwent pH, TDS, and K₂O analyses. Key findings indicate that pH decreased with increased coir weight and maceration time, ranging from 8.47 to 7.33, remaining safe for plants. TDS increased with longer maceration and higher coir amounts, reaching 6000 ppm after 20 days with 30 grams of coir, signifying enhanced dissolved compound extraction. The highest K₂O content of 0.132% was achieved at 16 days of maceration with 30 grams of coconut coir, indicating optimal potassium dissolution. This suggests that a combination of seawater and coconut coir can produce a liquid potassium fertilizer with promising characteristics, offering an eco-friendly and cost-effective agricultural solution.
Strategi Penyesuaian Draft Heater terhadap Konsumsi Fuel Oil dan Emisi Gas Buang pada Heater Nopri, Wendri Eko; Dewi, Ratni; Ridwan, Ridwan
Jurnal Teknologi Vol 26, No 1 (2026): April 2026
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v26i1.8978

Abstract

Optimization of combustion systems in industrial heaters is essential to improve energy efficiency and reduce flue gas emissions. This study aims to analyze the effect of draft heater adjustment on fuel oil consumption and exhaust gas emissions in Heater. The method employed was a field experimental approach using a comparative analysis before and after optimization, through gradual reduction of damper opening and closure of air registers on inactive burners. Observed parameters included fuel oil consumption, excess O₂ levels, stack temperature, heater efficiency, and exhaust gas emissions. The results show that draft optimization significantly reduced fuel oil consumption from 1.1868 m³/h to 0.7345 m³/h, equivalent to a reduction of 38.1%. Heater efficiency increased from 67.35% to 72.26%, influenced by a decrease in excess air from 10.19% to 7.09% and a reduction in stack temperature from 253.5°C to 222.8°C. Furthermore, emissions of CO₂, NOx, and SOx were significantly reduced due to improved combustion quality and lower fuel consumption. This study concludes that draft heater adjustment through damper control and air register optimization is an effective strategy to simultaneously enhance energy efficiency and reduce emissions without requiring major equipment modifications. The findings are expected to serve as a practical reference for improving the performance and environmental sustainability of industrial heater operations..
Pembuatan Biodiesel dari Virgin Red Palm Oil (VRPO) melalui Proses Transesterifikasi dan Penambahan Zat Aditif Minyak Sereh Wangi untuk Meningkatkan Cetane Number Tabriza, Siti Iffat; Harunsyah, Harunsyah; Fachraniah, Fachraniah
Jurnal Teknologi Vol 26, No 1 (2026): April 2026
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v26i1.8958

Abstract

This study aims to analyze the effect of reaction temperature and the addition of citronella oil as an additive on the characteristics of biodiesel produced from Virgin Red Palm Oil (VRPO) through a transesterification process. The reaction temperatures were varied at 50°C, 55°C, 60°C, and 65°C, while the volume of citronella oil ranged from 0 to 10 mL. The evaluated parameters included yield, viscosity, density, flash point, and cetane number. The results showed that increasing the temperature up to 60°C improved the biodiesel yield to 57%, while no significant increase was observed at 65°C due to methanol evaporation. The addition of citronella oil at 2–4 mL effectively increased the cetane number up to approximately 55.9 and improved the physical properties of biodiesel, particularly viscosity and flash point. However, excessive additive concentration (≥6 mL) led to a decline in biodiesel quality due to increased viscosity and reduced mixture homogeneity. GC-MS analysis indicated that the biodiesel was dominated by fatty acid methyl esters such as methyl oleate and methyl palmitate, which contribute to combustion performance and oxidative stability. The optimum condition was achieved at 60°C with the addition of 4 mL citronella oil, producing biodiesel with the best characteristics and potential to meet fuel quality standards.
Analisa Kadar Antosianin pada Bunga Telang sebagai Antibakteri dengan Metode Maserasi Hakim, Rusnia Junita; Adelina, Dina; Mubarok, Zakki Rosmi; Yolandari, Radita Mellya; Romli, Khana Aulia
Jurnal Teknologi Vol 26, No 1 (2026): April 2026
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v26i1.8739

Abstract

Anthocyanins are natural flavonoid pigments widely recognized for their biological activities, including antibacterial properties. Butterfly pea (Clitoria ternatea L.) flowers are known to contain significant levels of anthocyanins; however, the influence of extraction parameters on anthocyanin yield and their correlation with antibacterial activity remains limited. This study aimed to evaluate the effect of ethanol concentration (75%, 80%, and 90%) and maceration time (8, 16, and 24 hours) on total anthocyanin content of fresh butterfly pea flowers and to assess their antibacterial activity. Anthocyanin content was determined using the pH differential method with UV–Vis spectrophotometry at 510 nm and 700 nm. Extraction yield and physicochemical characteristics (pH, viscosity, and density) were also analyzed. The highest extraction yield (1.64%) was obtained using 75% ethanol for 8 hours, while the highest anthocyanin content (1.071 mg/100 g) was achieved with 80% ethanol for 8 hours, corresponding to absorbance values of 1.3425 (pH 1.0) and 1.3365 (pH 4.5). These results indicate that solvent polarity significantly influences anthocyanin extraction efficiency. However, antibacterial testing against Staphylococcus sp. showed only limited inhibition zones under all treatment conditions, suggesting that the extract concentration did not reach the minimum inhibitory concentration (MIC). Overall, while extraction parameters significantly affected anthocyanin content, increased anthocyanin levels did not directly correspond to significant antibacterial activity.
Pengukuran Keandalan Alat Keruk Kapal Isap Produksi Timah 7 Menggunakan Pendekatan Overall Equipment Effectiveness (OEE) Fadhilsyah, Iqbal; Feriadi, Indra; Erwansyah, Erwansyah
Jurnal Teknologi Vol 26, No 1 (2026): April 2026
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v26i1.8423

Abstract

Production Suction Dredger (KIP) are the primary equipment for offshore tin mining, operating with a hydraulic system to drive the dredge, significantly impacting production efficiency. This study aims to measure and analyze the reliability of the dredge at KIP Timah 7 using a partial approach to the Overall Equipment Effectiveness (OEE) method, focusing on two main components: availability and performance. Data were obtained from operational reports for the 2023–2024 period, covering downtime, uptime, and monthly disruptions. The data will be processed monthly to obtain availability and performance values, then combined to calculate OEE as an indicator of work Effectiveness.  The results show that availability fluctuates between 81.30% and 100%, while performance remains constant at 100% because actual operating time meets the ideal target. The OEE value varies following changes in availability each month. The disruption analysis identified the soil pump cardan shaft, soil pump, and press pipe as the most frequently damaged components, increasing downtime. Therefore, scheduled maintenance is required on these critical components to improve work efficiency while minimizing potential production disruptions.
Analisa Kebocoran Pipa Air Pre Heater Boiler Tipe Circulating Fluidized Bed Combustion Unit-2 pada PLTU 2x30 MW PT. XYZ Rizal, Teuku Syamsul; Rihayat, Teuku; Fauzan, Reza
Jurnal Teknologi Vol 26, No 1 (2026): April 2026
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v26i1.8950

Abstract

Tube leakage in the air pre-heater system is a critical issue affecting the reliability and efficiency of coal-fired power plants. This study investigates the causes of tube leakage in the air pre-heater of a Circulating Fluidized Bed Combustion (CFBC) boiler Unit-2 at a 2×30 MW power plant of PT. XYZ. The analysis was conducted through dimensional and thickness measurements, visual inspection, and evaluation of operating conditions, including acid dew point calculation and air preheater performance. The results indicate that wall thinning occurs locally and non-uniformly, with minimum thickness reaching 0.00 mm at certain condition, indicating perforation. The inner diameter remains relatively constant, while the outer diameter and wall thickness decrease significantly, suggesting that degradation predominantly originates from the external surface. Visual observations reveal the presence of pitting corrosion, uniform corrosion, and deposit formation on both outer and inner surfaces of the tube. The calculated acid dew point of flue gas ranges from 128.98 to 129.73°C. At low load conditions, the temperature margin between flue gas outlet and acid dew point becomes very narrow, increasing the risk of acid dew point corrosion. In addition, reduced air preheater performance prior to maintenance contributes to the development of a corrosive environment. It is concluded that tube leakage is mainly caused by progressive external erosion-corrosion, with additional contribution from acid dew point corrosion under certain operating conditions. These findings highlight the importance of temperature control, air preheater performance optimization, and periodic thickness monitoring to prevent recurring failures.
Feasibility and Technical Reliability Study of a Standalone Rooftop Solar Power Plant System Using Python Pvlib: A Case Study on Renewable Energy Engineering Laboratory Building of Universitas Malikussaleh Putra, Shaki S.; Sari, Hermin Kartika; Pratama, Thomas Oka; Putra, Reza
Jurnal Teknologi Vol 26, No 1 (2026): April 2026
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v26i1.8505

Abstract

This study evaluates the technical feasibility and reliability limits of a standalone rooftop solar power plant system for the Renewable Energy Laboratory at Universitas Malikussaleh, North Aceh. Utilizing the pvlib Python library and NASA POWER meteorological data from 2022 to 2024, a high-resolution time series simulation was conducted to model energy yield, battery dynamics, and Loss of Power Supply Probability (LPSP). The results reveal a significant seasonal reliability gap, while the system achieves optimal performance in dry months with LPSP 1%, it suffers critical power failures during the monsoon season, with LPSP peaking at 31.80% in December due to consecutive low irradiance days. Furthermore, the energy balance analysis highlights a system inefficiency where substantial energy curtailment occurs during high-irradiance periods despite severe deficits in wet months. Consequently, a pure off-grid configuration is deemed technically unfeasible for critical laboratory loads without unrealistic oversizing. The study concludes that transitioning to a PV-Hybrid topology with backup generation is essential to ensure operational continuity while complying with current non-export regulatory constraints.

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