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JUVOTEK JURNAL: Jurnal Vokasi Teknik
Published by CV. Medan Tekno Solusi
ISSN : 30251125     EISSN : 30251125     DOI : 10.67922/juvotek
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering
JUVOTEK JURNAL: Jurnal Vokasi Teknik (JuVoTek) is a peer-reviewed, open-access scientific journal that publishes original and high-quality research in vocational engineering, applied technology, and multidisciplinary engineering studies. The journal provides an academic platform for researchers, lecturers, engineers, practitioners, students, and policymakers to disseminate innovative findings and practical solutions to contemporary engineering and technological challenges. JuVoTek emphasizes the integration of theoretical knowledge, technological innovation, industrial applications, vocational education, and sustainable engineering practices. The journal welcomes empirical studies, experimental research, applied research, development studies, review articles, case studies, and conceptual papers that contribute to the advancement of engineering science and vocational technology. Subject Areas Mechanical Engineering Chemical Engineering Electrical and Electronic Engineering Civil Engineering Industrial and Manufacturing Engineering Informatics and Computer Engineering Mechatronics and Automation Instrumentation and Control Systems Materials Science and Engineering Energy and Renewable Energy Systems Artificial Intelligence and Engineering Applications Internet of Things (IoT) and Embedded Systems Robotics and Autonomous Systems Production Engineering and Quality Systems Environmental Engineering Engineering Management Engineering Education
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 175 Documents
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Calculations of Mass Balance and Energy Balance in Oil Vacuum Dryer at PT.XYZ Pratama Saragih, Koko; Frananta Simatupang, Dimas; Hasiholan Valentinus Putra Abhel Halawa, Manotona
JURNAL VOKASI TEKNIK Vol 4 No 1 (2026): JURNAL VOKASI TEKNIK (JUVOTEK)
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

Pengamatan dilakukan di PT. XYZ dengan kapasitas pabrik 60 ton/jam. Penelitian ini bertujuan untuk menganalisis neraca massa dan neraca energi pada unit vacuum dryer dalam proses pengeringan crude palm oil (CPO). Perhitungan neraca massa dilakukan berdasarkan kapasitas alat vacuum dryer sebesar 10 ton/jam, dengan fokus pada kesetimbangan antara jumlah bahan yang masuk dan keluar, termasuk komposisi minyak, air dan kotoran. Dari data yang dianalisis diketahui bahwa rata-rata kadar air pada CPO setelah pengeringan berada pada kisaran 0,19-0,24%, dengan 1 data yang memenuhi kriteria kadar air ≤ 0,2%. Proses pengeringan menghasilkan uap sebesar 41,10 Kg/jam dengan efisiensi alat mencapai 70%. Sementara itu perhitungan neraca energi yang masuk dan keluar, memiliki rata-rata energi yang masuk sebesar 215.040,43 kkal/jam dan energi yang butuhkan untuk pengeringan CPO sebesar 61.019,53 kkal/jam. Hasil ini menunjukkan vacuum dryer mampu bekerja secara sefisien dalam menjaga keseimbangan massa dan energi serta mendekati target kadar air yang diinginkan pada produk.
Maintenance Berkala Genset 500 KVA di PT Pertamina RJBT 4 Firmansyah, Galih Rendi
JURNAL VOKASI TEKNIK Vol 4 No 1 (2026): JURNAL VOKASI TEKNIK (JUVOTEK)
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

Genset diesel berkapasitas 500 kVA merupakan salah satu peralatan utama penunjang keandalan pasokan listrik pada sektor industri. Untuk menjaga kinerja dan umur pakai genset, diperlukan kegiatan maintenance berkala yang terencana dan sesuai standar. Penelitian ini membahas pelaksanaan maintenance berkala genset diesel 500 kVA di PT Pertamina RJBT 4 yang meliputi pemeriksaan sistem bahan bakar, sistem pelumasan, sistem pendingin, serta pengecekan kondisi umum mesin. Metode yang digunakan adalah observasi langsung di lapangan, pengumpulan data teknis, dan studi dokumentasi prosedur perawatan. Hasil kegiatan menunjukkan bahwa maintenance berkala mampu meningkatkan keandalan operasi genset, mencegah terjadinya gangguan mendadak, serta menjaga performa mesin tetap optimal. Dengan penerapan maintenance yang tepat, risiko kerusakan dapat diminimalkan dan kontinuitas operasional perusahaan dapat terjaga.
ANALISA EFISIENSI MOTOR BAKAR DIESEL TRAKNUS TYPE PL 500 P UNTUK MENGGERAKKAN GENERATOR DI PT UNKINDO BLANKAHAN OIL MILL Batubara, Antonius; Supriadi; Suardi
JURNAL VOKASI TEKNIK Vol 4 No 1 (2026): JURNAL VOKASI TEKNIK (JUVOTEK)
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

Penelitian ini bertujuan untuk menganalisis kinerja mesin melalui parameter daya indikator, daya efektif, efisiensi mekanis, dan efisiensi termal pada variasi beban dan putaran. Pengujian dilakukan dengan beban antara 355,95 kW hingga 370,54 kW dan putaran 1489 rpm hingga 1550 rpm. Hasil penelitian menunjukkan bahwa efisiensi mekanis mesin relatif stabil pada kisaran 84,9% – 85%, yang menandakan kerugian mekanis tergolong kecil. Sementara itu, efisiensi termal meningkat seiring dengan menurunnya beban, yaitu dari 49,30% pada beban tertinggi hingga 64,27% pada beban terendah. Hal ini membuktikan bahwa pada kondisi beban rendah, pemanfaatan energi bahan bakar lebih optimal. Selain itu, mesin yang telah beroperasi cukup lama cenderung mengalami kenaikan suhu meskipun beban yang diterapkan rendah, akibat akumulasi panas selama proses kerja. Secara keseluruhan, mesin bekerja cukup baik dari sisi efisiensi mekanis dan termal, meskipun pengaturan beban diperlukan untuk mencapai kinerja optimal.
Analisa Beban dan Ketinggian Penumpukan Terhadap Tekanan Hidrolik Reach Stacker Razaq, Abdur; Supriadi; Mulia
JURNAL VOKASI TEKNIK Vol 4 No 1 (2026): JURNAL VOKASI TEKNIK (JUVOTEK)
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

Penelitian ini bertujuan untuk menganalisis kinerja sistem hidrolik pada reach stacker di PT. XYZ melalui perhitungan daya pompa dan tekanan yang dibutuhkan pada aktuator boom spreader. Metode penelitian dilakukan melalui observasi lapangan dan pengambilan data teknis secara langsung. Hasil perhitungan menunjukkan bahwa daya hidrolik yang dihasilkan pompa untuk mengalirkan oli adalah sebesar 1,33811 kW (1,79443 HP). Tekanan hidrolik yang dibutuhkan bervariasi berdasarkan beban dan ketinggian penumpukan, dengan nilai tertinggi sebesar 1,88 Bar (Peti Kemas 20 ft) dan 2,00 Bar (Peti Kemas 40 ft HC) pada penumpukan tingkat pertama. Seiring bertambahnya ketinggian tumpukan hingga tingkat empat, kebutuhan tekanan menurun hingga titik terendah sebesar 0,031 Bar dan 0,044 Bar. Penelitian ini memberikan kontribusi dalam pemetaan kebutuhan energi hidrolik pada operasional alat berat terminal peti kemas.
Menentukan Drop tegangan pada Distribusi daya dari Generator ke motor Induksi tiga Fhasa disebabkan Panjang kabel penghantar unit screw press PTPN II Sawit Hulu Hillam Saputra Tambunan, Bayu; Mulia; Supriadi
JURNAL VOKASI TEKNIK Vol 4 No 1 (2026): JURNAL VOKASI TEKNIK (JUVOTEK)
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

Drop tegangan merupakan besarnya tegangan yang hilang pada suatu penghantar. Jatuh tegangan pada saluran tenaga listrik secara umum berbanding lurus dengan panjang saluran dan beban serta berbanding terbalik dengan luas penampang penghantar. Besarnya jatuh tegangan dinyatakan baik dalam persen atau dalam besaran Volt. Analisa menetukan drop tegangan pada pendirstribusian daya dari generator ke motor induksi tiga phasa di PT. PERKEBUNAN NUSANTARA II Sawit Hulu menggunakan bahan kabel penghantar tembaga sepanjang 30 meter dengan luas penampang 400 mm2. Jenis bahan kawat tembaga dengan nilai mutlak tegangan kirim sebesar 389 volt dan nilai mutlak tegangan terima sebesar 385 volt. Sehingga terjadi drop tegangan berdasarkan panjang kabel penghantar sebesar 4 Volt. Dan jika dipersenkan nilai drop tegangan tersebut sebesar 1,03 %.
Effect of Palm Oil Viscosity on Centrifugal Pump Performance in a Vacuum Dryer System Golfrid Gultom; M Dimas Gunawan
JURNAL VOKASI TEKNIK Vol 1 No 01 (2023): APRIL ISSUE | JUVOTEK JURNAL
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

Centrifugal pumps are critical components in palm oil processing because their hydraulic performance is influenced by the physical properties of the pumped fluid. This study investigates the effect of palm oil viscosity on the performance of a centrifugal pump supplying a vacuum dryer system. A field-based observational and engineering-calculation approach was applied to a centrifugal pump with a nominal capacity of 12 m³/h and a rated head of 25 m. Three operating temperatures were evaluated: 85, 90, and 95 °C, corresponding to kinematic viscosities of 10.43, 9.45, and 8.61 cSt, respectively. Flow rate, pump speed, fluid density, pressure parameters, velocity head, Reynolds number, pipe losses, total pump head, and shaft-power requirement were determined from operational measurements and hydraulic calculations. As temperature increased from 85 to 95 °C, viscosity decreased by 17.45%, while flow rate increased from 11.64 to 11.71 m³/h. Pump speed increased from 2814 to 2823 rpm, total calculated head increased from 23.011 to 23.274 m, and shaft-power requirement decreased from 1.354 to 1.339 kW. The calculated mass flow rates were approximately 10 t/h at all three conditions, confirming the intended process throughput. The results indicate that temperature-induced viscosity reduction can maintain the required palm oil throughput while slightly reducing the shaft-power requirement under the investigated operating conditions. The findings provide practical operating evidence for temperature-viscosity management in centrifugal pumping systems used in palm oil vacuum-dryer applications.
Pengaruh Bahan Isolasi Termal Terhadap Perpindahan Kalor Pada Tangki Penyimpanan Steam Untuk Meminimalisir Heat Loss dan Tekanan Nurlianna Tarigan
JURNAL VOKASI TEKNIK Vol 1 No 01 (2023): APRIL ISSUE | JUVOTEK JURNAL
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

Back Pressure Vessel (BPV) is a tank that serves as a reservoir for steam generated by the turbine output. Pressure vessels are used as reservoirs for fluids, both liquid and gas. BPV not only plays a role in storing and distributing steam, but also works as a controller of incoming and outgoing steam. Pressure at BPV 3.5 bar and temperature 138℃. This pressurized tank is one of the important industrial processing tools, especially for the palm oil processing industry. In the process prior to steam delivery, one of the most important components is the steam storage medium, because its function is to keep the steam obtained from the turbine output from being lost, so that it can be distributed. Therefore, a steam storage tank is needed that can withstand heat loss so that the temperature and pressure do not drop. Therefore, an insulating material (thermal insulation) is used which has poor properties in conducting heat to the tank wall in order to hold the heat out of the tank into the environment quickly.Glass woll thermal insulationn material is better than rock woll thermal insulation material with the same thickness of thermalinsulation material of 50 mm, the heat loss for rock wool is 16.361,3726 kcal/hour and glass wool is 16.244,8158  kcal/hour with a comparison of glass wool that can withstand heat. Better at 116,5568 kcal/hour.
Pemotongan Daun Worm Screw Setengah Lingkaran Untuk Mengurangi Broken Nut  Pada Statiun Press PT X Armanda Purba
JURNAL VOKASI TEKNIK Vol 1 No 01 (2023): APRIL ISSUE | JUVOTEK JURNAL
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

The worm screw press is one of the main components of the Crude Palm Oil extracting machine. The purpose of this research is to find out the amount of pressure that acts on the worm screw press when pressing fiber and nuts. Where in this study there has been a change in the dimensions of the worm screw by cutting the semicircular leaves to get the percentage of broken nuts produced. The research took place from visual inspection and factory testing including tool testing, pressure, and studying the process, the working principle of the screw press machine and recording the specifications of the screw press tool. From the test results, it was found that the worm screw press pressure before cutting was 10676.17 N.m2, while the worm screw press pressure that occurred after cutting the semicircular leaves was 9857.05 N.m2. The greater the worm screw press pressure that works to get maximum oil pressing results but causes broken nuts to be included in the dregs of the press, while the small worm screw press pressure causes oil losses but produces a few broken nuts. The disturbance that occurs in the screw press is a pressure problem.
Perhitungan Kebutuhan Steam Pada Proses Pemisahan Minyak Pada Sludge Separator di Stasiun Klarifikasi Pabrik Kelapa Sawit PT. XYZ Ratna Kristina Tarigan
JURNAL VOKASI TEKNIK Vol 1 No 01 (2023): APRIL ISSUE | JUVOTEK JURNAL
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

Sludge separator is a tool used in the process of separating oil from sludge by adding hot water as a diluent used in the process of separating oil from sludge. Water is supplied to the hot water tank then steam is supplied with a temperature of 100 ⁰C and a pressure of 1.01 Bar to heat the water so that the expected water temperature is 90-95⁰C. In the sludge separator, sludge containing mud, oil, and water is fed from the buffer tank and hot water from the hot water tank which functions as a diluent, where in the sludge separator the oil is separated from the sludge by centrifugal force. After the separation process occurs in the sludge separator, the oil is separated from the sludge and flows into the oil reservoir and the sludge is collected into the waste pond. Based on mass balance calculations, it is obtained that the amount of water used in the process of separating oil in sludge in the sludge separator is 2,502.2501 Kg/hour. From the calculation of steam requirements, it is obtained that the amount of steam required in the process of separating oil in sludge in the sludge separator is 286.4361283 Kg/hour
Perhitungan Neraca Massa Pada Unit Screw Press di PT. XYZ Novia Nelza
JURNAL VOKASI TEKNIK Vol 1 No 01 (2023): APRIL ISSUE | JUVOTEK JURNAL
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

Function of screw press is for extraction or separate crude oil from mesocarp based on mechanical. In extraction process based on mechanical all the mass out from digester will be extraction on unit is named screw press with capacity 12 ton/hour. In extraction process is added dillution water 9% from capacity process. This study aims to calculate mass in and out from screw press. The method is used calculating of mass balance. The mass balance is a calculation of all the materials that enter, accumulate and leave a system within a certain time. For the result of mass balance flow mass enter on screw press such as mass out from digester is 8,0604 ton/hour dan dilution water is 1,08 ton/hour. While flow mass out of screw press dregs of press is 2,352 ton/hour dan crude palm oil is 6,7884 ton/hour.

Page 11 of 18 | Total Record : 175

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