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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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Nilai Tekanan serta Efisiensi Hidrolik Sistem Otomatis pada Proses Pengepresan Brondolan Menjadi Crude Palm Oil Unit Screw Press PT XY Manahan Hutagalung
JURNAL VOKASI TEKNIK Vol 1 No 01 (2023): APRIL ISSUE | JUVOTEK JURNAL
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

Screw press is a tool in the pressing unit at a palm oil mill which functions to extract oil from the fruit flesh by means of pressing, so that it has an important role in the palm oil industry. A screw press can also be interpreted as a tool used to extract oil from crushed fruit using pressure from a hydraulic press. The function of the screw press is to separate the crude oil from the fruit flesh and separate the fruit flesh from the seeds that have not been separated in the digester. Inside the Screw Press there is a worm screw which functions to move and press for palm oil so that the dregs are separated from the liquid, whether it is water or oil. This study aims to determine the amount of screw press pressure that works when pressing fiber and nuts on the screw press unit and determine the amount of hydraulic pressure efficiency for PT. XY. From the results of the study it was concluded that the screw press pressure on the press unit was 46 kg/cm2 and the hydraulic pressure was 55 kg/cm2, the oil extraction results were obtained with an efficiency of 85% hydraulic pressure.
Analisa Laju Perpindahan Kalor Pada Alat Penukar Panas Kondensor Pembangkit Listrik Tenaga Uap (PLTU) di. PT XYZ Yanto; Erwin Pardede
JURNAL VOKASI TEKNIK Vol 1 No 01 (2023): APRIL ISSUE | JUVOTEK JURNAL
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

A heat exchanger is a device used to transfer heat between two or more fluids that have different temperatures, namely a fluid with a high temperature to a fluid with a low temperature. The heat transfer is either directly or indirectly. The components contained in the heat exchanger are shell, tube, buffle. The exchange rate of heat transfer in the heat exchanger is co-current and counter-flow. The effect of the fluid flow rate on the heat transfer rate aims to determine the effect of the fluid flow rate on the heat transfer that will be obtained when the heat exchanger cools. The heat exchanger used is a shell and tube heat exchanger. Based on the results of observations and discussion, it is obtained that the value of the heat transfer rate with a different flow rate will affect the heat transfer rate obtained. from the calculation of the overall heat transfer rate with a cooling fluid flow rate of 587.1501 Kg/s of 9707788.01 Kcal/s, 588.4101 Kg/s of 9791147.36 Kcal/s and a flow rate of 589.6701 Kg/s of 10374809, 06 Kcal/s. From the graph it can be seen that the greater the flow rate of the cooling fluid, the greater the rate of heat transfer that occurs.
Sistem Pemodelan Flow Rate Control Menggunakan Teknologi 4.0 di Laboratorium Instrumentasi PTKI Medan Mansyur Mansyur; Said Hanief; Dian Kurnia; Toba Sastrawan Manik; Yanto Yanto
JURNAL VOKASI TEKNIK Vol 1 No 02 (2023): JURNAL VOKASI TEKNIK (JUVOTEK)
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

Fluid flow rate measurement is a measurement to obtain data for analysis because in principle fluid is pressurized energy which is increasingly being developed by industry. Each method of measuring flow rate will produce a different characteristic value, not all types of flow rate measurement can use the same method, judging from the resulting pressure drop it will influence each method used. In this research, flow rate control and data reconciliation were carried out on pipe merging. When measuring fluids, pipe connections such as elbows with a certain slope are often found. The slope of the elbow, orifice and venturi can affect the pressure difference or pressure drop in the fluid that passes through the elbow. The research also carried out a flow rate control system through the orifice plate and a transmitter as a sensor. Then it will be developed to measure flow rates using sensing elements using a microcontroller and display monitoring using a computer. Reconciliation is carried out with flow rate as a measurement variable to prove that the flow rate is as desired or with the set point. The data will be stored directly on the computer device. The results of the test showed that the highest error value for the flowmeter 4.0 was 1.9 with a set point value of 40%. For the PID value, P is 1.999, while I is 999 and D is 100, which is the most optimal PID value and shows the fastest results.
Besarnya Gaya Radial Yang Terjadi Pada Sepasang Roda Gigi Lurus Akibat Adanya Sudut Tekan Dari Roda Gigi Penggerak Di Alat Double Deck Bunch Crusher Hariski Panggabean; Herry Darmadi
JURNAL VOKASI TEKNIK Vol 1 No 02 (2023): JURNAL VOKASI TEKNIK (JUVOTEK)
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

Gears are machine elements whose function is to transmit power and rotate the shaft so that the machine mechanism system can work with its function. Straight gears are used for parallel or parallel shafts. Straight gears are used to drive the rollers in the Double Deck Bunch Crusher. When two straight gears connected to each other rotate, a force arises from the two contacting gears, the straight gear A (the driving one) will press inwards towards the center point of the straight gear B (the driven one). The force acting on the straight gear is the Radial Force (Fr). Radial force is a force that acts perpendicular to the shaft axis which causes the two gears to push each other. The aim of this research is to determine the magnitude of the tangential force and radial force on a pair of straight gears when the Double Deck Bunch Crusher is operating. From the test results, it was found that the tangential force in the pair of straight gears at the top was 263747.629 kg and the tangential force in the pair of straight gears at the bottom was 282444.157 kg while the radial force in the pair of straight gears at the top was 95996.286 kg and the radial force in the pair of straight gears at the bottom is 102801.265 kg.
Perbandingan Nilai Efektivitas Kinerja Mesin Expeller Pressing Pada Proses Pergantian Screw Press Main Shaft Nurlianna Tarigan
JURNAL VOKASI TEKNIK Vol 1 No 02 (2023): JURNAL VOKASI TEKNIK (JUVOTEK)
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

This research aims to compare the effectiveness of the Expeller Pressing machine performance before and after replacing the Screw Press Main Shaft and determine the magnitude of the increase in the percentage (%) of Crude Palm Kernel Oil (CPKO) oil after replacing the Screw Press Main Shaft, along with the use and service life of the machine. Expeller Pressing wear and tear and damage to machine components often occur, such as damage to the Screw Press Main Shaft which causes the effectiveness of machine performance to decrease. The decrease in the effectiveness of machine performance can be determined using the Overall Equipment Effectiveness (OEE) method. To increase the effectiveness of machine performance, improvements need to be made in the form of replacing the Screw Press Main Shaft. Based on the results of the discussion, the effectiveness of the Expeller Pressing machine performance before the Screw Press Main Shaft was replaced was 58% and after the replacement the machine performance effectiveness was 76%. Damage to the Screw Press Main Shaft also has an impact on the CPKO oil produced, before the replacement the percentage of oil obtained was 29.33% while after replacing the Screw Press Main Shaft the percentage of oil obtained was 44% so the percentage increase in oil after replacing the Screw Press Main Shaft is 14.67%.
Besarnya Gaya Gerak Listrik (GGL) Induksi Yang Dihasilkan Oleh Generator Sebagai Pembangkit Listrik Untuk Kebutuhan Pabrik Di PT. Z Karti Karti
JURNAL VOKASI TEKNIK Vol 1 No 02 (2023): JURNAL VOKASI TEKNIK (JUVOTEK)
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

A generator is a device capable of producing electric current. one type of generator is an alternating current generator. Alternating current generators function to convert mechanical power into alternating current electric power. This tool is often used in industry to drive several machines that use electric current as a driving source. The method used is the interview and observation method where questions and answers are asked directly with employees or field supervisors about the power generated by the generator used in the factory and direct observation in the field of the object to be studied. Because of the potential difference between points a and b so that electricity from a flows to b so that a physical phenomenon called electromotive force (GGL) induction occurs, where electromotive force is the force acting on electric charges moving in an electric field or magnetic field. This force refers to the force or impetus that affects the movement of electric charges in a particular medium. From the results of the calculation, the results of the induced electromotive force (GGL) generated by the generator are: E = 342,51 V. And for the results of the calculations obtained the results of the Emax electromotive force (GGL) induction generated by the generator, namely: E_max = 638,06 V. There are several factors that affect electromotive force including: The speed of change in the magnetic field, the number of turns, and the strength of the magnet.
Pengaruh Pemakaian Klorin Terhadap Kadar Mangan (Mn) Dan Besi (Fe) Pada Post – Chlorinasi di PT Xyz Rosmiati Rosmiati; Darry Christine Silowaty Purba; Adil Barus; Irwan Rachmiadji
JURNAL VOKASI TEKNIK Vol 1 No 02 (2023): JURNAL VOKASI TEKNIK (JUVOTEK)
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

The water of the Deli river used as raw water for PT. XYZ Deli Tua contains manganese and iron, which levels were quite high and exceeded the quality standard. The purposes of the research are to determine the effectiveness of caporite to reduce levels of manganese and iron to reach levels that meet the standards Minister of Health Regulation Number 492 of 2010. The sample used in this study was the water of the Deli river used as a source of raw water for PT. XYZ Medan water treatment plant (WTP) location in Deli Tua. Raw water was taken using a submersible water pump located at the bottom of the Deli river. The analytical method used as a reference manganese levels was based on 1- (2-Pyridylazo) -2-Naphthol PAN Method 1977, for determining iron levels was based on the FerroZine Rapid Liquid Method 1970, and for both methods using the Spectrophotometric method. The results showed that iron and manganese levels were quite high, exceeding the standards Minister of Health Regulation Number 492 of 2010 with a maximum standard of manganese level is 0.4 mg/L and a maximum standard of iron content is 0.3 mg/L. After adding a certain dose of chlorine to Deli river water in the Deli Tua WTP, it was found that chlorine effectively reduced Mn 66,6% and Fe 43,03% and meet the quality standards.
Perhitungan Efisiensi Perpindahan Panas pada Unit Cooler Di PT. XY Ratna Kristina Tarigan
JURNAL VOKASI TEKNIK Vol 1 No 03 (2023): November Issue 2023 | JUVOTEK JURNAL
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

PT. XY Medan is a company engaged in the production of NPK fertilizer. One of its products is NPK fertilizer with the formulation 12:12:17:2, which contains 12% nitrogen (N) from urea, 12% phosphorus (P2O5), 17% potassium (KCl), and 2% magnesium (MgO). One of the main stages in the production process is cooling, which is carried out using a rotary cooler operating at a rotational speed of 7 rpm and an inclination angle of 2°. The cooling medium is ambient air drawn into the rotary cooler by an exhaust fan. Heat transfer efficiency is an important parameter because insufficient or excessive cooling may affect the quality of the NPK fertilizer. In addition, evaluating heat transfer efficiency is necessary to determine whether the cooling equipment operates efficiently or requires process optimization. The average residence time of the fertilizer in the rotary cooler is 10 minutes. The average inlet temperature of the NPK fertilizer is 66.8 °C with a mass flow rate of 6,000 kg/h, while the average inlet air temperature is 34 °C with an average air flow rate of 12,626.6132 kg/h. The calculation results show that the average heat released by the NPK fertilizer during the cooling process is 28,478.9244 kcal/h, whereas the average heat absorbed by the cooling air is 26,332.98 kcal/h. Consequently, the average heat transfer efficiency of the rotary cooler is 82.09%. The maximum allowable moisture content of NPK fertilizer with the 12:12:17:2 formulation is 2%, while the average final moisture content obtained at the end of the process is 1.444%, indicating that the product meets the required quality standard.
Besarnya Tegangan Longitudinal Dan Tegangan Tangensial Yang Terjadi Pada Dinding Bejana Bertekanan Di Unit BPV (Back Pressure Vessel) Akibat Adanya Tekanan Fluida Dari Dalam Pada PT. XYZ Yanto Yanto; Mhd Anas Hafidz Setiawan
JURNAL VOKASI TEKNIK Vol 1 No 03 (2023): November Issue 2023 | JUVOTEK JURNAL
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

This research was carried out on a BPV (Back Pressure Vessel) unit where there are voltages acting within the pressure vessel which are capable of causing dimensional changes to the pressure vessel due to pressure. Pressure vessels can accommodate a wide range of elements covering several applications such as in the nuclear, oil, chemical industries, and oil and gas. With research methods carried out at the research site or carrying out field research activities. There are two ways of collecting this data, namely the interview method, which is a way of collecting data by holding interviews or direct questions and answers with heads of departments or company employees about BPV (Back Pressure Vessel) units. Observation Method, namely a method of collecting data by means of direct observation in the field of the object to be carried out carefully. The longitudinal stress that occurs is 158.13909 MPa and the tangential stress that occurs is 23.222 MPa for a working pressure of 3.2 Kg/cm2.
Besarnya Head Losses Pada Aliran Perpipaan Dari Boiler Feed Water Pump Menuju Boiler di PT. Z Manahan Hutagalung; Jhon Wira Wahyu Aritonang
JURNAL VOKASI TEKNIK Vol 1 No 03 (2023): November Issue 2023 | JUVOTEK JURNAL
Publisher : CV MEDAN TEKNO SOLUSI

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Abstract

The research object observed is the amount of head loss that occurs in the boiler feed water pump when pumping feed water for the boiler, head loss is a flow loss consisting of friction loss head in the pipes, and head loss in bends, reducers, valves, and so on. Head loss is divided into two, namely major head loss and minor head loss. The flow loss due to friction is also known as the major energy loss. Major head loss occurs due to the viscosity of the liquid and turbulence due to the hardness of the pipe boundary wall which will cause frictional forces which will cause loss of flow along the pipe. Minor losses are pressure loss due to friction that occurs in valves, T junctions, joints and cross sections that are not constant. This study aims to determine the magnitude of the major head loss and minor head loss that occurs in the boiler feed water pump and to determine the capacity of the boiler feed water pump after the head loss occurs. From the results of the study it can be concluded that the major head loss is 1.63 m and the major head loss minor is 0.74 m and the pump capacity after head loss is 53.81 m3/hour.

Page 12 of 18 | Total Record : 175

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