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All Journal Turbo : Jurnal Program Studi Teknik Mesin Jurnal Teknik Mesin Dharma Raflesia : Jurnal Ilmiah Pengembangan dan Penerapan IPTEKS Jurnal Riset Teknologi Pencegahan Pencemaran Industri TEKNOSIA Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin
Angky Puspawan
Program Studi Teknik Mesin, Fakultas Teknik Universitas Bengkulu
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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Journal : Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin

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INHAUST AND EXHAUST VALVES GAP EFFECTS ON AN ENGINE PERFORMANCES Puspawan, Angky
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 2 (2019): Oktober 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i2.9855

Abstract

Valves is the part in an engine determining engine performance. The setting of the valves is to determine the composition of air and fuel in their combustion room. The mixing of the air and the fuel is the key of the engine performance. Dinamometer test was being conducted for the gap variation of the valves of 0.03 mm, 0.05 mm, and 0.07 mm each either for inhaust valve and exhaust one. The optimum of the engine performance of gasoline fuel as measured from the torque, the power, and the specific fuel consumption was at 0.05 mm of both.
STEAM TURBINE ISENTROPIC EFFICIENCY OF TC 663 MY 140 TYPE-UNIT 4 STEAM POWER PLANT CASE STUDY IN PT. PLN (PERSERO), BUKIT ASAM SECTOR, TANJUNG ENIM REGENCY, SOUTH SUMATERA PROVINCE Puspawan, Angky
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 3 No. 1 (2019): April 2019
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v3i1.9930

Abstract

Coal is one of the important natural resources that can produce energy for electricity generation. Bukit Asam Steam Power Plant (PLTU) PT. PLN (Persero) is a state-owned company that is in charge of managing coal into fuel to produce electricity through the Rankine cycle with one of its main tools being a steam turbine. Steam turbines function to convert heat energy from the boiler to mechanical energy to rotate the turbine. Because the heat energy has enough pressure, temperature, and flow of steam to rotate the turbine rotor. If a steam turbine is used continuously to reduce the quality and isentropic efficiency of the turbine. Therefore, it is necessary to do some work analysis on turbines type TC663 MY 140 Unit 4, Bukit Asam Sector PLTU. From observing and retrieving data and the results of calculating steam turbines during a two-day operation, the average value of isentropic efficiency on the first day was 57.86% with a range of 56.19% -59.92% and 54.51% on the second day 44.29% 59.58%.So,the pressure and temperature of the steam turbine greatly affect the performance of the steam turbine where if the pressure and the inlet temperature of the steam turbine are large then the work of the steam turbine increases and vice versa. From the results of calculations and discussion it can be concluded that the steam turbine used in PT. PLN (Persero) is still working well.
THE HEAT TRANSFER FLOW ANALYSIS OF STANDARD PLATE STELL OF JIS G3106 GRADE SM20B ON PRE-HEATING JOINT WEB PLATE I-GIRDER PROCESS CASE STUDY IN PT. BUKAKA TEKNIK UTAMA, BOGOR REGENCY, WEST JAVA PROVINCE Puspawan, Angky; Pangestu, Mirza Aditya; Suandi, Agus; Alqaf, A. Sofwan Furqon
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 4 No. 1 (2020): April 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v4i1.13270

Abstract

PT. Bukaka Teknik Utama in working on government projects, namely the construction of the Jakarta-Cikampek elevated toll road, the focus of fabrication of steel plates. The steel plate fabrication process, there is a pre-heating process for two steel plates connected by SAW welding with the Joint Web Plate process. During the pre-heating process, conduction heat transfer takes place from the PWHT ceramic to the steel plate. To complete the calculation of the unstable conduction heat transfer two equations are used, namely the equation q transient conduction and q the capacity of the object. Both equations are substituted to get the value of time needed to heat a steel plate from 40oC to 99oC. After calculation and analysis, it can be concluded that the heating time of JIS G3106 Grade SM520B steel plate is directly proportional to the desired temperature. Where the higher the heating temperature is desired, the longer the heating time required to reach the heating temperature. The calculation results obtained the smallest heating time value is 28.695193 seconds at a temperature of 40oC and the largest heating time value is 790.858579 seconds at a temperature of 99oC.
Analisa Pengaruh Variasi Diameter Tabung dan Jarak Katup Buang Limbah terhadap Unjuk Kerja Sistem Pompa Hidrolik Ram [Pompa Hidram] Puspawan, Angky; Suandi, Agus; Witanto, Yovan; Putra, Shandy Tri
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 4 No. 2 (2020): Oktober 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v4i2.18395

Abstract

Pompa hidram adalah salah satu jenis pompa yang energi atau tenaga penggeraknya berasal dari tekanan atau hantaman air yang masuk ke dalam pompa melalui pipa. Masuknya air yang berasal dari berbagai sumber air ke dalam pompa harus berjalan secara kontinyu. Pompa hidram memiliki banyak keuntungan dibandingkanpenggunaan jenis pompa air lainnya, diantaranya tidak membutuhkan pelumasan, bentuknya sangat sederhana, pembuatan dan pemeliharaanya lebih murah. Selain itu pompa ini mampu bekerja 24 jam per hari. Beberapa hal yang dapat mempengaruhi efisiensi pompa hidram ini, seperti tinggi masukan air, jarak katup buang limbah, dandiamater volume tabung. Pada penelitian ini diameter pipa yang digunakan adalah pipa diameter 2,5 inch, 3 inch, dan 4 inch dengan variasi volume tabung 0,0006 m3, 0,0013 m3, 0,0027 m3, dan 0,0040 m, pada jarak katup buang limbah divariasikan 50 mm, 75 mm, dan 100 mm, sedangkan tinggi masukan 1 meter. Dari hasilpengujian dan data hasil perhitungan didapat efisiensi maksimum 82,50% pada volume tabung 0,0027 m diameter pipa 4 inch, tinggi masukan air 1 meter, dan jarak katup buang 75 mm, sedangkan efisiensi terendah didapat pada volume tabung 0,0040 m3 diamater pipa 4 inch, pada jarak katup buang limbah 50 mm, dan tinggimasukan air 1 meter dengan nilai efisiensi 60,00%.
PERPINDAHAN PANAS PADA PIPA HEAT EXCHANGER DENGAN PIPA BERBAHAN KACA, TEMBAGA, DAN TEMBAGA YANG DILAPIS RESIN Nuramal, Agus; Puspawan, Angky; Pratama, Gilang Giyas
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 4 No. 2 (2020): Oktober 2020
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v4i2.18396

Abstract

In this study, a heat exchanger will be designed with the principle of tube-pond, normal water flowing tubes and hot water-filled ponds. This study aims to determine the heat transfer characteristics of glass pipe, copper, and resin coated copper.The materials used in the tube were glass, copper, and resin coated copper, polyester resin of yukalac BTQN 157 and a catalyst of methyl ethyl ketone peroxide. In the test, the water temperature variation in ponds was 70?C, 80?C, and 90?C. At each temperature, the test was carried out by flowing normal water into the tube by varying the discharge by 1lpm, 0.8lpm, 0.6lpm, 0.4lpm, and 0.2lpm. The values for the temperature in and out of the water in the tube are obtained. So that the overall heat transfer coefficient value and its effectiveness can be calculated.The results showed that the higher the discharge, the overall heat transfer coefficient on the tube increased. where the highest value is in the copper tube meterial at 1 lpm discharge, which is at 80?C pond temperature of 1544.163 W / m2?C. While the smallest value of the overall heat transfer coefficient is the glassmaterial at the time of discharge 0.2 lpm, which is at a temperature of 90?C of 199.5889 W / m2?C
THE HEAT TRANSFER FLOW ANALYSIS OF THE JIS G 3106 SM520B STEEL PLATE CUTTING PROCESS USING CNC FLAME CUTTING MACHINE IN THE MANUFACTURE OF THE BOTTOM PLATE BOX GIRDER Puspawan, Angky; Febriansyah, Febriansyah; Suandi, Agus; Supardi, Nuruliman
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 5 No. 1 (2021): April 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v5i1.20148

Abstract

PT. XYZ uses CNC flame cutting technology to produce steel bridge material with the principle of thermal cutting which will cause the phenomenon of heat transfer and heat affected areas. By using the inverse method to determine the application of heat on the SM520B steel plate. The JIS G3106 SM520B steel plate is formed from a Heat Affected Area (HAZ). This happens because of differences in cutting temperature and the temperature of the Steel Plate. The analysis results obtained from conformity with the Box Girder design. In the Box Girder design, the active load is given a distance of 60 mm from the heat- area affected so as not to fatigue.
Lube Oil Cooler Performance Analysis Before and After Maintenance Outage at PLTGU Saputra, Andrian Nurul; Puspawan, Angky; Supardi, Nurul Iman
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 5 No. 2 (2021): Oktober 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v5i2.20170

Abstract

This work has been done in one of the gas and steam power generating units in the Southern Sumatra. Lube oil cooler is a cross flow compact heat exchanger that functions to release the heat carried by lubricating oil flowing through the shell side to the tube side with water cooling fluid where each liquid is separated in the lube oil cooler the ratio of the heat transfer coefficient on the shell and pipe sides tube and the effectiveness of heat transfer that occurs. It can be concluded that before maintenance outage the logmean temperature difference value (LMTD) was 15.48 oC while after maintenance outage the LMTD value decreased to 10.52 oC. The effectiveness value before maintenance outage was 50.62%, whereas after maintenance outage was carried out the average value increased by 59.61%. So that a good performance is in the condition after the maintenance outage.
PERAWATAN MESIN CUTTING RETURN BENDS Gunawan, Hendi; Puspawan, Angky; Helmizar
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 7 No. 1 (2023): April 2023
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v7i1.30101

Abstract

The cutting return bend machine itself adopts a programmable logic controller for the interface control center between man and machine for its operation. With the characteristics of high-level optimization, speed, comfortable operation, high precision, reliable performance and attractive appearance. For the use of the cutting return bend machine itself, which is used for the production of u-shaped tubes which will later be used for the manufacture of evaporators and condensors. Maintenance also includes all necessary actions to be able to maintain and maintain product quality so that there is no damage or disruption to the machine so that producing products can achieve the targets as desired by the company. From the observations made, it is found that the problems that occur in the cutting return bend machine at PT. Panasonic Manufacturing Indonesia are damage to the mandrell, stripper,and problem with the bending mechanism. The solution of these problems are need to maintenance of the machine, which is corrective maintenance, preventive maintenance, predictive maintenance, and even emergency maintenance.
PENGARUH AIR FUEL RATIO (AFR) TERHADAP EFISIENSI TURBIN GAS Rifki Sulthan; Angky Puspawan; Agus Nuramal
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 7 No. 2 (2023): Oktober 2023
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v7i2.34064

Abstract

Gas turbine efficiency is an indicator to determine the performance of a generator. The greater the efficiency value of the gas turbine in a generator, the better the performance of the generator. One of the things that affect the value of the efficiency of a gas turbine is the air fuel ratio. Air Fuel Ratio (AFR) is the ratio of the amount of air and fuel in the combustion process in units of mass or volume. Air fuel ratio is a factor that affects the perfection of the combustion process in the combustion chamber. In the graphic image it can be seen that the lowest AFR values are on July 3 and 4 2022, when the gas turbine produces a loading of 20900 kW and 20100 kW with an AFR value of 39.76 unitless each. Whereas the highest AFR value is on June 28 2022 when the gas turbine produces a loading of 20780 kW with an AFR value of 40.68 unitless. The highest gas turbine efficiency value is on June 30, 2022, at a loading of 20,650 kW with a gas turbine efficiency of 83.3%. The lowest efficiency value is on July 2, 2022, at a load of 20,800 kW with a gas turbine efficiency of 81.05%. From the results of existing data processing and graphs, it can be seen that the value of the air fuel ratio and the efficiency of the gas turbine are inversely proportional, which means that when the value of the air fuel ratio decreases, the value of the efficiency of the gas turbine tends to increase. However, there are some deviations when the value of the air fuel ratio decreases, the efficiency of the gas turbine also decreases. Therefore it can be concluded that the value of the air fuel ratio affects the value of the efficiency of the gas turbine, however, the value of the air fuel ratio is not the only factor that affects the value of the efficiency of the gas turbine.
MAINTENANCE PADA POMPA SENTRIFUGAL KEWPUMP Ginting, Zefanya Karsten; Helmizar; Puspawan, Angky
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 8 No. 1 (2024): April 2024
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v8i1.36550

Abstract

Kewpump centrifugal pump is a very important pump in PT. Incasi Raya Edible Oil, West Sumatra Province. Where the efficiency of this pomp greatly affects the performance of PT. Incasi Raya. The use of this centrifuga pump is to move CPO (Crude Palm Oil). This practical work report conveys information on kewpump centrifugal pump maintenance management. This pump works for 24 hours without stopping. Things that need to be done before maintenance are checking into the field, looking for the source of damage, recording the recurrence of the damage, taking data, asking for maintenance schedules. Usually damage to the pump in PT. Incasi Raya occurs due to mechanical seals, damaged bearings, impeller jams that will affect pump performance, so maintenance is carried out using the corrective maintenance method. Based on the maintenance activities carried out, the results were obtained that damage to the pump occurred in the mechanical seal, with moderate damage that was inspected periodically. Then it is necessary to carry out maintenance in accordance with the procedures that have been made.
Co-Authors Agus Nuramal Agus Nuramal Agus Suandi Agus Suandi Agus Suandi, Agus Alqaf, A. Sofwan Furqon AM Saifutaqi Fatwa Mayfi Anugrah, Dwi Permana Aziz Masyhuri Budiman, Arif Adtyas Falah, Sabilul Febriansyah Febriansyah Fitrilina Ginting, Zefanya Karsten Gunawan, Agustin Hadi Susanto, Tri Nugroho Helmizar Hendi Gunawan Hendra Hendra Hendri Hestiawan Mubarok, Abdul Latif Nopriani, Meti Eliza Nurul Iman Supardi Ompusunggu, Ferdinand Lincoln Pangestu, Mirza Aditya Pratama, Gilang Giyas Putra, Shandy Tri Rifki Sulthan Rifki Sulthan Saputra, Andrian Nurul Sulthan, Rifki SUPARDI, NURULIMAN Surapati, Alex Yanolanda Suzantry Handayani Yovan Witanto Yovan Witanto Yovan Witanto Yueprayuga, Abie