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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 Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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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.
PROSES PERLAKUAN PANAS UNTUK MELURUSKAN MATERIAL H- BEAM DENGAN METODE FIRING Ompusunggu, Ferdinand Lincoln; Puspawan, Angky; Hestiawan, Hendri
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 9 No. 1 (2025): April 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v9i1.39015

Abstract

Welded beam is a profile obtained by welding 3 sheets of plate consisting of 2 flange plates and 1 web plate formed into an I-Beam or H-Beam profile. The welding process is carried out with a special SAW welding machine and continued with a straightening process because the heat from the welding causes the welded beam profile to bend or twist. Due to the heat during welding, there is a minimum welded beam size and the minimum plate thickness cannot be straightened again during the straightening process because the melting point of the material exceeds the limit during the welding process. Firing is the process of burning material at a certain temperature with the intention of improving the dimensions of the material. The purpose of this study is to straighten H-Beam steel. In carrying out the firing process using tools and materials such as the Huawei CG1-30 machine, chalk stamps, square rulers, nitrogen and gas and K3 equipment, in carrying out the firing process, checks are carried out using a square ruler and determining the burning point on the H-Beam steel, chalk stamps are used to measure the temperature in the firing process. The firing process has The conclusion of this study is that the heat treatment process (firing) can straighten H-Beam steel using the Huawei CG1-30 machine which has a speed of 50-750 mm/minute.
PERFORMA POMPA SEKUNDER PADA SISTEM PENDINGIN REAKTOR NUKLIR Anugrah, Dwi Permana; Nuramal, Agus; Puspawan, Angky; Falah, Sabilul
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 8 No. 2 (2024): Oktober 2024
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v8i2.39461

Abstract

Secondary pump in the reactor nuclear works move fluid in the reactor with take hot from system primary coolant and discard it to environment. For support safety reactor nuclear this need done study to performance pumps secondary being one​​ system cooler reactor. Methodology study consists from studies literature, observation field, and data collection. Pump used as pump secondary to the system cooler Reactor nuclear This is centrifugal water pump with rate Genre volumetric 4500 liters/ minute with capacity adjustable water flow with characteristics heat exchanger. From the results calculation of data taken on three different day​show mark increased efficiency due to rising mark WP. This matter proves that mark WP on pump system cooler secondary reactor nuclear influence mark efficiency from pump secondary used.​ For mark efficiency highest there at 11:00 with​mark amounting to 18.288%.
DESAIN DAN PEMBUATAN HAND LOADER OUTPUT DENGAN MENGGUNAKAN SOFTWARE SOLIDWORKS Yueprayuga, Abie; Puspawan, Angky; Nuramal, Agus; Hadi Susanto, Tri Nugroho
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 9 No. 1 (2025): April 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v9i1.39474

Abstract

The design of this output hand loader aims to be a place to receive samples that have passed testing in order to improve ergonomics during the irradiation sampling process by utilizing existing materials (acrylic). The hand loader output testing method is by calculating the travel time for empty capsules and capsules containing five variations of samples when sent from the pneumatic lab to the AAN lab, and followed by testing the functional integrity of the capsules when transferred. The results show that the travel time required for the capsule to reach the hand loader is 2 seconds and the capsule is not damaged, broken or other defects. The conclusions obtained from the design of the output hand loader were the design and use of acrylic material that did not damage the capsules during testing and improved ergonomics during the sampling process compared to the previous sampling site. Apart from that, the problem when making an output hand loader lies in making bolt holes that are not parallel to other parts, which requires making new holes.
Socialization of New and Renewable Energy for Community of Sawah Lebar Baru Sub-District, Ratu Agung District, Bengkulu City: Sosialisasi Sumber Energi Baru dan Terbarukan untuk Masyarakat Kelurahan Sawah Lebar Baru, Kecamatan Ratu Agung, Kota Bengkulu Angky Puspawan; Afdhal Kuniawan Mainil; Helmizar; Fepy Supriani; Hardiansyah; Hendri Hestiawan; Khairul Amri; Makmun Reza Razali; Nurul Iman Supardi
Dharmakayana Vol 2 No 1 (2025): Mei : Dharmakayana: Journal of scientists, engineers, educators and scientific ac
Publisher : Program Studi Teknik Mesin, Fakultas Teknik Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dk.v2i1.41616

Abstract

Pertumbuhan ekonomi dan kemajuan teknologi akan menyebabkan tingginya penggunaan energi. Sebagian besar energi di dunia menggunakan sumber energi berbasis fosil, dimana penggunaannya menghasilkan emisi gas rumah kaca yang berdampak buruk pada lingkungan, seperti pemanasan global dan dampak negatif terhadap kesehatan manusia. Karenanya beberapa negara maju dan berkembang melakukan aksi dalam pembatasan penggunaan energi fosil dan mendorong pemanfaatan energi baru dan terbarukan yang lebih ramah lingkungan dan lebih berkelnajutan (sustainable). Diantara aksi tersebut adalah Paris Agreement pada tahun 2015 yang mendorong setiap negara melakukan kegiatan untuk menurunkan iklim global setidaknya 1,5°C – 2°C. Energi baru dan terbarukan adalah sumber daya energi alami yang dapat digunakan secara bebas, terus diperbaharui, tak terbatas, dan terus berkelanjutan. Hal-hal terpenting adalah terkait jenis, sumber, dan manfaat dari energi baru dan terbarukan. Kebutuhan manusia akan sumber daya energi tidak dapat diabaikan, karena setiap aktivitas memerlukan sumber daya, baik itu terbarukan maupun tidak. Namun, penggunaan sumber daya energi yang tidak dapat diperbaharui berlebihan telah menyebabkan kerusakan lingkungan alam yang serius dan akhirnya menghasilkan polusi yang berbahaya bagi Kesehatan manusia dan lingkungan. Dalam menghadapi keterbatasan sumber daya energi yang tak terbarukan, para ilmuwan dari berbagai negara telah mulai mengembangkan sumber daya energi baru dan terbarukan. Kegiatan pengabdian ini tidak hanya bertujuan untuk memperkenalkan konsep energi baru dan terbarukan, tetapi juga memberikan solusi konkret terhadap masalah sampah yang telah menjadi ancaman serius bagi lingkungan dan kesehatan masyarakat. Masalah sampah, khususnya limbah anorganik, telah menjadi salah satu isu utama yang dihadapi masyarakat modern. Setiap hari, tumpukan sampah kian menggunung, menciptakan dampak negatif yang signifikan, terutama ketika musim hujan tiba. Krisis ini tidak hanya berdampak pada keindahan lingkungan, tetapi juga berpotensi menyebabkan banjir yang melanda daerah pemukiman. Sampah anorganik, seperti plastik, tidak dapat terurai secara alami, sehingga memerlukan intervensi yang inovatif dan berkelanjutan. Sebagai respons terhadap tantangan tersebut, tim pengabdi mengembangkan teknologi mesin pencacah sampah anorganik yang revolusioner. Teknologi ini mampu mengubah limbah plastik menjadi serbuk atau biji plastik, sehingga memfasilitasi proses daur ulang yang lebih efisien. Dengan inovasi ini, kita tidak hanya mengurangi volume sampah, tetapi juga memberikan nilai tambah pada limbah yang selama ini dianggap sebagai masalah. Proses distilasi merupakan salah satu cara atau solusi untuk menghasilkan minyak hasil proses distilasi dengan metode pirolisis untuk bahan bakar cair dan ini menjadi salah satu sumber energi alternatif. Energi alternatif ini diperoleh dari sampah berbagai macam atau tipenya. Karena bahan bakunya berlimpah maka selain menjadi bahan bakar alternatif juga mampu menyelesaikan masalah sampah anorganik yang nyata tidak dapat diperbaharui dan dapat merusak tanah dan lingkungan.
Analisis Distribusi Termal Model Tabung Rheology Test Apparatus Sebagai Media Pengujian Ultrafine Bubbles (UFBs) Nopriani, Meti Eliza; Puspawan, Angky; Witanto, Yovan; Budiman, Arif Adtyas
Jurnal Teknik Mesin Vol 18 No 1 (2025): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.18.1.1759

Abstract

The Fukushima Daiichi nuclear reactor accident has become a major concern in the development of safety design for advanced nuclear reactors. The reactor coolant system is part of the passive safety system, including the containment or reactor building cooling system. This system is designed to prevent damage to the reactor vessel structure and concrete building materials due to excessive heat release into the environment. The coolant flow is designed to move naturally without the help of a pump, utilizing the difference in fluid density as the main driver. The type of coolant plays a major role in generating the flow, especially in terms of its density properties. Fluids with a lower density than water can produce faster flow. One method to reduce the density of water is to insert fine bubbles known as ultrafine bubbles (UFB). To study the thermal characteristics of the fluid when heated, the Rheology Test Apparatus device is used. This study specifically examines the Rheology tube model. Analysis of temperature distribution in the tube is carried out using Computational Fluid Dynamics (CFD) simulations to understand the heat transfer mechanism. The validation process was carried out through experiments at a fluid temperature of 90°C, with a comparison of the temperatures at two points in the height of the tube, namely 0.16m and 0.8m, which are the locations of the heater and show the highest temperature.
ANALISA EFEKTIVITAS HEAT EXCHANGER OIL COOLER SEBELUM DAN SESUDAH MAINTENANCE Aziz Masyhuri; Angky Puspawan; Agus Suandi
Rekayasa Mekanika: Jurnal Ilmiah Teknik Mesin Vol. 6 No. 1 (2022): April 2022
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/rekayasamekanika.v6i1.25453

Abstract

MUSI PLTA is one of the state-owned companies engaged in Hydroelectric Power Generation, MUSI PLTA is one of the largest power plants in Bengkulu Province, which is also a power plant in several provinces on the island of Sumatra. Air power plants consist of many interrelated components which then convert the potential energy of the air into mechanical energy which is then transformed into electrical energy. One of the most important components of this plant is the oil cooler. The oil cooler is a heat exchanger that functions to cool the oil that will be used as a thrust bearing on the generator. This oil cooler has a shell and tube type where two types of fluids flow separately with a two pass heat exchanger type. The effectiveness of the oil cooler unit 1 UL PLTA MUSI on conditions before and before treatment was obtained from the calculation of the effectiveness value. In the pre-maintenance condition, the effectiveness value was 9.947089947 %, while in the pre-maintenance condition the effectiveness value was 13.03 %.
Co-Authors Afdhal Kuniawan Mainil 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 Fepy Supriani Fitrilina Ginting, Zefanya Karsten Gunawan, Agustin Hadi Susanto, Tri Nugroho Hardiansyah Helmizar Helmizar - Hendi Gunawan Hendra Hendra Hendri Hestiawan Hendri Hestiawan Khairul Amri Makmun Reza Razali Mubarok, Abdul Latif Nopriani, Meti Eliza Nurul Iman Supardi 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