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Herry Irawansyah
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Program Studi Teknik Mesin, Fakultas Teknik, Universitas Lambung Mangkurat Jalan Jenderal Achmad Yani KM 35,5 Banjarbaru, Kalimantan Selatan - 70714
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JTAM ROTARY
Published by Universitas Lambung Mangkurat
ISSN : 27216225     EISSN : 27456331     DOI : https://doi.org/10.20527/jtam_rotary.v2i2
Core Subject : Science, Engineering,
Control & Systems Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
JTAM Rotary diterbitkan oleh Program Studi Teknik Mesin Fakultas Teknik Universitas Lambung Mangkurat. JTAM Rotary merupakan jurnal terbuka yang dapat diakses siapapun, baik itu peneliti, akademisi, dan praktisi di bidang teknik mesin. JTAM Rotary terbit dua kali dalam setahun, yaitu pada bulan April dan bulan September. JTAM Rotary berfokus pada jurnal-jurnal mahasiswa teknik mesin di bidang keahlian Konversi Energi, Desain dan Konstruksi, Manufaktur, dan Rekayasa Material.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 121 Documents
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PENGARUH JARAK ANTAR ELEKTRODA PLAT STAINLESS STEEL TERHADAP PRODUKTIFITAS DAN EFISIENSI GENERATOR HHO MENGGUNAKAN METODE ELEKTROLISIS AIR SUMUR DENGAN KATALIS NaHCO3 Khairul Sahwan; Mastiadi Tamjidillah
JTAM ROTARY Vol 2, No 2 (2020): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v2i2.2415

Abstract

Gas HHO merupakan energi alternatif yang dapat menggantikan sumber energi fosil. Gas HHO dapat diproduksi dengan beberapa cara termasuk elektrolisis air. Dalam penelitian ini peneliti menggunakan metode elektrolisis air sumur menggunakan katalis NaHCO3 dalam penelitian ini. Peneliti menggunakan variasi jarak antar roda yaitu 2mm, 4mm, dan 6mm. Dari hasil penelitian disimpulkan bahwa waktu yang dibutuhkan untuk memproduksi gas HHO pada 50 pertama adalah yang tercepat pada jarak 2 mm yaitu 95 detik. Sedangkan paling lambat di jarak 6 mm, 123 detik. Laju aliran gas HHO pada jarak 2 mm lebih besar dari pada laju alir pada jarak 4 mm dan jarak 6 mm. Semakin kecil jarak antar pelat maka semakin cepat pula gas HHO yang dihasilkan. Pada saat proses elektrolisis, didapatkan tegangan yang lebih rendah dengan jarak 6 mm yaitu 3,4 volt sedangkan arus terendah diperoleh pada jarak 2 mm yaitu 4,25 ampere. Energi listrik terendah diperoleh pada jarak 2 mm yaitu 50 ml start menggunakan energi 1266,35 joule. Dari beberapa faktor yang mempengaruhi efisiensi generator HHO didapatkan efisiensi tertinggi pada jarak 2 mm yaitu rata-rata 37,90% dan efisiensi terendah pada jarak 6 mm yaitu 20,58%, sehingga diperoleh efisiensi pelat 2 mm. HHO gas is an alternative energy that can replace fossil energy sources. HHO gas can be produced in several ways including water electrolysis. In this study the researchers used the electrolysis method of well water using NaHCO3 catalyst in this study. The researchers used variations in the distance between the wheels, namely 2mm, 4mm, and 6mm. From the research, it was concluded that the time needed to produce HHO gas in the first 50 was the fastest at a distance of 2 mm, which is 95 seconds. While at the latest at a distance of 6 mm, 123 seconds. HHO gas flow rate at a distance of 2 mm is greater than the flow rate at a distance of 4 mm and a distance of 6 mm. The smaller the distance between plates, the faster the HHO gas will be generated. Which is used during the electrolysis process, where the lower voltage is obtained with a distance of 6 mm which is 3.4 volts while the lowest current is obtained at a distance of 2 mm which is 4.25 amperes. The lowest electrical energy is obtained at a distance of 2 mm ie 50 ml starting using energy of 1266.35 joules From several factors that affect the efficiency of the HHO generator, the highest efficiency is found at a distance of 2 mm, which is an average of 37.90% and the lowest efficiency at a distance of 6 mm, which is 20.58%, so that the efficiency is obtained plate 2 mm.
ANALISIS HASIL FERMENTASI PEMBUATAN BIOETANOL DENGAN VARIASI MASSA RAGI MENGGUNAKAN BAHAN (BERAS KETAN HITAM, BERAS KETAN PUTIH DAN SINGKONG) Arry Eko Pristiwanto; Rachmat Subagyo
JTAM ROTARY Vol 1, No 2 (2019): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v1i2.1746

Abstract

This study aims to determine the levels of bioethanol from (black sticky rice, white sticky rice and cassava rice) with variations in yeast mass as much as 5 grams, 10 grams and 15 grams knowing the optimum time variation and knowing ethanol levels according to SNI. This research was carried out by hydrolysis or boiling of ingredients (black sticky rice, white sticky rice and cassava rice) using distilled water for 30 minutes, then fermentation using yeast saccharomyces cereviseae and distillation process using a complete destilator to obtain ethanol from fermented then tested with a pen refractometer to determine whether or not ethanol is formed from the distillation process. The selected sample was then tested for ethanol content using a gas chromatography tool. The results of this study are known by testing gas chromatography to find out the ethanol content contained in the distilled sample, the results of ethanol, black glutinous rice with 96 hours fermentation time 92.29% ethanol, and white glutinous rice with fermentation time 96 hours of 100% ethanol and cassava with 96 hours of fermentation time of ethanol content of 98.10%. Keywords: Black Sticky Rice, White Sticky Rice, Cassava, Fermentation, Ethanol
ANALISIS PERPINDAHAN PANAS PADA EKONOMISER DI PLTU PULANG PISAU Syahrul Fajar Setiawan; Aqli Mursadin
JTAM ROTARY Vol 2, No 1 (2020): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v2i1.2000

Abstract

Ekonomiser adalah alat yang digunakan untuk memanaskan air umpan sebelum memasuki boiler dengan memanfaatkan panas dari gas pembakaran di boiler. Dengan meningkatnya suhu air pengisi boiler, juga diharapkan meningkatkan efisiensi boiler. Dalam penelitian ini, pengumpulan data dilakukan di ruang kontrol dan data yang diambil, yaitu Tc.i (suhu economizer air yang masuk), Tc.o (suhu air keluar dari economizer), Th.i (suhu gas buang sebelum memasuki economizer) dan Th.o (suhu gas asap keluar dari economizer). Koefisien perpindahan panas tertinggi 4260.492 Btu / h.ft2. ° F dan koefisien perpindahan panas terendah 4251.243 Btu / h.ft2. ° F. Efisiensi tertinggi 87,43% dan terendah 80,76%. Economizer is a tool used to heat feed water before entering boiler by utilizing heat from the combustion gas in the boiler. With the increasing temperature of boiler filler water, it is also expected to increase boiler efficiency. In this study, data collection was carried out in the control room and the data that was taken, Tc.i (the temperature of the incoming water economizer), Tc.o (the exit water temperature of the economizer), Th.i (flue gas temperature before entering economizer) and Th.o (flue gas temperature exit the economizer). High heat transfer coefficient 4260,492 Btu/h.ft2.°F and low heat transfer coefficient 4251,243 Btu/h.ft2.°F. Highest the efficiency 87,43 % and the lowest 80,76 %.
ANALISA PATAHAN PLANETARY PINION GEAR TRANSMISI DI UNIT EXCAVATOR PC 300 LC-7 KOMATSU Saharil Saharil; Achmad Kusairi Samlawi
JTAM ROTARY Vol 1, No 1 (2019): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v1i1.1405

Abstract

Gears are one of the engine components in the transmission system which functions to forward power from the drive shaft to the shaft to be moved. The speed ratio of the driving gear with the gear that is driven depends on the number of gears of each gear. Fault (Fracture) is the separation of a component or material into two or more parts, Ductile and brittle are the relative terms of certain faults, one type or another depending on the situation, the ductile fracture surface has its own characteristic in the macroscopic. The ductile fracture in the specimen leads to a point. The brittle fracture does not have plastic deformation. Decohesive rupture is a fault that occurs due to environmental reactions Autodesk Inventor is software development from its predecessor software in the CAD field, such as AutoCad and Mechanical Desktop. This software is made with various advantages with its predecessor software. The fracture on the planetary pinion gear Transmission in the pc300lc-7 excavator unit occurs because of the severe load that occurs at the operation, based on von misses analysis can be known (15,57 Mpa), principal stress (9,046 Mpa), and von misses stress with moment twisting (3,088 Mpa) is much smaller than the material elasticity limit of 689 MPa so that there is no stress concentration. The mechanism of failure occurs starting from the shock load in the material without any elastic deformation.
ANALISIS KEGAGALAN OPERASI COOLING TOWER FAN UNIT 2B PLTU ASAM ASAM Andhika Bayu Oktavianto; Mastiadi Tamjidillah
JTAM ROTARY Vol 2, No 1 (2020): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v2i1.2005

Abstract

Salah satu pembangkit listrik di Indonesia adalah pembangkit listrik Asam Asam yang terletak di dekat mulut tambang batubara. Setiap pembangkit listrik membutuhkan sejumlah besar air sebagai fluida kerja atau sebagai air pendingin. Pembangkit Listrik Tenaga Uap Asam Asam Batubara menggunakan air sungai sebagai air pendingin dengan mesin pendingin sebagai mesinnya. Pada bulan September 2017, menara pendingin unit 2B dari PLTU Asam Asam Batubara mengalami kegagalan operasi karena spacer rusak dan membuat PLTU Asam Asam Batubara mengalami penurunan dan kerugian lainnya. Tim teknik mendiagnosis kasus tersebut karena ketidakselarasan. Berdasarkan uraian akar penyebab masalah, ada tiga masalah utama yang mungkin terjadi yaitu: misalignment, unbalance, dan rotasi gearbox berat. Misalignment adalah pemicu utama untuk serangkaian masalah yang menyebabkan kegagalan operasi menara pendingin. Maka perlu mempelajari masalah utama yang menyebabkan kegagalan operasi menara pendingin untuk ditindaklanjuti dengan pemeliharaan preventif sesuai dengan kondisi saat ini untuk mencegah kegagalan yang serupa di unit 2B dan unit serupa lainnya. One of the power plants in Indonesia is the Asam Asam power plant located near the mouth of the coal mine. Each power plant requires large amounts of water as a working fluid or as a cooling water. Asam Asam Coal Fired Steam Power Plant uses river water as a cooling water with the cooling towers as its engine. In September 2017, the cooling tower unit 2B of Asam Asam Coal Fired Steam Power Plant experienced an operation failure because of the spacer was broken and made the Asam Asam Coal Fired Steam Power Plant to experience derating and other losses. The engineering team diagnoses the case due to misalignment. Based on the description of the root causes of the problem, there are three main problems that might occur namely : misalignment, unbalance, and heavy gearbox rotation. Misalignment is the main trigger for a series of problems causing failure of cooling tower operations. Then it is necessary to study the main problems causing the failure of the cooling tower operation to be followed up with preventive maintenance in accordance with the current conditions to prevent similar failures in unit 2B and other similar units.
PENGARUH MEDIA PENDINGIN DAN WAKTU TUNGGU TERHADAP POROSITAS, KEKERASAN DAN STRUKTUR MIKRO MATERIAL AL PADUAN (RONGSOKAN) MENGGUNAKAN METODE PENGECORAN EVAPORATIVE Komang Aria Kresna Kepakisan; Rudi Siswanto
JTAM ROTARY Vol 1, No 1 (2019): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v1i1.1397

Abstract

The purpose of this research is to know the effect of cooling media and holding time to porosity, hardness and micro structure of Al alloy material (scrap) using evaporative casting method. The method used in this research is the experimental method of smelting Al Alloy piston scrap and poured at 700°C in Styrofoam pattern mold with 10 and 15 minutes holding time, then cooled with medium air, brine, and water of PDAM for 30 minutes. The material used is excavator aluminum alloy (scrap) izumi piston with silicon aluminum alloy (Al-12% Si). The highest hardness value obtained from the results of cooling casting with the brine cooling medium for 10 minutes that is equal to 217,996 kg / mm2 average HV. At porosity, the highest value was obtained at holding time of 15 minutes with PDAM water cooling medium 5.088% against raw material. While the result of visual observation with 50x magnification of microstructure of specimen to raw material, Si material in raw material has significant length increase. The conclusion of the research results is that re-casting with variations of cooling medium and waiting time will increase hardness and increase porosity, except on brine cooling medium. Keywords: MTTR, MTTF, RCM (Reliability Centered Maintanance)
PENGARUH TEMPERATUR TUANG DAN JENIS MATERIAL AL RONGSOK (PISTON SEPEDA MOTOR DAN KALENG MINUMAN) TERHADAP POROSITAS, KEKERASAN, DAN STRUKTUR MIKRO HASIL PENGECORAN EVAPORATIVE Muhammad Jurni; Rudi Siswanto
JTAM ROTARY Vol 1, No 2 (2019): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v1i2.1740

Abstract

Aluminum used many generated from household, workshop, office, factory and so on. All this time, the Al scrap is only collected by the owner and sold to the foundry foundry industry. It can be recycled into various products for various alternative products and has the potential to become a source of business. The evaporative casting method is to use Styrofoam as a pattern dumped in the printed sand. This method will produce castings that match the pattern of Styrofoam made. Melting is done by liquefying Al in a crucible furnace and then poured with a variation of casting temperatur of 650°C, 700°C, 750°C, 800°C. The objective of this research is to know the temperatur of pouring temperatur and material type to micro structure, porosity, and hardness of evaporative casting. The smelting furnace uses a crucible furnace with charcoal wood fuel. Materials used for casting Al scrap piston motorcycles and beverage cans. From the observation of the microstructure shows that the higher temperatur of the dendrite chamber size will change from short thin flakes to flakes. The thicker the thicker the lighter the export the higher and the higher the hardness. Keywords: Evaporative Casting, Effect Of Casting Temperatur
PENENTUAN PARAMETER PROSES PEMBUBUTAN TERHADAP KEKASARAN PERMUKAAN MATERIAL ST 42 DENGAN METODE TAGUCHI Ismail Mansyursyah; Mastiadi Tamjidillah
JTAM ROTARY Vol 2, No 2 (2020): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v2i2.2414

Abstract

Penelitian ini bertujuan untuk mengetahui parameter apa saja yang berpengaruh terhadap kekasaran permukaan pada proses permesinan bubut konvensional dengan material ST 42 dan mengetahui parameter apa saja yang menghasilkan kekasaran permukaan yang baik dengan menggunakan metode Taguchi. Berdasarkan dari penelitian yang telah dilakukan maka diketahui tidak ada parameter yang berpengaruh terhadap kekasaran permukaan material baja ST 42. Parameter yang menghasilkan kekasaran permukaan material baja ST 42 yang paling baik adalah jenis mata pahat JCK dengan feeding 0,115 dan kehalusan 3,42 µm. This study aims to determine which parameters affect the surface roughness of the conventional lathe machining process with ST 42 material and to find out which parameters produce good surface roughness using the Taguchi method. Based on the research that has been done, it is known that there are no parameters that affect the surface roughness of the ST 42 steel material. The parameter that produces the best surface roughness of ST 42 steel material is the type of JCK tool blade with a feeding of 0.115 and a smoothness of 3.42 µm.
CATALYTIC CONVERTER BERBAHAN GIPSUM DENGAN CAMPURAN SERBUK TEMBAGA TERHADAP EMISI GAS BUANG Trisna Aditya; Abdul Ghofur
JTAM ROTARY Vol 1, No 2 (2019): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v1i2.1745

Abstract

The purpose of this study is to find out the use of Gypsum-based Catalytic Converter and a mixture of Copper Powder Against Exhaust Gas Emissions and Engine Performance. This study uses an experimental method, the population in this study was Suzuki Satria FU motorcycle in 2009, the data of this study were numbers that showed the exhaust gas content of CO, HC. This research was carried out in the Banjarmasin environment office using a gas analyzer and was also carried out in the Banjarmasin plug and play workshop by using a dynamometer. The technique used in data collection was the variation in rpm and number of compositions. From experiments with three different compositions, the following results were obtained: (1) The results of this study are: the form of Catalytic Converter with composition C, the level of HC emission reduction is maximum of 78,91%, the level of CO emission reduction is 82,96%. The form of Catalytic Converter with plate variation 6 (six), the maximum level of CO2 emission reduction is 29,56%, the level of CO emission reduction is 49,32%, and the level of HC emission reduction is 82,92%. (2) Using a Catalytic Converter produces a power of 10,29 Hp and a Torque of 10,35 Nm. Keywords: Catalytic Converter, Emission, Gypsum, Muffler, Concentration
ANALISIS PENGARUH VIBRASI TERHADAP PERFORMA BOILER FEEDWATER PUMP (BFP) 3B PLTU ASAM ASAM Yanuar Iswahyudi
JTAM ROTARY Vol 2, No 2 (2020): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v2i2.2418

Abstract

Pada Desember 2016 hingga Januari 2017, terjadi penurunan kinerja PLTU Asam Asam Unit 3 yang signifikan dalam penyediaan tenaga listrik. Hal ini dikarenakan adanya permasalahan pada Boiler Feedwater Pump (BFP) 3B. Kemudian masalah harus diselesaikan oleh Turbin dan Kru Pemeliharaan Tambahan dengan beberapa perbaikan. Perbaikan BFP 3B berada pada masalah jarak jalan internal dan masalah poros tekuk. Setelah diperbaiki, data perhitungan menunjukkan bahwa efisiensi total pompa meningkat sebesar 10%, dan zona getaran berpindah dari zona D (berbahaya) ke zona A (aman untuk pengoperasian berkelanjutan). In December 2016 until January 2017, there was a significant decreasing performance of Unit 3 PLTU Asam Asam in supplying electric power. This was because of some problems in Boiler Feedwater Pump (BFP) 3B. Then the problems have to be solved by the Turbine and Auxiliary Maintenance Crew by some repairs. The repair of BFP 3B are in the internal running clearance problem and bending shaft problem. After the repair of them, calculation data show that the pump total efficiency increasing by 10 %, and the vibration zone move from D zone (dangerous) to A zone (safe for continuous operation).

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