Pengembangan Tungku Pembakaran Menggunakan Air Heater dan Tanpa Air Heater untuk Bejana Penguap Pipa Api

Penelitian ini bertujuan untuk mengetahui perbandingan pengaruh kinerja tungku menggunakan Air Heater Dan Tanpa Air Heater meliputi kinerja tungku, kalor hasil pembakaran, kebutuhan Bahan Bakar, dan Efisiensi Thermal dengan menggunakan bahan bakar sekam padi. Metode penelitian yang digunakan berupa pengujian pengaruh temperatur tungku, temperatur gas cerobong, temperatur air, kebutuhan bahan bakar, dan efisiensi thermal tungku menggunakan bahan bakar sekam padi dengan Air Heater Dan Tanpa Air Heater. Hasil penelitian menunjukkan bahwa percobaan Mengunakan Air Heater Dan Tanpa Air Heater mempengaruhi besarnya temperatur pembakaran tungku, waktu pendidihan air, kebutuhan bahan bakar, efisiensi termal tungku. Temperatur tungku tertinggi pada Air Heater 884oC pada menit 120, pendidihan air tercepat diketahui pada Air Heater dengan waktu 60 menit, kebutuhan bahan bakar paling sedikit pada Air Heater 14.75 kg lama waktu 125 menit, efisiansi thermal tungku Air Heater, yaitu 95%

Analisa Beban Maksimum Yang Dapat Diangkat CRAWLER CRANE XCMG QUY55

Crawler crane is one type of crane that can move in a project location using a crawler as wheels for moving. This analysis aims to determine the maximum load that can be lifted Crawler Crane XCMG QUY55 using main boom 52 m with variation working radius crane 34 m and 12 m, and Crawler Crane XCMG QUY55 using main boom 34 m and fixed jib 15,25 m, with variation working radius of cranes 30 m and 18 m. The data used for the calculation analysis is the total weight of counter weight, unit weight of crane, total weight of main boom, total weight of fixed jib, and weight of hook block. The calculation analysis is done by calculating all the moments in the crane, until be find the maximum load can be lifted crane. From the calculation results, find the maximum load that can lift the crane on each variation of analysis that is: P1 = 1.331,986 kg, P2 = 14.973,429 kg, P3 = 5.605,293 kg, P4 = 10126.437 kg

Studi Gasifikasi Berbahan Bakar Briket Batubara Terhadap Temperatur Pembakaran

In the recent years, energy has become a crucial issue in the world. The energy crisis caused by growth of population and depletion of world oil reserves along with the emission issue from the fossil fuels gives pressure to each country to immediately produce and use renewable energy. Coal briquette is a renewable energy which is also very potential in Indonesia. By using gasification technology, coal briquettes are burned with limited oxygen to produce a fuel-burning methane gas. The testing of coal briquette gasification aims to find out the effect of diameter size on combustion temperature, boiling temperature of water, effective flame and thermal efficiency of the furnace. The research began by supplying air from the blower with 6.5 m/s speed. Then, diameter sizes variations on coal briquettes were apllied. The diameter size used were 10 mm, 15 mm, and 30 mm. Afterwards, combustion temperature and boiling temperature of water were measured per one minute. The fidings showed that variations on diameter size were highly significant on the combustion temperature, boiling temperature of water, effective flame and thermal efficiency of the furnace produced. In the diameter size of 10 mm, the highest burning temperature was 588.33 0C, the boiling temperature was for 94 minutes, the flame effective was for 94 minutes, and the thermal efficiency of furnace was by 36.88 %. Next, in the diameter size of 15 mm, the highest burning temperature was 513.33 0C, the boiling temperature was for 78 minutes, the flame effective was for 78 minutes, and the thermal efficiency of furnace was by 39,14 %. Lastly, in the diameter size of 30 mm, the highest burning temperature was 705.66 0C, the boiling temperature was for 55 minutes, the flame effective was for 55 minutes, and the thermal efficiency of furnace was by 40.11 %. Keywords : gasification, coal briquette, diameter siz

Analisa Tegangan Maksimum Wire Rope Dan Hook Pada Overhead Hoisting Crane Kapasitas 7,5 Ton

ABSTRACT Wire rope and Hook are components that function as work equipment on overhead hoisting crane units. This analysis aims to determine the maximum stress that can be resisted by the wire rope and hook on the overhead hoisting crane by calculating the maximum tensile wire rope, hook tensile stress and hook pressure tension. Data collection is done by measuring on the wire rope and hook. Then do the calculation analysis on the wire rope and Hook using equations according to theory. The result of calculation of maximum tensile stress on wire rope type 6x37 = 222 x 1c at 451,55 (kg / mm2) and on wire rope type 6x19 = 114 x1c equal to 519,69 (kg / mm2). Results of calculations on single hook large tensile stresses of 6.14 (kg / mm2), for compressive stresses of 3.59 (kg / mm2) and at double hook large tensile stresses of 6.09 (kg / mm2), for compressive stress of 3.34 (kg / mm2). So the tensile stress and maximum hook pressure does not exceed the maximum allowable voltage of 10 (kg / mm2). Keywords: Crane, wire rope, Hook, Voltage, Security usag

Pengaruh Variasi Kecepatan Udara Terhadap Temperatur Pembakaran Pada Tungku Gasifikasi Sekam Padi

Bahan bakar fosil adalah termasuk bahan bakar yang tidak dapat diperbaharui (non renewable ). Jumlah konsumsi bahan bakar fosil baik minyak bumi, gas alam, ataupun batu bara di Indonesia kian tahun kian meningkat. Biomassa sekam padi merupakan energi yang dapat diperbaharui dan sangat potnsial di Indonesia. Melalui teknologi gasifikasi, sekam padi dibakar dengan oksigen terbatas untuk menghasilkan gas metan yang mempan bakar. Pengujian gasifikasi sekam padi ini bertujuan untuk mengetahui pengaru variasi kecepatan udara terhadap temperatur pembakaran, temperatur pendidian air , nyala efektif dan efisiensi thermal tungku. Penelitian diawali dengan memodifikasi saluran udara blower pada reaktor, kemudian suplai udara dari blower divariasikan kecepatanya. Kecepatan udara yang digunakan adalah 3.5 m/s, 4.0 m/s dan 4.5 m/s, kemudian diukur temperatur pembakaran dan temperatur pendidihan air tiap 3 menit. Hasil penelitian menunjukan variasi kecepatan udara sangat berpengaruh terhadap temperatur pembakaran, temperatur pendidihan air, nyala efektif serta efisiensi thermal tungku yang dihasilkan. Kecepatan udara 3.5 m/s temperatur pembakaran tertinggi sebesar 526.33 0C, temperatur pendidihan air selama 18 menit, nyala efektif selama 33 menit, dan efisiensi thermal tungku sebesar 17.55 %. Kecepatan udara 4.0 m/s temperatur pembakaran tertinggi sebesar 568.78 0C, air mendidih selama 15 menit, nyala efektif selama 30 menit dan efisiensi thermal tungku sebesar 17.33 %. Kecepatan 4.5 m/s temperatur pembakaran tertinggi sebesar 570.22 0C, waktu pendidihan air selama 12 menit, nyala efektif selama 27 menit dan efisiensi thermal sebesar 15.97 %

Analisa Kerusakan Dan Perbaikan Power Train Pada Unit Excavator Kobelco SK200-5

Power train is a drive mechanism that works together to transmit power from the engine to the final drive, how the power train works when the engine rotates drives the main pump to circulate pressurized oil from the tank to the control valve and is passed on to the travel motor to drive the final drive. A visual inspection of the components is carried out to ensure that the power train components are damaged which causes the unit to stutter, along with several visual inspections of the power train components including checking the Control Valve, Idler, and Motor Travel. Based on the results of checking the power train has damage to the worn sprocket teeth. This damage is caused by soil or mud that sticks and hardens resulting in erosion of the components which makes the components wear out, the service life has exceeded the limit. Repairs to this sprocket component require replacing it with a new part because the Kobelco Sk200-5 excavator uses a solid type sprocket

Analisa Kerusakan Main Pump yang Digunakan pada Travel Motor Excavator S500LC-V

Main pump excavator is a main component that functions to change mechanical energy into hydraulic energy and then channeled it into the hydraulic system. This analysis aims to determine the performance test operating speed, analyze the causes of damage, take corrective steps and recommend measures to prevent damage to the main pump. The inspection procedure was carried out by performing a performance test consisting of operating speeds test and pressure test. Then an analysis of the results of the performance test, visual analysis of the damaged inner part of the pump, and analysis of the causes of damage using fishbone diagram. The results of the analysis there is damage to the piston pump caused due to life time. Repair steps must be made to replace the piston pump as a whole (assy). Preventive action is carried out by preventing the occurrence of external leakage or internal leakage, as well as running daily check and preventive maintenance according to procedures

The Effect of Secondary Air Injection (SAI) System on Engine Performance of Yamaha Jupiter Z New 115cc

The purpose of this study was to determine the effect of the addition of the SAI system on the performance of a four-stroke motorbike. This SAI system is the addition of a second air supply directly to the combustion chamber through the hole near the intake valve and also adds the air supply from the air filter. Performance testing of this four-stroke petrol engine using an electric dynamometer (dyno test) at 4500 - 9000 rpm with loading on the Jupiter Z New 115cc motor shaft, then the force will be measured and will be converted into torque and power data that can be seen on the monitor screen. Testing without the SAI system was carried out twice as a comparison and then followed by two tests using the SAI system so that the results were more relevant. The results showed that the maximum engine torque without using the SAI system was 7.6 Nm at 4403 rpm and using the SAI system was 7.7 Nm at 4838 rpm so that it increased 0.1 Nm. Then, the maximum engine power without the SAI system is 7.05 Hp at 7483 rpm and using the SAI system is 7.1 Hp at 7375 rpm so that the engine power increases by 0.05 Hp. From this research, the addition of a second air supply has an effect on the performance of a four-stroke petrol engine

Study Karakteristik Pengabutan Nozzle Engine Shanghai SC11B220G2B1 Dengan Variasi Tekanan

This study aims to determine the length of the fission penetration tip and the friction angle by using variations in pressure of 100 bar, 150 bar, 200 bar, 250 bar and 300 bar. The measurement process is done by first adjusting the pressure of the injector tester nozzle, then pressing the nozzle injector tester lever. And start recording the measurement process using a high divination camera. After obtaining the recording characteristics of the fading, then process it into the Image J software to get more accurate data. The measurement results of the fission penetration tip length in each pressure variation have the same result which is 20 cm. The measurement results of the fog angle at a pressure of 100 bar = 15 °, 150 bar = 17 °, 200 bar = 17 °, 250 bar = 19 °, and 300 bar = 21 °

Rancang Bangun Dan Pengujian Tungku Gasifikasi 4Kg Bahan Bakar Sekam Padi

Sekam Padi dapat diubah menjadi gas metana dengan metode gasifikasi. Penelitian ini bertujuan untuk mendapatkan desain dan konstruksi tungku gasifikasi kapasitas 4 kg bahan bakar sekam padi, mengetahui pengaruh kecepatan udara terhadap temperatur pembakaran, mengetahui waktu lama nyala efektif dan mengetahui lama pendidihan air. Penelitian diawali dengan pembuatan tungku gasifikasi sekam padi didapatkan hasil rancangan tungku gasifikasi yang terdiri reactor pembakaran dengan spesifikasi: tinggi reacktor 900 mm, diameter luar reactor 290 mm, dan diameter dalam reacktor 240 mm. Kemudian menganalisis hasil pembakaran tungku gasifikasi dengan kecepatan udara di variasi V=4.3 m/s, V=4.5 m/s, V=4.8 m/s. Dalam penelitian tersebut mengukur temperatur pembakaran serta mencatat perubahan temperatur air sebanyak 5 liter setiap 3 menit. Hasil menunjukkan semakin besar kecepatan udara yang dihasilkan maka semakin tinggi pula temperatur pembakaran pada tungku gasifikasi sekam padi. Pada V=4.3 m/s didapatkan temperatur pembakaran rata-rata 425.73oC, V=4.5 m/s didapatkan temperatur pembakaran rata-rata 462.52 oC, dan V=4.8 m/s didapatkan temperatur pembakaran rata-rata 491.81 oC. Sedangkan nyala efektif dan pendidihan air untuk V=4.3 m/s didapatkan nyala efektif 57 menit lama pendidihan air 8 menit 10 detik, untuk V=4.5 m/s didapatkan nyala efektif 51 menit lama pendidihan air 7 menit 11 detik, untuk V=4.8 m/s didapatkan nyala efektif 48 menit lama pendidihan air 6 menit 14 detik