Technical specification of the spinner at the Pilot Plant of FTIP Unpad was needed to be reviewed through technical analysis and performance test. Experimental Design method of the research was carried out by on the spot observations, measurements, and recalculating machine main components. Results obtained from technical analysis showed that the machine required a driven power of 216 W, one single belt, a minimum shaft diameter of 16 mm, as well as a pin diameter at the main roller and at the pulley of 5,46 mm and 6 mm, respectively. It had a deflection torsion of 0,0460 a critical shaft speed of 1338 RPM, a bearing life of 3.227.817,96 hours, a frame deflection of 0,24 mm, and a frame welding load of 503,74 N. Sofar, the machine has fulfilled its technical feasibility. While the results of performance tests showed that the best taste sensation of the crackers was termed at an engine speed of 650 rpm at an actual capacity of 3.6 kg/h and at a power of 120 W, a specific spin energy of 120 kJ/kg, a spin yield of 97.38 %, an engine efficiency of 65.60 %, an engine performance index of 0.95 at a level of noissiness of 86.86 dBA. The data has fulfilled the performance requirement, but due to its vibration frequency of 21.44 mm/s – which was dangerous, improvements related to it had to be done. Keywords: technical analysis, oil spinner, performance test ABSTRAK Spesifikasi teknis mesin peniris minyak (spinner) di laboratorium Pilot Plant FTIP UNPAD perlu dikaji-ulang melalui analisis teknik dan uji kinerja. Metode analisis deskriptif dalam penelitian ini dilakukan melalui pengukuran, pengamatan dan  perhitungan terhadap komponen-komponen utama mesin. Hasil analisis teknik menunjukkan bahwa untuk mengoperasikan mesin ini dibutuhkan daya penggerak 216 Watt, satu sabuk, diameter poros minimum 16 mm, defleksi puntiran 0,0460, putaran kritis poros 1338 RPM, diameter pin pada motor penggerak 5,46 mm, diameter pin pada roll utama dan diameter puli 6 mm. Sementara umur bantalan 3.227 jam, lendutan rangka 0,24 mm, dan beban las rangka 503,74 N. Secara teknis mesin ini telah memenuhi kelayakan teknis. Hasil uji kinerja mesin menunjukkan bahwa sensasi rasa kerupuk terbaik diperoleh pada kecepatan putaran motor 650 RPM dengan kapasitas aktual 3,6 kg/jam pada daya 120 Watt, energi spesifik penirisan 120 kJ/kg, rendemen penirisan 97,376 %, efisiensi mesin 65,60 %, indeks performansi mesin 0,95, dan tingkat kebisingan 86,86 dBA. Data ini telah memenuhi spesifikasi kinerjanya. Namun dengan frekuensi getaran 21,44 mm/s (berbahaya). Perbaikan teknis terkait masalah ini masih perlu dilakukan. Kata kunci: analisis teknik, mesin peniris minyak, uji kinerja

Amount of straw wastes in Ciparay, Bandung, West Java Indonesia reaches 10-12 tons.ha -1 but its has not been well managed, after harvested, the remaining unused straw is abandoned on the ground and is eventually burned. In the long run, this straw burning will be very disadvantageous to farmers, especially in terms of the environmental impacts on rice paddy including decreasing soil fertility, killing soil biota, damaging soil physical properties and wasting energy. One of alternatives to utilize rice straw able to provide added value is utilizing its waste as a material to make compost on the condition that the straw is already chopped into a size of 5-10 cm according to SNI standards. Therefore, a study on rice straw chopping technology based on the composting requirements is required. The aim of this study is to design a prototype of rice straw chopper with capacity 100 kg.hr -1 . The method used in this research is engineering design with observation of the reasearch, design criteria, functional and structural design, figure design, technical analysis, prototyping of rice straw chopper, machine functional and performance test. The measurement results of rice straw characteristics show that the average length, diameter, bulk density and moisture content of rice straw are 708 mm, 4 mm, 160.6 kg.m -3 and 34.6% wet basis. This straw chopper design were produces a prototype with a dimension of 1040 mm (length) x 1000 mm (height) x 465 mm (width) with a power source generator using 5.5 HP gasoline motor. The result of functional test of the straw chopper shows that the actual capacity of this straw chopper is 100.32 kg.hr -1 .

Arabitol byproduct on the production of biodiesel Reutalis trisperma has calories of 0.2 cals / g equivalent to the level of sweetness of sucrose can be produced by using the yeast of Debaryomyces hansenii. The research was done by experimental method and descriptive analysis with two replications. The variation in this study was the ratio between the concentration of glycerol substrate and the fermentation medium added to 250 m / L of work volume in five treatments, namely: A (1: 16) crude glycerol, B (1: 16) pure glycerol, C (1: 8) crude glycerol, D (1:5) crude glycerol, and E (1:4) crude glycerol. The experimental results that the D. hansenii ITB CC R85 yeast may accumulate the formation of arabitol during the stationary phase at 120 h. The best fermentation condition was obtained at treatment C with a specific growth rate (μ) of 0.0608/h, arabitol concentration of 0.2373 g / L, the yield of arabitol to glycerol (Yp / s) of 0.0041 g / g, the yield of biomass to the substrate (Yx / s) of 0.3214 g / g.

Mesin penepung vertikal (mill dryer vertical) Tipe MDV-10 belum memiliki spesifikasi teknis, karena itu uji kinerja dan analisis energi ini perlu dilakukan, agar mesin siap dipasarkan kepada masyarakat pengguna. Penelitian ini bertujuan untuk memperoleh data uji kinerja mesin mill dryer vertical dan data analisis penggunaan energi yang terjadi selama proses penepungan. Bahan yang digunakan dalam melakukan penelitian ini adalah singkong segar. Metode penelitian yang digunakan dalam penelitian ini adalah metode penelitian deskriptif. Hasil penelitian menunjukkan bahwa mesin mill dryer vertical memiliki nilai kapasitas aktual dan teoritis sebesar 21,15 kg/jam dan 100 kg/jam, efesiensi mesin sebesar 21,155%, persentase tepung tercecer sebesar 0%, persentase susut massa sebesar 78,820%, rendemen sebesar 21,18%, kebutuhan daya sebesar 6,97 kW, konsumsi bahan bakar sebesar 6,42 kg/jam, dan tingkat kebisingan mesin sebesar 96,68 dB. Adapun hasil tepung singkong memiliki nilai kadar air sebesar 9,68%. Nilai indeks keseragaman tepung yang dihasilkan sebesar 1 : 7,71 : 108,46 dengan modulus kehalusan sebesar 0,56 dan diamater tepung sebesar 0,006 inci. Sedangkan hasil analisis energi menunjukkan bahwa penggunaan energi dalam proses penepungan sebesar 83,881 MJ/kg tepung. Penggunaan total energi manusia sebesar 0,171 MJ/kg. Penggunaan total energi langsung sebesar 2,332 MJ/kg. Penggunaan total energi tak langsung sebesar 80,79 MJ/kg.

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