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INDONESIA
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
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Core Subject : Engineering,
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Articles 3,145 Documents
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Desain Dan Penentuan Lokasi Pembebanan Pendulum Alat Uji Impak Untuk Pengujian Produk Hasil Las Gesek Rotary Bar-Plate Panji Adino; Yohanes Yohanes; Muftil Badri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Fracture that occurred in bar-plate friction welding joint on component, be it with a similar or dissimilar materials, can be reviewed by destructive testing. One of the destructive test on weld joint by friction welding is the impact test. Pendulum of standart Charpy and Izod is not match to use for it. Therefore, in this study was made the design and set up pendulum of impact testing for it, using the finite element method software, by considering dynamic factors that may affect fracture such as, loading angle, loading point on the product bar-plate, the dimensions of pendulum, maximum stess thet occurs, and the mass variation of the pendulum. The Obtain summaries are as follows: (1) Results of the Pendulum tests, it was safe to use, it was qualyfied for pendulum impact testing, and plastic deformation was not occurs on entire pendulum. (2) Based on tests result, loading point (x) at 10mm, affected fracture between bar and plate in HAZ section, while loading point at 40 mm until 15 mm affected fracture on plate, not on the section between bar and plate.Keywords: Bar-plate friction welding, Loading point.
Analisis Kerusakan Liner Pada Mud Pump Ideco T-800 Type Triplex Pump Berdasarkan Reliability, Availability, Dan Metode Fault Tree Analysis Di Pt. X Aldi, Jupri; Yohanes, Yohanes; Yuhelson, Yuhelson
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Mud pump is one type of pump is widely used in industry, mud pump included in the positive type pump. Components of these machines often damage by suddenly one of them is theliner. The purpose of this study is to identify the critical component liner, evaluate the damage cause liner by the method of fault tree analysis (FTA), determine the basic design of the treatment and determine the optimum schedule component replacement liner, analyze the value of reliability, availability, mean time between failure (MTBF), mean time to repaire (MTTR). The existence of the effort are intended to increase the reliability and availability that high to maximize the life of the equipment, as well as the maintenance of an effective. Conclusions obtained includes critical component is the liner 1, cause damage to the liner is scratch. The processing data using Minitab software 16 to determine distribution test, thevalue of MTTR, MTBF, reliability and availability. It is obtained the optimal schedule component liner replacements is done every 56 day with some advantages namely the frequency of replacement of the liner component decreased from an average of 11 times/year be 7 times/year and an increase in the value of reliability in the liner 2.Keywords : Mud Pump, Liner, Reliability, Availability, FTA
Analisis Eksergi Pada Ruang Bakar Pada Pltg Teluk Lembu 20 MW Miswandi, Miswandi; martin, Awaludin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Performance evaluation of the power plants is used by applying the first law of thermodynamics, but this method can not determine the source of irreversibilities. Irreversibility is the factor that caused a process to be irreversible. it is necessary to used exergy analysis. Performance of gas Turbine power plant is evaluated with exergy analysis is very useful in terms of design, evaluation, optimization and improvement of power plant. The result showed that the highest exergy destruction occurred in the combustion chamber reached 21,98 MW (85,21%) and while compressor is the lowest 3,81 MW(14,79%)Based on the calculation, analysis of exergy can determine magnitude, location of the exergy destruction. These will make it easier to conduct optimizations toincrease efficiencyKeywords: Gas turbine power plant, combustion chamber, exergy destruction
Estimasi Biaya Pemeliharaan Bangunan Berdasarkan Pedoman Pemeliharaan Dan Perawatan Bangunan Gedung (Permen Nomor: 24/PRT/M/2008) (Studi Kasus Gedung Perpustakaan Wilayah Soeman H,S Pekanbaru) Riandika Nugraha; Rian Trikomara Iriana
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Building maintenance is necessary to keep buildings viable and livable, not least Soeman H.S library of Pekanbaru. This maintenance should be continuos, so it can be reduce the damage to the building. It is necessary for the proper maintenance strategy based on state laws, Permen No:24/PRT/M/2008, to obtain predictions maintenance costs required by the building. In analyzing the cost of repairs used approximate estimate method wich is the highest unit price per m2 rise buildings.Based on the analysis, the repair costs is Rp. 300,484,825.10,-, the percentage of damage is 0.52 %. Soeman H.S library damage is still considered minor damage, wich is below the percentage of damage required, ie 30 %. While the maintenance costs is Rp. 1,881,364,861.11,- and predicted to increase annually.Keywords: approximate estimate, repair costs, maintenance costs, building maintenance
Pengaruh Variasi Bukaan Lubang Dan Model Penampang Lubang Pada Bangunan Pintu Air Kombinasi Ambang Saluran Terbuka Lahan Pasang Surut Rangga Saputra Pratama; Siswanto Siswanto; Rinaldi Rinaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The influence of rising sea water on tidal land has always been a very common problem in the process of tidal land use as farmland. Network system of water began to be developed, namely the open channel system comes with water as formatter building floodgates, but it hasn't been able to made a solution of the problem increases in sea water to agricultural areas. The importance of knowing the description of the behavior of the flow on the draft water building make this research needs to be done. The use of open channels that come with building a sluice water regulator combined with water weirs are expected to hamper the rising tide if applied on tidal land use as farmland. The purpose of this research is to know the influence of variations of the opening hole sluice and sluice hole cross-section shape of the flow behavior change through the door water combined with weirs in open channel water in the form of discharge coefficient value (Cd). This research was conducted at the Laboraturium University of Hidroteknik Riau using a flume which features open channel water balance door and threshold. The results of this research show that building floodgates open channel on the threshold and are able to withstand the tide of different variations of the opening hole. The value of the coefficient of discharge (Cd) 10 mm hole openings variations between 0.60-0.70, 20 mm hole openings variations i.e. 0.30-0.45 and a 30 mm hole openings variations i.e. 0.25-0.40, These results are obtained from multiple upstream water faces tall test channel.Keywords : open flow, the floodgates, the coefficient of discharge.
Analisis Exergoeconomic Pada Ruang Bakar Pembangkit Listrik Tenaga Gas Uap (PLTGU) Teluk Lembu 30 MW Putri Wahyuni; Awaludin Martin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

One of the causes of the energy crisis in Indonesia is, because it is not efficient in energy use. Many alternatives have been done to make efficient use of energy. One way is to perform the analysis. Analysis meant here is the exergy analysis and analysis exergoeconomic. The concept of this analysis, not only of the quantity of energy but also the quality of energy (the second law of thermodynamics). Exergoeconomic analysis, is a technique that combines exergy analysis with the economic approach (cost). Exergoeconomic analysis is done by sampling Teluk Lembu combined cycle power plant . The analysis begins with the economic analysis. This analysis was conducted to determine the value of the total expenditures of the Teluk Lembu combined cycle power plant per year and electricity prices/kWh. The following four aspects of the calculated cost is the cost of investment, maintenance fixed operating costs, including employee salaries and benefits adjusted to the standard INKINDO 2014, fuel costs, maintenance and operating cost variable. Each value is, the cost of investment of IDR 196.03/kWh, the cost OM fix IDR 69.72/kWh, OM variable costs IDR 34.86/kWh, fuel costs IDR 1072.74/kWh. Loss value cost for combustion chamber is valued at IDR 8,338,282.46/h.Key Word : Exergy, Exergoeconomic, cost
Analisis Exergy Pada Combustion Chamber Pembangkit Listrik Tenaga Gas Uap (PLTGU) Teluk Lembu 30 MW Windy Lusia Samosir; Awaludin Martin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Combustion chamber is one of the main components in the Combined Cycle Power plant (CCPP) that serves as a supplier of heat energy. Then by the system, the thermal energy will be converted into other forms. Combustion chamber is a major cause of irreversibility in the system. Usually, the performance of a component is evaluated by using the first law of thermodynamics (conservation of energy). However, the first law of thermodynamics only assess the quantity of energy consumption. Therefore, exergy analysis is used (based on the second law of thermodynamics is about the entropy changes) which can be studied more deeply about the quality of an energy (energy available; exergy). The aim of this study is to analysze exergy destruction of combustion chamber on Combined Cycle Power Plant (CCPP) 30 MW Teluk Lembu. Exergy analysis on combustion chamber resulting the exergy destruction is 36.46 MW and exergy efficiency is 63.29%.Keywords: combustion chamber, analysis of exergy, exergy destruction, efficiency exergetic
Produksi Bioetanol Dari Nira Nipah Skala 50 Liter Dengan Penambahan Tween 80 Dan Ergosterol Pada Proses Fermentasi Menggunakan Saccharomyces Cerevisiae Widodo, Prio; Chairul, Chairul; Yenti, Silvia Reni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Currently, supply of ethanol was produced globally from sugar and starch. Sugar crops contributed about 61% of total ethanol production while 39% from starch. Nypa sap is one of potential material to be processed to bioethanol. The availability of nypa land is sufficient widely in Indonesia as well as a fairly high sugar content (15-20%) make nypa sap has the potential to be processed into bioethanol as a renewable energy. The aimed of this study was to observe the effect of fermentation time nypa sap with the addition of tween 80 and ergorsterol to bioethanol yield on a scale of 50 liters. Fermentation was carried out in a 70 liter fermenter with a variation of fermentation time about 24, 36, 48, 60, 72, 84, 96 and 108 hours, variations of tween 80 addition about 250 ml and ergosterol as much as 25 grams and without the addition of tween 80 and ergosterol. Effect of addition ergosterol can increase stress tolerance of yeast to osmotic pressure and high bioethanol tolerance in yeast cells. While the effect ofthe addition tween 80 can increase the absorption of ergosterol in plasma membrane and enzymatic accessibility and increasing the level of consumption of glucose in the final stages of fermentation. Fermentation of nypa sap produced the best conditions on the addition of 250 ml tween 80 and ergosterol 25 grams on the fermentation time 96 hours with bioethanol concentration about 16.22% (v /v) or 127.99 mg/mlKeywords: Bioethanol, Ergosterol, Nypa Sap, Saccharomyces Cerevisiae, Tween 80
Pengaruh Perbandingan Eceng Gondok Dan Air Terhadap pH, Alkalinitas, Dan Total Asam Volatil Pada Produksi Biohidrogen Secara Fermentasi Anaerob Tahap Asidogenesis Sari, Devita Ulfa; Ahmad, Adrianto; Muria, Sri Rezeki
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Water hyacinth is one of aquatic weeds that commonly found in water and it grows very fast. Water hyacinth contains fermentable material, named cellulose and hemicellulose and it can be potentially used as a material for bioenergy as biohydrogen. Biohydrogen was produced from water hyacinth using microoorganism derived from cow manure by anaerobic batch fermentation. This research was originally purposed to produce biohydrogen and to determine the optimum water hyacinth to water ratio in their impacts on pH, alkalinity, and volatile fatty acid. Biohydrogen production occurred in three steps: seeding, acclimatization, and anaerobic batch fermentation. Water hyacinth to cow manure ratio was 75%: 25%. Anaerobic fermentation was carried out with variations of water hyacinth to water ratio 1:2, 1:3, 1:4 and 1:5 at initial pH 6 and mesophilic temperature. The most optimum water hyacinth to water ratio in this study was 1:2 with 3.45% biohidrogen product of total biogas.Keywords: anaerobic batch fermentation, biohydrogen, cow manure, water hyacinth
Sintesa Precipitated Calcium Carbonate (PCC) Dari Cangkang Kerang Darah (Anadara Granosa) Dengan Variasi Ukuran Partikel Dan Waktu Karbonasi Lucy Rahmawati; Amun Amri; Zultiniar Zultiniar; Yelmida Yelmida
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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Abstract

Precipitated Calcium Carbonate (PCC) is a product of the processing of natural materials containing calcium carbonate resulting from the precipitation process with high purity. Bloodcockle shell can be used as a source of calcium for precipitated Calcium Carbonate. The purpose of this study to produce PCC of waste shells blood with carbonation method and determine the particle size of the PCC and the best carbonation time. Synthesis performed using carbonation method by adding nitric acid to the slaking process. Blood cockle shell samples prior shells calcined at a temperature of 900°C for 3 hours to form calcium oxide and then dissolved with nitric acid (slaking process) with a particle size variation CaO (+ 20-60; + 60- 100; +100-120) mesh forming CaNO3, then added ammonia to pH 12, the next process of Ca (OH)2 CO2 gas flowing until the time was varied (0.5, 1, 1.5) hours to form a white precipitate which is precipitated Calcium Carbonate. The use of inorganic acids in this study aims to improve the solubility of CaO in the slaking process so that a high yield of the products obtained.The highest yield of PCC obtained at treatment +100-120 mesh particle size and carbonation time of 1.5 hours, with the percentage yield of 88.58%. Results of analysis Atomic Absorption Spectrophotometry (AAS) obtained CaCO3 content of 76.6%. From the pattern of X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) can be seen form the resulting crystal is a mixture vaterit and calcite.Keywords : Blood cockle shell, Method of Carbonation , PCC , Particle Size , ,Time Carbonation

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