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Jurnal Teknologi
Published by Politeknik Negeri Lhokseumawe
ISSN : 14121476     EISSN : 25500961     DOI : http://doi.org/10.30811/teknologi
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Mechanical Engineering
Jurnal Teknologi is a peer-reviewed journal that aims at the publication and dissemination of original research articles on the latest developments in all fields of technology and engineering sciences. The journal publishes original papers in Indonesian and English, which contribute to the understanding of engineering science and the improvement of engineering technology. Papers may be theoretical, experimental, or both, and applied engineering science and technology. The articles submitted to Jurnal Teknologi should be unpublished before and not under consideration for publication elsewhere. The scope of Jurnal Teknologi includes a wide spectrum of technology and engineering science subjects including: Civil engineering; Mechanical engineering; Chemical engineering Electrical engineering; Information and technology; Computer science and engineering; Materials science and engineering; Renewable energy engineering;
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 136 Documents
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Studi Kasus Pengaruh Perbedaan Spesifikasi Fuel Gas terhadap Kinerja Pembakaran Thermal Oxidizer Unit di PT X Muhammad Fiqih Alif Utama; Ratni Dewi; Sariadi Sariadi
Jurnal Teknologi Vol 23, No 2 (2023): Oktober 2023
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v23i2.4334

Abstract

Fuel gas is a term used by the industry to refer to fuel in physical form or gas form. The type of fuel used in the thermal oxidizer at the Sulfur Recovery Unit (SRU) plant is fuel gas. The thermal oxidizer is a device that functions to oxidize residual H2S, elemental sulfur, and CO2 derived from the sour gas purification process. Currently, the reliability of the thermal oxidizer in operation needs special attention by management and the operations team because the ability of the refractory in the Thermal Oxidizer unit to maintain combustion heat is not optimal and stable so the combustion heat has touched the thermal oxidizer at several points to cause cracks and leaks. The purpose of this study is to analyze the effect of differences in fuel gas specifications on combustion performance and heat energy formed in the thermal oxidizer unit, to analyze the effect of differences in fuel gas specifications on increasing the operating temperature and reliability of the thermal oxidizer and to analyze the impact of the risk of implementing different gas usage on operations at the SRU plant. The method used in the research is causal comparative where observations are made of data from factors that are thought to be the cause as a comparison of differences in the use of fuel gas. In this study LP fuel gas is the best fuel usage option because it is more efficient and controlling the risk level can be done optimally with the use of LP fuel gas.
Analisis Kebutuhan Pelumasan saat Kegagalan Sistem Kelistrikan (Black Out) pada Kompresor Boil Off Gas (K-6801) pada Fasilitas LNG Hub Razi Nainal; Muhammad Yunus; Saifuddin Saifuddin
Jurnal Teknologi Vol 23, No 2 (2023): Oktober 2023
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v23i2.3831

Abstract

The lube oil system in the compressor plays an important role for any rotating equipment because it functions to provide lubrication against the effects of friction on various rotating equipment. This overhead tank works by gravity to distribute lubricating oil from operating speed to zero rpm. The large volume of lube oil provides lubrication to the compressor bearings when the normal circulating flow from the pump stops and is assisted by the backup flow from the overhead tank. The purpose of this approach is to calculate the need for lubrication when an electrical fault occurs in the Boil-off Gas compressor (K-6801). Based on the results of analysis and calculations where the Boil-Off Gas Compressor (K-6801) is the object of observation, the amount of lubricating oil needed for the remaining rounds is 1885 liters while the amount of lubricating oil available in the field is 1528,286 liters. From the calculation results, 1528,286 liters is sufficient based on the reference API Standard 614 edition 4, chapter 2, Section 1.4.10.2 because it has exceeded the 20% reduction from 1885 liters, namely 1508 liters. The height of the overhead tank that is suitable for flowing lubricating oil to the compressor bearings is 5.2588 meters above the compressor with a distribution pipe diameter of 3 inches and an orifice bore diameter of 1 inches.
Pembuatan Briket Komposit Cangkang Sawit dan Tempurung Kelapa dengan Variasi Perekat Tepung Tapioka sebagai Bahan Bakar Alternatif Nurhamida Nurhamida; Rusdianasari Rusdianasari; Mustain Zamhari
Jurnal Teknologi Vol 23, No 2 (2023): Oktober 2023
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v23i2.4148

Abstract

Waste from the agricultural sector in Indonesia that may be used as fuel is plentiful, but it is not well utilized by the community. The usage of wood charcoal fuel, which is extensively utilized as an energy source, would undoubtedly have a detrimental influence on the environment if used directly and constantly without passing through a particular process. Furthermore, as the consumption of oil and gas energy sources grows, the availability of oil and gas energy sources will become progressively reduced. This problem may be solved by converting it into ecologically beneficial charcoal briquettes and promoting the use of biomass waste in agriculture. Charcoal briquettes are an environmentally friendly source of biomass energy made by bonding mashed materials (such as sawdust, coconut shells, palm shells, rice husks, corn cobs, and other combustible materials) into solid blocks that are compressed under pressure using a binder in the form of tapioca flour solution. The purpose of this research is to evaluate the properties of composite briquettes made of palm kernel shells and coconut shell charcoal so that they may be utilized as alternative fuels to replace fossil fuels. The method used in this study is an experiment with qualitative analysis. Based on the results of the examination, the greatest proximate studied had the following characteristics: water content of 6.5%, ash content of 7%, flying substance content of 21%, and calorific value of 5448.1737 The findings obtained are consistent with the quality standards of charcoal briquettes established by SNI No. 01-6235-2000.
Pembuatan Pestisida Nabati dari Daun (Balakacida, Serai dan Sirsak) dengan Perbandingan Penambahan Surfaktan dan Tanpa Surfaktan Dinda Amalia; Sariadi Sariadi; Zulkifli Zulkifli
Jurnal Teknologi Vol 23, No 2 (2023): Oktober 2023
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v23i2.4471

Abstract

Production of vegetable pesticides from leaves (lemongrass, balakacida, and soursop) with a ratio of surfactant addition and no surfactant is carried out by liquid-solid extraction. This research aims to influence the effect of the use of leaf types and the use of surfactants and without surfactants with differences in maceration time on the quality of the vegetable pesticides produced. The research method was carried out by maceration extraction which would release flavonoid compounds and a mortality test was carried out on black ants (Dolichoderus thoracicus). The research results obtained from the three raw materials, namely balakacida leaves with the addition of surfactant, were the best results which desired to achieve a lethal dose (LD 100) with all test ants dead, whereas, without the addition of surfactant, it only reached the middle lethal dose (LD 50). As the maceration time increases, the number of ant deaths increases. The characteristics of vegetable pesticides produced from flavonoid levels have a positive correlative relationship to the mortality of black ants (Dolichoderus thoracicus). So what was obtained in the test for flavonoid compounds produced an orange/yellow color and there were functional groups OH, C-H, N-O, N=C=S, and C=C.
Sistem Pakar Diagnosa Penyakit Lambung Menggunakan Metode Certainty Factor Dwi Ranti; Anita Desiani; Sugandi Yahdin; Syafrina Lamin
Jurnal Teknologi Vol 23, No 2 (2023): Oktober 2023
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v23i2.3887

Abstract

The digestive system is very important for humans, there are several digestive systems, one of which is the stomach. The main function of the stomach in the digestive system is to store and digest food before it is absorbed by the body's cells as a source of energy. A healthy lifestyle in life is very important, including maintaining a diet, not eating carelessly, and getting enough rest. An unhealthy life will also trigger various diseases, one of which is gastric disease. Early and accurate diagnosis of kidney disease can aid in timely and effective management of the condition. an expert system for diagnosing gastric disease with the CF (Certainty Factor) method to assist people in diagnosing gastric disease along with advice based on perceived treatment symptoms. This study aims to develop an expert system for diagnosing kidney disease using the CF method. The developed system consists of components of data collection, data storage, and data processing, with the CF method used to calculate the diagnosis level of confidence and make decisions based on predetermined rules. The CF (Certainty Factor) method shows a measure of certainty about a fact, it is known that user 1, user 3, user 4, and user 5 have the highest proportion of gerd disease, namely 36.7%, 38.8%, 48.9%, 47.6%. While user 2 has the highest proportion of stomach cancer with 24.8%. So this study only has an accuracy rate of 80%. Diagnosis can be an alternative to early detection of several types of gastric disease.
Identifikasi Bahaya dan Risiko di Laboratorium SMKN 1 Tanah Luas Menggunakan Metode HIRA Sharie Suhaila Kyungsoo; Cut Aja Rahmahwati; Faridah Faridah
Jurnal Teknologi Vol 23, No 2 (2023): Oktober 2023
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v23i2.4143

Abstract

When carrying out practical activities carried out in the laboratory, the activity process does not always run as expected. There are times when the process experiences certain problems, one of which is that the practicum stops because the equipment is not functioning properly, causing accidents such as fires or explosions, students who carry out the practicum experience injuries that they get while carrying out the practicum in the laboratory. The purpose of risk assessment is to determine the possibility of occurrence and impact of an event that hinders the achievement of the organization's goals or objectives so that risks can be handled appropriately. This goal can be achieved through risk identification and risk analysis. The benefits of risk assessment include: helping to achieve organizational goals, maintaining continuity of service to stakeholders, providing services effectively and efficiently, being the basis for preparing strategic plans, and avoiding waste. The HIRA method was chosen because this method will identify, assess, and control dangerous risks that have the potential to occur in all work activities. This method can see how big the potential is and how serious it will be if the danger occurs. After identifying hazards using the HIRA method in the laboratory environment of SMK N 1 Tanah Luas. In calculating the level of possible hazards, the parameter for the frequency of occurrence of dangers in the High category is: every time the work is carried out. Medium category, namely: once in 10 to 100. Low category, namely once as long as the work is carried out.
Analisa Kinerja Heat Recovery Steam Generation Akibat Perubahan Load Turbin Power Generator untuk Proses LNG Hub dan Efisiensi Operasional di Perusahaan Migas Muchlis, Muchlis; Sariadi, Sariadi; Harunsyah, Harunsyah
Jurnal Teknologi Vol 24, No 1 (2024): April 2024
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v24i1.5197

Abstract

Problems that occur with the HRSG will be calculated and performed by performance analysis of the equipment. With various methods and formulas that will be used. The aim of the research is to calculate HRSG efficiency before and after cleaning in power generation systems using Matlab software, determine the effect of HRSG efficiency before and after cleaning and understand how to optimize HRSG performance. HRSG efficiency calculations in this research were carried out by comparing the energy flow rate used to evaporate water, both in low pressure steam and high pressure steam and the energy flow rate contained in the exhaust gas from the gas turbine power plant system which is useful in HRSG. HRSG performance calculations based on changes in load for LNG hub operational business processes and operational efficiency in power usage, such as calculating mass balance, calculating energy balance, calculating HRSG performance efficiency in LNG hub operational conditions, calculating HRSG performance efficiency in actual conditions after the event LNG hub process and efficiency of power use in operations, comparison between HRSG performance efficiency in actual conditions and design data efficiency at commissioning. So the results obtained were an efficiency of 61.37% and there was a decrease in performance after being compared with the commissioning design data of 38.32%.
Sintesa Biokoagulan dari Chitosan dan Biji Kelor (Moringa Oleifera) untuk Menurunkan Kandungan Senyawa Organik dalam Limbah Cair Tahu Safitri, Putri Destia; Satriananda, Satriananda; Adriana, Adriana
Jurnal Teknologi Vol 24, No 1 (2024): April 2024
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v24i1.4990

Abstract

Tofu liquid waste contains high organic compounds that potential to pollute water bodies, so it must be treated before being discharged into the environment. This research investigated the processing of tofu liquid waste using natural coagulants Chitosan and Moringa seeds to remove organic compounds in tofu wastewater. The ratio of chitosan to moringa seeds was varied 0:100; 25:75; 50:50; 75:25 and 100:0%. Jar test method has been employed to conduct the experiment, in which the process of fast stirring was 120 rpm for 1-minute, slow stirring was 20 rpm for 20 minutes, and settling time were varied for 1, 2 and 3 hours. The variables measured include Chemical Oxygen Demand (COD), turbidity, pH and Total Disolved Solid (TDS). The best results were obtained at a coagulant ratio of 100:0 with a weight of 1 gram of chitosan and 0 gram of Moringa seeds at a deposition time of 3 hours. Under these conditions the removal of COD reached 71.87%, turbidity removal 81.65%, pH 5.7 and TDS removal 76.32%.
Ekstraksi Kalium dari Abu Kulit Buah Alpukat (Persea Americana Mill) Menggunakan Pelarut Aquades Mastura, Dewi; Zaini, Halim; Sami, Muhammad
Jurnal Teknologi Vol 24, No 1 (2024): April 2024
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v24i1.5043

Abstract

One of the primary ingredients in avocado peel skin ash (Persian americana mill) is potassium, which can be utilized as an alkali source while producing soap. Avocado skin has a high potassium potential, which makes it ideal for extraction. Burning the potassium first and then continuing the extraction with distilled water as a solvent are two methods for obtaining potassium. In this investigation, the avocado peel was dried for 24 hours at 110 °C. A crusher is used to crush dried avocado skin into a powder that is then burned in a furnace for 5 hours at 500oC to create avocado skin ash. Variable extraction times are 30 minutes, 60 minutes, and 90 minutes, and the variable mass of avocado skin ash employed in this procedure is 5 g, 7.5 g, and 10 g. The variables for the extraction temperature are 60ºC, 70ºC, 80ºC. The optimum ash mass condition for this method is 7.5 gr, the best extraction temperature is 80oC, the best extraction duration is 90 minutes, and the best potassium concentration is 0.3 N. X-Ray Diffraction (XRD) analysis reveals that the predominant component in avocado skin ash is K2O.
Kombinasi Proses Koagulasi dan Aerasi Menggunakan Biji Asam Jawa (Tamarindus Indica) sebagai Biokoagulan pada Limbah Cair Industri Tempe Nahrawi, Muhammad; Dewi, Ratni; Harunsyah, Harunsyah
Jurnal Teknologi Vol 24, No 1 (2024): April 2024
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v24i1.4845

Abstract

The impact of the tempe industrial wastewater which has an organic content value if discharged directly into water bodies will endanger the environment. This is due to the large number of pollutant substances present in wastewater, which will cause a decrease in dissolved oxygen levels in wastewater. The purpose of this study was to determine the effect of the dose and timing of tamarind seed bio coagulant on the reduction of chemical oxygen demand (COD), total dissolved solid (TDS), conductivity, turbidity, and pH in tempe industrial wastewater. This research was started by reducing the size of tamarind seeds (brown) so that they became powder, after which they were sieved using an 80 mesh sieve and heated in an oven at 105 ⁰C for 2 hours to reduce the water content. The next process is coagulation and aeration by varying the mass of coagulant 5; 15; 25; 35; and 45 g and time variation of 15; 30; 45; 60; and 75 minutes. Based on the research results, it was found that the water content of tamarind seed powder was 8%, the optimum time and dose were at 75 minutes and 45 g with the percentage of removal of COD, turbidity, TDS, conductivity, and pH each of 97.5%; 61.48%; 19.89%; 16.39%; 3.8. The results of the FTIR characterization of the initial sample obtained a vibrational peak of 3172.90 cm⁻ˡ for the carboxylic acid compound identifying the O-H functional group. And experienced a new vibrational peak after the coagulation and aeration process, namely the alcohol compound identified the vibrational O-H functional group of 3876.92 cm⁻ˡ. From these results, it can be concluded that the tamarind seed bio coagulant can reduce the contaminants in the tempe industrial wastewater.

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