International Journal Applied Technology Research <p>The International Journal of Applied Technology Research (IJATR), an academic journal in engineering and technology, was published by Bandung State Polytechnic, Indonesia. This OPEN ACCESS Journal aims to encourage and stimulate the exchange of discourse among professionals and academics worldwide on issues of applied technology research.</p> Bandung State Polytechnic (Politeknik Negeri Bandung) en-US International Journal Applied Technology Research 2721-7582 <div id="main-content" class="page page_submissions"> <div class="copyright-notice about_data"> <p><strong>Author’s Warranties<br></strong>The author warrants that the article is original, written by the stated author(s), has not been published before, contains no unlawful statements, does not infringe the rights of others, is subject to copyright that is vested exclusively in the author and free of any third party rights, and that any necessary written permissions to quote from other sources have been obtained by the author(s).</p> <p>&nbsp;</p> <p><strong>Copyright&nbsp;<br></strong>The copyright is transferred to Publishers. As a publication condition, the authors must grant the IJATR the right to distribute their manuscripts to the broadest possible readership online/electronic format. In this term, the corresponding author must fill out the Copyright Transfer Agreement that we have provided. If the article is written by several authors, the first author must know and agree to them.</p> <p>&nbsp;</p> <p><strong>User Rights</strong><br><span data-preserver-spaces="true">The International Journal of Applied Technology Research (IJATR) objective is to disseminate articles published as freely as possible. Under the&nbsp;</span><a class="editor-rtfLink" href="" target="_blank" rel="noopener"><span data-preserver-spaces="true">Creative Commons Attribution License (CC BY-SA 4.0),</span></a><span data-preserver-spaces="true">&nbsp;this journal permits users to share (copy and redistribute the material in any medium or format) and adapt (remix, transform, and build upon the material) the work for any purpose, even commercially with an acknowledgment of the work's authorship and initial publication in IJATR. Users will also need to attribute authors and this journal to distributing works in the journal. Authors can enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in IJATR. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges and earlier and greater citation of published work.</span></p> </div> </div> Edge Crack in Longitudinal Butt-Welded Joint in Thick-Wall Cylinder <p>Thick-wall vessels and pipes cylindrical shape are very typical in power plant, chemical, processing, oil and gas industry. The equipment with cylindrical shape can be either thin or thick wall which depends on the function of that particular equipment. Typically, thick-wall cylinder is used when the equipment is needed to accommodate high pressure contents. Mostly, cracks appear either on the internal or external of a thick-wall cylinder. Primarily, when welding is applied in the fabrication of the thick-wall cylinder, cracks can easily appear due to solidification or hydrogen embrittlement at the welded joint, typically butt-welded joint. Hence, it is critical to examine the stress distribution along the crack and resolve the stress intensity factor of the cracks in both welded and non-welded internally pressurized thick-wall cylinder. Finite element analysis has been conducted using the engineering software, ABAQUS CAE to investigate the stress distribution and to perform the evaluation of stress intensity factor. Besides, weight function method has also been used by other researchers to determine the factor of stress intensity for both welded and non-welded thick-wall cylinder. The results were compared in terms of both of the methods applied. The last, the effect of the butt-welded joint profile in thick-wall cylinder has also been investigated.</p> Yunan Prawoto Rachmad Imbang Trittjahjono ##submission.copyrightStatement## 2021-10-01 2021-10-01 2 2 66 80 10.35313/ijatr.v2i2.56 Evaluation of Biological Degraded Keratin for Biogas Production Using Dry Anaerobic Digestion System <p><em>Anaerobic digestion is a methane gas production process that can be used as sustainable alternative energy. Anaerobic digestion utilized various types of organic waste as substrate for the reaction process. Keratin waste is an organic waste mainly produced from the poultry and farming industry. Pretreatment is usually required to hydrolyzed keratin protein complex as the amino acid is easily used as the substrate in anaerobic digestion reaction. Biological pretreatment was selected because it more energy saver and generating diverse types of amino acid monomers. Three types of keratins used in this research were feathers, wool, and hair. Culture of Bacillus sp. C4 were inoculated into keratins and incubated for 24 hours, 48 hours, and 72 hours. The chicken feathers produce the soluble protein as much as 7.23 mg/ml, 32.59 mg/ml and 45.99 mg/ml respectively, while the sheep wool produce 24.08 mg/ml, 36.73 mg/ml and 38.75 mg/ml respectively according to incubation time. Meanwhile, keratin hair cannot be degraded by Bacillus sp. C4 at all. Free ammonia formed by hydrolysis of proteins is suspected to be an inhibitor in the methanogenesis process, as total methane produced from degraded keratin only 256,6 ml C4/gr VS in 36 days retention time</em><em>.</em></p> Sinta Setyaningrum Regina J Patinvoh Ronny Purwadi Mohammad Taherzadeh ##submission.copyrightStatement## 2021-10-01 2021-10-01 2 2 81 89 10.35313/ijatr.v2i2.49 Using Homer Software for Cost Analysis of Stand-Alone Power Generation for Small Scale Industry in Nigeria: A Case Study Lumatec Aluminium Products <p>Nigeria is one of developing countries in the world that experience shortage of electricity for her economic and social development. In Nigeria, most of the small-scale industries use diesel/petrol-based systems to generate their electricity. However, due to the cost fluctuation of oil and gas fuel, an alternative power generation should be considered. This paper targets to examine the cost analysis of system for supplying electricity to LUMATEC Aluminium products shop in Mubi, Adamawa state Nigeria. Hybrid Optimization Model for Electric Renewable (HOMER) is used as a tool for cost analysis. The scenario consider in this study was only stand-alone with battery system. Results revealed that the system have 10kW PV with cost of electricity (COE) of $0.312/kW. The initial capital cost and total net present cost (NPC) are $21.775 and $26.148 respectively, with payback period of 5.8years. In conclusion, this study provides the solution of power supply to the small-scale industries at cost effective and available throughout the year and it is feasible to solve the small-scale industries, rural and urban electricity supplying in this country (Nigeria). It is recommended that Nigerian Government &amp; Law makers should promotes the use of standalone PV system for domestic and small-scale industry by providing financial assistance through soft loans, subsides and grants.</p> Luqman Raji Zhigilla Y.I Wadai J ##submission.copyrightStatement## 2021-10-01 2021-10-01 2 2 90 102 10.35313/ijatr.v2i2.57 The Analysis of Development Natural gas-based Petrochemical Industry in Teluk Bintuni Regency <p><strong>ABSTRACT</strong></p> <p>The petrochemical industry, especially the petrochemical industry in Teluk Bintuni Regency, West Papua Province, is an industry engaged in natural gas processing by considering the needs of the Upstream Plastic Product Industry Market and its use in supporting human activities. It is hoped that the integration of the upstream-downstream industry can build a strong supply chain. This is in line with the application of industry 4.0 according to the roadmap of Making Indonesia 4.0, which aims to increase the competitiveness of the national industry in the global arena. Examples of upstream petrochemical industry products include methanol, ethylene, propylene, butadiene, benzene, toluene, xylene, coproduct fuels, petrol pyrolysis, fuel oil pyrolysis, raffinate, and C4 mixtures. The analysis developed is using an Industrial Tree Model and porter's value chain analysis and supply chain analysis. The results of this research are seven points.</p> <p>&nbsp;</p> <p>&nbsp;</p> Dedy Setyo Oetomo Rizky Fajar Ramdhani ##submission.copyrightStatement## 2021-10-01 2021-10-01 2 2 103 126 10.35313/ijatr.v2i2.47 Experimnetal Investigation on Outdoor and Indoor PM2.5 and PM10 in Supermarkets in Bandung During Covid-19 Pandemic <p>During the Covid-19 pandemic, the number of visitor at the trade center in Bandung was much reduced as compared to before pandemic, which was only about 30% of normal conditions. The present study is to investigate particulate concentrations of PM2.5 and PM10 in three supermarkets in Bandung, namely Kosambi, Batununggal Modern and Cinunuk supermarkets during the pandemic of Covid-19. Air sampling was measured using a particulate counter CEM DT96 for 11 hours, from 06:00 AM to 5:00 PM, local time. The results showed that the average of outdoor and indoor concentrations of PM10 in two supermarkets (Batununggal Modern and Griya Cinunuk) was lower than standard during that 11 hours.&nbsp; As for the outdoor concentrations of PM2.5, both markets exceeded the standard for several hours in the morning. In general, it can be concluded that the outdoor and indoor concentrations of PM2.5 and PM.10 during pandemic were below the standard, except in the morning before 10:00 AM</p> Kasni Sumeru Toto Tohir Neni Emrida Panjaitan Mohamad Firdaus bin Sukri ##submission.copyrightStatement## 2021-10-01 2021-10-01 2 2 127 135 10.35313/ijatr.v2i2.52 Relationship Between Indoor Air Quality and Sick Building Syndrome in Post Office Building in Bandung <p>Sick building syndrome (SBS) is a collection of symptoms experienced by buildings occupants such as headaches, mucous, membrane irritation, respiratory problems and fatigue. A building is claimed to have SBS if more than 20% of building occupants experience symptoms. Poor indoor air quality contributes to SBS in the building. This study aims to investigate the correlation between indoor air quality and SBS symptoms in 1st and 2nd floors of the Post office building in Bandung. The study used quantitative methods with a cross sectional study design. Data collection was carried out using particle counter, thermometer, lux meter and anemometer to measure the indoor air quality, while the questionnaire utilized random sampling technique with 119 respondents. The results of the primary data were compared with the air quality standard from Minister of Health No. 1077, 2021. The results of the Statically Compare Means and Independent T-test showed that the p-values of the temperature on the 1st floor and 2nd floors were 0.437 and 0.000, respectively. Meanwhile the p-values of PM10 and PM2.5 on the 1st and 2nd floors were 0.005 and 0.290 and 0.004 and 0.364, respectively, and the p-values of the lighting on the 1st and 2nd floors were 0.002 and 0.015. It indicates that there is a significant relationship between concentrations of PM10 and PM2.5 on the 1st floor with SBS symptoms and the temperature and humidity on the 2nd with SBS symptoms. Since 29 peoples (24% of the building’s occupants) experienced SBS, the building was considered to have a significant potential to cause SBS to its occupant.</p> Yudi Prana Hikmat Ismail Wellid Kasni Sumeru Salma Dzakiyah Az-zahro Mohamad Firdaus bin Sukri ##submission.copyrightStatement## 2021-10-01 2021-10-01 2 2 136 145 10.35313/ijatr.v2i2.53