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All Journal Jurnal Sains Materi Indonesia JURNAL INTEGRASI PROSES Prosiding Semnastek Jurnal Kimia Terapan Indonesia Makara Journal of Technology Prosiding Seminar Nasional Rekayasa dan Teknologi (TAU SNAR- TEK) JURNAL REKAYASA KIMIA & LINGKUNGAN
Asep Handaya Saputra
Departemen Teknik Kimia, FT - UI Kampus Baru UI, Depok, 16424
Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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Journal : Makara Journal of Technology

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Muara Bekasi – Muara Tawar Offshore Transmission Pipeline Routing and Economic Analysis. Saputra, Asep Handaya; Ardiansyah, Ardiansyah
Makara Journal of Technology Vol. 13, No. 1
Publisher : UI Scholars Hub

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Muara Bekasi – Muara Tawar Offshore Transmission Pipeline Routing and Economic Analysis. Power plant Muara Tawar will substitute the need of oil fuel to gas as form of economizing and energy conservation. The nearest supply point to fulfill natural gas needed on Muara Bekasi. So that Power Plant Company needed to develop gas pipeline infrastructure to joining the point.The purpose of this study is to create a system of gas transmission pipeline from gas supply point at Muara Bekasi to Power Plant Muara Tawar trough to offshore area. Design of gas transmission pipeline is started with technical data collection and supply-demand analyzing, continued with data analysis, rute construction and result of condition operation. The standard design of this design is DnV 2000. Gas demand in Power Plant Muara Tawar is 400 MMSCFD. From secondary data had been obtained total length of alternative route 3.7 km. Carbon Steel pipe diameter which had been used 22 inch nominal diameter. Gas supply pressure is 350 psig with pressure of demand point is setted on 500 psig. On pipeline system design the preesure before put in to compressor is around 321.7 psig. The design on bottom stability factor is the main concern. From the design calculation the total minimum pipe weight is 793.16 ton, whereas the design around 932.6 ton. Therefore, the pipe will be stable on bottom of sea.
Effect of Fly Ash Fortification in the Manufacture Process of Making Concrete towards Characteristics of Concrete in Sulfuric Acid Solution Saputra, Asep Handaya; Shohibi, Muhammad; Kubouchi, Masatoshi
Makara Journal of Technology Vol. 19, No. 3
Publisher : UI Scholars Hub

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Fly ash is a silica or alumino silica material that can be used as a constituent of cement in the concrete manufacturing process. Utilization of fly ash aims to improve durability and minimize the reduction of concrete’s compressive strength exposed to an acidic environment, which can be achieved through the pozzolanic reaction of fly ash with Ca(OH)2 within concrete. The reduced content of Ca(OH)2 through pozzolanic reaction will minimize the tendency of ettringite formation (compounds that cause deterioration and decrease the compressive strength of concrete). In order to determine the relation between fly ash replenishment into concrete with concrete’s characteristics (compressive strength and durability) under acidic environment, the research is conducted by varying the fly ash composition ranging from 0%, 5%, 25%, 50%, up to 75%, and the concentration of H2SO4 solution as an immersion medium ranging from 0%, 5%, 10%, up to 15% (v/v). The research is carried out by immersing the concrete samples for 4 days in H2SO4 solution with various concentrations. Characterization of concrete’s durability and compressive strength is reviewed from the concrete’s weight loss percentage and reduction of concrete’s compressive strength percentage after immersion. Based on the research results, for each variation of H2SO4 concentration used, the minimum concrete’s weight loss percentage (maximum durability) and the minimum reduction of concrete’s compressive strength percentage is found in the use of fly ash by 75%. For each concentration variations of H2SO4 solution as an immersion medium ranging from 5%, 10%, up to 15% (v/v), the minimum concrete’s weight loss percentage was 0.47%, 0.87%, 1.28% (respectively), whilst the minimum reduction of concrete’s compressive strength percentage was 5.71%, 14.29%, 17.14% (respectively). It was concluded that the use of fly ash can improve the durability and minimize the reduction of compressive strength of concrete exposed to an acidic environment.
Co-Authors Adi Cifriadi, Adi Agus haryono Agus Haryono Agus Haryono Alia Badra Pitaloka Antika, Fitria Mega ARDIANSYAH ARDIANSYAH Ayyi Husbani Cindy Dianita Cindy Dianita, Cindy Dadi R. Maspanger, Dadi Evi Triwulandari Evi Triwulandari Fariza Ahmad Satriaperdana Hana Nabila Anindita, Hana Nabila Joddy Arya Laksmono Johan Johan Khairunissa, Puteri Amelia M. Hilman Anshari Masatoshi Kubouchi, Masatoshi Mohammad Nasikin Muhammad Ghozali Muhammad Ghozali Muhammad Shohibi, Muhammad Nur Anis Hidayah Puteri Amelia Khairunissa Setijo Bismo Tuti Indah Sari, Tuti Indah Vicario Burhan