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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Pendidikan Teknologi dan Kejuruan Jurnal Sains Materi Indonesia Agrointek Teknika: Jurnal Sains dan Teknologi ROTOR: JURNAL ILMIAH TEKNIK MESIN Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) Journal Of Chemical Process Engineering (JCPE) INVOTEK: Jurnal Inovasi Vokasional dan Teknologi Jurnal Rekayasa Material, Manufaktur & Energi Indonesian Mining Journal Metalurgi Teknomekanik Journal of Materials Exploration and Findings Malcom: Indonesian Journal of Machine Learning and Computer Science Jurnal Indonesia Sosial Teknologi Metalurgi Recent in Engineering Science and Technology Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Soedarsono, Johny W.
Departemen Teknik Metalurgi Dan Material, Fakultas Teknik, Universitas Indonesia, Depok 16426, Indonesia
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation

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Applying Structural Reliability to Risk-Based Inspections of Underwater Crude Oil Pipelines Muhammad Iqbal; Johny Wahyuadi Soedarsono; Gusti Verhan Pratama
Recent in Engineering Science and Technology Vol. 4 No. 2 (2026): RiESTech Vol. 4 No. 2 Years 2026
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v4i2.126

Abstract

This study investigates the application of structural reliability methods in risk-based inspections (RBIs) for subsea crude oil pipelines. Given the increasing reliance on submarine pipeline infrastructure in offshore oil and gas operations, maintaining its integrity is critical to operational safety and environmental protection. This study uses inspection data from smart pigging operations carried out in 2020 and 2024 on 28.7 km of 12-inch underwater pipes. Using API RP 581 (2020) and First-Order Second-Moment (FOSM) structural reliability theory, this study quantitatively assesses the probability of failure (PoF) and the consequence of failure (CoF). Results showed active internal corrosion, with pitting corrosion identified as the dominant degradation mechanism. Risk projections from 2024 to 2030 reveal unacceptable levels of risk in 2030 if mitigation strategies are not implemented. Based on the financial impact and business risk thresholds, a tailored inspection and maintenance strategy is proposed. These findings support the optimization of inspection intervals and highlight the importance of corrosion control measures such as routine pigging and inhibitor injections.
Material selection for raw gas pipeline at SBR#2 gas field Rado Riady; Johny Wahyuadi Soedarsono; Rini Riastuti; Iman Adipurnama
Teknomekanik Vol. 5 No. 2 (2022): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v5i2.13372

Abstract

In engineering design, material selection is the process of choosing the best material for a specific process via a systematic material selection approach. This article described the material selection process for SBR#2 pipeline, which will be installed to flow raw gas from SBR#2 field to the nearest tie-in point. The material selection process starts with design requirement analysis to generate primary function and objectives, including its constraints, determine primary criteria to be evaluated, screen materials candidates based on criteria evaluation, and select the most suitable materials based on very specific requirements. The criteria were evaluated by performing value engineering with the performance criteria matrix tool. Materials selection, in this case, was determined by two main criteria: corrosion resistance and construction ability. Corrosion resistance was evaluated semi-quantitatively by applying NORSOK M-506 2005 spreadsheet, and construction ability were evaluated qualitatively based on field experience. Solid Corrosion Resistance Alloy (CRA)-Stainless Steel 316L pipe is the most suitable for this case.
Preliminary Investigation of Catechin as a Natural Complexing Agent for Selective Recovery of Tantalum and Niobium from Hydrometallurgical Leachate of Bangka Tin Slag 2 Sulaksana Permana; Agustino Zulys; Widiantari Nofriandani; Kurnia Trinopiawan; Riesna Prassanti; Iwan Susanto; Asep Mohamad Noor; Johny Wahyuadi M. Soedarsono
EKSPLORIUM Vol. 47 No. 1 (2026): MAY 2026
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/eksplorium.2026.14940

Abstract

Bangka Tin Slag 2 (BTS 2), a byproduct of tin processing, contains strategic metals such as tantalum (Ta) and niobium (Nb) in oxide forms. This study explores the potential of catechin extract from green tea leaves (Camellia sinensis) as a complexing agent for the recovery of Ta2O5 and Nb2O5 from BTS 2 following a staged leaching process. The material underwent a staged leaching process, defined as a sequential alkali-acid treatment (NaOH followed by HCl) to remove major impurities, followed by hydrofluoric acid (HF) digestion. Catechin was isolated with a yield of 4.73%. Leaching optimization revealed that 4 M HF was optimal, achieving extraction efficiencies of 3.879% for Ta and 23.109% for Nb. Interaction studies using Job’s method showed a 1:1 stoichiometric ratio (metal:ligand) for the complexation. However, catechin exhibited a dominant complexing efficiency with iron (Fe3+) at 12.23%, compared to only 1.55% with Ta5+ and 0.21% with Nb5+. Based on the Hard-Soft Acid-Base (HSAB) theory, this preferential binding occurs because Fe3+ acts as a hard acid that matches perfectly with the hard oxygen-donor phenolic groups of catechin, whereas the highly charged Ta5+ and Nb5+ ions form overly stable fluoro-complexes in the leachate that restrict ligand exchange. These findings indicate that while catechin is a potent complexing agent, its selectivity toward Ta and Nb requires further enhancement or an intermediate iron-removal step.
Catalytic Graphitization of Biomass as a Potential Method Produce Graphite In The Future : A Review Isnanda Nuriskasari; Anne Zulfia Syahrial; Johny Wahyuadi M Soedarsono
Recent in Engineering Science and Technology Vol. 1 No. 2 (2023): RiESTech Vol. 1 No. 2 Years 2023
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v1i02.17

Abstract

The traditional graphitization process involves the use of non-renewable carbon sources and high temperatures, which are time-consuming and expensive. Biomass has been proposed as an alternative renewable source of carbon, which can be graphitized at lower temperatures using transition metal catalysts. The article highlights successful research on graphitization of various biomass carbon sources, such as coconut coir, whey protein, pine wood sawdust, mangosteen peel, miscanthus grass, and palm kernel shell waste, using metals as a catalyst. The graphitization process using catalysts derived from transition metals has been shown to reduce the graphitization temperature, shorten the graphitization time and improve the physicochemical properties of the resulting graphite material.
Effect of Slope Chute Angle of HAP Magnetic Separator to the Acquisition of Nickel Matte from Undersized Product Resulted by Pierce Smith Converter Machine Nurhayati Indah Ciptasari; Egidius Arya Parande; Johny Wahyuadi Soedarsono; Agus Budi Prasetyo; Wahyu Mayangsari; Reza Miftahul Ulum; Ahmad Maksum
Recent in Engineering Science and Technology Vol. 1 No. 3 (2023): RiESTech Vol. 1 No. 3 Years 2023
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v1i03.18

Abstract

The prototype of a magnetic separator was initiated and manufactured for handling undersized products of Pierce Smith Converter which has been channeled to a temporary shelter called a matte pond. It was dredged three to four times a year and it’s costly. This expenditure can be minimized by the manufacture of magnetic separators that are used to attract undersized nickel products. The manufacture of this prototype uses a scale of 1:20.000 for the volume of water and nickel matte, while for chute and magnetic drums with a scale of 1:4 from the conditions in the field. This research aims to determine whether magnetic separators are relevant for installation in the nickel processing industry, with the slope angle of the chute and magnetic power as the main parameters. Thus the matte pond can be minimized and undersized products can be directly processed and distributed to consumers. The material used in the manufacture of this prototype is aluminum sheet 1/16 which is rolled for magnetic drums, aluminum sheet 1/8 in for chute, copper wire 0.5 mm and mild steel, lathe for rods and axis, and bending for magnetic holders. The result of this magnetic separator prototype is 24.48% nickel can be attracted.
Kajian Kombinasi Ekstrak Daun Physalis angulata dan Daun Cassia angustifolia dengan Rasio 50:50 sebagai Green Inhibitor untuk API 5L dalam Larutan HCl 1M: Kajian Green Inhibitor tipe campuran untuk API 5L dalam Larutan HCl Triska Adelia Ni Luh; Khalisha Rizqi Olga Pramono; Johny Wahyuadi Soedarsono; M. Yudi M. Solihin
Recent in Engineering Science and Technology Vol. 2 No. 3 (2024): RiESTech Vol. 2 No. 3 Years 2024
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v2i03.66

Abstract

The effect of combination of Physalis angulata leaf and Cassia angustifolia leaf extract as green inhibitor with a 50:50 ratio for API 5L steel was investigated. This experiment was carried in 1M HCl solution by using different concentrations as variables which is 10 ml, 30 ml, and 50 ml inhibitor extracts. Evaluation of this experiment was performed using potentiodynamic polarization and EIS. The antioxidant compound was investigated using FTIR and was found to be flavonoid. It was found that the capability of the inhibitor to inhibit the steel surface from the environment increases with increasing concentration, which 50 ml concentration is found to have the best efficiency of all concentrations. Combination of Physalis angulata leaf and Cassia angustifolia leaf extract is identified as mixed-type inhibitor with predominant cathodic effectiveness. The adsorption of this inhibitor on the steel surface was predominantly through physisorption and obeyed Langmuir adsorption isotherm.
Bahasa Inggris Hendrik Nemers; Rianti Dewi Sulamet-Ariobimo; Johny Wahyuadi Soedarsono; Muh. Fajar Ramadhan.; Agus Paul Setiawan Kaban; Ahmad Maksum; Theo Thomas; Djoko Nirprawitno
Recent in Engineering Science and Technology Vol. 3 No. 3 (2025): RiESTech Vol. 3 No. 3 Years 2025
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v3i3.98

Abstract

Carbon is an essential element in the iron reduction process. Cokes are used as a carbon source in the traditional reduction process in the beneficiary of iron. When the Ironmaking Technology Mark 3 (ITMk3) method is applied in the reduction process, many carbon sources are used, especially the sources with sustainable and eco-friendly such as coconut shells, palm kernel shells, rice husk, and sugar cane bagasse. Saccharum officinarum or sugarcane extraction produced bagasse as the by-product. Like coconut shells, this rich carbon by-product is not utilized. This work discussed the utilization of bagasse as a reducing agent in the iron reduction process. An analysis is made based on specific reduction temperature with the various ratio of iron to coal. The lump ore is originated from South Borneo. Unlike the coconut shell, in this work, the Baggasse was dried. The process temperature range between 700 and 1000OC. The ratios of ore to bagasse were 1 to 1, 1 to 2, 1 to 3, and 1 to 4. The reduction process was carried out in a muffle furnace. The result shows that the reduction process produced wustite (FeO). This work also compared sugarcane bagasse with other green reducing agents.
Pemanfaatan Campuran Myrmecodia Pendans dan Piper Crocatum Sebagai Green Corrosion Inhibitor pada Inhibitor Kimia Jenis Koktail untuk Proteksi Korosi Baja API 5L Grade B dalam Larutan NaCl 3,5% Rani Kusumawardani; Agus Budiono; Johny Wahyuadi Soedarsono; Yudha Pratesa
Recent in Engineering Science and Technology Vol. 3 No. 3 (2025): RiESTech Vol. 3 No. 3 Years 2025
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v3i3.112

Abstract

Method to prevent the corrosion during pipeline hydrotest using seawater is generally by the addition of inorganic inhibitor containing corrosion inhibitor agent, oxygen scavenger and biocide, so that require to find out the alternative eco-friendly materials with better performance. The main objective of this study is to investigate the efficiency of the use of mixture of extract of Myrmecodia pendans and Piper crocatum as an alternative of eco-friendly inhibitor for reducing the use of inorganic inhibitors for corrosion protection of steel material API 5L Grade B in 3.5% NaCl. The corrosion inhibition ability of natural ingredient extraction are investigated by using tafel polarization test and EIS and verified by weight loss test. The content of the active compounds in natural ingredient extraction along with adsorption compound on metal surfaces and inhibition mechanism are investigated by EIS, FTIR and adsorption isotherm model. In the mixed green inhibitor concentration of 2 ml Myrmecodia pendans and 1 ml Piper crocatum is resulted in approximately 73.66% inhibitor efficiency while concentration of 1 ml chemical cocktail and 2 ml green inhibitor are significantly reduce the corrosion rate from 0.42 mm/year to be 0.03 mm/year with approximately 93.15% inhibitor efficiency. The green inhibitor affected the cathodic as well as the anodic polarization curves which were known as mixed corrosion inhibitor type. The adsorption of compounds contained in the Myrmecodia pendans and Piper crocatum on a metal surface are occur spontaneously follows the Langmuir adsorption isotherm.
Effects of Red Rosela Tea (Hibiscus sabdariffa) as An Organic Inhibitor for Low Carbon Steel in An Environment of Sodium Chloride 3,5% Giafin Bibsy Rahmaulita; Johny Wahyuadi Mudaryoto Soedarsono
Recent in Engineering Science and Technology Vol. 3 No. 4 (2025): RiESTech Vol. 3 No. 4 Years 2025
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v3i04.119

Abstract

Corrosion is an unavoidable phenomenon that is commonly observed in everyday life, particularly in infrastructure and tools constructed from low carbon steel. The corrosion of low carbon steel in chloride-rich environments presents a critical issue across numerous industrial sectors. One widely adopted method for mitigating corrosion involves the application of corrosion inhibitors, chemical substances that even in small concentrations, can significantly suppress the rate of metal degradation in corrosive environments. This research examines the potential of red roselle extract (Hibiscus sabdariffa) as a green corrosion inhibitor for low carbon steel in a 3.5% sodium chloride solution. The corrosion inhibition performance will be evaluated based on weight loss measurements over varying exposure periods of 3, 6, 9, and 12 days. Red roselle tea concentration of 10 g/L will be utilized, supplemented with an additional 2 mL of liquid inhibitor. The results of this study indicate that the maximum corrosion inhibition efficiency reaches 16% after 9 days of immersion, while the lowest efficiency is observed at 8% after 3 days. pH measurements and corrosion potential analysis suggest that red roselle tea contributes to reducing the corrosion rate by forming a protective layer on the surface of low carbon steel.
Study of the Effect of Volume of Moringa Leaves and Purple Sweet Potato Extracts as a Green Corrosion Inhibitor on the Corrosion of API 5L Steel Metals in 0.2 M HCl Environments Kezia; Yudha Pratesa; Tio Angger Pertama; Johny Wahyuadi Soedarsono
Recent in Engineering Science and Technology Vol. 3 No. 4 (2025): RiESTech Vol. 3 No. 4 Years 2025
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v3i04.120

Abstract

This study aimed to investigate the corrosion inhibition mechanism of moringa leaves extract (Moringa oleifera) and purple sweet potato extract (Ipomoea batatas) extract as environmentally friendly inhibitors for low carbon API 5L steel in a 0.2 M HCl solution. Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests were conducted with varying concentrations and combinations of the two inhibitors to evaluate their corrosion inhibition performance. The results indicated that both inhibitors individually function effectively as green corrosion inhibitors. However, their combination did not offer adequate protection for API 5L steel in a 0.2 M HCl environment. FTIR analysis of the inhibitors confirmed the presence of flavonoid compounds in both extracts. Potentiodynamic polarization tests showed that increasing the concentration of moringa leaves extract resulted in a decrease in the corrosion rate and an increase in %IE, with the highest efficiency reaching 73.08%. Similarly, an increase in the volume of purple sweet potato extract also resulted in a reduced corrosion rate, with a maximum inhibition efficiency of 65.31%. However, the combination of both inhibitors led to an increase in the corrosion rate. The results of the EIS test demonstrated that both inhibitors protect the metal by forming a protective film layer on its surface. The adsorption behavior of the inhibitors corresponds to a physical adsorption process and aligns with the Langmuir adsorption isotherm model.
Co-Authors Adelia, Ni Luh Triska Adipurnama, Iman Aditiyawarman, Taufik Adji Kawigraha Agus Budi Prasetyo Agus Budi Prasetyo Agus Budi Prasetyo AGUS BUDIONO Agus Paul Setiawan Kaban Agustino Zulys Ahmad Maksum Ahmad Maksum Andon Insani Angga Pratama Putra, Angga Pratama Anjar Oktikawati Anne Zulfia Anne Zulfia Syahrial Aprizal Aprizal Arif Arif Arif, Chandra Ariyani, Ira Ariyo Suharyanto Asep Mohamad Noor Asfar, Mhd. Ibkar Yusran Astini, Vita Avifa, Venny Nur Azizah Intan Pangesty Badrul Munir, Badrul Bambang Suharno Darnengsih, Darnengsih Debby Rachel Deni Ferdian Djoko Nirprawitno Eddy S Siradj Egidius Arya Parande Eni Febriana Eriyatno . Ersina Rakhma Fachry Abda El Rahman Firman Ady Nugroho Florentinus Firdiyono Giafin Bibsy Rahmaulita Gusti Verhan Pratama Hadi Suwarno Haekal, Teuku Ahmad Haidir, Yuki Hasriyanti Hasriyanti Hendrastuti Hendrastuti Hendrik Nemers Hernowo, Widi Iman Adipurnama Isnanda Nuriskasari Iwan Susanto Januar Irawan Kautsar Muwahhid Kautsar Muwahhid Kezia Khalisha Rizqi Olga Pramono Kurnia Trinopiawan Kurnia Trinopiawan Kurnia Trinopiawan Laksana, Aldi Putra Lalasari, Latifa Hanum Latifa Hanum Lalasari Latifa Hanum Lalasari M. Yudi M. Solihin Mahendra, Mirza Meika Syahbana Rusli Meirawati, Selvia Mhd. Ibkar Yusran Asfar Miftakhur Rohmah Miftakhur Rohmah, Miftakhur Mirza Mahendra Muh. Fajar Ramadhan. Muhammad Iqbal Munira Munira Mustafiah Mustafiah Nadia Chrisayu Natasha Natasha, Nadia Chrisayu Nengsih, Sulistia Nugraha, Cahyo Ady NURBAYANAH, SITI Nurhayati Indah Ciptasari Padmodwiputra, Rendhatya Permana, Sulaksana Pramusanto Pramusanto Purnawarman, Faisal Dwiyana Putra, Budhi Putra, Ivan Fitrian Rado Riady Rafdi Abdul Majid Rafdi Abdul Majid Rakhma, Ersina Ramadhan, Romal Rani Kusumawardani Reza Miftahul Ulum Riady, Rado Rianti Dewi Sulamet-Ariobimo Rianti Dewi Sulamet-Ariobimo, Rianti Dewi Riesna Prassanti Rini Riastuti Rudi Subagja Satria, Bambang Eka Satya Wicaksana Sholihin, Muhammad Yudi Masduky Soelistiyono, Dony Sri Harjanto Suarthana, Eka Juni Sukirna, Iwan Supriyatna, Yayat Iman Theo Thomas Tio Angger Pertama Tri Partuti Triska Adelia Ni Luh Venny Nur Avifa Vika Rizkia Wahyu Kartika Wahyu Kartika Wahyu Mayangsari Wahyu Mayangsari Widiantari Nofriandani Widianto, Shilla Rizqi Wijaya, Arie Wisnu Ari Adi Yarianto Sugeng Budi Susilo Yarianto Sugeng Budi Susilo, Yarianto Sugeng Budi Yayat Iman Supriyatna Yudha Pratesa Yudha Pratesa Yusran asfar, Muhammad Ibkar