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All Journal Jurnal Sains Materi Indonesia Jurnal Kimia dan Kemasan Jurnal Teknik Mesin EPI International Journal of Engineering Journal of Materials Exploration and Findings Recent in Engineering Science and Technology
Yudha Pratesa
Department Of Metallurgy And Materials Engineering, Universitas Indonesia
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Journal : Recent in Engineering Science and Technology

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Pengaruh kadar karbon pada material logam mampu luruh Fe-35Mn-C hasil metalurgi serbuk dengan kalium karbonat sebagai agent pembuat foam Pratesa, Yudha; Setyaningrum
Recent in Engineering Science and Technology Vol. 2 No. 03 (2024): RiESTech Volume 02 No. 03 Years 2024
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v2i03.73

Abstract

: A Fe-35Mn-1C alloy with a foam structure, incorporating 5% potassium carbonate (K2CO3), was successfully synthesized, demonstrating an austenite phase and an acceptable degradation rate for an implant candidate. However, excessive carbon content led to the formation of a graphite phase and increasing hardness. To address this, variations in lower carbon composition (0% and 0.5%) were explored to enhance mechanical properties and achieve a fully austenite phase with non-magnetic properties. Mechanical alloying of the powder materials was performed using the rotary mixing method and was followed by sintering process in argon atmopher. The sintered samples underwent comprehensive characterization, including physical, chemical, mechanical properties, and degradation behavior. The Fe-Mn-C biomaterial exhibited an austenite and manganese oxide phase with a favorable degradation rate. This study showed K2CO3 is not only as a foaming agent but also could contribute to carbon alloying into the Fe-Mn alloy system.
A New Approach to Risk Assessment Model and Management for Jetty Fuel Terminal Industrywide Using Risk Priority Number Silalahi, Yoseph Valentino; Munir, Badrul; Pratesa, Yudha
Recent in Engineering Science and Technology Vol. 3 No. 01 (2025): RiESTech Volume 03 No. 01 Years 2025
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v3i01.92

Abstract

Jetty is an essential part of a fuel terminal and oil distribution process in terms of loading and unloading oil from and to tanker. Jetty has been widely used in fuel supply point facilities in archipelago countries like Indonesia. The increase in the importance given to maritime transportation has not only resulted in the development of the structure of safety issues but has also led to new investigations into the design of ships, the configuration of ports, and the operations conducted, all of which are essential components. However, it is not possible to ignore the risk inherent in jetty fuel terminal operations. Most of the reseach have pre-dominantly focused on the operation and impact of ship maneuvers and ship operations. But focusing on the jetty fuel risk itself is also very important as a whole part of reliability of a fuel receiving facility. FMEA is frequently used as a risk analysis method in determining risks arising from oil and gas sector. Each category of Severity, Occurance, and Detection from each risk factor can be rated to obtained the Risk Priority Number value. Mooring facilities assessment furthermore provides the implementation of assessment (grading) of operational suitability of jetties, based on the results of a visual assessment and special inspections. This paper aims to identify the risk associated with and to analyze these risk using Risk Priority Number ranking.
Wire Rope Sling Failure Analysis: Technical Root Causes, Investigation Methodology Critique, and Lessons for Lifting Safety and Organizational Learning Zaky, Ahmad; Pratesa, Yudha; Mudaryoto, Johny Wahyuadi
Recent in Engineering Science and Technology Vol. 3 No. 03 (2025): RiESTech Volume 03 No. 03 Years 2025
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v3i3.111

Abstract

Wire rope slings are critical in heavy lifting operations, yet their failure remains a persistent safety concern. This paper presents a case study of a catastrophic sling rupture that occurred during a heavy lifting trial, despite the lift being within its rated capacity. A multi-faceted failure analysis identified hidden corrosion fatigue at the sling’s ferrule and an unanticipated extreme overload condition as the primary technical root causes. Procedural and organizational factors—including inadequate risk assessment, deviation from critical lift protocols, and failure to act on prior lessons—also contributed to the incident. The contractor’s investigation is critically reviewed against best-practice Root Cause Analysis guidelines, highlighting both strengths and gaps in its methodology. Key lessons to improve lifting safety are discussed, such as implementing rigorous inspection and retirement criteria for aging slings and ensuring comprehensive lift planning. Overall, the case underscores the importance of robust investigation practices and effective organizational learning to prevent similar failures in the future.
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. 03 (2025): RiESTech Volume 03 No. 03 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.
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; Pratesa, Yudha; Pertama, Tio Angger; Soedarsono, Johny Wahyuadi
Recent in Engineering Science and Technology Vol. 3 No. 04 (2025): RiESTech Volume 03 No. 04 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 A. Zakiyuddin AGUS BUDIONO Ahmad Ivan Karayan Ahmad Zaky, Ahmad Aji Wibisono Andika Purnawidhi Badrul Munir Badrul Munir, Badrul Deni Ferdian Fadlilah, Muhammad Iqbal, Adimas Habib Johny Wahyuadi Soedarsono Johny Wahyuadi Soedarsono Kezia Mudaryoto, Johny Wahyuadi Noviardi, Luthfi Nuringtyas Rahwinarni Pertama, Tio Angger Pragitta, Riene Kaelamanda Rani Kusumawardani Setyaningrum Silalahi, Yoseph Valentino Sri Harjanto Vika Rizkia Wahyuaji Narottama Putra Yunita Sadeli