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Journal of Materials Exploration and Findings
Published by Universitas Indonesia
ISSN : -     EISSN : 29625475     DOI : https://doi.org/10.7454/jmef
Core Subject :
JMEF publishes publications that report on R&D discoveries and fundamental understanding of phenomena with potential significance, as well as those that explore solutions to current engineering challenges in materials and mechanical engineering or related fields. JMEF includes original research, review and short communication articles. JMEF welcomes original articles on all aspects of materials science/engineering and mechanical engineering, including: 1. Materials synthesis, processing and manufacturing; 2. Advanced Materials; 3. Extraction metallurgy; 4. Physics of Materials; 5. Computational studies on Materials and Mechanical Engineering; 6. Fluid Dynamics and Heat Transfer; 7. Management Integrity and Reliability Engineering; 8. Mechanical systems; and related fields.
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Articles 68 Documents
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Feasibility Study of Using Energy Extracted from The Process of Electrochemically Consumed of Al 2024 for Powering Daily Used Electric Car Marda, Yanuar Mohamad; Riastuti, Rini; Ibrahim, Muhammad Hamka
Journal of Materials Exploration and Findings Vol. 3, No. 2
Publisher : UI Scholars Hub

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Abstract

Usage of green energy for transportation has become important due to the contribution of transportation activity to climate change. Electrochemical energy has been used as a source of green energy. The objective of this work is to evaluate sufficiency of energy provided by electrochemically consumed Al 2024 for supplying energy to daily used PHEV electric car. Study of previous articles, observation of typical amount of energy required, electrochemical galvanic cell experiments, and simple calculations have been conducted to determine produced energy feasibility. Electrical energy produced by consuming 340 gr of Al 2024 in galvanic cells has the total lifetime of 10.8 hours and the mileage covered on the electric vehicle mode is 234.9 km. It can be used to cover most of the energy needed for a daily combination of sub-urban and urban city car.
Root Cause Analysis of Leakage Tube Boiler: A Study Case Sitompul, Lydia Kartika Basaria; Priadi, Dedi
Journal of Materials Exploration and Findings Vol. 3, No. 2
Publisher : UI Scholars Hub

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Abstract

Oil and gas industry can have catastrophic implications for human life, the environment, and the economy. This paper investigated failure analysis using root cause analysis especially for boiler tube leakage of Heat Exchanger. Identify the issue using microscopic examination and energy dispersive x-ray analysis were conducted on the tube inside and outside surface to determine root cause of the failure. The formation of a protective film in the aluminum-brass tube during the starting stage is very important for ensuring adequate film protection throughout the service life of the heat exchanger. During this stage, exposure to unpolluted water is essential. The dezincification corrosion suggested the disruption of the formation of the protective films by the cooling water medium on the inner tube, The entrapped leaked fluid from the inner tube at the interface between the inner tube and outer tube resulted in secondary damage due to galvanic corrosion at conducive area.
Maintenance Notes to Improve the Reliability of Wheel Flange Failure for Overhead Crane Burhanuddin, Fakhri; Yuwono, Akhmad Herman
Journal of Materials Exploration and Findings Vol. 3, No. 2
Publisher : UI Scholars Hub

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Abstract

Overhead traveling cranes in the industry have utility workload classifications and require high standards of safety and reliability by mobilizing lifting and transporting capacity variants of steel products, equipment, and other supports. The crane wheels are the main support in moving the end carriage so that the crane can work according to its function. Failures in the operation and maintenance cycle have occurred. Therefore, proper repair and maintenance methods are highly needed to restore the original design function to its working integrity. Logic tree analysis was used to breakdown all causes of failure; thus, mitigation was performed by carrying out continuous improvements rather than investigations. In this work, failure of the wheel flange in asset integrity management was found to be correlated with other related components which refer to the data of international standard for carrying out the needed repairs.
Environmental Impacts Potential of Natural Gas Production Through Life Cycle Assessment Afghani, Akmal Al; Pratama, Mochamad Adhiraga; Dahlan, Astryd Viandila
Journal of Materials Exploration and Findings Vol. 3, No. 2
Publisher : UI Scholars Hub

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Abstract

Life cycle assessment (LCA) is a methodology used to evaluate potential environmental impacts in various industry sectors, including the oil and gas industry to quantify the environmental impacts and determine the processes that have significant impacts along their production cycle. This environmental impact study adheres to ISO 14040:2016 and 14044:2017 standards, using the ReCiPe methodology within a gate-to-gate scope to analyze potential environmental impacts of 1 MMSCFD natural gas production. The impact categories analyzed in this study are Global Warming Potential (GWP), Particulate Matter Formation (PM), Ozone Formation (OF), and Terrestrial Acidification (TA). The results of this study identified several activities and processes in production cycle that can be categorized as hotspots: (1) Emissions from the Waste Heat Boiler and Thermal Oxidizer process to oxidize acid and permeate gas, (2) Emissions from the electricity generator unit, (3) Emissions from the compressor unit, and (4) Emissions from flaring activities related to safety operations. The quantified impacts of each category are GWP (3,555 kg CO2-eq), PM (0.52 kg PM2.5-eq), OF (3.36 kg NOx-eq), and TA (1.72 kg SO2-eq). This study maps the environmental impacts of natural gas production cycle, helping to identify further improvements for reducing potential environmental impacts.
Hollow Connecting Rod Thin Wall Austempered Ductile Iron (TWADI) for Manufacturing Light Weight Components Silva, Ricardina Freitas da; Suharno, Bambang; Sulamet-Ariobimo, Rianti Dewi
Journal of Materials Exploration and Findings Vol. 3, No. 2
Publisher : UI Scholars Hub

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Abstract

Efforts made by the automotive industry to reduce energy consumption have encouraged researchers to carry out various studies. One way is to make components lighter by casting thin wall austempered ductile iron (TWADI). Reducing the weight of components such as connecting rods (conrod) will result in lower energy consumption, but provided that these components still meet standards in terms of mechanical properties and microstructure or even exceed them. In this research, design optimization was applied to conrod by making the area I-beam zero mm (hollow), with hope that it can replace conrod Vespa PX-150. While the manufacturing process is divided into several stages. The focus of this research only discusses the design process stage to determine the optimal design with the help of simulation. The difference is found in the number of defects formed. The observations show that shrinkage defects in Model A and Model B are both located at rod big end. Comparison results of the shrinkage defects formed show that in Model A there are 3 shrinkage defects while in Model B there are only 2 defects. From the results obtained, it is recommended to use plates I-Beam in Model B. Based on the results of this simulation, the casting process can be done to validate the simulation results before optimization is carried out in manufacturing of hollow conrod.
Implementation of Machine Learning Using Deep Neural Networks to Estimate the Failure Risk Caused by Leakage in Pressure Relief Devices Wijayanto, Adi Yudho; Andreano, Yossi; Rizky, M. Ali Yafi; Priadi, Dedi
Journal of Materials Exploration and Findings Vol. 3, No. 2
Publisher : UI Scholars Hub

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Abstract

The primary objective of deploying Pressure Relief Device (PRD) equipment is to ensure the safety of pressure vessels within a pressurized system. Over time, PRD equipment may degrade and fail to perform its intended function, which must be identified as a failure mode. To mitigate potential risks associated with this, it is recommended that an approach such as risk-based inspection (RBI) be implemented. Despite the widespread adoption of RBI, the method relies on qualitative techniques, leading to significant variations in equipment risk assessments. This study proposes a novel risk analysis method that uses deep learning-based machine learning to develop a risk assessment model for PRD equipment related to the fail-on-leakage failure mode. This innovative approach will reduce assessment times, improve accuracy, and lower processing costs by providing precise calculation results. The research develops a risk prediction program that uses deep learning-based machine learning designed explicitly for failure-on-leakage failure mode in pressure relief equipment. The dataset used in the model development process adheres to API 581 standards and comprises 168 data points. Various model parameters are employed, including a test size of 20%, a random state value of 0, 150 epochs, a learning rate of 0.001, and 3 layers with dense values of 128, 64, and 32. The model's performance is evaluated using a validation confusion matrix, which indicates an accuracy of 94%.
Analysis Risk Based Inspection API 581 on LPG Spherical Tank at PT. XYZ Trahmawan, Sigit; Siradj, Eddy Sumarno; Fatriansyah, Jaka Fajar
Journal of Materials Exploration and Findings Vol. 3, No. 2
Publisher : UI Scholars Hub

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Abstract

Liquified petroleum gas (LPG) spherical tanks are pressure vessel equipment for storing fuel gas products. The high pressure along with the fuel gas inside as flammable and combustible substance means that this equipment might result major accident hazard such as explosion, fires and environmental pollution. This study is aimed calculated and mitigate risk on 500 metric ton capacity LPG spherical tank using Risk-based inspection (RBI) analysis method that makes risk as its foundation. This RBI method uses quantitative analysis referring to API 581 to determine the risk of LPG Spherical Tank by determining the probability of failure (PoF) and the consequences of failure (CoF). From the results of the risk assessment will be determined appropriate methods and scheduling inspection for LPG spherical tank. As result, thinning defect mechanism is one that influences the possibility of failure of LPG ball tank equipment with a failure rate of 4.13 E-06 failure/year. The result risk assessment of LPG ball tank is at the medium-high risk level with the probability of failure being in category 1 (low) and the consequence of failure being in category E (high). Meanwhile, the recommended inspection method for LPG tank is internal and external inspection in the form of visual examination and ultrasonic thickness measurement with an inspection interval every 5 (five) years.
Strategic Site Selection for Bio-LNG Plant in Indonesia: A Multi-Criteria Scoring Method Approach Oktariani, Edma Nadhif; Yuliusman, Yuliusman
Journal of Materials Exploration and Findings Vol. 3, No. 3
Publisher : UI Scholars Hub

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Abstract

In Indonesia, the energy sector is still predominantly reliant on fossil fuels, with renewable energy, including liquefied biomethane (Bio-LNG), playing a limited role. Nonetheless, Indonesia has significant potential for Bio-LNG development due to its abundant organic waste resources such as Palm Oil Mill Effluent (POME) from palm oil mills. Having approximately 891 Palm Oil Mills in Indonesia and being spread mostly in Sumatra, this study aims to select a strategic location for a Bio-LNG plant that can enhance logistical efficiency and economic viability for the plant. This study uses Multi-Criteria Decision Making (MCDM) methodologies to assess potential sites based on key criteria: Land Availability, Distance to Source of Feedstock, Distance to Customer Locations, Jetty Availability, and Future Business Developments. This study has narrowed down into focusing on provinces with substantial raw material potential, Riau Province, particularly Dumai City and its surroundings, which emerges as a pivotal hub. Secondary data are gathered to conduct a systematic scoring process evaluates and integrates each criterion to generate a comprehensive ranking of potential sites. The selected site for the Bio-LNG plant is Location 1, at the coordinates of 1.662056, 101.707092, Pelintung, Medang Kampai Subdistrict, Dumai City, Riau. Its strategic positioning, proximity to key transportation routes, availability of abundant feedstock, and access to necessary infrastructure make it an ideal choice. This study aims to advance Bio-LNG infrastructure in Indonesia, promoting cleaner energy solutions, and enhanced supply chain efficiency.
Effect of Alkyd and Polyester Resin Compositions on Corrosion Resistance, Blistering, and Adhesion in utilization of Oily Sludge as Anti-rust Coating Material Kakalang, Gerets Land; Kristianto, Yohanes David; Mudaryoto, Johny Wahyuadi
Journal of Materials Exploration and Findings Vol. 3, No. 3
Publisher : UI Scholars Hub

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Abstract

Oil sludge is a waste derived from upstream and downstream activities of the oil and gas industry which is estimated at 10,000 tonnes generated from all PERTAMINA downstream activities spread across various fields, processing units and depots throughout Indonesia. Oil sludge has the same characteristics as asphalt, where asphalt in previous studies can be used as an anti-rust coating, so that the handling of oily sludge can be topped up by reusing and having its own added value. The purpose of this research is to utilise waste oily sludge as an alternative anti-rust coating material and compare alkyd resin and polyester resin on corrosion resistance, adhesion resistance, and pinhole characteristics of anti-rust coating materials. The method used in this research is that the oily sludge added to the forming ingredients for the coating, namely: CaCO3 (Calcium Carbonate), resin (polyester and alkyd), asphalt, wax and additives with a certain composition. The effect of adding 20 g resin will improve the corrosion resistance, blistering, and adhesion. Alkyd resins produce better corrosion and blistering resistance than polyester resins, where there is a 31% decrease in rust width for alkyd resins and 9% for polyester resins. As for adhesion, good results were obtained for both resins. In the pin holes test, pin holes were found to form in both resins. While in the atmospheric exposure test in the Tanjung Priok area, sample G1 was found to have undercutting while samples G5 and G6 formed alligatoring.
Single-step Synthesis of Activated Carbon from Arabica Spent Coffee Ground using K2CO3 as Activator Agent Mieldan, Ghina Ivana; Yuliusman, Yuliusman
Journal of Materials Exploration and Findings Vol. 3, No. 3
Publisher : UI Scholars Hub

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Abstract

Activated carbon is a nanomaterial that is often used as an effective adsorbent. Activated carbon raw materials can use biomass, such as coffee grounds, which can be found along with the growth of public interest in coffee drinks. Chemical activators are used for activation to increase biomass carbon's adsorption capacity. Using K2CO3 activator to increase the specific surface area of activated carbon is more harmless than KOH. The use of spent coffee grounds as carbon source and food additive K2CO3 as an activator can make food-grade activated carbon that can be used for food. This study aimed to synthesize activated carbon in one-step synthesis by utilizing coffee grounds biomass waste by varying the mass ratio between biomass waste and K2CO3. The activated carbon was characterized using SEM- EDX and iodine numbers. Activated carbon was prepared with spent coffee ground and K2CO3 with the mass ratio of 1:1 gained the largest surface area of 1052 m2.g-1 despite having the lowest yield of 18%.

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