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Journal of Materials Exploration and Findings
Published by Universitas Indonesia
ISSN : -     EISSN : 29625475     DOI : https://doi.org/10.7454/jmef
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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 10 Documents
 1 
Search results for , issue "Vol. 3, No. 2" : 10 Documents clear
Inspection Planning of Subsea Pipeline Using Risk-Based Inspection Adelia, Ni Luh Triska; Munir, Badrul; Soedarsono, Johny Wahyuadi
Journal of Materials Exploration and Findings Vol. 3, No. 2
Publisher : UI Scholars Hub

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Abstract

Pipelines are an important tool in oil and gas exploration. Pipeline is a transmission and liquid collection lines, including their accessories, which transport fluids from one plant to another. In transmission and collection process, there is a possibility of failure which can have minor to major impact on personnel injury, the environment and interrupt the business process. To maintain safety and to prevent accidents, the source and cause of failure needs to be calculated. Risk-based inspection (RBI) is a method that can be used to calculate the risk and determine the inspection planning both schedule and method, by combining the probability and consequences of failure. The analysis shows that the production separator is in the low-risk category. The next inspection schedule is determined based on RBI estimation which is 13 years after the last inspection. Inspection methods that can be applied to subsea pipeline based on DNVGL-RP-F116 standard are external inspection, in-line inspection with intelligent pig, and monitoring system. For external inspection can use Remotely Operated Vehicle (ROV). In-line inspection (ILI) with intelligent pig need to validate by with underwater UT B-Scan in the following year. The monitoring system only needs to be continued from what has been installed, corrosion coupon. It only needs to be adjusted for the length of installation time according to its purpose, to measure corrosion rate or detect pitting.
Effect of Impurities in Supercritical CO2 Environment on Steel Corrosion Behavior – an Overview Widianto, Shilla Rizqi; Soedarsono, Johny Wahyuadi; Riastuti, Rini; Munir, Badrul
Journal of Materials Exploration and Findings Vol. 3, No. 2
Publisher : UI Scholars Hub

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Abstract

Carbon capture, utilization, and storage (CCUS) technology is one of the available technologies to reduce presence of greenhouse gasses. Implementation of CCUS technology strongly relates with the CO2 transportation from the capturing facility to the storage in the geological reservoir. The most economical method for large-scale and long-distance CO2 transportation is using pipeline in supercritical phase. Moreover, presence of impurities such as water, O2, SO2, H2S, NO2 may cause detrimental effect towards carbon steel pipeline. This paper intends to provide an initial information for supercritical CO2 pipeline material selection, which review and summarize existing research on corrosion under supercritical CO2 environment. This paper present environment categorization in supercritical CO2 stream, impurities effect toward sample, as well as brief discussion about corrosion evaluation method.
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.
Lifetime Prediction of Pan Feeder Based on 3D Laser Scanning for Wear Assessment Maulidya, Nony; Priadi, Dedi; Asral, D. Rizal
Journal of Materials Exploration and Findings Vol. 3, No. 2
Publisher : UI Scholars Hub

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Abstract

Apron feeder is one of stages in crushing circuit to convey material in short distance. Pan flight is the main component of apron feeder that is severely exposed to wear mechanism due to its direct contact with open cut abrasive ore. With this operating environment of apron feeder, regular maintenance and inspection must be conducted to assess wear rate of pan’s surface to maintain equipment availability and provide information and sign before the equipment undergoes severe and sudden degradation. 3D laser scanning is method used in this study as Non-Destructive Testing (NDT) based inspection. The aim of using 3D scanning is to model the actual condition of pan and give measurement of wear. Later this scanning data is analyzed for forecasting life prediction of when pan surface reaches its safe minimum thickness. Utilizing 3D scanning for wear measurement offers comprehensive analysis, precise measurements with visualization capabilities and handling geometries effectively. Life prediction derived from this analysis can be used as decision making to determine next replacement date of pan feeder using regression model and linear calculation. Results after four times conducting this inspection with four months period consistently, showing that the safe replacement time will be on the earliest second trimester of 2024. This provides an advantage on the shutdown planning side to prepare resources and timetable early and effectively.

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