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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 6 Documents
 1 
Search results for , issue "Vol. 3, No. 3" : 6 Documents clear
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%.
Inspection Program Effectiveness Key Performance Indicator for Pressurized Static Equipment Integrity at Offshore Platform Haekal, Teuku Ahmad; Soedarsono, Johny Wahyuadi; Munir, Badrul; Sholihin, Muhammad Yudi Masduky
Journal of Materials Exploration and Findings Vol. 3, No. 3
Publisher : UI Scholars Hub

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Abstract

One of the key challenges in asset integrity management system at offshore platform is the lack of visibility regarding performance issues and program effectiveness. Without proper performance measurement systems, it becomes difficult to address positive or negative trends promptly and for management to stay informed about the status and the impact of the inspection program. Therefore, Key Performance Indicator (KPI) is needed to measure inspection program effectiveness to prevent undesirable equipment failures that could lead to Loss of Primary Containment (LOPC) or Process Safety Event (PSE). The developed KPI is the ratio of the number of non-leak inspection findings with a remaining life of less than 3 years to the total number of all anomalies with a remaining life of less than 3 years, including leak findings. By applying this KPI, inspection program effectiveness for an offshore field was monitored and improved firmly from 29% in 2018 to 82% in 2023, with some fluctuations in performance before achieving a strong recovery in later years.
A Comparative Study of Conventional and Statistically Active Corrosion Methods for Corrosion Growth Assessment of a 24-inch Gas Pipeline Rinaldi, Rudi; Fatriansyah, Jaka Fajar
Journal of Materials Exploration and Findings Vol. 3, No. 3
Publisher : UI Scholars Hub

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Abstract

Component failures in oil and gas pipelines can have fatal consequences, leading to operational downtimes and environmental damage. Knowledge of the corrosion growth rate is fundamental to pipeline integrity management, as it is essential for risk assessment and decisions related to asset management. This article aimed to compare two approaches for the corrosion growth estimation of the 24-inch offshore gas pipeline: the conventional method versus the Statistically Active Corrosion (SAC) method. This article is based on the in-line inspection (ILI) results of two consecutive assessments from 2020 to 2023 of the entire 73 km of the pipeline. The results show that the SAC method evaluates the corrosion activity on the pipeline with better accuracy and localization than the conventional method, highlighting 782 corrosion active joints in the 5,987 pipeline joints. The SAC method leads to much higher average and maximum corrosion growth rates while also being able to pinpoint active corrosion locations more accurately. Thus, the SAC method is an efficient and simple strategy to cope with corrosion assessment problems regarding pipeline integrity management. It enables the operators to prioritize their maintenance actions, improving pipeline safety.
Comparative Analysis of Risk-Based and Time-Based Inspection Application in Hydrocarbon and Chemical Industries: A Review Azizar, Azizar; Sofyan, Nofrijon
Journal of Materials Exploration and Findings Vol. 3, No. 3
Publisher : UI Scholars Hub

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Abstract

RBI and TBI strategies are comparatively reviewed in terms of their contribution to maintaining asset integrity for asset owners in the hydrocarbon and chemical industries. The objective is to assess various methods on a cost-efficient and risk-managed operational safety basis. It utilizes common industry standards such as API 580 for RBI, and API 510, API 570, and API 653 for TBI, and also case studies and literature analysis. The analysis of data was conducted to examine how each approach deals with inspection planning and decision-making. They suggest that RBI's risk-based prioritization strategy leads to more effective management of high-risk assets, while TBI is simpler and standardized, but could potentially result in over-inspections or overlook emerging risks. The review thus suggests a customized strategy taking account of both RBI and TBI in order to adequately meet requirements related to operational processes, risk exposure, and compliance.

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