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RISK-BASED INSPECTION OF CRUDE AND REFINED OIL STORAGE TANK IN INDONESIA REFINERY PLANT Sulistomo, Try Rahadi; Surjosatyo , Adi
International Journal of Mechanical Engineering Technologies and Applications Vol. 4 No. 1 (2023)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2023.004.01.10

A storage tank, which is used to store oil, is important and high-risk equipment that requires attention to its safety aspects. As a preventive measure, the government requires inspections of all storage tanks, either on a regular basis (every four years) or based on risk assessment. This safety study aims to create an inspection plan for the storage tanks at the oil refinery using the risk-based inspection (RBI) method. The RBI method in this study adopts API RP 581, Third Edition, 2016. Risk analysis is carried out in stages, including collecting technical data on the tanks, determining failure mechanisms, conducting risk analysis, and finally creating an inspection interval and method. Technical data was collected and studied for 29 storage tanks designed according to the API 650 standard. The determined failure mechanisms for the storage tank shell are atmospheric corrosion, general corrosion, and corrosion under insulation. The results of the risk analysis showed that all tanks have a medium risk, with 16 units in category 3C and 13 units in category 2C. The planned inspection methods are visual inspection, UT thickness or flaw thickness, and CUI, with most inspection intervals reaching 10 years. Based on this study, it is concluded that risk-based inspection (RBI) is more effective and efficient than the specific time interval inspection method (every 4 years).

Implementation of AHP and Fuzzy Topsis Methods with Techno Economic Analysis Selection of Appropriate Technology for Waste Management Case Study University of Indonesia Panji Utomo; Adi Surjosatyo
Journal Research of Social Science, Economics, and Management Vol. 4 No. 5 (2024): Journal Research of Social Science, Economics, and Management
Publisher : Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jrssem.v4i5.752

The "Zero Waste City" program is a waste management policy initiative in Depok City that has been implemented from 2016 to 2024. The primary objective of this program is to make the entire Depok City area free from all types of waste. However, the program's implementation faces challenges, leading to some areas in Depok City still struggling with waste issues. Universitas Indonesia, as a higher education institution located in Depok City, acknowledges the waste-related challenges in its surrounding environment. Therefore, the university is committed to actively participating in solving waste issues originating from its campus environment. This research aims to address waste issues at the source, particularly by applying appropriate technology based on the criteria and sub-criteria at Universitas Indonesia. This step is expected to contribute to reducing waste-related problems in Depok City and serve as an example of effective waste management from its source. Notably, Universitas Indonesia contributes to the accumulation of residual waste at TPA Cipayugn Depok, which has become increasingly concerning over time. The analysis in this study employs the Analytical Hierarchy Process (AHP) and Fuzzy Technique for Order Performance by Similarity to Ideal Solution (TOPSIS) methods to evaluate suitable waste management technologies for addressing the issues of residual waste accumulation. Additionally, techno-economic analysis is conducted to assess the feasibility of the selected technology. The project's feasibility evaluation parameters include Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PBP), and Benefit Cost Ratio (BCR).

Biochar and Energy Production from Rice Husk and Corncob in Karawang: A Techno-Enviro Analysis Siantar, Gabriella A L; Surjosatyo, Adi
Prosiding SNTTM Vol 22 No 1 (2024): SNTTM XXII Oktober 2024
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/590795

The world is facing increasing challenges in sustainable energy production and waste management. This study presents a techno-environmental analysis of biochar and energy production from rice husks and corncob in Karawang, Indonesia, through co-gasification. A parametric study using Aspen Plus simulation shows that biochar yield is sensitive to temperature and equivalence ratio (ER). Specifically, corncob gasification at 450 degrees Celsius yields the highest amount of biochar. Additionally, the study finds that increases in temperature and ER lead to higher syngas and lower heating value (LHV). A life cycle assessment was conducted to evaluate three scenarios: 100% rice husk, 100% corn cob, and a 50% combination of rice husk and corncob for biochar application as carbon sequester. The findings indicate that the 50% mixing ratio has the most positive impact on global warming potential, with a carbon offset of - 170,134 kg CO2eq per 1000 kg of biochar applied to soil. The results provide valuable insights into environmental impacts of utilizing these agricultural residues for renewable energy generation and biochar production.

Hydrogen-rich syngas production of solid waste supercritical water gasification multi-objective process optimization Saputro, Bayu Aji; Surjosatyo, Adi; Sari, Wanda Rulita; Dafiqurrohman, Hafif; Qossam, Izzuddin Al; Lestari, Puspa
International Journal of Renewable Energy Development Vol 14, No 4 (2025): July 2025
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.60848

The increasing population and changing lifestyles have led to significant solid waste accumulation, necessitating efficient waste management to prevent environmental and health issues. Supercritical water gasification (SCWG) is an effective method for converting high-moisture biomass into hydrogen-rich syngas, operating at temperatures above 374°C and pressures above 490MPa. The objective of this study was to develop and validate an integrated modeling and multi-objective optimization framework, combining Response Surface Methodology (RSM), Artificial Neural Networks (ANN), and Multi-Objective Genetic Algorithm (MOGA) to maximize hydrogen-rich syngas production from municipal solid waste through SCWG. The research models and predicts the effects of feed concentration, residence time, and reaction temperature on hydrogen yield, lower heating value (LHV), and gas yield. The integrated RSM and ANN models demonstrated high predictive accuracy with R² values exceeding 0.95. Optimization results from MOGA identified optimal parameters: a feed concentration of 2%, a reaction temperature between 490-495°C, and a residence time of 80 minutes. These conditions achieved H2 selectivity of 84.73%, an LHV of 6.95 MJ/Nm³, and a gas yield of 29.7%. The findings highlight the dominant influence of reaction temperature and residence time on hydrogen production, while feed concentration requires careful balance for optimal syngas quality. This study demonstrates that the combined use of RSM, ANN, and MOGA provides an effective framework for optimizing SCWG processes, offering practical insights for industrial-scale applications. Future research should explore additional variables such as biomass composition, pressure, and catalysts to enhance the efficiency and sustainability of hydrogen production from solid waste, supporting SCWG as a viable technology for sustainable energy production and effective waste management.

Determination of the Equivalent Ratio of Optimum Gasifier with Several Types of Biomass Sumirat, Tito; Pradana, M. Rizky; Surjosatyo, Adi
Journal of World Science Vol. 2 No. 6 (2023): Journal of World Science
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jws.v2i6.327

This study aims to create a CFD model aligned with lab test results from previous studies, conduct simulation tests using several types of biomass as input and optimize the operating parameters of various types of biomass to produce optimum syngas. The method used in this research is literature study and modelling using Ansys Fluent software. The results of this study indicate that biomass is a source of new and renewable energy (EBT) which has abundant potential in Indonesia, but its use could be more optimal. Biomass gasification is one of the most promising techniques used to convert solid fuels into useful gaseous fuels, which can be widely used in many households and industrial applications such as power generation and internal combustion engines. This research implies that it can help determine the optimum equivalence ratio and feed rate for a gasifier that utilizes various types of biomass. By finding the optimal combination, the composting process can achieve higher energy efficiency, resulting in more energy being generated from the biomass used. Additionally, by knowing the appropriate equivalence ratio and feed rate, this research can assist in optimizing the biomass composting process in the gasifier.

Systematic Analysis of Potential Marine Renewable Energy for Coastal Ecological Balance on Bawean Island: A Review Sari, Wanda Rulita; Gunawan, Gunawan; Surjosatyo, Adi; Muzhoffar, Dimas Angga Fakhri
International Journal of Marine Engineering Innovation and Research Vol 9, No 2 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i2.20298

Bawean Island displays significant natural potential with abundant natural resources and natural beauty that is attractive for tourism and industrial development. However, this potential is threatened by various environmental and socio-economic problems such as limited availability of clean water, erosion of coastal structures, accumulation of rubbish, economic challenges, and low levels of community education. To overcome these challenges, an integrated and sustainable approach is needed that involves the government, community, and other related parties in sustainable natural resource management and considers ecological, economic, and social aspects. Systematic analysis is carried out to understand the potential of coastal natural resources and the problems that threaten the ecosystem. An integrated and sustainable approach is needed, involving collaboration between government, society, and related parties. The integration of new technologies, including renewable energy technologies, was identified as a potential solution to several specific problems, such as waste management and clean water supply. An integrated and sustainable approach is analyzed by involving collaboration between government, society, and related parties. With collaboration and a deep understanding of the challenges and potential of Bawean Island, it is hoped that a sustainable coastal ecological balance can be achieved for the welfare of the environment and local communities.

TECHNO-ECONOMIC ANALYSIS OF BOILER WASTE HEAT-BASED BIOMASS DRYING SYSTEM OF A COAL COFIRING POWER PLANT Baisir, Mahpudi; Surjosatyo, Adi; Dafiqurrohman, Hafif
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1858

This research aims to find the optimal operating pattern in a rotary dryer type biomass drying system with the heating medium from exhaust gas leaving the boiler. This heating medium is believed to provide high profits because it does not require additional energy. However, the lowest moisture may not necessarily provide maximum investment profits due to trade-offs with capital and operational costs. The research results show that the test point at a biomass inlet flow of 10 t/h, a residence time of 25 minutes, and an exhaust gas flow of 90 t/h can optimally obtain the highest three investment parameters, including USD 8,518,085.33 for NPV, 150.32% for IRR, and 0.67 years for PBP. So that it succeeds in reducing the biomass moisture from 44.57% to 10.90%. Reductions in energy output and operational duration should be avoided wherever possible because they have a significant impact on reducing profit.

RISK-BASED INSPECTION OF CRUDE AND REFINED OIL STORAGE TANK IN INDONESIA REFINERY PLANT Sulistomo, Try Rahadi; Surjosatyo , Adi
International Journal of Mechanical Engineering Technologies and Applications Vol. 4 No. 1 (2023)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2023.004.01.10

A storage tank, which is used to store oil, is important and high-risk equipment that requires attention to its safety aspects. As a preventive measure, the government requires inspections of all storage tanks, either on a regular basis (every four years) or based on risk assessment. This safety study aims to create an inspection plan for the storage tanks at the oil refinery using the risk-based inspection (RBI) method. The RBI method in this study adopts API RP 581, Third Edition, 2016. Risk analysis is carried out in stages, including collecting technical data on the tanks, determining failure mechanisms, conducting risk analysis, and finally creating an inspection interval and method. Technical data was collected and studied for 29 storage tanks designed according to the API 650 standard. The determined failure mechanisms for the storage tank shell are atmospheric corrosion, general corrosion, and corrosion under insulation. The results of the risk analysis showed that all tanks have a medium risk, with 16 units in category 3C and 13 units in category 2C. The planned inspection methods are visual inspection, UT thickness or flaw thickness, and CUI, with most inspection intervals reaching 10 years. Based on this study, it is concluded that risk-based inspection (RBI) is more effective and efficient than the specific time interval inspection method (every 4 years).

Systematic Analysis of Potential Marine Renewable Energy for Coastal Ecological Balance on Bawean Island: A Review Wanda Rulita Sari; Gunawan Budiyanto; Adi Surjosatyo; Dimas Angga Fakhri Muzhoffar
International Journal of Marine Engineering Innovation and Research Vol. 9 No. 2 (2024)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i2.4995

Bawean Island displays significant natural potential with abundant natural resources and natural beauty that is attractive for tourism and industrial development. However, this potential is threatened by various environmental and socio-economic problems such as limited availability of clean water, erosion of coastal structures, accumulation of rubbish, economic challenges, and low levels of community education. To overcome these challenges, an integrated and sustainable approach is needed that involves the government, community, and other related parties in sustainable natural resource management and considers ecological, economic, and social aspects. Systematic analysis is carried out to understand the potential of coastal natural resources and the problems that threaten the ecosystem. An integrated and sustainable approach is needed, involving collaboration between government, society, and related parties. The integration of new technologies, including renewable energy technologies, was identified as a potential solution to several specific problems, such as waste management and clean water supply. An integrated and sustainable approach is analyzed by involving collaboration between government, society, and related parties. With collaboration and a deep understanding of the challenges and potential of Bawean Island, it is hoped that a sustainable coastal ecological balance can be achieved for the welfare of the environment and local communities.

Retrofitting Digestate Recirculation System to Improve Methane Yield in Anaerobic Digestion Elang Nur Reiz M N Insaani; Hafif Dafiqurrohman; Adi Surjosatyo; Cindy Rianti Priadi; Baskoro Lokahita
Journal of World Science Vol. 5 No. 6 (2026): Journal of World Science
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/jws.v5i6.1675

Digestate recirculation has gained attention as a promising strategy to enhance methane production. By reintroducing acclimatized microorganisms and residual biodegradable compounds into Anaerobic digestion (AD) system, this approach can potentially improve process stability and biogas quality. To systematically evaluate these effects, modeling and simulation offer a reliable framework for assessing methane yield. This study aims to assess the feasibility of simulating methane production from an anaerobic digestion reactor using food waste (FW) as the primary feedstock, incorporating a digestate recirculation system. It is hypothesized that recirculated digestate, due to its high organic content and catalytic properties, can effectively enhance biogas quality and optimize energy recovery from the system. A process flow diagram was developed in Aspen Plus® version, incorporating the four main biochemical stages: hydrolysis, acidogenesis, acetogenesis, and methanogenesis. The Non-Random Two-Liquid (NRTL) thermodynamic model was applied to represent polar mixture components, and a total of 46 governing equations were implemented to describe anaerobic digestion kinetics and mass balances. Model performance was validated against data reported in previous studies. Simulation results indicate that increasing the recirculation ratio up to 30% into feedstock mixture enhances both methane up to 25% higher compared to baseline and biogas production up to 32% higher than baseline. The findings demonstrate that the usage of recirculated digestate could improve the biogas quality. The developed modeling framework shows strong potential for scalability and can be applied to optimize methane production in anaerobic digestion systems with similar feedstock compositions and operating conditions.

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