International Journal of Marine Engineering Innovation and Research
Migration from OJS 2 to OJS 3 Starting from Volume 10, Number 3 of 2025, the International Journal of Marine Engineering Innovation and Research (IJMEIR) has officially migrated to OJS 3, accessible at https://journal.its.ac.id/index.php/ijmeir The International Journal of Marine Engineering Innovation and Research (IJMEIR) is an open-access journal, which means that visitors around the world can publish, read, download, quote, and distribute papers published in this journal for free. The IJMEIR journal has accredited SINTA 2. The IJMEIR journal has a lot of visitors, broad impact and quite high citations. IJMEIR adopts a peer-review model, which guarantees fast publishing and convenient delivery. IJMEIR cordially invites you to contribute or recommend quality papers to us. This journal directs at the dissemination of original innovations, research and practical contributions by scientists and engineers, both from academia and industry: thesis, dissertations, research papers, and reviews related to all aspects of marine engineering. IJMEIR publishes four issues per year in March, June, September, December.
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License Articles published in IJMEIR are licensed under a Creative Commons Attribution-ShareAlike 4.0 International license (CC BY-SA 4.0). You are free to copy and redistribute the material in any medium or format, remix, transform, and build upon the material for any purpose, even commercially. However, these things are allowed to be done under terms according to the Creative Commons Attribution-ShareAlike 4.0 International License. The authors who submit the article in the International Journal of Marine Engineering Innovation and Research (IJMEIR), agree to the following terms: The authors retain the copyright of the article, without restrictions. A non-exclusive license is granted to IJMEIR to publish the article and identify itself as its original publisher, along with the commercial right to include the article in a hardcopy issue for sale to libraries and individuals. By publishing in IJMEIR, authors grant any third party the right to use their article to the extent provided by the Creative Commons Attribution-ShareAlike 4.0 International license The authors can enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book) by including the acknowledgment of its initial publication in this journal. Read more about the Creative Commons Attribution-ShareAlike 4.0 Licence here: https://creativecommons.org/licenses/by-sa/4.0/.
Wave diﬀraction and independent radiation by a buoyant body in ﬁnite-depth water by using an exact NtD boundary condition
Hydrodynamics of a ﬂoating structure is of interest from oﬀshore and coastal engineers who develop the wave energy converters and utilize the marine space resources. Recently, Rim [1-3] proposed an exact DtN (Dirichlet-to-Neumann) artiﬁcial boundary condition in order to solve three-dimensional wave-structure interactions or wave motion over piecewise topographies numerically. This paper is concerned with another artiﬁcial boundary condition or so-called NtD (Neumann-to-Dirichlet) boundary condition in order to solve water wave diﬀraction and independent radiation by a buoyant body. A virtual cylindrical surface enclosing the ﬂoating body is chosen as a boundary on which an exact NtD map is analytically derived from a solution of the exterior subregion and then it is specified as a boundary condition in order to solve the interior problem. The present model shows good accuracy through the comparison with the DtN approach and suggests the escalated results for the eﬀects of heading angle of incident wave and draft of a buoyant chamfer box.
Preliminary Design of a Catamaran Ship for Water Tourism in Lake Sunter
Lake Sunter, an man-made lake built since the 1970s and covering approximately 33 hectares, is commonly referred to as Lake Podomoro. Positioned as an urban recreational space, its scenic vistas offer potential for diverse water-based activities. In order to increase tourist engagement with the lake, it is imperative to diversify the available attractions. Among these attractions, tourist boats emerge as a viable option to capture public interest. Accordingly, this study attempts to design a catamaran tour boat equipped with motorcycle propulsion, tailored for operation on Lake Sunter. In the first stage, the primary dimensions of the catamaran vessel are determined using the linear regression method, resulting in dimensions of L = 3.2m, H = 1.15m and T = 0.4m, with a passenger capacity of 3 persons. The ship's stability is then assessed in accordance with the criteria of the IMO A.749 (18) Code On Intact Stability, Chapter 3, which applies to all ship designs. This assessment includes Load Case I and Load Case II conditions to determine the stability of the ship under different scenarios.
Revitalization of Environmentally Friendly Pinisi PELRA Fleet as a Feeder for Perintis Routes in 3TP Areas
Pelra Pinisi ships are increasingly being abandoned in freight transportation to 3TP (disadvantaged, outermost, remote, and border) regions, which are now predominantly served by perintis vessels. Unlike these perintis vessels, Pelra Pinisi ships do not receive similar government subsidies and face limitations in navigating currents and sea waves. This study proposes the revitalization of Pelra Pinisi ships through the implementation of a soft sail design to reduce emissions and fuel consumption, optimal route determination using a solver, and subsidy calculations to ensure competitiveness. The study was conducted in East Nusa Tenggara, covering six perintis routes and 24 ports. Survey data indicate that traditional Pelra vessels typically range from 30 to 40 meters in length. The proposed new designs include ships of 300 GT, 200 GT, and 100 GT, with lengths of 35.00 m, 22.75 m, and 17.50 m, respectively, and speeds of 12.5 knots, 7.8 knots, and 6.0 knots. Emission reductions were observed on the Kupang–Ndao and Kupang–Naikliu routes by 0.89%. The 300 GT vessel is optimal for the Kupang–Ndao and Labuan Bajo–Maumbawa routes, the 200 GT vessel for the Sabu–Raijua and Waikelo–Labuan Bajo routes, and the 100 GT vessel for several other routes.
Prediction of Ship Time in Port Using Machine Learning Algorithm
The shipping business at the port requires planning in managing time, starting from the ship arrival until the ship leaves the port. Having a prediction or forecast of the ship's time in Port can help the ship's sailing schedule. This research uses machine learning method which is one of the branches of artificial intelligence to predict the time of ships in port for container and general cargo ships where the machine learning algorithm is used to study a set of data and make predictions. Based on the data of arrival time and departure time of ships at Tanjung Priok Port during 2022 and 2023, using Random forrest algorithm, linear regression, KNN regression and SVM, it was obtained that linear regression had mean absolute error, mean squared error, and Root Mean Squared Error more precise than the other algorithms and their determinant coefficients close to one
Investigation of Planing Hull Resistance Calculation Using Smoothed Particle Hydrodynamics
Over the decades, advancements in computer technology have significantly contributed to the development of numerical methods, including computational fluid dynamics (CFD). CFD encompasses two primary approaches: mesh-based and mesh-free methods. While mesh-based methods are well-established and widely used for analyzing free-surface flows, such as ship resistance, mesh-free methods like smoothed particle hydrodynamics (SPH) have gained traction in real-world engineering applications. Despite its growing use, limited research has explored the application of SPH to ship resistance analysis. This study investigates the total ship resistance of a planing hull using the open-source SPH solver DualSPHysics. The research focuses on analyzing spray patterns and complex flow dynamics around the hull. DualSPHysics typically employs dynamic boundary conditions (DBC) as its standard boundary definition method. However, this study utilizes an advanced implementation of DBC, known as Modified Dynamic Boundary Conditions (mDBC), in conjunction with Project Chrono for enhanced simulation accuracy. The results demonstrate that SPH provides acceptable accuracy when compared to the Strip theory approach. Additionally, key parameters such as total force, sinkage, and trim are effectively reproduced using Project Chrono. This research highlights the potential of SPH, particularly with advanced boundary conditions, for ship resistance analysis and contributes to the growing body of knowledge in this field.
Analysis of Water Quality Correlation with the Immune Response of Litopenaeus vannamei in Probolinggo, East Java
Whiteleg shrimp (Litopenaeus vannamei) is an important fishery commodity in Indonesia, but its success is strongly influenced by water quality, which can impact the health and immune system of the shrimp. Poor water quality has the potential to induce physiological stress in vannamei shrimp and disrupt their immune system, necessitating research to optimize water quality in shrimp aquaculture. This reseacrh employed a quantitative descriptive method to analyze data obtained through simple random sampling in vannamei shrimp ponds in Probolinggo, East Java. The water quality parameters measured included temperature, pH, DO, TSS, TDS, salinity, ammonia, and nitrate, while immune parameters such as THC, DHC, and phagocytosis activity were assessed. Canonical Correspondence Analysis (CCA) was used to analyze the relationship between water quality and immune parameters. The results indicated a significant influence of water quality on the immune parameters of the shrimp, providing valuable insights for more effective pond management. The findings of this research are expected to assist shrimp farmers in improving water quality and the immune system of vannamei shrimp, thereby reducing stress and enhancing productivity in sustainable shrimp aquaculture.
Advancing Fucoxanthin Production from Microalgae: A Bibliometric Analysis of Research Trends and Innovations
Fucoxanthin has attracted significant public attention due to its extensive bioactive properties, including antioxidant, anti-inflammatory, and anti-obesity effects. This study conducts a bibliometric analysis to assess research trends, key contributors, and scientific progress in fucoxanthin studies. By utilizing data from prominent scientific databases, various bibliometric indicators, such as publication output, citation patterns, and collaborative networks, were analyzed. The analysis reveals a consistent rise in research publications over the past two decades, with significant contributions from countries like Germany, Japan, and China. Additionally, the study identifies leading institutions and influential authors who have significantly impacted the field. The results highlight the expanding interest in fucoxanthin's potential applications in pharmaceuticals, functional foods, and nutraceuticals. Furthermore, the study sheds light on collaborative efforts between academic institutions and industries that drive innovation and commercialization. This comprehensive evaluation not only provides an understanding of the current research landscape but also identifies future directions for scientific exploration and technological advancements. The findings serve as a valuable resource for researchers, policymakers, and industry stakeholders to make informed decisions and foster innovation in the utilization of fucoxanthin for human health and sustainability.
The Implementation of Nonlinear Signal Techniques for Enhanced Monitoring of Marine Propulsion Systems
The motor is a crucial component of a ship's propulsion system, playing a significant role in facilitating smooth maritime transportation operations. Various factors, including dynamic loads, speed variations, and unstable marine environmental conditions influence the performance of the propulsion motor. Under dynamic conditions, the ship's propulsion motor encounters challenges such as load fluctuations, vibrations, and other disturbances that can affect its efficiency and operational lifespan. Consequently, real-time monitoring of the motor's condition has become an urgent necessity to detect potential damage early and ensure the safety and reliability of the ship's operations. This study aims to develop a condition monitoring system for ship propulsion motors using nonlinear acoustic signals. These signals will be processed using appropriate algorithms for nonlinear signals' characteristics. The Short Time Fourier Transform (STFT) is identified as a suitable algorithm for processing nonlinear signals. The filtered signal results will provide insights into the condition of the ship's propulsion motor. Given the influence of vibrations and non-engine noise, careful consideration must be given to sensor placement to achieve high monitoring accuracy. The Completely Randomized Design (CRD) approach will be employed to determine the optimal sensor placement. Through precise signal processing, meticulous spectral analysis, and optimal sensor positioning, accurate information can be obtained. The research findings indicate that the motor monitoring system achieved an accuracy rate of 100% with the sensor positioned 110 cm from the test motor body.
Application of the finite element method for evaluating the stress due to operating load in high energy piping system
The stress value of the piping system will change during operating conditions. The stress value affects the integrity of the piping system. Excessive stress will cause deformation and damage to the piping system. The operating condition parameters of the piping system are temperature and pressure. The High-Energy Piping (HEP) system is subjected to high pressures and temperatures, which can cause significant stresses on the piping components. So stress analysis needs to be carried out to ensure that the piping system has strength and flexibility. The Cold Reheat Pipe (CRP) steam line is one of the High-Energy Piping Systems in this steam power plant. CRP consists of CRP BS 130 and CRP BS 131. This paper is about evaluating the stress due to operating loads in 2024 (temperature, pressure, and remaining thickness) for steam lines on the high-energy piping system using the finite element method and refers to ASME B31.1. The output stress values in the piping system in this paper consist of stress due to sustained load, stress due to thermal load, and hoop stress. The CRP BS 130 modeling results show the maximum stress due to sustained load (166.6 kg/cm2), the maximum stress due to the thermal load (112.8 kg/cm2), and the maximum hoop stress (855.6 kg/cm2). The CRP BS 131 modeling results show the maximum stress due to sustained load (974.2 kg/cm2), the maximum stress due to the thermal load (123.5 kg/cm2), and the maximum hoop stress (938.9 kg/cm2). The results of the stress evaluation due to the operating load were still below the allowable stress and are still permitted by the ASME B31.1 Code.
Integration of OHSMS and Marketing Strategies in Shipbuilding: Literature Review and Its Implications on Productivity
The shipbuilding industry is characterized by high-risk working environments, making the implementation of Occupational Health and Safety Management Systems (OHSMS) critically important. While OHSMS has traditionally been regarded as a tool for regulatory compliance, recent studies suggest can also function as a strategic asset that enhances a company's market positioning. This paper aims to investigate the integration of OHSMS with marketing strategies in the shipbuilding industry and evaluate their combined impact on productivity. A systematic literature review was conducted, analyzing 40 selected sources including peer-reviewed journal articles, industry reports, and regulatory frameworks. The review reveals that companies that strategically align their safety management systems with marketing communications tend to achieve multiple benefits, such as improved safety performance, stronger client trust, enhanced brand reputation, and increased productivity. These findings support the growing perspective that occupational health and safety can serve not only as an internal operational necessity but also as a competitive differentiator. The study contributes to the literature by highlighting the untapped potential of safety performance as a component of industrial marketing and suggests that cross-functional collaboration between health and safety and marketing teams can deliver both operational and reputational advantages.
Integrity Assessment of Dented Aboveground Steel Storage Tank After Hydrostatic Testing
This paper presents a comprehensive structural integrity assessment of a 50,000-kiloliter aboveground steel storage tank that experienced shell denting during hydrostatic testing. Dents and geometric imperfections are known to significantly affect the buckling behavior and load-bearing capacity of storage tanks. To evaluate the tank’s fitness for service (FFS), a Level 3 assessment was conducted following API 579-1/ASME FFS-1 Part 8 standards. Finite element analysis was employed to simulate the elastic stress distribution and fatigue behavior under various loading conditions, including hydrostatic pressure, wind, and seismic loads. Results revealed that shell course 7 and 8 experienced stress increases of up to 2282% compared to the undistorted condition, with von Mises stress remaining below the allowable limits. A fatigue analysis confirmed that stress amplitudes were below the fatigue threshold, resulting in infinite fatigue life. Furthermore, discharge simulation indicated that improper dewatering could induce external pressure exceeding the material’s yield strength, leading to localized plastic deformation. Nevertheless, the dented tank was found to be structurally sound and compliant with API 650 and API 579-1/ASME FFS-1 criteria. The study highlights the importance of proper discharge procedures and confirms that no immediate repair is required for continued safe operation of the tank.
INSPECTION OF THE ADEQUACY OF CLOSED-DRAIN AND OPEN-DRAIN SYSTEMS USING HYDRAULIC ANALYSIS FOR AGING OFFSHORE PLATFORMS
Aging offshore platforms require a reliable drainage system to ensure safety and operational efficiency. This study aims to analyze the adequacy of the closed drain and open drain systems on a 24-year-old offshore platform that is scheduled for redevelopment. The methodology employed involves hydraulic analysis, considering fluid production rates and drainage system design data based on API 14E and GPSA (2004) standards. The collected data included channel cross-section dimensions, flow rates, and fluid characteristics to calculate the system's capacity. The analysis showed that the 4-inch header pipe was adequate to accommodate a closed drain flow rate of 167.4 BPD and an open drain flow rate of 1.63 BPD. The Slop Tank (Platform X-T-26), with a geometric volume of 54 ft3, was also adequate to contain the maximum drainage volume of 15.23 ft3 from the Vertical Test Separator. This study also identified several critical points that require periodic monitoring to prevent blockages and performance degradation. This study emphasizes the importance of periodic inspections to assess the adequacy of drainage systems on aging offshore platforms to ensure safety and operational efficiency after redevelopment. It also provides preventive maintenance recommendations to extend the system's lifespan.
Analysis of Suitability and Carrying Capacity for Ecotourism Purposes in the Sepanjang Beach Tourism Area
Pantai Sepanjang menawarkan hamparan pasir yang luas dan panjang dengan sedikit karang dan bukit kapur yang telah berubah menjadi tebing. Melalui pemandangan alamnya, pengunjung menjadi tertarik untuk mengunjungi Pantai Seanjang. Tujuan dari penelitian ini adalah untuk menganalisis tingkat kesesuaian pariwisata untuk keberlanjutan. Sementara itu, penelitian terkait daya dukung kawasan dilakukan untuk mengetahui kemampuan sumber daya alam dalam mempertahankan fungsi dan kualitasnya untuk memberikan pengalaman rekreasi yang diinginkan pengunjung. Demi ketersediaan ekosistem, perlu diterapkan prinsip-prinsip ekowisata untuk memberikan batasan perilaku bagi manusia sebagai pelaku pariwisata untuk melakukan aktivitas rekreasi tanpa mengurangi kepuasan wisatawan. Teknik pengumpulan data kesesuaian pariwisata menggunakan 11 parameter: tipe pantai; lebar pantai; kedalaman air; material dasar air; kemiringan pantai; kecepatan arus; kecerahan perairan; penutupan daratan pantai; biota berbahaya; dan ketersediaan air tawar. sedangkan daya dukung kawasan dihitung dengan menghitung tingkat ekonomi masyarakat sekitar kawasan wisata; kontribusi masyarakat; aktivitas pengunjung; luas area yang dapat dimanfaatkan pengunjung; lama kunjungan; lamanya waktu kawasan wisata dibuka dalam satu hari. Hasil analisis kesesuaian wisata pada stasiun 1 adalah 2,32, stasiun 2 2,32, dan stasiun 3 2,2. Hasil menunjukkan daya tampung kawasan tersebut adalah 240 orang/hari untuk kegiatan penangkapan ikan dan 744 orang/hari untuk kegiatan rekreasi pengunjung.
Analysis Of The Influence Of F.O Purifier Maintenance On The Performance Of The Main Engine On The KM. Logistik Nusantara 2 Ship
The performance of a diesel engine is greatly influenced by fuel. Diesel engines really need clean fuel so that engine combustion is maximized. Many companies today prefer fuel oil because it is cheaper than other fuels but fuel oil is still contained by water, mud and dirt so it requires a purifier aircraft to separate the fuel from these impurities. The purpose of this study is to find out how the results of diesel engine combustion are if maintenance is carried out on the purifier periodically. This research method uses descriptive qualitative. The data source was obtained directly by means of observation and documentation as well as literature related to this research which was carried out during the sea project for 12 months at KM. NUSANTARA LOGISTICS 2
Risk Assessment for Speedboat Tourism in Raja Ampat Using the Swiss Cheese Model (SCM)
The waters of Raja Ampat in Papua are one of the world's top maritime tourism destinations, attracting over 30,000 tourists annually since 2020. However, the challenging geographical conditions, such as shallow coral reefs, strong sea currents, and busy speedboat traffic, significantly increase the risk of maritime accidents. According to the National Disaster Management Agency (BNPB), from 2012 to 2024, six incidents in the area caused serious accidents, including vessel damage and injuries. This study aims to analyze the risks of tourist speedboat accidents in Raja Ampat using three complementary risk assessment methods: the Swiss Cheese Model (SCM), interviews, and questionnaires. The Swiss Cheese Model identifies gaps in several layers, such as Environment and Weather, Vessel and Safety Equipment, Skills and Competence of Operators, and Tourism Safety Management and Regulations. The analysis shows that the skills and competence of boat operators are significant weaknesses in accident cases, and it recommends that boat operators in Raja Ampat participate in SCRB (Survival Craft and Rescue Boat) training and certification programs
Design of Internet of Thing (IoT)-based Control and Monitoring System of Eco-Aquaculture
Aquaculture plays a vital role in global food supply, contributing nearly 43% of the food consumed by humans. The rapid growth in aquaculture production demands a significant amount of electricity, which accounts for approximately 40% of the total energy costs. The primary energy sources in aquaculture used fossil fuels, it can be reduced by utilizing alternative energy sources. This research aims to develop a prototype of a floating net cage using an Internet of Things (IoT)-based water quality monitoring system powered by solar energy. The water quality parameters monitored in this study include temperature, pH, salinity, and dissolved oxygen levels. The sensors used for monitoring these parameters have undergone testing. The results indicate that the sensors can perform accurate measurements with over 90% accuracy. The solar panels installed in the system are capable of generating sufficient power to meet the operational demands, allowing the system to operate for approximately two days without sunlight. By maintaining well-controlled aquatic environmental conditions through IoT-based monitoring and control systems supported by renewable photovoltaic solar energy, environmentally friendly aquaculture operations can be conducted efficiently and productively. Ultimately, this leads to the production of high-quality aquaculture products, cost-effective operations, and the utilisation of eco-friendly energy sources.
Adaptive management for coastal sanitation governance in Jakarta, Indonesia: Bridging community resilience and the 100-0-100 development
Coastal urban areas in Indonesia, particularly in Jakarta, face complex sanitation challenges due to rapid urbanization, environmental vulnerability, and the persistence of informal settlements. While national programs like the 100-0-100 initiative and the KOTAKU (Kota Tanpa Kumuh) program aim to achieve universal sanitation access and slum eradication, implementation in flood-prone coastal zones remains constrained by rigid infrastructure models, fragmented governance, and limited community engagement. This study employs a narrative review approach to examine how principles of adaptive management can enhance the effectiveness, inclusiveness, and resilience of coastal sanitation systems. Drawing on literature from urban planning, environmental governance, and participatory development, the study synthesizes insights across five core dimensions of adaptive management: assets, flexibility, organization, learning, and agency. The resulting framework highlights the importance of leveraging local knowledge, enabling flexible planning and financing, promoting inter-agency collaboration, institutionalizing learning mechanisms, and strengthening community leadership. By aligning technical solutions with social realities and environmental dynamics, adaptive management offers a pathway to improve sanitation governance while supporting Indonesia’s broader sustainable development and climate adaptation goals. The study concludes with policy recommendations to integrate adaptive approaches into the design and evaluation of urban sanitation programs, ensuring that no community is left behind in the pursuit of inclusive and resilient urban futures.
An Experimental Study of Stagger Angle Effect Placed in front of Returning Side toward the Savonius Wind Performance Using Overlap Myring Blade for n = 1
The previous Savonius wind turbine studies have proved that overlap modifications to conventional blades can improve turbine performance. With these conventional blades, the performance is less optimum because the drag force generated by turbine's rotation is still high. Based on this condition, this experiment is conducted by modifying Savonius wind turbine with overlap blades using Myring equation n = 1. Its blade profile is made half-elliptical to reduce drag force. Diameter and height of the turbine are 400 mm with 0.3 overlap ratio. The ratio of cylinder diameter (ds/D) is 0.4, and the ratio of cylinder center distance (S/d) is 1.7. Experiments are conducted by varying stagger angles of circular cylinder in front of returning blade are 45°, 50°, 55°, and 60° with velocity 5 m/s. The final results show that the best performance improvement of the turbine occurs at 60° stagger angle. The increase in torque coefficient is 4.95% and power coefficient is 20.16% to overlap Savonius wind turbine with myring n = 1 with no circular cylinder.
Assessment of Safe Loading Conditions for the SPCB Deck Crane Using Hydrostatic and GZ Curve Analysis
This study comprehensively assesses safe loading conditions for the Self-Propelled Crane Barge (SPCB) Deck Crane by integrating detailed hydrostatic calculations with righting-arm (GZ) curve analysis. At the designated summer draft of 2.75 m, baseline parameters—displacement (1 716 t), centre of buoyancy (KB = 0.765 m), transverse metacentre (KM = 2.780 m), and metacentric height (GM = 1.23 m)—were established from the vessel’s stability booklet. Four loading scenarios (lightship, full ballast, crane at maximum outreach, and cargo distribution) were defined, with updated displacement and vertical centre of gravity (KG) values used to recompute hydrostatic parameters (BM, KM, free-surface corrections) and generate full GZ curves. Intact-stability criteria (GM ≥ 0.15 m, area under GZ curve ≥ 0.08 m·rad, angle of vanishing stability ≥ 25°, and GZmax ≥ 0.25 m) were evaluated for each case. Results indicate that the ballast condition yields the highest stiffness (GM ≈ 1.50 m) and energy absorption (AUC ≈ 1.15 m·rad). The crane-outreach scenario represents the narrowest margin (GM ≈ 0.90 m, AUC ≈ 0.60 m·rad). A safe-loading envelope was developed, showing permissible crane loads of up to 100 t at 10 m outreach and limiting lifts beyond 20 m to 50 t or less. Mitigation measures—ballast management, outreach/load restrictions, optimized cargo stowage, and real-time monitoring—are recommended to ensure regulatory compliance and operational safety.
Simulation of Solar Energy Harvesting on a 25-Meter Electric Passenger Ferry
This study investigates the integration of a solar photovoltaic system on the passenger ferry E.V. Calestia operating along Manila’s Pasig River. The ferry, equipped with dual 400 kW electric motors and a battery bank of 1848 kWh, is supplemented by 20 solar panels installed on its top deck. Using a Simulink-based simulation model, the research estimates the power output and cumulative energy generation based on panel specifications, solar irradiance, and system efficiency. Results show a maximum instantaneous power output of approximately 3 kW during peak sunlight and a total weekly energy generation of around 150 kWh. These findings demonstrate the potential of solar power to enhance the ferry’s energy sustainability by reducing reliance on conventional charging and lowering emissions, thus promoting greener maritime transport solutions in urban river environments.
Analysis of Causes of Starting Failure on Auxiliary Engine MT Green Stars with HAZOP Method
Air motor starter is a component that functions to rotate the engine auxiliary flywheel to move the piston for the first combustion to occur. In this system, high-pressure air from a compressor or air tank is used to drive a starter motor that is directly connected to the engine crankshaft. As the starter motor operates, pressurized air is channeled into the starter motor cylinders, creating a rotational movement on the shaft that eventually rotates the auxiliary engine crankshaft. Air motor starters on MT Green Stars are essential for the auxiliary engine starting system on board MT Green Stars. This study aims to analyze the factors that cause the failure of auxiliary engine start failure caused by the rupture of the starter motor water bearing and the impact on the auxiliary engine. This research uses a descriptive analysis method using HAZOP data analysis techniques and data collection from observations, logbooks, journals, manual books, and interviews The research was conducted on the MT Green Stars ship which has three auxiliary engines and is experiencing problems with the starting system. Based on the research, failure factors in auxiliary engines are caused by several factors, namely starter motor water, injectors, starter motor water, and fuel filters. The impact of auxiliary engine start failure causes failure of the electrical system, system, pump, hydraulic and pneumatic system disorders, work efficiency disorders, risk of damage to the main engine, and safety and regulatory disorders. To handle it, maintenance needs to be carried out, both preventive maintenance and breakdown maintenance. The suggestions that researchers make are to routinely carry out maintenance according to PMS (Planned Maintenance System), carry out toolbox meetings, check especially auxiliary engines
Optimization of the Standalone Hybrid Energy Storage System in The All-Electric Seabus Power System Based on Pulsed Propulsion Load Prediction
In marine applications, the energy storage system (ESS) functions as the primary energy supply for fully electric propulsion vessels. During variable operation conditions involving pulsed propulsion load, the ESS employing monotype topologies are often oversized and can damage the cells. This study proposes a hybrid energy storage system (HESS) for an all-electric Seabus with a 10-year operational lifespan, with the objective of optimizing the storage system size to ensure longer operation than 72 minutes at a speed of 30 knots under variable conditions. The impact of the HESS system on installation cost and weight was thoroughly investigated. Some HESS configurations are presented, utilizing Lithium Iron Phosphate (LFP) as the high-energy (HE) cell and supercapacitors, Lithium Ion Capacitor (LIC), and Lithium Titanium Oxide (LTO) as three alternatives of the high-power (HP) cell. The HESS design predates a parallel full-active configuration with a rule-based energy management method that utilizes cut-off power between HE and HP cells. In this specific case, the LFP-LTO configuration is the optimal HESS design rather than the LFP-SC and LFP-LIC configurations, meeting all established optimization criteria and weight limitations. The study demonstrates that the HESS configuration can achieve 120 minutes of operation, which is 67% longer than the operation time of previous Seabus operations.
Numerical Evaluation of Post-Deck-Flooding IMO Criteria for a Low-Freeboard Harbor Tugboat
Abstract¾ Low-freeboard harbour tugboats often work in quartering seas where a single boarding wave can leave water sloshing on deck and erode their transverse stability. This paper evaluates how much of that erosion a 28 m tug can tolerate before it breaks the intact-stability limits of IMO MSC 267(85). Using only the vessel’s trim-and-stability booklet, the study superimposes thin sheets of retained water—0 to 0.35 m deep, with drainage coefficients κ = 0.50–0.90—on three loading states: fully laden, half-load and lightship. For every depth and κ pair the corrected righting-arm curve, metacentric height and righting-area reserves are recomputed; a limiting-KG curve and a κ–depth PASS/FAIL heat-map are then produced, and wave data from BMKG (2020–2024) are used to estimate the yearly probability of exceeding the IMO limits. Calculations show that in the full-departure condition the first IMO criterion fails when only 0.12 m of water is trapped at κ = 0.70, whereas the threshold rises to 0.24 m at half-load and 0.31 m in lightship. Lowering κ to 0.55—achievable by higher bulwarks or larger freeing ports—moves the failure boundary rightward by nearly 50 % and cuts the annual exceedance probability below 10⁻³.
Overflow Analysis on the FO Purifier of KM Tanto Sukses Vessel
This research aims to analyze the factors that cause overflow in the fuel oil purifier system and to identify measures that can be taken to address this issue using the Failure Mode and Effect Analysis (FMEA) method. Overflow in the fuel oil purifier can disrupt the fuel purification process, which is crucial for engine performance. Therefore, understanding the causes and appropriate solutions is essential. The analysis results indicate that the factors causing overflow include leakage or wear of vital components such as O-rings, gravity discs, belts, bowls, main seal rings, ball bearings, nozzles, and pilot valves, as well as improper installation of components or blockages due to debris obstructing the flow. Overflow can be managed through regular inspections of components prone to wear or damage, routine cleaning of components that are susceptible to clogging, and continuous monitoring and calibration of the system to ensure the purifier operates optimally. By implementing these measures, the fuel oil purifier system is expected to function efficiently, reduce the risk of overflow, and enhance the reliability of the fuel purification process.
Stress Analysis on Emergency Pipeline from Flare to Pressure Vessel
This work focuses on the analysis of emergency piping systems connected to flares and pressure vessels at oil and gas facilities in West Papua. The main objective is to determine support placement, and analyze pipe stress on flares and pressure vessels. The methods used include calculating the maximum allowable pipe span, stress analysis based on ASME B31.3. The results of the research show that a 6 in emergency pipe line requires a minimum of 2 supports with a maximum allowable pipe span of 36.967 ft. The pipe flexibility value of 0.00146 is still below the limit of 0.02582 set by ASME B31.3. Stress analysis due to sustained, occasional, and thermal expansion loading shows the highest values respectively of 2572.5 lb/in² (12.6% of the permit limit), 1294.0 lb/in² (18.9% of the permit limit for seismic loads), 595.0 lb/in² (2.2% of the permit limit for wind loads), and 23921.3 lb/in² (49.3% of the permit limit).
Hospital Auxiliary Vessel Fore Part Zone Planning to Improve Productivity with Precedence Diagram Method
The rapid development of Construction Management in Indonesia demands an efficient scheduling system to overcome project complexity. This study focuses on the process of building a hospital ship at one of the large shipyards in East Java, especially in the Fore Part Zone which has a high level of complexity and a limited number of blocks. Delays in this project are caused by several technical constraints such as machine breakdowns and drawing delays. This research aims to improve productivity by using the Precedence Diagram Method (PDM), which enables more optimal work scheduling by overcoming overlapping activities. Three scheduling scenarios were compared: Existing, Plan A, and Plan B. Plan A involved crashing techniques with the addition of overtime hours to accelerate critical Assembly activities (A13 and A14), resulting in a project duration of 301 days and productivity of 74.80 JO/day. Plan B integrated the drawing availability milestone as a prerequisite for the start of fabrication, and applied the same crashing as Plan A. As a result, Plan B was able to complete the project in 284 days with the same productivity, but with a more realistic and adaptive scheduling approach to field conditions. Based on critical path analysis and time efficiency, Plan B is the most optimal schedule for the construction of Fore Part Zone. This research is expected to be a reference in planning and controlling complex ship construction projects.
Population Shift of The Family Scaridae: An Ecological Study in The Threatened Habitat of Tikus Island
Parrotfish have an essential role in maintaining the balance and health of coastal and marine ecosystems, but the existence of coral reefs on Pulau Tikus as their habitat has been degraded, threatening the survival of these fish. This study aims to determine the abundance of fish in the Scaridae family based on coral reef cover and the relationship with coral reef cover. Sampling was conducted in February-May 2021 in the waters of Pulau Tikus Bengkulu. Reef fish observations used UVC (Underwater Visual Census), while coral reef cover used the LIT (Line Intercept Transect) method. The highest reef fish abundance was at station 1 at 0.06 ind/m2, while the lowest was at station 3 at 0.02 ind/m2. The highest percentage of coral cover was at station 1 at 70.44% and the weakest at station 3 at 8.18%. The relationship between the percentage of coral cover and parrotfish abundance strongly correlates with a value of R = 0.62.
ANALYSIS OF MICROPLASTIC CONTAMINATION IN VANAME SHRIMP (Litopenaeus vannamei) WITH DIFFERENT CULTIVATION METHODS
Vaname shrimp cultivation is inseparable from the use of plastic. Plastic will fragment into microplastics and pollute the environment. Water sources and cultivation methods are often the source of microplastics entering the cultivation environment. This study aims to determine microplastic pollution in three different cultivation methods, seen from the presence of microplastics in water, sediment, commercial feed, and whiteleg shrimp. Sampling was carried out for three months of December 2024 - February 2025 by testing microplastics in water, sediment, feed, gill organs, and the digestive tract of whiteleg shrimp during one cultivation cycle. The microplastics found amounted to 1,593 particles, 877 particles in water, 561 particles in sediment, 53 particles in feed, and 102 particles in shrimp samples. The microplastics found were in the form of films, fragments, fibers, and pellets with sizes between 10-600 μm. The average abundance of microplastics in water and sediment fluctuates depending on geographical and weather conditions. Microplastics in feed indicate the presence of microplastic sources from the monthly feeding process. Meanwhile, the abundance of microplastics in shrimp accumulates every month. The differences in microplastic abundance in the three methods indicate the presence of microplastic pollution originating from cultivation equipment, commercial feed, and water sources that have been contaminated with microplastics.
Fatigue Life Analysis Of Car Deck Construction on a Ferry Ro Ro
Fatigue life analysis is often overlooked in ship development, leading to an uncertain understanding of a ship’s construction lifespan. This study focuses on the fatigue life of the car deck, which is affected by deformation on a ro-ro ferry. The research aims to determine the maximum stress, location, the cause of deformation, and the fatigue life of the car deck on a ro-ro passenger ship. The calculations assess the car deck’s lifespan and provide a reference for future design considerations. Finite element analysis (FEA) is used, with fatigue life calculated using the Sonderberg method. The research begins with calculating the ship’s weight and buoyancy distribution, then determining the ship’s longitudinal strength from the load distribution. The analysis reveals that the highest stress occurs under hogging wave conditions, exceeding the yield strength of 321 MPa. Specifically, at overload and hogging wave conditions, the highest stress of 486.1 MPa is found on the starboard side between longitudinal stiffeners 1 and 2 (900 mm from the centerline), between frames 56 and 57, with a fatigue life of 4.3 years.
Light-Emitting Diode for Mitigating Horseshoe Crab (Limulidae) Bycatch of Bottom Gillnet Fishery for Blue Swimming Crab in the Waters of Ambulu Village, Cirebon Regency
Mimi, a term for horseshoe crabs (Limulidae), often constitutes an unintended bycatch in blue swimming crab (BSC) fisheries employing bottom gillnet fishing gear. Three horseshoe species found in Indonesia have been designated as ETP species. This research aims to test the efficacy of red LED Cree lights in BSC bottom gillnet fisheries to reduce horseshoe crabs bycatch. The experimental fishing approach was employed in the waters of Ambulu Village, Cirebon Regency, with 17 trips as replication. Two sets of gillnets, as control and treatment (equipped with LED lights), respectively, were utilized in the study. Data collected were the number of species and individuals of targeted species (BSC) and horseshoe crab as bycatch resulting from the BSC gillnet operations in both control and treatment nets. A descriptive analysis was used for catch composition. Statistical analyses, including paired sample t-tests and Wilcoxon tests, were conducted on the horseshoe crab bycatch and BSC catch data to test differences between the control and treatment nets. The most abundant catch consisted of crab (Actaeodes tomentosus), with 82 individuals captured in the treatment nets and 87 in the control nets. Blue swimming crab (Portunus pelagicus) caught 76 and 53 individuals in the treatment and control nets, respectively. The bycatch of horseshoe crabs (Limulidae) in the treatment and control nets of 10 and 27 individuals, respectively. The analysis revealed that the BSC catch in the treatment nets did not significantly differ from that in the control nets. Conversely, a significant difference was observed in the horseshoe bycatch between the treatment and control nets. Incorporating red LED Cree lights resulted in a 35.79% increase in the BSC catch and a 62.96% reduction in the horseshoe bycatch.
The Effect of Manhole Form on Double Bottom Ship Construction
The ship's hull construction must withstand all loads, be made as light as possible and comply with regulations. The purpose of this study was to determine the maximum strength limit of double bottom ship construction with manhole form variations. Research design for this study; literature studies, field studies, and simulations using ANSYS. The results of the existing double model structure strength values for the maximum stress values in the sagging hogging state are 236.60 MPa and 154.18 MPa. Von Mises stress values are 227.94 MPa and 136.26 MPa. The shear stress values are 131.5 MPa and 77.36 MPa. The maximum deformation is 0.0049 m, and the safety factor is 1.346. The total construction weight is 201.83 metric tons. The best results of the analysis of variation were found in Model B1, which changed the hole ratio from 0.75 to 0.6 and increased the hole dimension by 200 mm. The maximum stress values of Model B1 in the sagging-hogging condition are 186.93 MPa and 141.54 MPa. Von Mises stress values are 238.72 MPa and 184.82 MPa. The shear stress values are 113.37 MPa and 137.42 MPa. The safety factor is 1.337 m, and the maximum deformation is 0.0034 m
Optimization of Hybrid Battery-Supercapacitor Storage System in Electric Ship Using Multi-Objective Genetic Algorithm
As the marine industry now is running toward the green and more efficient propulsion system, the optimization has also become a primary part of the research. This research study is focusing on the optimal sizing of Hybrid Energy Storage (HESS) in electric ship using Multi-Objective Genetic Algorithm (MOGA). By integrating the battery and supercapacitor (SC), it helps cover the load demand while enhancing a good performance to the ship. This research study is to optimize sizing of HESS with a suitable Energy management System (EMS) to desired the intention of minimize the total cost of HESS and degradation of the battery. The proposed model addresses the complexity of HESS while optimized the distribution of power for both the battery and SC, handling the load condition.
Optimal Sizing of Hybrid Battery - Supercapacitor - Generator System in Electric Ship using Genetic Algorithm
The fossil fuel emissions from the ship have significant impacts on climate change, environmental quality, and human health. The marine sector has consequently grown increasingly interested in implementing greener and more sustainable energy solutions. The electric propulsion ship is powered by hybrid energy storage has the ability to lower emissions, improve the power quality, and lower fuel consumption. There are many types of energy storage system such as battery, supercapacitor, hydrogen, etc. In this study, the combine of battery and supercapacitor are chosen as a hybrid energy storage system to supply power to the electric ship and diesel generator is an additional power source. The main objective is to sizing the hybrid energy storage system to minimize the total cost while maintaining reliable energy supply. The optimal sizing of each component is conducted in MATLAB using Genetic Algorithm.
Load Cell Failure Risk in Tandem Mobile Crane Lifting: A Fuzzy Fault Tree Analysis Approach
Load cell is an critical component in the tandem lifting system using a mobile crane that functions to measure the load accurately. Damage to the load cell can cause operational failure and increase the risk of accidents. This study aims to analyze the potential for load cell damage using the Fuzzy Fault Tree Analysis (FFTA) approach. FFTA combines fault tree logic with fuzzy theory to clarify risk assessment. By collecting data from study literature, interviews and historical equipment data, the analysis results obtained that the factors causing load cell damage include overload factors, damage factors to load cell components and environmental factors. And through the FFTA method, namely the damage factor to the load cell component with a weighting value of 0.1840 or 47%. The contribution of this study is to provide a systematic approach to identifying and evaluating the risk of load cell damage, which can be used as a basis for improving inspection programs and preventive maintenance on tandem lifting using a mobile crane. This approach can also support management decision making in improving the reliability and safety of lifting equipment.
Load Variation Analysis Of Generator On Lembar-Padang Bai Ro-Ro Ships For Safety Maritime
A generator is vital for ship operations, serving as a source of electrical power generation on board. The electrical system changing loads every second. Even with these changes, the power demand stays steady and must be supplied correctly. Voltage stability shows how well the system can keep the voltage steady during normal operation or after something goes wrong. Things like added loads or changes in the system setup can also affect this stability. The method used in this research is circuit modeling that conducted using the Electrical Transient Analysis Program (ETAP) software to collect data. This modeling is essential for designing a system that can be effectively simulated. The result is the voltage and frequency stability values while the air compressor motor operates at 4.5kW showed no significant voltage changes. In contrast, when the electric bow thruster motor, operating at 335kW, runs, the voltage dropped to 85% within 6.5 seconds. During a short circuit at the 15th second compartment bus, the engine room bus experiences a voltage dropped of 77%, while the hull compartment bus dropped by 45%. This showed that the system is unsafe for the equipment, as the as a voltage.
International Journal Of Marine Engineering Innovation and Research