Indonesian Journal of Maritime Technology or abbreviated (ISMATECH)
Focus and Scope Research titles encompassed by this journal include, but are not limited to: Naval Architecture: covering ship strength, Ship Hydrodynamics, Ship Construction, Ship Production Management, Wooden and FRP Ship Materials, Ship Design Innovation, Ship Vibration and Noise, Welding Technology, Fatigue, Sea Transportation, Computational Fluid Dynamic Modeling. Marine Engineering: encompassing Engine Performance, Renewable Fuels, Dual fuel system, Ship electricity, Ship Resistance, Ship piping systems, Ship reliability). Ocean engineering: Marine and Offshore Structures, Coastal Structures and Management, Port Structures and Management, Subsea Umbilicals, Risers and Flowlines (SURF), Ocean Renewable Energy, Marine Instrumentation, Marine Pollution. Mechanical engineering: addressing Tribology, Energy Studies, Engines and Turbines, Heat Transfer, Fluid Mechanics, Lubrication and Wear, Materials Science, Mechatronics, Refrigeration and air conditioning, Pressure analysis, Structural and mechanical design, Renewable energy, Structural mechanics, Thermodynamics, Materials processing, Vibration).
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<![CDATA[Comparison of Motion Response Characteristics of Tension Leg Platform Structure Threestar and Fourstar ]]>
<![CDATA[Syarief, Rafi Irsyad]]>;
<![CDATA[Adnyani, Luh Putri]]>;
<![CDATA[Putri, Destyariani Liana]]>
<![CDATA[ Indonesian Journal of Maritime Technology Vol. 3 No. 2 (2025): Volume 3 Issue 2, December 2025 ]]>
Publisher : <![CDATA[Naval Architecture Department, Kalimantan Institut of Technology ]]>
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DOI: 10.35718/ismatech.v3i2.8481434
<![CDATA[Tension Leg Platform (TLP) is a floating structure used for deep-sea oil and gas exploration with a tendon mooring system that maintains its stability. This study aims to compare the dynamic response of two TLP configurations, namely Threestar and Fourstar, during free-floating. Modeling is conducted numerically using ANSYS SpaceClaim and hydrodynamic simulation through ANSYS AQWA. The structural dimensions are modified from TLP A West Seno using displacement as validation. Environmental loading is based on wave, wind, and current data from the Makassar Strait waters. The simulation results show that the Threestar configuration has a higher Response Amplitude Operator (RAO) value in translational and rotational movements than Fourstar, except for heave movements where Fourstar is slightly more dominant. The difference in RAO values reflects the effect of the number and configuration of pontoons on structural stability. Fourstar, which is more symmetrical to the X and Y axes, shows a more stable response. In addition, TLP structures tend to show better performance in longer wave periods. Thus, the Fourstar structure is more recommended as it provides higher stability in challenging sea conditions.]]>
<![CDATA[Enhancing Ship Seaworthiness Supervision: A Study at KSOP Class II Kendari ]]>
<![CDATA[Rachmianty, Andi]]>;
<![CDATA[Yusri, Muhammad]]>;
<![CDATA[Ningrat, Andi]]>;
<![CDATA[Arifuddin, Andi Mursid Nugraha]]>;
<![CDATA[Usman, Arif Fudddin]]>;
<![CDATA[Rusnaedi]]>
<![CDATA[ Indonesian Journal of Maritime Technology Vol. 3 No. 2 (2025): Volume 3 Issue 2, December 2025 ]]>
Publisher : <![CDATA[Naval Architecture Department, Kalimantan Institut of Technology ]]>
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DOI: 10.35718/ismatech.v3i2.8481363
<![CDATA[Ship accidents often occur due to ships being unseaworthy to sail. The harbor master plays an important role in supervising the seaworthiness of ships and port activities. However, ship accidents still often occur due to the unseaworthiness of ships to sail. This study examines the level of performance of the harbor master at KSOP Class II Kendari. The method used is the Costumer Satisfaction Index (CSI). The questionnaire was given to the sample which was calculated using the Slovin calculation. The results of the questionnaire have gone through validity and reliability tests and show that the results obtained are valid and reliable. The percentage value of CSI obtained reached 84.95%. This figure indicates that customers are very satisfied with the performance of KSOP Class II Kendari. This shows that KSOP Class II Kendari has succeeded in meeting customer expectations and needs well.]]>
<![CDATA[Strength Analysis of Deck A KM. Dharma Kencana V Due to The Addition of Construction With The Finite Element Method ]]>
<![CDATA[Rizki, Muhammad Khoirur]]>;
<![CDATA[Arianto, Pratama Yuli]]>;
<![CDATA[Sumarji, Sumarji]]>;
<![CDATA[Rudianto, Rudianto]]>
<![CDATA[ Indonesian Journal of Maritime Technology Vol. 3 No. 2 (2025): Volume 3 Issue 2, December 2025 ]]>
Publisher : <![CDATA[Naval Architecture Department, Kalimantan Institut of Technology ]]>
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DOI: 10.35718/ismatech.v3i2.8481374
<![CDATA[The Dharma Kencana V passenger ship is a type of crossing ship owned by a Japanese shipping company which was later acquired by an Indonesia shipping company whose planned shipping route crosses from Surabaya to Makassar. With the transfer of the ship’s shipping route, repairs and the addition of new construction in the deck A area were carried out so that the addition of the new construction increased the load the ship received. This study aims to determine the allowable stress allowed by the Indonesian Classification Bureau (BKI) Rules for Hull 2022 [1] from the stress results due to new construction on the deck. The analysis was carried out using the finite element method with numerical modeling using Ansys Static Structure student version software with a division of elements (meshing) size 200 mm on deck A frame 13 to 85. Based on the results of the element division of deck KM. Dharma Kencana V into 44767 elements at nodes 45384 and the maximum stress at 77.41 MPa. The allowable stress limit based on the BKI standard does not exceed 230 MPa, [1] so a safety factor of 2.97 is obtained so it can be concluded that the strength of the construction of deck A KM. Dharma Kencana V is still a safe category.]]>
<![CDATA[Fatigue Life Analysis of Subsea Pipelines due to Vortex Induced Vibration (Viv) at Free Span Case: Wnts (West Natuna Transportation System) ]]>
<![CDATA[Siregar, Hifzul Anwar]]>;
<![CDATA[Adnyani, Luh Putri]]>;
<![CDATA[Nurcholik, Samsu Dlukha]]>;
<![CDATA[putri, Destyariani Liana]]>
<![CDATA[ Indonesian Journal of Maritime Technology Vol. 3 No. 2 (2025): Volume 3 Issue 2, December 2025 ]]>
Publisher : <![CDATA[Naval Architecture Department, Kalimantan Institut of Technology ]]>
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DOI: 10.35718/ismatech.v3i2.8481529
<![CDATA[Subsea pipelines in free-span conditions are highly susceptible to Vortex-Induced Vibration (VIV), which generates cyclic stresses and accelerates fatigue failure. This study investigates the fatigue life of a West Natuna Transportation System (WNTS) subsea pipeline under varying heading flow angles (30°, 45°, and 90°) using ANSYS CFD simulations and the Palmgren-Miner fatigue model, in accordance with DNV-RP-F105. Simulations considered Reynolds numbers of 100, 500, and 3.91×10⁵ to capture laminar-to-turbulent flow regimes. Results show that the 90° heading flow produces the most severe VIV, with maximum bending stresses up to 5.59×10⁸ Pa and a corresponding minimum fatigue life of less than 10⁵ cycles, while 30° heading yields significantly longer lifespans, exceeding 10¹⁶ cycles in some cases. Average fatigue life decreased by up to 99.99% when flow incidence increased from 30° to 90° under turbulent conditions. The findings highlight that pipeline orientation relative to prevailing currents strongly influences vortex dynamics, and that aligning pipelines at oblique angles (30°–45°) can substantially reduce fatigue damage risk. These insights can inform the design and operational strategies of subsea pipeline systems in regions with strong and variable currents, such as the Natuna Sea.]]>
<![CDATA[A Hull Form Design Analysis with Variations of Block Coefficient (Cb) and Cross-Sectional Area (CSA) ]]>
<![CDATA[Nugroho, Hendy Pambudi]]>;
<![CDATA[Syahputri, Viony Fako]]>;
<![CDATA[Anam , Khoirul]]>;
<![CDATA[Fadhilah , Mahesa Arma]]>
<![CDATA[ Indonesian Journal of Maritime Technology Vol. 3 No. 2 (2025): Volume 3 Issue 2, December 2025 ]]>
Publisher : <![CDATA[Naval Architecture Department, Kalimantan Institut of Technology ]]>
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DOI: 10.35718/ismatech.v3i2.8481800
<![CDATA[This study investigates the influence of hull-form variations on the hydrodynamic performance of a two-passenger leisure boat designed for reservoir operation. Five hull models were developed with deadrise angles of 13°, 15°, 17°, 19°, and 21° to examine how changes in the block coefficient (Cb) and cross-sectional area (CSA) affect total resistance and maneuvering characteristics. Numerical calculations and Computational Fluid Dynamics (CFD) simulations were performed for validation. The 13° deadrise model, which had the highest Cb, exhibited the lowest total resistance of 0.92 kN, while MATLAB-based maneuvering analysis showed the largest turning radius of 9.32 m. Conversely, the 21° deadrise model achieved the smallest turning radius of 5.91 m. At a Froude number (Fn) of 1.37, the boat operates in the planing regime, where a fuller hull enhances hydrodynamic lift and reduces wetted surface area, resulting in lower drag but reduced maneuverability. The results offer practical insights for designing efficient leisure boats optimized for calm-water environments such as reservoirs.]]>
<![CDATA[Enhancing From Healthy Eating to Green Energy: A Dual Approach to Student Education on Nutrition and Biodiesel (Renewable Energy) ]]>
<![CDATA[Suardi, Suardi]]>;
<![CDATA[Pawara, Muhammad Uswah]]>;
<![CDATA[Alamsyah, Alamsyah]]>;
<![CDATA[Nurcholik, Samsu Dlukha]]>;
<![CDATA[Wulandari, Amalia Ika]]>;
<![CDATA[Anggela, Anggela]]>
<![CDATA[ Indonesian Journal of Maritime Technology Vol. 3 No. 2 (2025): Volume 3 Issue 2, December 2025 ]]>
Publisher : <![CDATA[Naval Architecture Department, Kalimantan Institut of Technology ]]>
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DOI: 10.35718/ismatech.v3i2.8481808
<![CDATA[Adolescence represents a critical stage of physical and cognitive development, requiring balanced nutrition to support growth, concentration, and academic performance. However, many students still lack awareness of healthy dietary practices and continue to consume nutrient-poor foods, leading to increased risks of metabolic and cognitive disorders. To address this issue, a dual-focus educational program was implemented at SMA Negeri 6 Penajam Paser Utara, combining balanced nutrition education with the introduction of simple renewable energy technology through biodiesel production from waste cooking oil. The program, conducted in collaboration with the Kalimantan Institute of Technology (ITK), employed interactive lectures, demonstrations, and hands-on sessions to enhance student understanding. A pre-test and post-test evaluation involving 40 students demonstrated a substantial improvement in knowledge, increasing from 45% to 96% after the intervention. Participants also expressed strong positive responses to the integration of nutritional awareness and eco-friendly technology, recognizing its relevance to daily life and environmental sustainability. The results show that this dual educational approach effectively strengthens students’ understanding of healthy eating habits while promoting environmental responsibility through waste-to-energy concepts. Overall, the program highlights the potential of combining nutrition education and renewable energy literacy as a strategic model for school-based community outreach aimed at fostering healthier, more environmentally conscious future generations.]]>
<![CDATA[The Effect of Hard Chine Planing Variations on Resistance and Stability of a Patrol Boat Hull ]]>
<![CDATA[Dani, Fildan Lujainid]]>;
<![CDATA[Raharja, Achmad Mukti]]>;
<![CDATA[Sihombing, Herawaty Magdalena]]>;
<![CDATA[Abadi, Galang Wahyu]]>
<![CDATA[ Indonesian Journal of Maritime Technology Vol. 3 No. 2 (2025): Volume 3 Issue 2, December 2025 ]]>
Publisher : <![CDATA[Naval Architecture Department, Kalimantan Institut of Technology ]]>
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DOI: 10.35718/ismatech.v3i2.8481802
<![CDATA[Patrol boat play a crucial role in maritime security and law enforcement, where optimizing hull performance is essential to achieve both efficiency and stability in various sea states. This study analyzes the influence of hard chine variations on the resistance and stability of a patrol boat hull. Four hull models single and double chine with angles of 0° and 10° were evaluated using Maxsurf Resistance and Stability. Total resistance was calculated at service speeds of 10 and 15 knots, while stability was assessed based on IMO Resolution A.749(18), Chapter 3. Results show that at 10 knots, the single chine 10° model produced the lowest resistance, whereas at 15 knots, the double chine 10° gave the best performance. Stability analysis indicated that all models met IMO criteria, with the double chine 10° achieving the highest GMt, maximum GZ, and angle of maximum GZ. The findings suggest that the single chine 10° is more efficient for calm-water operations, while the double chine 10° provides superior stability for rough-sea conditions]]>
<![CDATA[Technical and Operational Analysis of Marine Airbag-Assisted Ship Docking ]]>
<![CDATA[Puspa Ningrum, Ainun Chandra]]>;
<![CDATA[Yusril Syam, Muh]]>;
<![CDATA[Maulidah, Hikmah]]>;
<![CDATA[Wahidah, Jusma]]>;
<![CDATA[Jeremy Verian Sitorus, Chris]]>
<![CDATA[ Indonesian Journal of Maritime Technology Vol. 3 No. 2 (2025): Volume 3 Issue 2, December 2025 ]]>
Publisher : <![CDATA[Naval Architecture Department, Kalimantan Institut of Technology ]]>
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<![CDATA[Ship docking operations require careful planning and precise implementation to ensure safety and operational efficiency. One widely applied method in shipyard practice is the use of marine airbags to support vessels during docking and undocking processes. This study analyzes the application of a marine airbag-assisted docking system for the barge BG. Liana at PT. Jhonlin Marine Trans using an analytical and field-based approach. The analysis focuses on determining the required number of airbags, evaluating load distribution, and identifying factors contributing to airbag failure during docking operations. Vessel principal dimensions and marine airbag specifications were used as primary input parameters, while field observations were conducted to assess actual operational conditions. The results indicate that a minimum of 21 marine airbags is required to ensure adequate load sharing and structural safety; however, only seven airbags were deployed in practice, leading to excessive load concentration and increased risk of airbag failure. The failure analysis demonstrates that the observed damage was predominantly caused by controllable operational factors, including inadequate airbag quantity, improper placement, pressure inconsistencies, and runway conditions. These findings highlight the importance of strict compliance with analytical planning and operational procedures to enhance safety and reliability in marine airbag-assisted docking operations.]]>
<![CDATA[Strategic Human Capital Development for Maritime Infrastructure through Enhanced CAD Competency in Vocational Education ]]>
<![CDATA[Pratama, Fernanda Wahyu]]>;
<![CDATA[Wulandari, Amalia Ika]]>;
<![CDATA[Syam, Muhammad Anjas]]>;
<![CDATA[Wahidah, Jusma]]>;
<![CDATA[Agusty, Cindy Lionita]]>;
<![CDATA[Syahab , Husein]]>
<![CDATA[ Indonesian Journal of Maritime Technology Vol. 3 No. 2 (2025): Volume 3 Issue 2, December 2025 ]]>
Publisher : <![CDATA[Naval Architecture Department, Kalimantan Institut of Technology ]]>
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DOI: 10.35718/ismatech.v3i2.8481886
<![CDATA[The Indonesian maritime industry faces a critical human capital paradox, where a surplus of vocational graduates exists alongside persistent difficulty among shipyards in recruiting personnel capable of executing modern Product-Oriented Work Breakdown Structure and digital drafting workflows. This study investigates this disconnect through the pilot implementation of an Applied CAD for Maritime Engineering curriculum at a partner vocational high school, SMKN 5. Using a Guided Replication methodology, the intervention bridged the gap between theoretical software knowledge and industrial application by emphasizing parametric modeling and design-for-production logic. The results show that student aptitude is high, as evidenced by the rapid acquisition of three-dimensional modeling skills, while the national vocational infrastructure remains critically unprepared. The study identified a significant technological readiness gap in which existing school hardware was unable to support industry-standard software, requiring external technical intervention. These findings indicate that closing the maritime skills gap requires more than curriculum reform alone, but also necessitates fundamental improvements in school computing infrastructure and a pedagogical shift from software-centric instruction toward production-centric learning. This research proposes a scalable framework for integrating industrial competencies into vocational education to support the long-term development of Indonesia’s maritime workforce.]]>
<![CDATA[Assessment of Coconut Petiole Fiber–Reinforced Hybrid Composites as Sustainable Materials for Ship Components ]]>
<![CDATA[Pawara, Muhammad Uswah]]>;
<![CDATA[Alamsyah, Alamsyah]]>;
<![CDATA[Arifuddin, Andi Mursid Nugraha]]>;
<![CDATA[Ikhwani, Rodlian Jamal]]>;
<![CDATA[Syam, Muhammad Anjas]]>;
<![CDATA[Pratama, Fernanda Wahyu]]>;
<![CDATA[Mas`ud M, Ahmad Azwar]]>
<![CDATA[ Indonesian Journal of Maritime Technology Vol. 3 No. 2 (2025): Volume 3 Issue 2, December 2025 ]]>
Publisher : <![CDATA[Naval Architecture Department, Kalimantan Institut of Technology ]]>
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DOI: 10.35718/ismatech.v3i2.8481890
<![CDATA[The use of synthetic fibers in composite materials in the shipping industry provides mechanical advantages but produces non-biodegradable waste. This encourages the development of more environmentally friendly natural fiber-reinforced composite materials. This study examines the physical properties and tensile strength of composites made from a mixture of coconut petiole fibers and fiberglass, including the effect of immersion in seawater and freshwater for 30 days. The results show that the composites experience an average water absorption of 0.074% (freshwater) and 0.065% (seawater). Tensile tests show average tensile strength values of 35.837 MPa (freshwater), 31.890 MPa (seawater), and 41.290 MPa (without immersion). Immersion in an aqueous medium reduces the tensile strength due to interfacial degradation between the fiber and the matrix. Coconut petiole fiber–fiberglass composites have the potential to be an alternative material for ship components with competitive and environmentally friendly mechanical characteristics]]>
