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INDONESIA
KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan
Published by Universitas Diponegoro
ISSN : 18298370     EISSN : 23019069     DOI : 10.14710/kapal.
Core Subject : Science,
Earth & Planetary Sciences
Jurnal ini merupakan Jurnal Ilmiah untuk mengembangkan ilmu dibidang Ilmu Pengetahuan & Teknologi Kelautan. Jurnal ini diterbitkan oleh Teknik Perkapalan Universitas Diponegoro 3 (tiga) kali dalam 1 tahun pada bulan Februari, Juni dan Oktober.
Arjuna Subject : -
Articles 8 Documents
 1 
Search results for , issue "Vol 22, No 1 (2025): February" : 8 Documents clear
Risk Analysis of Ship Collision and Modelling of Oil Spill Trajectory Study Case : Dumai Port Noor, Fariz Maulana; Handani, Dhimas Widhi; Muryadin, Muryadin; Sari, Dian Purnama; Wijaya, Rio Dwi Sakti; Prasetyo, Dimas Fajar; Setiyobudi, Nanang; Putra, Arfis Maydino Firmansyah; Malakani, Arga Iman; Afandi, Mohamad Imam
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 1 (2025): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i1.67794

Abstract

Dumai Port is a significant natural port in Sumatra, characterized by deep waters sheltered from waves and calm currents due to surrounding islands. It plays a crucial role in the export of Crude Palm Oil (CPO) and the operations of Pertamina's RU II, which are expected to increase, leading to a rise in ship traffic. In response to this growing vessel traffic, this paper analyzes ship collision frequency and models the dispersion of oil spills as a potential consequence. The ship collision analysis utilizes the Integrated Waterway Risk Assessment Program (IWRAP), combining vessel traffic data over a year with the port's bathymetric data. The analysis revealed a total collision frequency of 0.589766 across various scenarios, including head-on, overtaking, crossing, bending, and merging, which is considered acceptable as it falls below the threshold of one collision per year. Additionally, oil spill trajectory modeling was conducted using two types of oil and two wave heights. In the 2000 m³ oil spill modeling at a height of 0.5 m, the crude oil model showed 68.4% still floating, while the product oil model had 41.7% floating. In the 1.5 m modeling, the crude oil model had 29% floating, and the product oil model had 16.2% floating. Based on these results, the chosen cleanup methods include oil booms, skimming, and dispersants. Effective oil spill cleanup requires collaboration among various stakeholders to ensure the process is carried out efficiently and accurately.
A Review of Systematic Methodologies for Shipyard Facility Layout Design Pambudi, Ghulam Tulus; Gunawan, Gunawan; Muzhoffar, Dimas Angga Fakhri; Sari, Wanda Rulita
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 1 (2025): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i1.64694

Abstract

The dynamic and complex nature of the shipbuilding industry necessitates efficient facility layout planning to optimize operational efficiency and minimize costs. Traditional layout design approaches, often based on practical experience, fall short of achieving optimal results. This paper reviews three advanced methodologies for shipyard facility layout design: heuristic algorithms, Systematic Layout Planning (SLP), and graph theory. Heuristic algorithms, including genetic algorithms and simulated annealing, offer flexible and rapid solutions but may not always achieve global optimization. SLP provides a structured and methodical approach, ideal for stable environments, yet lacks flexibility in dynamic settings. Graph theory enhances the layout design process by optimizing spatial relationships between facilities through weighted planar graphs. The study highlights the strengths and limitations of each method, with a focus on their impact on material handling costs and overall layout efficiency. Among these, the combination of Genetic Algorithms (GA) and Stochastic Growth Algorithms (SGA) stands out, demonstrating significant reductions in material handling costs, up to 23.1%. The review concludes that while each methodology has its merits, the integration of GA and SGA offers the most robust solution for optimizing shipyard layouts, particularly in complex and large-scale environments. Future research should explore hybrid models that combine these methodologies, incorporating advanced computational techniques and real-time data analytics to create more dynamic and adaptable layout solutions, addressing the evolving needs of the shipbuilding industry.
Analysis of the Effect of Shielding Gas Composition and FCAW Parameters on Shipbuilding Steel Plate for Ship Hull Production Al Amin, Mochammad Karim; Soelistijono, Rafi Febian; Nisazarifa, Adristi; Ma'ruf, Buana; Nugroho, Priyambodo Nur Ardi; Mustaghfirin, Muhammad Anis; Putera, Erwien Yuliansyah; Irawan, Bambang; Anggara, Dika; Widodo, Eriek Wahyu Restu; Bachtiar, Bachtiar; Ibad, Ilham Khoirul; Pratama Putra, Mochammad Yudha Aditya
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 1 (2025): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i1.67434

Abstract

Shielding gas is an important thing to protect the weld metal from impurities during the welding process. Ar, CO2, and mixing gas of Ar-CO2 are often used as a shielding gas in the marine industry. Differences in shielding gases and the current of welding could affect the microstructure and hardness of welding. This research analyzed the microstructure and hardness from the FCAW process of Shipbuilding Steel Plate using mixing gas and shielding gas of 100% CO2 with variations of current 180 and 195 A. The filler metal which has been used was A 5.20 E-71T1. The microstructure for the weld metal with 100% CO2 shielding gas was pearlite, widmanstatten ferrite, grain ferrite, and polygonal ferrite; otherwise for mixing shielding gas of 80% Ar + 20% CO2 and 75%Ar + 25% CO2 was found, the structure of pearlite, grain ferrite, and acicular ferrite. The effect of variations in the shielding gas composition and welding current that produced the highest hardness value was achieved with a shielding gas composition of 80% Ar + 20% CO2 and a current of 195 A, resulting in a hardness of 159.2 HV in the weld area.
Numerical Simulation of Sedimentation Patterns at the Tallo River Estuary (Case Study of New Makassar Container Terminal 2) Umar, Hasdinar; Rahman, Sabaruddin; Tuharea, Natasha Dewanti
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 1 (2025): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i1.67855

Abstract

The increase in community activities in the Makassar waters has made the government plan long-term development by exploiting the potential of the sea through coastal reclamation, which aims to meet increasingly limited land needs, one of which is the construction of the New Makassar Container Terminal 2. This development causes changes in coastal sedimentation patterns and current patterns. This research aims to determine the flow patterns and sediment patterns that occur in the Tallo River Estuary due to the construction of the New Makassar 2 Container Terminal and simulated with a numerical hydrodynamic model using scenarios resulting from tidal measurements and wind as generators. The research results show that the flow pattern around the Tallo River Estuary before and after the construction of the New Makassar 2 Container Terminal decreased by 51.288% from 0.105 m/s to 0.051 m/s. The direction of the current at the highest tide conditions moves from the open sea towards the estuary, while at the lowest low tide conditions, it moves from the estuary towards the open sea. The distribution of sediment in the waters of the Tallo River Estuary shows that changes in the basic morphology of the Tallo River Estuary tend to be high; namely, in the review lines 1 - 5, there is a change in sedimentation of 0.055 m; 0.096m; 0.048m; 0.158 m and 0.059 m. So, it can be concluded that the construction of the New Makassar 2 Container Terminal affects the water conditions in the Tallo River Estuary.  
Post-Fire Ship Hull Repair Method Considering Corrosion Rate and Mechanical Properties Baihaqi, Imam; Supomo, Heri
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 1 (2025): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i1.71686

Abstract

Ship accidents due to fire will result in several consequences, especially concerning the structure of the ship. The very high temperature of the ship fire will greatly affect the mechanical properties and corrosion resistance of the ship's construction materials after the fire. This study will investigate the relationship between mechanical properties and corrosion resistance of materials to the temperature that occurs during the fire. The mechanical properties are examined by testing the tensile strength of the material after the fire. As for corrosion resistance, corrosion speed testing will be carried out using the 3-electrode cell method. The experimental temperature variations used are 300°C, 500°C, 600°C, 700°C, and 900°C. Based on the results of the study, it can be concluded that the higher the fire temperature, the mechanical properties also increase. This increase in tensile strength reaches a culmination point at a temperature of 600°C and then tends to decrease with increasing fire temperature. As for the corrosion speed, the change phenomenon is also almost the same pattern. The higher the temperature of the ship fire, the corrosion speed will increase significantly. The increase in the corrosion rate value in post-burn ship materials will continue to increase. So based on the experiment, it can be concluded that post-burning material can still be refurbished if the temperature is <600°C, with a tensile strength of 445 MPa and a corrosion rate of 0.5 mmpy.
Implementation of Failure Mode and Effects Analysis in the Maintenance Strategy for the Main Engine Cooling System Pump of Fishing Vessels Siahaan, Juniawan Preston; Yaqin, Rizqi Ilmal; Tumpu, Mula; Hermawan, Ade; Nugroho, Setyawan Dwi; Prakoso, Bagas; Luthfiani, Febi; Zein, Lukman Adria Saputra
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 1 (2025): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i1.67419

Abstract

The performance of the main engine of a fishing vessel becomes less than optimal when its cooling system does not function properly. Centrifugal pumps, as an important component of the cooling system, require special attention in selecting maintenance methods to maintain stable performance. This study aims to investigate the maintenance strategy of centrifugal pumps in the cooling system of the main engine of a fishing vessel. The Failure Mode and Effects Analysis (FMEA) method is used to analyze maintenance strategies based on RPN values. The resulting RPN value can indicate the maintenance strategy that needs to be carried out. The highest RPN value and the failure mode category that requires special attention are analyzed using a histogram diagram. While the root cause of failure is clarified with a fishbone diagram. The results show that the highest failure mode is damage to the pump impeller due to corrosion. The main cause of this failure is found in the selection of impeller materials that are less suitable for working conditions and the environment. Predictive maintenance strategies are considered as a solution to overcome pump impeller problems. This study provides insight into choosing the right maintenance strategy, especially for fishing vessel engines.
The Effect of Speed On Bow Thruster Tunnel Acoustics Using Computational Fluid Dynamics Methods Wahyudi, Dedy; Coutsar, Ardan Nagra; Nugroho, Putro Adi
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 1 (2025): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i1.69453

Abstract

The increasing global emphasis on sustainability and environmental conservation has driven the maritime industry to adopt technologies aimed at minimizing ecological impacts, particularly underwater noise pollution. As a significant environmental issue, underwater noise affects marine ecosystems, altering the behavior, physiology, and survival of marine fauna, while contributing to broader ecological shifts. This research investigates the acoustic properties of a vessel's bow thruster tunnel, focusing on noise generation at varying operational speeds. The study utilizes Computational Fluid Dynamics (CFD) simulations with ANSYS Fluent to analyze the relationship between fluid flow and acoustic behavior within the tunnel. Simulations conducted using CFD ANSYS Fluent reveal that high acoustic concentrations occur at the tunnel due to significant pressure differences between the interior and exterior. Results show that acoustic levels increase with ship velocity, ranging from 81.39 dB at 10 knots to 108.86 dB at 28 knots. To mitigate noise, a cone ring inlet design is proposed to reduce pressure differences and the ship's acoustic signature. These findings underscore the importance of vessel speed in influencing underwater noise levels, which can affect operational efficiency, marine ecosystems, and ship performance. The study highlights the need for a multi-faceted approach, incorporating hull design, propulsion systems, and operational strategies, to minimize acoustic impacts and promote sustainable maritime practices.
The Application of Nanocoating and Cold-Dip Galvanization on Mitigating Corrosion for Ship and Offshore Mooring Chains Orji, Charles U; Nitonye, Samson; Asuquo, Felix U
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 1 (2025): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i1.65061

Abstract

Corrosion is a major challenge for marine vessels and offshore mooring systems due to the aggressive maritime environment characterized by high salinity, biological activity, and temperature variations. This study explores the effectiveness of nano-coatings derived from waste snail shells compared to traditional cold-dip galvanization in mitigating corrosion on ANSI A36 steel mooring chains. Three specimen groups—nano-epoxy composite coating, cold-dip galvanized, and bare metal—were tested in fresh and saltwater environments over a five-week period. Water composition, pH, and salinity were analyzed using Atomic Absorption Spectroscopy (AAS) to assess their influence on corrosion behavior. Weekly measurements of corrosion rates were taken to evaluate the protective performance of each treatment. The results demonstrated a significant reduction in corrosion rates for both nano-coated and galvanized samples compared to bare metal. Specifically, the nano-epoxy coating reduced corrosion from 0.13 mm/week to below 0.02 mm/week, while cold-dip galvanized samples showed a similar decline, converging around 0.02 mm/week. Bare metal, however, stabilized at approximately 0.05 mm/week. These findings suggest that nano-coatings are a promising, sustainable alternative to conventional galvanization, enhancing the durability and operational lifespan of mooring systems and offshore structures. This advancement supports the offshore industry’s need to meet stringent classification guidelines and extend the design life of critical components. Further long-term exposure studies are recommended to confirm the sustained effectiveness of nano-epoxy coatings in marine environments.

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