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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 408 Documents
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Integrity Assessment of Wall Distorted of Buried Gas Pipeline Wira Herucakra; Luh Putri Adnyani; Lukytoardi Megantoro
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.48231

Abstract

In the oil and gas industry, the pipeline is the main mode to transport the product and can be applied for long-distance transportation; hence some pipe segments may be buried underground. Buckling as the main cause of pipeline deformation and failure is often found at the in-service buried pipeline during inspection activity. Changes in laying conditions such as design and operational parameters, human activity and geological movement can affect the redistribution of deformation that may lead to pipe buckling. This paper presents a methodology that integrates inspection results and finite element analysis for the distorted wall of the pipeline. Inspection reported anomaly cases of wall distorted at buried gas pipeline, and the result will be used to do stress analysis using finite element analysis. Three different conditions within the different treatment of bedding conditions were assessed: pipe buried on uncompacted soil, pipe buried with rock bedding, and pipe buried in compacted soil. The result shows that the deteriorated pipe can be considered acceptable when buried in compacted soil. This condition may be used for further action and consideration, such as a mitigation strategy to maintain the safety and integrity of the deteriorated pipe.
Study on Implementation of Lean Six Sigma in Hospital Auxiliary Ship Block Construction Process Muhammad Rizki Kurniawan; Rr. Rochmoeljati
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 19, No 3 (2022): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v19i3.46155

Abstract

During the pandemic, transportation is needed to support the evacuation of patients through waterways; therefore, PT PAL Indonesia (Persero) has created a Hospital Auxiliary Ship project. In building a quality Hospital Auxiliary ship project, productivity is needed so the project can be completed properly. However, there are problems with the punctuality of completing the ship block construction with a total lead time of 19200 minutes and found the block quality is not up to standards like Surface Porosity, Former Stopper, Arc Strike, and Low Bead defects that require a rework process and cause long cycle times. This study aims to reduce the lead time value and minimize waste or activities that are not value-added using the lean six sigma method with stages (DMAIC). From the results of the study, it was found that the identification of the Process Activity Mapping (PAM) design, which resulted in the highest waste rating, namely 16.94% defect, with CTQ-4, lean six sigma value of 3.055 sigma and DPMO value of 59917 which was included in the excellent category for the industry average. The factors causing the problem were identified with Pareto diagrams and causal diagrams to determine the dominant type of defect and the causes of wastage of defects; there are four factors, namely material, human, machine, and environment. Recommendations for the improvement of waste are through material inspection, operator training, reworking defective blocks, and minimizing non-value-added activities. With the design of process activity mapping (PAM) and value stream mapping, the efficiency of ship block construction can increase from 67.81% to 74.06%.
Criticality Analysis for Research Vessel Machinery System Maintenance Strategy. Study Case: RV. Baruna Jaya Muryadin Muryadin; Fariz Maulana Noor; Dimas Fajar Prasetyo; Rio Dwi Sakti Wijaya
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.49351

Abstract

In recent years, marine survey operations such as survey operations for underwater communication cables and tsunami early warning systems have become an annual activity involving research vessels in Indonesia. Along with the increasing age of the ship, it will be followed by a decrease in the performance of the machinery system. Maintenance of the machinery system is carried out to maintain the desired performance by ship users. However, with a large number of machinery system equipment and limited resources, an analysis is needed to prioritize which equipment or components need regular maintenance and monitoring activity. By classifying all assets into a hierarchical form and performing a risk-based criticality analysis, equipment will be prioritized based on the probability of failure and the level of consequence. By determining the probability of failure of a component based on historical data and reference failure data, and determining the consequences for health safety (HS), production (P), Environment (E), and Containment (Cn), the risk would be obtained. From this analysis obtained as many as 766 equipment and components consisting of 38 rotary equipment, 45 static equipment, 196 piping components, and 487 instruments. The risk analysis obtained as many as 23 (3%) of equipment in H (high), 138 (18%) in the M (medium) condition, and 605 (79%) in the L (low) condition. The criticality results determined that 161 (21%) equipment in H & L conditions would be carried out planned maintenance and 605 (79%) equipment in low condition would be carried out unplanned maintenance.
Passengers and Crew's Evacuation from Passenger Ships Under Fire: An Agent-Based Model Simulation Study Ahmad Firdhaus; Imam Pujo Mulyatno; Muhammad Luqman Hakim; Zen Zen
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.50714

Abstract

The characteristics of the passengers have a significant impact on how the evacuation procedures are carried out. During an evacuation, the amount of time it takes depends on how quickly passengers move. There is a correlation between age and travel speed, but not always. As a result of this problem, a significant number of passengers were unable to make it to the assembly point in time for the evacuation, which may have resulted in fatalities. An evacuation simulation will be carried out aboard passenger ships in the event of a fire. This research will employ agent-based modeling to perform the simulation, and it will include modifications for day and night, as well as for the number of emergency stairs used. The findings of this study are the simulation times for the evacuation of passengers and crew for each scenario, with the shortest time for evacuation occurring during the daytime with operational emergency stairs, clocking in at 36.51 minutes, and the longest time for evacuation occurring during the night with damaged emergency stairs, clocking in at 47.43 minutes. Both times are given in minutes. According to the findings, the evacuation circumstances satisfied the standards set by the IMO, which demanded that the entire amount of time spent evacuating be less than or equivalent to sixty minutes
Analysis of Material Supplier Selection in Laminated Bamboo Shipyards Using the Analytical Hierarchy Process Method Abdul Rachman Safarudin; Heri Supomo; Wikaranosa Scotiandharu Supomo
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.49449

Abstract

The material supply chain is an essential part of the shipbuilding industry. For this reason, it is necessary to select suppliers who can support the material needs of ship production. Qualitative and quantitative factors are multi-criteria problems in supplier selection. The Analytical Hierarchy Process (AHP) method effectively determines an integrative approach to supplier selection. This research is applied to a laminated bamboo shipyard to evaluate several companies that can be used as material suppliers. The analysis was carried out using expert choice software by calculating the weight of each criterion and sub-criteria. The analysis results obtained the priority of the primary material supplier with the Kediri area (S1) as the supplier of bamboo material for ship construction with a global weighting value of 0.363. PT. An (S5) located in the Surabaya area is the next top priority as a supplier of adhesive and finishing 1st material components with global weighting values of 0.434 and 0.427, respectively. PT. E (S9) is located in the Semarang area as a priority supplier of finishing 2nd material components with a global weighting value of 0.490. UD. G (S11) is located in the Surabaya area as a priority supplier of ship mold components with a global weighting value of 0.456. In addition, UD. J (S14), located in the Surabaya area, is a priority supplier of material components for clamps, sanding, and cutting blades with a global weighting value of 0.496 and 0.351.
Comparative Study of Welding Material Elasticity with the SMAW Process for 2G Positions Between Before and After Using Welding Machines with Augmented Reality Technology Arief Syarifuddin; Erdina Arianti; Kusnindar Priohutomo; Rosi Dwi Yulfani; Berlian Arswendo Adietya; Aurista Miftahatul Ilmah; Taufan Prasetyo
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.49248

Abstract

The high cost of certification and the low pass percentage in welding certification are common issues for beginner welders. The use of Augmented Reality (AR) technology is expected to solve these issues. The results of the penetrant, bending, and tensile tests showed that the welder who had used the AR welding machine produced better welding specimens than before they practiced using the AR welding machine. The penetrant test after beginner welder practiced using the AR welding machine produces rounded defects with a defect size of 1,44 mm (accepted by ASME Section V), whereas before they practiced using the AR welding machine it produces defects that cannot be accepted by the criteria. The maximum open discontinuity length in the bending test on the welded specimen after welder practiced using the AR welding machine is 2,90 mm (accepted by ASME Section IX), whereas the bending test before welder practiced using the AR welding machine is not accepted by the citeria. The tensile test results after welder practiced using the AR welding machine were 410,00 and 455,66 N/mm2 for the maximum tensile stress. This value exceeds the minimum tensile strength of SA-36 carbon steel, which is 400 N/mm2. When compared to the specimen before the welder practiced using the AR welding machine, the modulus of elasticity produced after the welder practiced using the AR welding machine is also smaller, indicating that the material has better elasticity. Based on the results of the tests, it can be seen that the AR welding machine can be used for the implementation of competency certification because the quality of the weld results is better, there are fewer risks (sparks, eye irritation, and burns), and the use of welding consumables is reduced
Study of Purse Seine Fishing Ship Trimaran Seakeeping with Axe-Bow and Without Axe-Bow Model Using Computational Fluids Dynamics Fella Gaspersz; Agustinus Tupamahu; Richard Benny Luhulima; Simon Tubalawony
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.47092

Abstract

Maluku waters are dominated by extreme weather conditions with wave heights of 1-5 meters. Purse seine fishingvessel is one type of fishing vessel that has very poor transverse stability. One way to improve the stability of theship is to change the shape of the monohull ship to a ship with a trimaran hull type. This research was focused onexamining the movement characteristics of purse seine fishing vessels with trimaran hull type with Axe-Bowmodification on the bow and without Axe-bow, through computational fluid dynamics. The use of Axe-bow ontrimaran is able to significantly reduce RMS Pitch, which is an average of 13.35% smaller when compared to Trimaranwithout Axe-bow. On the RMS Heave Trimaran Axe-bow can reduce an average of 5.27% if the Trimaran is withoutAxe-bow. Furthermore, the Trimaran Axe-bow is also able to reduce the RMS Roll by an average of 3.98% comparedto the Trimaran without Axe-bow. The results of this study can provide an initial description of the advantages ofusing the Axe-Bow on the Purse seine fishing trimaran ship.
Maturity of Digital Transformation in the Shipping Industry: A Case Study Among Enterprises in Gulf Cooperation Council (GCC) Countries Tif Said Suhail Al Mazroui; Maathir Mohammed Saud Al Alawi; Khafiya Sultan Hamood Al Wahaibi; Bashayar Badar Saif Al Amri; Mohammed Muneerali Thottoli
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.51246

Abstract

Digital maturity describes an organization's readiness and ability to change and implement models to remain competitive in the marketplace. Digital transformation (DT) can streamline processes, reduce errors, and increase the speed of operations in the shipping industry, leading to greater efficiency and cost savings. Companies that adopt DT effectively will be better positioned to compete in the rapidly evolving shipping industry. To achieve competitive benefits from the potential of DT, shipping businesses must understand their digital maturity state. The shipping industry lacks a uniform approach to DT, leading to inconsistencies in implementation and measurement. Many shipping companies are hesitant to adopt new technology and processes, leading to slow implementation and limited impact. Hence, the main goal of this case study is to determine the DT maturity of companies in the Gulf Cooperation Council (GCC) countries in shipping. This case study focuses on the maturity of DT in the shipping industry. With an exploratory approach, the aim of the research is to assess the level of DT maturity among shipping companies in the GCC region. This study employs firstly a qualitative, case study methodology and considered items shipping methods, market operating, services provided, technological initiatives, and the company's goals for technological development of three shipping companies, Asyad, Clarion, and Yht Cargo to analyze data. Then a literature review is compiled from 8 papers published between 2020-2023 in international peer-reviewed journals or conference proceedings, obtained through a bibliographic search in the Scopus database. The findings suggest that coercive and mimetic pressures are primarily responsible for digital change. The benefits of DT have been discovered to assist maritime companies use their resources more efficiently, resulting in increased operational efficiency, improved client connections, and increased sustainability.
Reliability-Based Analysis of Main Propulsion Fuel Oil System Maintenance for Tugboats with Qualitative and Quantitative Methods Imam Pujo Pujo Mulyatno; Keyza Taqi Wafi; Sarjito Jokosisworo; Tuswan Tuswan
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.49335

Abstract

This study aims to analyze the maintenance of the main propulsion fuel oil system for tugboats using both qualitative and quantitative methods. The focus is on evaluating the reliability of the system and identifying potential areas for improvement. The research employs a combination of expert interviews, industry standards, and statistical analysis to provide a comprehensive overview of the maintenance practices in place. The goal is to enhance the overall performance and longevity of the main propulsion fuel oil system in tugboats. The study uses data on the operational time, failure time and frequency, the number of vessels served, and fuel system diagrams to analyze the system's reliability. Qualitative methods such as Failure Mode and Effect Analysis (FMEA) and Fault Tree Analysis (FTA) were used, as well as quantitative methods such as Overall Equipment Effectiveness (OEE), Markovian Decision Process (MDP), and reliability methods. The study found that the FO Purifier component was the critical component with a Risk Priority Number (RPN) of 294. The average value of OEE was 47%, lower than the standard of 85%. The MDP analysis showed a probability of 0.08 for mild damage and 0.46 for moderate to severe damage under steady-state conditions. The FO Purifier component had the lowest Mean Time to Failure (MTTF) value of 1658.50 hours. The study provides a graph of the reliability function against time, and recommends maintenance actions based on the MTTF and MDP.
Development of Hybrid CNG/Diesel Dual-Fuel Engine in High Load Condition for Marine Debris Vessel Frengki Mohamad Felayati; Erik Sugianto; Nilam Sari Octaviani
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 20, No 1 (2023): February
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v20i1.51069

Abstract

Greenhouse gas (GHG) emissions are the most influential issue in the transportation sector in recent years due to their impact on the environment. Thus, the design of transportation power plants is necessary to ensure the lowest GHG emissions. However, the development of a small vessel power plant is discussed in this study. The small vessel is a marine debris working vessel that has the purpose of collecting marine debris on the water surface with a conveyor. This vessel is designed with a dual-fuel engine fueled by natural gas from CNG and diesel fuel in high load conditions. Furthermore, the power system is designed with a systematical assessment condition based on the operational condition. Moreover, an experiment was conducted to study the performance and emissions of the engine. The hybrid system is designed with several operational conditions, such as sailing, collecting, and maneuvering. Most of the operations can be used in the hybrid dual-fuel system with nearly similar engine torque to diesel mode. The dual-fuel hybrid system has a significantly low engine fuel consumption with low CO2 emissions. However, relatively high NO2 and CO emissions are still considerable.

Page 34 of 41 | Total Record : 408

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