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IJOCE (International Journal of Offshore and Coastal Engineering)
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : -     EISSN : 25800914     DOI : -
Core Subject : Engineering,
Engineering
IJOCE, International Journal of Offshore and Coastal Engineering, is an academic journal on the issues related to offshore, coastal and ship science, engineering and technology. Published quarterly in February, May, August, and November.
Arjuna Subject : -
Articles 202 Documents
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Resource Empowerment and Optimization of Beach Tourism Facilities in Delegan, Gresik, East Java Mahmud Mustain; Sujantoko; Anggita Deva Ariyanti
International Journal of Offshore and Coastal Engineering Vol. 9 No. 1 (2025)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j225800914.v9i1.4514

Abstract

The discipline of Integrated Coastal Zone Management (ICZM) is still growing, especially in Indonesia, but its implementation is still relatively young. This study focuses on beach tourism. Ecotourism development and management is one of the efforts to utilize local resources that must be optimal. Delegan Gresik Tourism Beach, East Java, is a management research area for ecotourism development. This research aims to determine the potential of existing resources in Delegan Beach attractions and make scenarios for development plan efforts. This is done through Strengths, Weaknesses, Opportunities and Threats (SWOT) analysis and interviews to determine resource potential, development alternatives and priorities, both through analysis of internal and external factors. The results of this study show that forms of stakeholder participation influence the determinants of the development of natural tourism areas on Delegan Beach. The resulting development directions include the use of various resources, the development of facilities as community business opportunities, the empowerment of community skills, the Improvement of regional socialization, and efforts to preserve the environment.
Influence of Geometric Parameters on Fatigue Life of Two-Planar Tubular DKT Joints Based on Fracture Mechanics Under a Combination Loading Muhammad Akbar Hardian; Rudi Walujo Prastianto; Ilham Kurniawan
International Journal of Offshore and Coastal Engineering Vol. 9 No. 1 (2025)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j225800914.v9i1.4521

Abstract

According to SKK Migas, Indonesia has operated 613 units of offshore platforms which is 54.65% of the platforms are more than 20 years old, and 24.63% are between 16-20 years old. With the extension of its operation time, the structural integrity of the old platform will decrease. One of the potential consequences is structural failure due to cyclical loading caused cracks. . This research aims to determine the influence of geometric parameters in DKT twoplanar tubular joints on fatigue life based on fracture mechanics. By varying geometric parameters, we can see the influence of geometric parameters on fatigue life under combined loads of axial, in-plane bending, and out-of-plane bending moments. The tubular joints are modeled locally and analyzed using Finite Element Analysis (FEA), and the crack is modeled as a semi-elliptical form. Fatigue life analysis is performed by varying geometric parameters under the combined loads. After carrying out a sensitivity analysis on all geometric parameters, it was concluded that the gamma parameter had the most influence on the combined load with a sensitivity of 89%.
Factors that Influence Performance Assessment of the Number of Seafarer Requests in the Manning Agency Muhammad Akbar; Tri Achmadi; Murdhifin Zulmy Widya Kurniawan
International Journal of Offshore and Coastal Engineering Vol. 8 No. 2 (2024)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i2.4865

Abstract

Manning Agency, better known as the Barombong Maritime Polytechnic, founded BMP Manning Agency as a forum for producing reliable and professional sailors in the global maritime industry. Based on the results of social and stakeholder studies as well as several literature reviews, it is known that prospective ship crews who will be transferred to Manning agency partner companies set several quality standards apart from the administration and expertise that prospective crew members have because the Manning agency's task is to prepare ship crews, so this aspect is also a significant concern in addition to the theory of expertise required. For this reason, this research covers the problem of assessing the self-quality of seafarers, which indicates a problem and challenge that seafarers must resolve. The Manning agency and Borombong Maritime Polytechnic need to improve the image and quality, especially the number of seafarers transferred to the Company, so that they not only fulfil the requirements at the beginning but still maintain self-quality until going into the field to work. The method used is multiple linear regression, where it is known that the variables that influence the number of sailors transferred are the Discipline Level Variable (X1), the Responsibility Level Variable (X3) and the Team Cooperation Level Variable (X4) with model goodness of 74.41%. Therefore, the Manning Agency must pay more attention to these three variables.
Analysis of the Global Structural Strength of a 35,000 DWT Single Point Mooring (SPM) Buoy Under Wave Loads Elsa Rizkiya Kencana; Muhammad Fatkhurrozi; Alvin Aziz Nugraha; Olga Wulandari Kelen
International Journal of Offshore and Coastal Engineering Vol. 8 No. 2 (2024)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i2.4870

Abstract

Single Point Mooring (SPM) systems are offshore structures facilitating cargo transfer between tankers and refineries in deeper waters to accommodate larger vessels. The marine environment at SPM sites often features unstable and extreme wave conditions, making it essential to understand the SPM's response to these forces. SPMs include an anchor system with mooring lines secured to the seabed. Evaluating the stress on these lines and the buoy structure under environmental loads is crucial. This research models the SPM structure using dimensional data and mooring line specifications. The hypothesis posits that, based on the significant wave height and 100-year wave period in the Balongan Sea, as well as the minimum breaking load value for a 35,000 DWT SPM, the maximum tension in the mooring lines is 956 kN, which is below 2261 kN. It means safe based on API RP 2KS (2005) standards. Thus, the mooring lines are safe during operations under 100-year environmental loads with a maximum tension of 1732 kN. The maximum stress on the SPM buoy structure is 1.87 MPa and 3.38 MPa in ULS and ALS conditions, respectively.
Gulf of Lampung Bamboo Fixed Net Cages Structural Design Identification Shila Atika Sari; Mochammad Fathurridho Hermanto; Elsa Rizkiya Kencana; Nafisa Nandalianadhira
International Journal of Offshore and Coastal Engineering Vol. 8 No. 2 (2024)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i2.4871

Abstract

Renewable materials are being discussed and researched more recently. One renewable source of material is plants, either with a long life like wood or a short life like bamboo. In Indonesia, bamboo is widely used also for the structures of fixed net cages. This research aims to analyze the structure of the fixed bamboo net cage installed in the waters of Gulf Lampung. The analysis used in this paper is in place. The in-place analysis will give the unity check and deflection result due to load combined by the standard BKI Guidelines for Aquaculture. Based on the results, the structure has met the standard in operation conditions with the maximum unity check value of 0.52 on the group pile. Nevertheless, the largest unity check value of 1.20 on group piles in storm conditions is due to increased lateral loading. The result of deflection already has good serviceability, with a maximum horizontal deflection value occurring in storm conditions of 0.58 cm and a maximum vertical deflection in operation conditions of 0.89 cm. The structure of the fixed net cages has yet to meet the requirements during storm conditions by unity check.
Analysis of the Influence of Infrastructure, Costs, and Services for the Crew's PT. PELNI on Customer Satisfaction Using Principal Component Analysis (PCA) Method Hilda Emeraldo Ahmad Adiarsa; Mokhamad Aufal Huda; I Gusti Ngurah Sumanta Buana
International Journal of Offshore and Coastal Engineering Vol. 8 No. 2 (2024)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i2.4872

Abstract

The presence of efficient port infrastructure is of utmost importance in ensuring the seamless functioning of both cargo and passenger operations. In addition to infrastructure, providing high-quality service by a ship's crew is equally important to derive from the infrastructure. Another factor to consider is whether the cost levied for services and infrastructure meets the community's expectations, as excessive costs without adequate infrastructure and services will result in dissatisfied customers. Therefore, customer satisfaction cannot only be assessed from one aspect but must be seen from various aspects, which in this study will be seen from the infrastructure, costs, and crew services. This research focuses on ships owned by PT. PELNI because this company is one of the largest in Indonesia, leading in great demand for sea transportation services. The research on infrastructure aspects, costs, and crew services includes supporting aspects to link them to customer satisfaction with PT. PELNI will be analysed using the Principal Component Analysis (PCA) method. The principal component (PC) can be utilised for feature selection and variable interpretation for data with several variables and a correlation. The results found that infrastructure (X1) can explain the factor variance of 45.309%.
The Role of Merak Vessel Traffic Service (VTS) in the Implementation of Traffic Separation Scheme (TSS) in Sunda Strait Ananda Firsta Tea Relevania Purnama; Atika Khoirul Umaroh; Setyo Nugroho
International Journal of Offshore and Coastal Engineering Vol. 8 No. 2 (2024)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i2.4874

Abstract

Merak Vessel Traffic Service (VTS) is pivotal in Indonesia's critical maritime traffic network, particularly within the bustling Sunda Strait. This waterway holds immense strategic importance, serving as the primary link between Java and Su-matra Islands and intersecting with the vital Indonesian Archipelago Sea Lane. The Indonesian Government implemented a Traffic Separation Scheme (TSS) in July 2020 to enhance safety and navigation. Despite three years of TSS implementation, concerns persist regarding compliance and safety within the Sunda Strait. This research employs qualitative methods to address these concerns, chiefly in-depth interviews with VTS operators. The overarching objective is to gain profound insights into the intricacies of TSS implementation and the array of challenges it faces. The findings reveal several significant challenges. These include the lack of robust law enforcement and insufficient socialisation efforts regarding TSS regulations, concerns related to weather conditions impacting maritime operations, limitations in VHF radio modulation affecting communication, and issues surrounding vessel compliance with directives from VTS operators. In light of these challenges, future recommendations should prioritise strengthening law enforcement mechanisms, intensifying educational initiatives, improving communication technology, enhancing weather monitoring capabilities, and exploring ways to strengthen vessel compliance with VTS instructions.
Strength Analysis of the Floating Pier Structure with Passenger Ship 116 GT (Case Study: Sanur Harbor, Bali Province) Eliezer Bertram Free Buana; Sholihin Sholihin; Kriyo Sambodho
International Journal of Offshore and Coastal Engineering Vol. 8 No. 2 (2024)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i2.4875

Abstract

The pier is one of the primary means of sea transportation that continues to be developed to support equity activities and advance the community's economy. Bali is one of the main tourist destinations in Indonesia. The construction of the Sanur Floating Pier will create good connectivity between regions in Bali, which can become an additional tourist destination so that tourists can vacation longer in Bali. The purpose of this study was to determine the strength of the floating jetty structure through an analysis of the loading received by the structure and the resistance of the piles so that they can carry out designs related to the installation of strong and safe floating dock piles. In the analysis process, the author uses the help of Plaxis V.8.6 software to model the soil and AutoCAD 2018 as a support system in making the floating dock pile installation layout. The analysis results show that the floating dock can accept the forces acting on the structure. The UE RPD 250 fender and the T-Head MT 20 type bollard are the right choices. The pile has a lateral force value (H) of 1907 kg with a deflection of 0.19 mm. The greater the number of piles installed on the floating pier, the stronger the structure is evidenced by the smaller pile settlement due to soil changes.
Pipeline End Manifold (PLEM) Structural Response Analysis due to the Settlement Process Ichwandanny Faturahman Darobi; Murdjito Murdjito; Hasan Ikhwani
International Journal of Offshore and Coastal Engineering Vol. 8 No. 2 (2024)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i2.4876

Abstract

Burst Pressure Analysis on Corroded Pipeline Using Finite Element Method Mahadi Yahya Sormin; Yoyok Setyo Hadiwidodo; Nur Syahroni
International Journal of Offshore and Coastal Engineering Vol. 8 No. 2 (2024)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i2.4877

Abstract

The oil and gas industry includes exploration, extraction, production or processing, and transportation. One of the important activities in the oil and gas industry is the hydrocarbon transportation system. The most commonly used hydrocarbon transportation facility is the subsea pipeline. Pipes operating in a marine environment can easily corrode. Corrosion will cause a metal loss on the pipe surface and worsen the strength of the pipe. The thinning of the pipe surface due to corrosion will result in localized holes of varying depths and uneven shapes on the outer and inner surfaces. A burst pressure will occur if the internal pressure in the pipe with corrosion defects exceeds the allowable internal pressure limit. Therefore, to prevent burst pressure, it is necessary to evaluate the residual strength of the pipe in order to determine whether the defective pipe with working pressure can continue to operate safely or not. The internal pressure value calculation results are as follows: until the pipe fails, it is considered to burst using an FEA of 19.42 MPa. Meanwhile, the internal pressure value using standard codes DNV-RP-F101 is 18.76 MPa. For the effect of variations in the dimensions of the corrosion defect size, the most influential is the length and depth of the defect due to a decrease in the graph that does not fluctuate. The percentage differences between the failure pressure values resulting from rectangle and semi-ellipsoidal corrosion defects and the burst pressure values from the burst test experiments are 0.61% and 0.15%, respectively.

Page 20 of 21 | Total Record : 202

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