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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 92 Documents
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Priority Infrastructure Development on Tablolong Beach Tourism Kupang Regency - East Nusa Tenggara Johannis, Dian Erlina Wati; Trisnoyuwono, Diarto; Mata, Abia E.
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 7, No 2 (2023)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v7i2.19331

Abstract

The Tablolong beach area is one of the natural tourism objects in Kupang Regency. However, it is not matched by adequate tourist area infrastructure. This study aims to analyze the required infrastructure to assess the existing condition of infrastructure in the Tablolong beach area using a qualitative descriptive analysis, analyzing the IPA (Importance-Performance Analysis) level of importance of infrastructure in tourist areas and providing recommendations for infrastructure development directions. The results of the study indicate that the priority infrastructure developed to support the fisheries and trade services sector are 1) provision of domestic waste management facilities (laundry waste and toilets), provision of a clean water network system, provision of waste disposal sites; 2) handling potholes in road conditions and asphalting of roads that are still pavement; 3) provision of various modes of transportation and drainage systems, especially in fishing settlements and beaches; 4) provision of transportation support facilities, improvement of telecommunications performance, improvement of electricity network performance in the Tablolong Beach area under the development of the area.
Analysis of the Effect of Sinker on Bearing Capacity of Anchor in Calm Buoy Mooring System: Case Study of SBM Pengapon Semarang Murdjito, Murdjito; Djatmiko, Eko Budi; Melani, Agnes Teresa
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 8, No 1 (2024)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i1.20465

Abstract

The addition of sinkers on the mooring line is generally used to support the anchor in maintaining its position in extreme environmental conditions. In this study, the author will analyze the effect of sinkers on the mooring line tension and the bearing capacity of the anchor. The sinker variations in this analysis are 10, 15, and 20 tons, which will be added to the asymmetric mooring line of CALM Buoy SPM Pengapon Semarang. The type of anchor SPM is Stevpris MK III on soft clay soil type. The author first analyses the line tension in each environmental loading condition and then analyses the anchor's bearing capacity. The analysis results show that the largest tension occurs in line 3 without a sinker in DEC conditions with an environmental load direction of 314.24 deg, 1301.19 kN (End A) and 1310.43 kN (End B). In the analysis of the holding capacity of the anchor, the author refers to the SOF ABS Class 2019 and the charts of Appendix D2 and D6 API RP 2SK. The results indicate that the gradation of weight and position of the sinker causes the line tension between the sinker and the fairlead to increase linearly, with an average percentage increase of 1.35%. Meanwhile, the bearing capacity of the anchor, which includes required holding capacity, anchor weight, and estimated drag distance/fluke length, decreased with an average percentage of 7.46%, 15.39%, and 4.79%. Based on the consideration of the End A tension analysis results in the DEC condition, it is stated that the 20-ton sinker in position 1 is a suitable variation of the sinker in this SPM Pengapon Semarang case study.
Padeye Strength Analysis of Topside Offloading Platform due to Loadout Using Lifting Method Prayoga, Ilham Kharisma; Hadiwidodo, Yoyok Setyo; Handayanu, Handayanu
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 8, No 1 (2024)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i1.20455

Abstract

Lifting is one method in the loadout process. Lifting is the activity of moving a structure using the help of a crane. The loadout process moves the structure from the yard to the barge. In this study, a lifting analysis was carried out on the topside offloading platform structure. The analysis also considers the center of gravity shift factor, dynamic load factor (DAF), and other safety factors that occur in the structure during the lifting process. Dynamic load factor using Dynamic Amplification Factor. Cog shift during lifting affects the amount of load being lifted. The most significant load received by the lifting point is 872.507 kN at lifting point 3. During the lifting process, no failure was found in the structural members, as evidenced by the maximum UC value of 0.87. The Padeye used is designed according to the DNV OS-H205 criteria. Several checks on the padeye structure were carried out, comparing the stress that occurred with the allowable stress on several stress reviews, such as tensile stress, shear stress, and bending stress. Local analysis was also carried out on the padeye structure to determine the stress on the padeye structure. Local analysis of the padeye structure was conducted using the ANSYS Workbench software. The results of the regional analysis showed the equivalent von-mises of 164.96 MPa in the padeye structure and 140.04 MPa at the joints, with the allowable stress of ASTM A36 steel material of 250 MPa.
Analysis of the Effect of Infrastructure System at Kendari New Port Terminal on Container Customer Satisfaction Using Principal Component Analysis (PCA) Method Muhammad, Fadel; Natalia, Tia; Achmadi, Tri
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 8, No 1 (2024)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i1.20460

Abstract

Container Terminal Kendari New Port, located in Kendari, Southeast Sulawesi Province, is known to be one of the gateways for international logistics flow with adequate facilities and systems implemented where one of its activities is loading and unloading of containers supported by a reasonably large pier measuring 300 square meters. Even though it is equipped and supported by adequate infrastructure, it is not uncommon for customers to feel that the system and infrastructure provided are unsatisfactory. For this reason, in this study, satisfaction indicators are in the form of price (X1) and facilities (X2), and all of these variables have several indicators to determine customer satisfaction with the infrastructure offered using the PCA method. The PCA method is advantageous when the existing data has a large number of variables and has a correlation between the variables. In general, the principal component can be helpful for feature selection and interpretation of variables. The results of this study indicate that there is one variable that has an eigenvalue more significant than one, which indicates that this variable has a cumulative proportion of 58.278%, which means that 1 factor can absorb information in the data of 58.278% where the variable is Price (X1).
Local Analysis of The Padeye-Brace Clamp Structure Strength during Installation of Riser-Spool at Offshore Platform Prastianto, Rudi Walujo; Nahar, Yusapril Hagie Syamsun; Hadiwidodo, Yoyok Setyo
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 7, No 2 (2023)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v7i2.19332

Abstract

The need for natural gas in Indonesia has developed very rapidly, thus encouraging the construction of many production support facilities. One of them is the Wellhead Platform B (WHP-B) in West Pangkah waters, East Java. This production platform is in shallow water conditions with a depth of less than 5 m and a distance of less than 5 km from the shoreline. Therefore, when the pipe installation process is carried out, a crane barge or construction vessel type cannot be used. To be able to connect the gas flow from the well to the production platform (WHP-B), it requires a supporting structure in the form of a spool and riser. The size of the spool and riser that will be installed on WHP-B is 16” and 6” with the condition that the riser and spool are connected. A crawler crane carried by a barge can be used for the installation process to occur efficiently. For the 16”-6” riserspool to be lowered simultaneously, it requires a temporary structure that serves to clamp the two pipes so that they can be installed simultaneously. This structure is a modification between the padeye and the brace clamp. The process of lowering the 16”- 6” riser-spool experienced a critical condition when it was in the splash zone. Based on the global analysis results, it is known that the UC that occurs is 0.97 with a vertical bending stress of 172.36 MPa in the 3rd padeye-brace clamp structure. After conducting local analysis on the 3rd brace clamp, it is known that the clamp structure is still in a safe condition with a maximum von Mises stress of 2.42 MPa and a maximum deformation of 0.0096 cm.
Risk Analysis of Equipment Loss During Marine Survey Operation by Integrating Fault Tree to Bayesian Network Waskito, Dwitya Harits; Muhtadi, Ahmad; Prasetyo, Dimas Fajar; Kurniawan, Indra; Haryanto, Dwi; Riyadi, Adi Slamet
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 8, No 1 (2024)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i1.20466

Abstract

The process of deploying and towing the survey equipment for several marine survey activities is essential since it visualises the seabed and improves data accuracy. Since the equipment is deployed to an underwater level, the risk arises with the deployment. These risks include potential contact with submerged objects and the seabed, which can result in the loss of equipment and have detrimental environmental consequences. This study aims to analyse the risk-associated factors related to the loss of survey equipment using Fault Tree Analysis (FTA) and Bayesian Network (BN). The constructed FTA was converted into BN to find the relationship between Basic events and simulate the probability of updating Basic events. The sensitivity analysis results of the BN model indicate that "Procedure Failure" is the Basic contributor to the loss of survey equipment. The findings from this study will have practical implications for stakeholders, enabling them to enhance the safety of marine survey activities, particularly by mitigating the occurrence of equipment loss during operational procedures.
Evaluation of International Shipping Alliance: A Case Study of Transport Capacity and Cost Efficiency Influence the Quality of Cooperation Inter-Country Using Discriminant Analysis Natalia, Tia; Muhammad, Fadel; Achmadi, Tri
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 8, No 1 (2024)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i1.20462

Abstract

Shipping is a source of income that entrepreneurs increasingly demand because of the public's high use of this service, both for traveling and sending and transporting goods. Shipping companies offer their services domestically and cooperate with foreign shipping companies to increase revenue. In addition to increasing revenue, this business can increase the quality of cooperation between countries, which can be seen from transportation capacity and cost efficiency because more fleets will be provided, and infrastructure will be adequate because it consists of more than one country. Even though the shipping system cooperates with other countries and has an international standard, this does not necessarily satisfy the public with the service in the form of transportation capacity and fees charged. Not infrequently, many people complain that the costs incurred are quite high, but the implemented system is not following what most people expect. To see the quality of cooperation between countries (Y), this research will look at the transportation capacity factor (X1) and also cost efficiency (X2) using the discriminant analysis method. Discriminant analysis is a statistical method used to categorize an object into two or more groups based on the independent variable (X) used. The results obtained in this study show that the majority of people are satisfied with the existence of an international shipping alliance that is equal to 78%, with only cost efficiency (X2) being the main factor affecting customer satisfaction with the resulting classification accuracy rate of 71% and good models by 61%. 
Post-Pandemic Risk Assessment and Safety Management at Academic Institution Environment Frestiqauli, Santi; Nandalianadhira, Nafisa; Hermanto, Mochammad Fathurridho; Samuel, Samuel
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 7, No 2 (2023)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v7i2.19333

Abstract

The World Health Organization (WHO), on March 11, 2020, declared the novel coronavirus (COVID-19) outbreak a global pandemic. Safety, people protection, equipment and environmental protection are serious concerns anywhere, including in an institution or university environment. In the meantime, the number of accidents has increased in academic institutions nationwide. Students, staff, lecturers, and academic personnel are involved in activities that expose them to minor to major fatal accidents. This study developed risk assessment using combinations of hazards and risk factors to scale measures in a risk reduction action plan. Health, safety and environment risk assessment conducted for 27 assessed hazardous activities at 18 locations divided into three areas: laboratories, public facilities, and offices at the Department Ocean Engineering Sepuluh Nopember Institute of Technology. The frequency and severity of health hazards were higher in accumulation number, which is 790, compared to safety hazards, which score 509, and environmental hazards, with 104. The highest number for accumulation of potential hazards in health, safety, and environment for laboratories area is 883, followed by accumulation of potential hazard at health, safety, and environment for office area and public facilities area with scores 239 and 281.
Analysis of Constraints in Implementing Inaportnet at Sorong Port Class 1 Firdani, Arief Nashrul; Supomo, Heri
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 8, No 1 (2024)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i1.20467

Abstract

This research examines the challenges that arise when expanded logistics operations are conducted utilizing the Inaportnet program, which has been in place at KSOP Class 1 in Sorong City since 2017. This study examined a population using the inaportnet application at the Port of Sorong City. Using a qualitative descriptive methodology, The inaportnet application, which is currently being improved, users or stakeholders who need guidance with how to use the application, and the occasionally in-interfered-with signal in the Port of Sorong City are a few challenges that must be overcome. It is hoped that the findings of this analysis and discussion will provide information and recommendations for implementing Inaportnet at the Port of Sorong City to ensure service fairness (first come, first served), realize transparency of ship and goods services at the Port, hasten the completion of ship and goods services, and reduce costs associated with handling ship and goods services.
Reliability and Risk Analysis of Lubrication System on Sabuk Nusantara 43 Suardi, Suardi; Setiawan, Wira; Alamsyah, Alamsyah; Wulandari, Amalia Ika; Hidayat, Taufik
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 7, No 2 (2023)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v7i2.19319

Abstract

This study aims to present a systematic approach to evaluating the reliability of the lubrication system on the Sabuk Nusantara 43. The methods used in conducting risk assessments are quantitative methods and qualitative methods or semi-quantitative methods. In the quantitative method, the approach taken is more to the value (number) approach. Meanwhile, in the semi-quantitative method, the approach used is a qualitative approach and a quantitative approach. This method can identify potential events that not only cause disruption to pipeline operations but also events related to safety and the environment. The results showed that the biggest risk in the installation of Sabuk Nusantara 43 lubricant was found in the filter section with damage levels reaching five times in one year with risk matrix plotting in the major category (Not Acceptable) and risk control options (recommendation). Selection of filter components that are better and fulfill standards of existing rules, regular maintenance and checking, and avoiding the use of lubricating oil that is too old and used.

Page 8 of 10 | Total Record : 92

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