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All Journal REKAYASA IJOCE (International Journal of Offshore and Coastal Engineering) Proceedings of The ICECRS
Daniel Mohammad Rosyid
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Agriculture, Biological Sciences & Forestry Computer Science & IT Education Electrical & Electronics Engineering Engineering Languange, Linguistic, Communication & Media Mathematics Physics

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Risk Analysis on Leakage Failures of Pipelines Using Hybrid Risk Analysis Method Daniel Mohammad Rosyid; Bassam Muhammad Drehem; Agro Wisudawan
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 1, No 2 (2017)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (373.234 KB) | DOI: 10.12962/j2580-0914.v1i2.7057

Abstract

In this final project has been conducted a study on risk analysis on subsea pipeline leakage by using hybrid risk analysis method. The study begins by determining the scope of the analysis using fault tree analysis which can be determined the main event of the leakage failure of subsea pipeline until the basic event. After determining the scope of the analysis then proceeded to calculate the frequency of each event using the quantitative method. In this calculation is known the frequency of basic event through data from scientific paper programming and scientific research and then calculated the frequency result of top event using Boolean Equation until we get the frequency of failure due to leakage pipelines for 0.0141213. After knowing how big the probability of failure, followed by determining how much impact or consequence of the failure. The consequences of failure are determined based on their impact on safety, environment, and business. In the determination of the impact with the qualitative method using questionnaires interviews to some respondents. After obtaining the result of questionnaire interview then calculated the mean of the questionnaire result to determine how big impact of the failure is based on safety, environment, and business. After knowing how big the probability and consequences of the failure, then determine the position of the risk zone on the risk matrix that refers to DNV RP-G101. After knowing the position of the risk zone, it can be determined how to control risk based on cause-effect.
Scheduling and Network Analysis on Cooling Water Pipe Fabrication Project Ekky Rizky; Silvianita Silvianita; Daniel Mohammad Rosyid
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 6, No 1 (2022)
Publisher : DRPM (Direktorat Riset dan Pengabdian kepada Masyarakat) ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i1.13148

Abstract

Optimizing costs and time and manpower planning are very important in project management. The case study raised in this research is a cooling water pipe fabrication project with a processing time duration of 231 days and a project cost allocation of Rp. 306,545,488,000. The method used to control project delays is earned value analysis, and to optimize the project is done by shortening the project duration and minimizing project cost losses using the crash program method. The results of the earned value analysis stated that the project experienced delays, exceeded budget costs and was subject to project delays penalties, which was 340 days of completion time more than 111 days from the planned time and with a total final project cost of Rp. 331,813,410,524.46 more than Rp. 25,267,922,524.44 of the costs that have been prepared. Then an effort was made to accelerate the duration of the project with three scenario options. From the results of the crash cost calculation, it is found that the final total cost estimate for scenario 1 with 3 hours overtime is Rp. 289,043,553,541. Scenario 2, the estimated total final cost with 4 hours overtime is Rp. 289,051,063,021 and scenario 3 the estimated total final cost with the addition of workers is Rp. 289,310.359,861. So, the scenario that can be used by PT. X in order to minimize losses is to impose 3 hours overtime with an estimated total final cost of Rp. 289,043,553,541.
Pendidikan Bagi Generasi Emas Indonesia Abad 21: Sebuah Agenda Perubahan Paradigmatik Daniel Mohammad Rosyid; Masroro Lilik Ekowanti
Proceedings of The ICECRS Vol 1 No 3 (2018): Being Professional Teachers to Face Golden Generation in 2045
Publisher : International Consortium of Education and Culture Research Studies

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (81.707 KB) | DOI: 10.21070/picecrs.v1i3.1386

Abstract

If the social phenomenon is a reflection of nature's thought, our culture and value system, then the multidimensional crisis afflicting our society today requires us to re-examine our educational philosophy and practice at least the past 40 years. We suffer all the bad influences of industrialization as part of the colonial process, precisely because we adopt the most advanced instrument, namely, mass schooling system with an obsession for quality-based standard as the magic spell. In this digital era, the effort of liberating society from the colonial, pioneer of independence as a condition of the proclamation of independence was a reform of the national education system. We should be scheduled deschooling society. This agenda includes the following: the paradigmatic shift from the school system to learning webs based Self Organized Learning Environment (SOLE); mass schooling to individualized, customized learning; of relevance to quality; of technical competence to the independence of the soul or creativity. This reform was way back on the three pillars of education philosophy of Ki Hajar Dewantara: family, community, and College. New demands upon the role of the teacher in the 21st century is changing.
Sizing Optimization Using Genetic Algorithm to Achieve Minimal Offshore Structure Ferdita Syalsabila; Rudi Walujo Prastianto; Daniel Mohammad Rosyid
Rekayasa Vol 15, No 2: Agustus 2022
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v15i2.15102

Abstract

Accelerating marginal field development must consider the economic factor. While the structural strength must remain capable and robust when subjected to environmental loads. To meet the desired objective in design phase, optimization is used. With the rapid growth of computing technology, the optimization method is developed as more advanced and reduced iteration time. However, the structural evaluation of jacket structure is a complex problem. The usual process of structure evaluation is through finite element analysis, and it is still time-consuming. Thus, surrogate models can evaluate the structure, lowering computational time. This study optimizes the jacket structure to get an affordable and robust minimal jacket structure. Sizing optimization will be performed on the jacket's leg and bracing thickness. For single-objective optimization, weight structure is considered the objective function, and multi-objective optimization adds production cost as the second objective function. The surrogate model uses the radial basis function to predict the relation between design variables and ultimate limit strength. The functions generated from the surrogate model will act as behaviour constraints in the optimization process. For consideration, X-type and V-type bracing configurations are compared. Different results were obtained from the single objective and multi-objective optimization process.
Mooring Chain Fatigue Analysis at the Single Point Mooring Ardjuna Marine Terminal Due to the Combination of Wave, Current, and Wind Loads Using the Fracture Mechanics Method Rafi Manaf Mawardi; Daniel Mohammad Rosyid; Rudi Walujo Prastianto
International Journal of Offshore and Coastal Engineering Vol. 10 No. 1 (2026):
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962//j225800914.v10i1.9915

Abstract

Mooring chain failure in Single Point Mooring (SPM) systems is a critical risk in offshore operations due to cyclic and complex environmental loading. The combination of waves, currents, and winds produces stress fluctuations that trigger crack initiation and propagation that can potentially lead to structural failure. This study analyzes the fatigue behavior of mooring chains in SPM at Ardjuna Marine Terminal, Java Sea, using a fracture mechanics approach. Cracks are modeled as semi-elliptical surface cracks, and the crack propagation rate is predicted using Paris Law based on Stress Intensity Factor (SIF) evaluation through numerical simulations. The motion responses of SPM and FSO are analyzed using Executive software, while the mooring chain stress analysis is performed using Dynamic simulation software. The results show a maximum SIF value of 1821.8 MPa√mm with a deviation of 1.6% from the analytical solution. The crack propagation rate increases from 2.65×10⁻⁸ to 3.02×10⁻⁵ mm/cycle, resulting in a total fatigue life of 8.3 years. These findings emphasize the importance of fracture mechanics-based evaluation to support inspection and maintenance strategies for SPM mooring systems.
Responses Analysis of Tubular Joints in Offshore Substation Jacket due to Settlement During the Roll Up Process Wildan Malika Candra Alfatih; Daniel Mohammad Rosyid; Rudi Walujo Prastianto
International Journal of Offshore and Coastal Engineering Vol. 10 No. 1 (2026):
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The Offshore Substation plays a crucial role in ensuring the success of Offshore Wind Farm systems in the clean energy transition. During the fabrication stage, the jacket structure used as the Offshore Substation undergoes a fabrication process known as roll-up. During this roll-up process, ground settlement at the fabrication yard may occur, causing the jacket structure to tilt and increasing the risk of structural failure, which can reduce the effectiveness of the jacket structure’s integrity. In this study, a roll-up analysis of the jacket structure was conducted using SACS software with variations in roll-up angles of 0°, 30°, 45°, 60°, 75°, and 96.4°. The analysis results indicate that during the roll up process under settlement conditions, several critical areas were identified, particularly at the K-joint and X-joint, with maximum unity check (UC) values of 0.994 and 0.982, respectively. Further investigation was carried out through a local analysis using finite element software. The local stresses obtained were 264.6 MPa at the X-joint and 323.9 MPa at the K-joint. Since the stress at the K-joint exceeded the allowable stress, a thickness increase of 10 mm was applied to the brace experiencing the maximum stress. As a result, the stress was reduced by 172.29 MPa and was brought below the allowable stress limit.
Local Stress Analysis on Pipeline End Manifold (PLEM) Due to Pipeline Walking in Subsea Pipeline Rizki Cahya Illahi; Daniel Mohammad Rosyid; Rudi Walujo Prastianto
International Journal of Offshore and Coastal Engineering Vol. 10 No. 1 (2026):
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962//j225800914.v10i1.9917

Abstract

The Pipeline End Manifold (PLEM) is a key component in offshore oil and gas subsea systems that serves as a distribution point for fluid flow from subsea pipelines. One phenomenon that can affect its structural integrity is pipeline walking, which is the progressive axial movement of a pipeline caused by pressure and temperature cycles during operation. This study aims to evaluate the effect of pipeline walking on the stress and deformation of a PLEM structure. Numerical modeling was carried out using AutoPIPE to determine the axial displacement of the pipeline, while ANSYS based on the finite element method was used to analyze the structural response of the PLEM. The results show that pipeline walking produces a maximum axial displacement of 78.5994 mm. The maximum Von Mises stress of 61.222 MPa occurred in the 10-inch piping section, while the maximum deformation was 0.1305 mm. These values indicate that the structure remains within safe limits and possesses sufficient stiffness under the analyzed loading conditions.
Health and Safety Analysis for Fisherman in East Surabaya, Indonesia Santi Frestiqauli; Daniel Mohammad Rosyid; Wimala Lalitya Dhanistha; Anita Kusuma Wardhani; Shade Rahmawati; Madea Eka Silfiani
International Journal of Offshore and Coastal Engineering Vol. 10 No. 1 (2026):
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962//j225800914.v10i1.9919

Abstract

The number of fishermen in Indonesia has continued to decline in the last decade as reported by the Statistics of Marine and Coastal Resources 2021. In 2010 the number of fishermen was recorded at 2.16 million people. But in 2019, the number was recorded at only 1.83 million people. Thus, there was a decrease in the number of fishermen by 330,000 people in 2010-2019. The fisheries sector is one of the most dangerous industries. In contrast, the health and safety of the people, especially fishermen are too far below occupational health and safety feasibility standards. This research used job safety analysis method for hazard identification and risk assessment for fisherman activities during preparation, operation, and pasca-operation. Data were collected through observation and interview 30 fishermen in East Surabaya. Results of observations divided by three activities shows that fishermen don’t prepare themselves with safety kit or safety equipment, including for personal protective equipment. The conclusion is most potential hazards could be minimized by using personal protective equipment. To minimize the risk of fatality, fishermen should carry a first aid kit, and communication devices and should be accompanied when going to sea. There are future research and program to increase fisherman awareness prior to safety.
Operational Risk Assessment of a 150,000 DWT Single Buoy Mooring Muhammad Bayu Abisatya; Silvianita sil; Daniel Mohammad Rosyid
International Journal of Offshore and Coastal Engineering Vol. 10 No. 1 (2026):
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962//j225800914.v10i1.9922

Abstract

Single Buoy Mooring (SBM) is a critical offshore facility used for tanker berthing and fluid transfer in oil and gas distribution systems, where complex interactions between vessels, mooring components, mechanical equipment, and dynamic marine environments generate significant operational risks. This study assesses the operational risks of a 150,000 DWT SBM system using a semi-quantitative Hazard Identification, Risk Assessment, and Risk Control (HIRARC) approach integrated with expert judgment. Hazard identification was conducted across all operational stages, including approaching, mooring, fluid transfer, and departing. Risk assessment was performed by evaluating the Likelihood of Failure (LoF) and the Consequence of Failure (CoF), with CoF assessed across safety, environmental, and asset/operational dimensions. Risk ranking employed a worst-case approach by selecting the maximum risk value among the three dimensions. The results indicate that hazards related to mooring chain integrity, pretension control, and swivel sealing systems present high to very high-risk levels. Further analysis using Bow-Tie Analysis highlights escalation pathways and the effectiveness of existing control barriers. The study demonstrates that the integrated HIRARC and Bow-Tie framework provides a practical basis for prioritizing operational risk controls in large-capacity SBM systems under limited historical failure data.
Co-Authors Agro Wisudawan Anita Kusuma Wardhani Bassam Muhammad Drehem Ekky Rizky Ferdita Syalsabila Madea Eka Silfiani Masroro Lilik Ekowanti Muhammad Bayu Abisatya Rafi Manaf Mawardi Rizki Cahya Illahi Rudi Walujo Prastianto Santi Frestiqauli Shade Rahmawati Silvianita sil Silvianita Silvianita Wildan Malika Candra Alfatih Wimala Lalitya Dhanistha