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All Journal Jurnal Teknik ITS IPTEK The Journal for Technology and Science IJOCE (International Journal of Offshore and Coastal Engineering) International Journal of Marine Engineering Innovation and Research Jurnal Pertahanan dan Bela Negara Sewagati
Rosyid, Daniel Mohammad
Departemen Teknik Kelautan, Institut Teknologi Sepuluh Nopember, Kampus ITS, Keputih, Sukolilo, Surabaya 60111
Arts Humanities Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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Penerapan Literasi Bertema Teknik Kelautan dalam Proses Pembelajaran Siswa SMPIT Al Uswah Surabaya Rudi Walujo Prastianto; Daniel Mohammad Rosyid; Kriyo Sambodho; Yeyes Mulyadi; Murdjito; Abdul Azhim; Sri Sumardiani
Sewagati Vol 7 No 3 (2023)
Publisher : Pusat Publikasi ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j26139960.v7i3.520

Abstract

Indonesia adalah negara maritim terbesar di dunia dengan potensi kelautan yang sangat besar. Dahulu, kerajaan Nusantara seperti Majapahit dan Sriwijaya telah berhasil mengelola laut untuk kejayaan dan kemakmuran rakyatnya. Ironisnya saat ini secara umum tingkat literasi masyarakat Indonesia terhadap bidang maritim atau kelautan sangat rendah. Salah satu penyebabnya ditengarai karena di dalam kurikulum pendidikan dan proses pembelajaran di sekolah-sekolah di Indonesia kurang membahas bidang kelautan. Untuk itu perlu diawali dengan membangun kembali paradigma dan pemikiran maritim/kelautan/bahari pada jiwa generasi muda sejak dini. Makalah ini menyajikan hasil kegiatan pengabdian kepada masyarakat (abdimas) yang bertujuan untuk menyediakan bahan literasi berupa buku bertema bidang teknik kelautan/maritim dan menerapkannya dalam proses pembelajaran siswa kelas VII SMPIT Al Uswah Surabaya. Metode kegiatan abdimas ini terdiri dari penyusunan buku bertema Teknik Kelautan, pembelajaran bidang kelautan melalui guru tamu di sekolah, dan kegiatan outbound di obyek wisata kelautan. Dengan cara ini diharapkan dapat menambah pengetahuan siswa terhadap bidang kelautan/maritim dan akan merangsang minat siswa pada bidang ini; sehingga akan terbentuk generasi masa depan yang berwawasan kelautan sebagai warisan jiwa bahari nenek moyang bangsa Indonesia dan siap belajar serta menekuni bidang kelautan untuk masa depannya kelak demi kemajuan bidang kelautan/maritim di Indonesia.
Pushover Analysis of Ageing Offshore Jacket Platform in Shallow Water Under Extreme Storm and Mitigation Strategy for Platform’s Life Extension Budi Setiawan; Daniel Mohammad Rosyid; Rudi Walujo Prastianto
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 1 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i1.4733

Abstract

Many offshore jacket platforms worldwide have approached or exceeded their original design life but are still in use and productive. According to the international codes, standards, and industry best practices, structural assessments of ageing fixed offshore jacket platforms shall be conducted against relevant target values to assess whether it is fit for purpose or risk reduction measures should be considered for continuing its operation. This research examines the collapse behaviour of an ageing offshore jacket platform under extreme storm conditions. Nonlinear collapse analysis has been performed to assess fixed offshore jacket platforms' structural integrity and reliability in shallow water under extreme storm conditions. Two tripods and 4-legged jacket platforms at water depths between 30 to 80 meters, located in the Mahakam Delta, Kalimantan, Indonesia, have been selected in this research as wellhead platform models commonly installed in shallow water. Sensitivity studies examine the effects of pile-soil interaction, variations in pile depth, topside load adjustments, marine growth removal, and jacket strengthening on structural performance. From the structural integrity and reliability perspective, the findings highlight that strengthening the jacket by adding soldier piles is the most effective approach for extending the platform's lifespan, especially for a wave-dominated platform. Additionally, a cost feasibility analysis is advised for future evaluation to determine whether jacket strengthening is viable or if alternative risk reduction strategies should be further explored for the ageing offshore platform.
Jacket Structure Design Optimization to Reach Minimum Construction Cost Aufar Syahmi Faris Sumardi; Daniel Mohammad Rosyid
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 1 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i1.4736

Abstract

Offshore jacket structures are essential components in platform construction, requiring optimization due to high material, fabrication, and coating costs. The objective of this research is to achieve cost-effective designs without compromising safety. The methodology employs Sequential Quadratic Programming (SQP) with a surrogate-based approach to optimize structural dimensions, while reliability is assessed using Monte Carlo Simulation to account for uncertainties. Optimization conducted in MATLAB resulted in significant improvements in the dimensional reduction of most design variables, including a 20.32% reduction in total construction costs. Material, fabrication, and coating costs decreased by 19.05%, 28.11%, and 6.14%, respectively. The reliability index (Beta) of critical members improved to a range of 3.12–3.29, exceeding the safety threshold of 3.09.
Reliability of Jacket-Type Structure Considering the Reserve Strength Ratio (RSR) Brigitta Violyna El Tito; Rudi Walujo Prastianto; Daniel Mohammad Rosyid
International Journal of Marine Engineering Innovation and Research Vol. 9 No. 2 (2024)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i2.5000

Abstract

The projected demand for energy globally will continue to rise by 45% by 2030, with an average growth rate of about 1.6% per year. Oil and gas are estimated to fulfil about 80% of the world's energy needs. One facility that supports oil and gas exploitation is an offshore structure of the jacket-type platform. The challenge in building a jacket platform is the reliability of the structure. Offshore structures are designed to withstand extreme wave loads that can cause the collapse of individual components or the entire structure. This paper aims to analyze the reliability of the structure with the ultimate limit state. The author performs an ultimate strength analysis using the Nonlinear Pushover Analysis method to obtain the Reserve Strength Ratio (RSR) and a reliability analysis using the Monte Carlo Simulation (MCS) method. This analysis shows that the RSR minimum of 9.33 occurs with a 135° loading direction. The MCS results show that the Jacket platform has a high level of reliability of 0.99997, which fulfils the minimum required reliability for offshore structures.
Reliability Analysis on the Effect of Subsea Buoy to the Tension of Spread Mooring System Madea Eka Silfiani; Rudi Walujo Prastianto; Murdjito Prastianto; Daniel Mohammad Rosyid; Eko Budi Djatmiko
International Journal of Marine Engineering Innovation and Research Vol. 8 No. 4 (2023)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i4.5107

Abstract

A lot of research has been carried out regarding variations in mooring systems, one of which is the addition of buoys to the mooring system. In analyzing variations in mooring system designs, what needs to be considered is the reliability of the mooring lines. Therefore, in this research will analyze reliability on the effect of subsea buoy to the tension of mooring line with a variation position of subsea buoy. The variations on the position of one subsea buoy is arranged at the distance of the anchor 605 m, 577.5 m, 550 m, 522.5 and two subsea buoys at the distance from the anchor 605 m and 467.5 m. The analysis was performed for stand alone and offloading conditions with wave directions of 0 °, 45 °, 90 °, 135 °, 180 °. In this study to find the reliability of mooring lines, the author uses the Mean Value First Order Second Moment (MVFOSM) method. The results from this study, the probability of failure in the offloading condition without subsea buoy is 4.897E-17 and with subsea buoy (522.5 m) is 4.018E-17. Probability of failure in the stand alone condition without subsea buoy is 2.763E-16 and with subsea buoy (522.5 m) is 1.881E-16. From the probability of failure, the reliability of mooring lines in the offloading condition and stand alone condition without subsea buoy and with subsea buoy (522.5 m) is 1.00. The reliability calculation determined by DNV-OS E301, the results obtained meet the specified reliability criteria.
Fatigue Life Analysis of FSO Mooring Chain by Considering the Effects of Offloading Load Hafizh Muhammad Naufal Shidqi; Nur Syahroni; Daniel Mohammad Rosyid; Dewinta Putri Cahyaningtyas
International Journal of Marine Engineering Innovation and Research Vol. 8 No. 2 (2023)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i2.5457

Abstract

Mooring chains are critical components in the maritime industry used to secure ships and floating oil and gas platforms such as FSOs to stay in their designated positions. The loads exerted on mooring chains during routine operations and additional loads during offloading operations can cause structural fatigue. Therefore, fatigue life analysis of mooring chains is essential to ensure safety and optimal performance. This study aims to conduct fatigue analysis of mooring chains by considering an important factor, namely the influence of offloading. Offloading load refers to the additional load exerted on the mooring chain during loading and unloading operations. The mooring system configuration uses a spread mooring system of 8 chains (4x2), 87 mm in diameter, with 20% pretension. In the fatigue analysis, the "Palmgren-Miner" method was used to evaluate the accumulated damage caused by cyclic loads. Then, the "Rainflow Counting" method is used to identify and count the number of load cycles that occur so that later the fatigue life can be calculated and known. From the research results, it was found that the mooring system configuration design still meets the safety factor requirements recommended by API RP 2 SK both during SLS, ULS, and FLS analysis. In SLS and ULS conditions, the greatest tension value is when the FSO is in the Ballast load condition, with the maximum value of tension that occurs is 2207.4 kN in SLS conditions, and 4151.6 kN in extreme conditions. In the FLS condition analysis, it was found that with an offloading frequency of 24 times per year (1271.89 hours), in the design configuration, the influence of the offloading system can increase up to 7% of the fatigue damage that occurs, and the lowest fatigue life, reduced by 3 years. The least fatigue life occurs in Chain 1.2 at the splash zone segment, which is 67 years.
Pipe Stacking Optimization and Sea Fastening Analysis of Linepipe Transport Daniel Mohammad Rosyid; Raditya Danu Riyanto; Carlo Jonathan Sihombing
International Journal of Offshore and Coastal Engineering Vol. 4 No. 2 (2020)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i2.9340

Abstract

Subsea pipeline is a system comprised of multiple linepipes that are welded when installed on location used to distribute fluid such as oil and natural gas. Fabricated linepipes are to be stacked on cargo barge and transported to the installation location. This operation takes significant time and involves numerous linepipes. Optimization needs to be done to make sure the transport operation is executed efficiently. Optimization attempt was done using data from Double Joint Linepipe Transport Operation of Tangguh Expansion Project by Saipem Indonesia. Parameters considered during the optimization process include linepipe qualities during stacking, cargo barge strength and stability, and sea fastening property strength. Roark’s Formulas for Stress and Strain formulas are used in pipe stacking analysis to find stacking limit for each type of linepipes. Stability analysis is done by using DNVGL-ST-N001 as a guide and Maxsurf software for modelling. SACS software is used to analyzed sea fastening properties with guidance from DNVGL-ST-N001. Finally, optimization is done using a multi-criteria optimization method by using values from each analysis as parameters. Optimization results find that pipe stacking method using side support is 8.41% more optimal than standard pipe stacking method from Saipem Indonesia.
Risk Based Inspection using API RP 580 and DNV RP F116 Towards Free Spanning Pipelines Yoyok Setyo Hadiwidodo; Daniel Mohammad Rosyid; Iftinaniffah Qonitah
International Journal of Offshore and Coastal Engineering Vol. 5 No. 2 (2021)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j2580-0914.v4i4.10929

Abstract

The free span that occurs in the subsea pipeline can cause fatigue due to vortex induced vibration and local buckling. From the risk of failure that may occur, a risk-based inspection scheduling required. The 14" Underwater pipe belongs to PT. The X located in the Madura Strait is used to transmit gas from the CPP to ORF with a length of 65 km which has 554 free spans. In scheduling inspections, the commonly used codes are API RP 580 and DNV RP F116. This journal will discuss the difference between these two codes. Reliability calculations use Monte Carlo simulation with VIV failure mode and local buckling failure mode. The consequences of failure are reviewed on safety, environmental and asset aspects. API RP 580, shows the environmental aspect and the safety aspect of both modes of failure has the next inspection in 6 years, while the asset aspect is 3 years. At DNV RP F116, scheduling inspection of safety aspect on both modes is 3 years and environmental aspects is a year later, while the asset aspect would be better to change the pipe
Scheduling and Network Analysis on Cooling Water Pipe Fabrication Project Silvianita Silvianita; Daniel Mohammad Rosyid; Ekky Rizky
International Journal of Offshore and Coastal Engineering Vol. 6 No. 1 (2022)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v6i1.14554

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.
Co-Authors Abdul Azhim Abizar Giffari Akabrito Amsal Dewa Saujana Arif Windiargo Aufar Syahmi Faris Sumardi Brigitta Violyna El Tito Budi Setiawan Carlo Jonathan Sihombing Dewinta Putri Cahyaningtyas Ekky Rizky Eko Budi Djatmiko Garry Raditya Putra Hafizh Muhammad Naufal Shidqi Haryo Dwito Armono Iftinaniffah Qonitah Kurniati, Nani Madea Eka Silfiani Mahmud Mustain Mas Roro Lilik Ekowanti Maulinna Kusumo Wardhani, Maulinna Kusumo Muhammad Yusuf Jamil Murdjito Murdjito Murdjito Prastianto Nur Syahroni Raditya Danu Riyanto Rochani, Imam Rudi Walujo Prastianto Sambodho, Kriyo Silvianita Silvianita Sri Sumardiani Sujantoko Sujantoko Wahyudi Citrosiswoyo Wisnu Wardhana Yeyes Mulyadi Yoyok Setyo Hadiwidodo