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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.
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 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 Sri Sumardiani Sujantoko Sujantoko Wahyudi Citrosiswoyo Wisnu Wardhana Yeyes Mulyadi Yoyok Setyo Hadiwidodo