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All Journal Rotasi Jurnal Teknik ITS IPTEK Journal of Proceedings Series IPTEK The Journal for Technology and Science REKAYASA Jurnal Teknik Sipil Adi Widya : Jurnal Pengabdian Masyarakat IJOCE (International Journal of Offshore and Coastal Engineering) Wave: Jurnal Ilmiah Teknologi Maritim International Journal of Marine Engineering Innovation and Research Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Sewagati
Rudi Walujo Prastianto
Departemen Of Ocean Engineering, Faculty Of Marine Technology, Institut Teknologi Sepuluh Nopember
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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Fatigue Life Analysis of FSO Anchor Chain with Corrosion Effect Dewinta Putri Cahyaningtyas; Nur Syahroni; Rudi Walujo Prastianto; Eko Budi Djatmiko; Murdjito Djatmiko; Hafizh Muhammad Naufal Shidqi
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.v8i2.5460

Abstract

In this study, the authors analyze the fatigue life of the anchor chain used to secure the Gamkonora FSO to the seabed. The objective is to determine the operational lifespan of the anchor chain by considering its fatigue life. The research begins with an analysis of the movement of the Gamkonora FSO under environmental loads in both free-floating and moored conditions to determine the tension in each anchor chain. Next, the anchor chain tension is calculated for various corrosion levels, namely 0%, 5%, 10% and 15%. Subsequently, the tension range and damage ratio values are determined using the T-N curve method based on Palmgren Miner’s failure law, with failure estimation carried out using the rainflow counting method. The numerical modeling results reveal that the largest translational motion behavior of the FSO occurs during heave motion, reaching 1.409 m/m, while the largest rotational motion is observed during roll motion, with a value of 3.463 deg/m when the FSO is fully loaded. The maximum tension recorded in the anchor chain is 1,695.14 kN at heading 90° under 0% corrosion conditions, with a safety factor of 4.53. Furthermore, the cumulative damage value from the T-N curve is obtained, with the largest value recorded as 0.0702. Based on the cumulative damage, the fatigue life of the anchor chain is estimated to be 14.25 years during its operational lifespan.
Numerical Analysis on The Effect of Barge Motion to Jacket Lifting Process During Decommissioning Murdjito; Vebby Akbar Kurniawan; Raditya Danu Riyanto; Rudi Walujo Prastianto
International Journal of Marine Engineering Innovation and Research Vol. 8 No. 1 (2023)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i1.5526

Abstract

Offshore structure decommissioning is mandatory when an offshore oil and gas platform reaches the end of its service life. There are no less than 450 fixed offshore steel structures in Southeast Asia, and by 2030, more than 200 offshore fields will be terminated and need to be decommissioned. From an operational aspect, the decommissioning process is simply an inverse of installation. However, due to the structures' age and the uncertainties of the structural performance, the simple operation can be an obfuscating process. This paper discusses one of the most crucial processes during decommissioning: lifting. The dynamic performance of a lifted jacket in several rigging variations is investigated. We use a standard stern crane HLV (Heavy Lift Vessel) to simulate the process, with several wave attack angles. Sea condition is according to DNVGL benign wave during marine operation, with random waves generated using the JONSWAP spectrum. Coupled dynamics of HLV and jacket motion are analyzed.
Fatigue Life Comparison of Modified and Conventional 3 Leg Jacket Offshore Structure Murdjito Murdjito; Muhammad Nabil Ghiffary; Rudi Walujo Prastianto
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.v4i2.9306

Abstract

The jacket structure must be adapted to the conditions of the production field to support economic factors. So, the concept of a modular platform for minimal, low-cost facilities is adopted. However, the design differences will affect the performance of the jacket itself, in other words a modular jacket can withstand the same load as a conventional jacket model but has a different structural performance. Therefore, this research discusses the performance comparison, which includes the fatigue life and the natural period, between conventional and modular jacket structures, which in this study are referred to as modified jackets. Conventional jacket as a comparison structure takes the design basis of the modified structure, including the same structural profiles, and environmental loads. In this study, the two jackets will only be modeled on the jacket part and the superstructure will be modeled as a joint load on the three upper ends of the jacket legs. Fatigue life analysis in this study used the full spectral analysis method. By using SACS software, the natural period of modified jacket is 1.756 s and conventional jacket is 1.472 s. While the lowest fatigue life on modified jacket is 44.98 years and conventional jacket is 9125.79 years.
Local Analysis of The Padeye-Brace Clamp Structure Strength during Installation of Riser-Spool at Offshore Platform Rudi Walujo Prastianto; Yusapril Hagie Syamsun Nahar; Yoyok Setyo Hadiwidodo
International Journal of Offshore and Coastal Engineering Vol. 7 No. 2 (2023)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v7i2.2366

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.
Analysis of Sling Tension on the Lifting Process of Riser Support Jacket on Installation Phase Rifki Mahardi; Yoyok Setyo Hadiwidodo; Rudi Walujo Prastianto
International Journal of Offshore and Coastal Engineering Vol. 8 No. 1 (2024)
Publisher : Department of Ocean Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v8i1.20463

Abstract

The increasing exploration and exploitation of oil and gas in the deep sea has led to an increasing need for new technologies to support these activities. In this study, a riser support structure in the form of a jacket is used to support the riser so that the stress can be minimized. Like the jacket structure in general, this riser support structure can be installed using various methods, including the lifting method. This study discusses the stress in the sling when the lifting process is carried out. The crane barge used in this study was first modeled using MOSES Software to determine how the barge moves when the lifting process is carried out. The result of the barge movement analysis is a Response Amplitude Operator (RAO). In the sway, heave and roll movements, it is known that the maximum value is at 90° heading, while in other movements, it varies. The riser support structure is modeled using SACS Software to determine the center of gravity, then the sling length is calculated. From the calculation, the sling length at lifting point 1 is 34,10 m, lifting point 2 is 34,14 m, lifting point 3 is 36,08 m, and lifting point 4 is 36,10 m. The lifting model is input into the OrcaFlex Software to analyze the sling stress. The analysis was performed in five loading directions, namely 0°, 45°, 90°, 135°, and 180°. The maximum stress occurs in the loading direction of 90°, with the result that sling 1 is 1932,70 kN, sling 2 is 1905,65 kN, sling 3 is 1161,64, and sling 4 is 1193,65 kN.
Co-Authors Abdul Azhim Agoes Pratikto Bagus Panuntun Brigitta Violyna El Tito Budi Setiawan Daniel Muhammad Rosyid Dendy Satrio Dewinta Putri Cahyaningtyas Dhanis, Wimala Lalitya Dyah Ayu Puspitorini Eko Budi Djatmiko Garry Raditya Putra Gde Pradnyana Sutha Gde Pradnyana Sutha, Gde Pradnyana Hadiwidodo, Yoyok Setyo Hadiwidodo, Yoyok Setyo Hafizh Muhammad Naufal Shidqi Hafshah, Nailatul Fadhilah Handayanu Handayanu Handayanu Haryo Dwito Armono Hasan Ikhwani Herman Pratikno, Herman Imam Rochani Kriyo Sambodho Kriyo Sambodho Kurniati, Nani Kurniawan, Ilham Madea Eka Silfiani Mahmud Mustain Maulinna Kusumo Wardhani, Maulinna Kusumo Miftakh D.S, Dwi Purnomo H, Zuhud Ubaidillah & Muhammad Fajariansyah Ismail Muhammad Nabil Ghiffary Muhammad Zikra Mukhtasor Mukhtasor Mukhtasor, Mukhtasor Mulyadi, Yeyes Murdjito Murdjito Murdjito Djatmiko Murdjito Murdjito Murdjito Murdjito Murdjito Prastianto Murdjito, Murdjito Nahar, Yusapril Hagie Syamsun Norman Mahdar Sabana Noviyanti, Irma Nur Syahroni Nur Syahroni Nurman Firdaus Firdaus Rachmadiarto, Fajar Raditya Danu Riyanto Rahmawati, Shade Rico Firdani Yuzri Rifki Mahardi Rifki Mahardi Rizka Fajri Hamzah Rochani, Imam Rosyid, Daniel Mohammad Rosyid, Daniel Mohammad Sambodho, Kriyo Shade Rahmawati Sholihin Sholihin, Sholihin Silvianita, Silvianita Sony Junianto Sri Sumardiani Sujantoko Sujantoko Syahroni, Nur Syarifuddin, Arief Tito, Brigitta Violyna El Vebby Akbar Kurniawan WAHYUDI Wimala Lalitya Dhanis Wisnu Wardhana Wisnu Wardhana Yeyes Mulyadi Yeyes Mulyadi Yoyok Setyo Hadiwidodo Yoyok Setyo Hadiwidodo Yusapril Hagie Syamsun Nahar Zikra, Muhammad