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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.
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 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 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 Zikra, Muhammad