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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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Journal : IPTEK The Journal for Technology and Science

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Fatigue Life of Mooring Lines on External Turret Floating LNG for Different Pretension and Water Depth Norman Mahdar Sabana; Eko Budi Djatmiko; Rudi Walujo Prastianto
IPTEK The Journal for Technology and Science Vol 30, No 1 (2019)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (651.295 KB) | DOI: 10.12962/j20882033.v30i1.5009

Abstract

This paper studies fatigue life of mooring lines applied on turret-moored Floating LNG (Liquefied Natural Gas). Several case studies were designed to investigate the influence of mooring pretension and water depth on the fatigue life of mooring lines. Floating LNG with permanent external turret mooring system consists of 12 catenary lines arranged in 3 group with 4 lines each. Time domain simulation applied to calculated coupled dynamic response and mooring tension. Fatigue life is assessed using rainflow counting method, T-N curves and Palmgren-Miner rule. Analysis results for mooring pretension case show that case study 2 with lowest pretension (14%MBL) yields shortest mooring fatigue life of 1814.20 years compared to case study 1 (18%MBL) and 3 (22%MBL) with 2034.61 years and 2983.33 years respectively. Despite has the lowest dynamic line tension, case study 2 has larger tension range that results in the increased of fatigue damage. The increase in water depth will increase the mooring line length and its weight, so it results in the increase of fatigue damage. This is reflected in case study 5 (903m water depth), which has shortest mooring fatigue life of 1842.65 years compare to case study 1 (602m water depth) and 4 (301m water depth) with 2983.33 years and 3363.62 years respectively.
Mooring Lines Reliability Analysis Case Study: Fso Abherka Garry Raditya Putra; Daniel Mohammad Rosyid; Rudi Walujo Prastianto
IPTEK The Journal for Technology and Science Vol 32, No 1 (2021)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v32i1.8628

Abstract

Floating Storage and Offloading (FSO) demands good designs. One of the design is FSO’s mooring lines. The mooring lines of the FSO would face various environmental conditions, so that they are required to have good reliability. FSO Abherka, installed in the Madura stratit, has dimensions of LOA 242.90 m, LPP 232 m, Breadth 41.6 m, Height 19.7 m, Draft 12,894 m, and a deadweight of 85829 tons. The strait has a water depth of 100 m with contour variations of ± 2 m. Each four cluster of mooring lines of FSO Abherka has three mooring ropes. This study analyzed the strength of mooring lines in intact and damaged conditions using DNV software Genie and DNV HydroD. This study models a hydrodynamic FSO. This study also measured the reliability of the mooring lines from 2 cases: 1 intact and one damage from the most dangerous conditions. This study used the mean Value First Order Second Moment method to find the reliability of these mooring lines. Based on the reliability calculation set by DNV according to DNV-OS E301, the mooring lines design meet the established reliability criteria
Co-Authors Abdul Azhim Agoes Pratikto Bagus Panuntun Brigitta Violyna El Tito 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 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 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 Murdjito, Murdjito Norman Mahdar Sabana Noviyanti, Irma Nur Syahroni Nur Syahroni Nurman Firdaus Firdaus Rachmadiarto, Fajar Rahmawati, Shade Rico Firdani Yuzri Rifki Mahardi Rizka Fajri Hamzah Rochani, Imam Rosyid, Daniel Mohammad Sambodho, Kriyo Shade Rahmawati Sholihin Sholihin, Sholihin Silvianita, Silvianita Sony Junianto Sri Sumardiani Sujantoko Sujantoko Syahroni, Nur Syarifuddin, Arief WAHYUDI Wimala Lalitya Dhanis Wisnu Wardhana Wisnu Wardhana Yeyes Mulyadi Yeyes Mulyadi Yoyok Setyo Hadiwidodo Yoyok Setyo Hadiwidodo Yusapril Hagie Syamsun Nahar Zikra, Muhammad