PERENCANAAN SPREAD MOORING FSO BARAKUDA NATUNA
Spread Mooring Design FSO Brakuda Natuna
Alexandra Ayurinaras Darminto 1 dan Ir. Krisnaldi Idris, Ph.D. 2
Program Studi Teknik Kelautan
Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung,
Jl. Ganesha 10 Bandung 40132
alexandra.a.darminto@gmail.com 1 dan krisnaldi2@gmail.com 2
Abstract: FSO (Floating Storage and Offloading) is a floating structure built to accommodate crude oil obtained from offshore oil and gas mining activities. In the process of delivering oil from the platform, the FSO is expected to be in a stable position with minimum movement due to environmental factors, therefore an FSO mooring system is required. An anchor mooring system is not an option due to the large number of pipelines laid around the platform and the FSO, so mooring is the best option in this case. Based on the processing of environmental data around the Natuna Sea area, it is known that there are dominant wind, wave, and current directions, so a spread mooring system is chosen with the FSO heading to the northeast where the largest combination of wind, waves and currents occurs. The mooring chain used will experience a reduction in diameter due to corrosion by sea water so that it is necessary to monitor it regularly to avoid breaking the mooring chain. In this final project, an analysis will be carried out regarding the strength of the spread mooring that occurs and the allowed thickness of the mooring chain to avoid breaking the mooring rope. The analysis in this case will be carried out in ballast and full load conditions and begins with the modeling of the FSO structure in the operator response amplitude (RAO) software, which aims to determine the response of the structure to working natural factors. Then the output of the modeling will be tested for accuracy in accordance with the provisions of IACS. After the accuracy of the modeling has been tested to meet the standards, the structural response become an input for the mooring system modeling software. This modeling is carried out in two conditions, ultimate limit state and accidental limit state, for each condition, ballast and full load. Then the results of modeling in this software will be evaluated in accordance with the minimum standards listed in API-RP-2SK. The final result of the structural response analysis is that the structure can experience resonance at low frequency waves, and the response of the FSO structure to natural factors affects the tension generated along the mooring rope, as has been modeled, it is known that the greatest tension that occurs is 2,098 kN which occurs in mooring. line 6 for ballast conditions when ALS is on regular waves, while for random waves it is 4,971 kN which occurs on mooring line 6 for ballast conditions when ALS.
Keywords: FSO, mooring analysis, mooring tension, time-domain simulation.
Loading...
Reload document 
Open in new tab