Analysis Of The Effect Of Mooring Configuration Variations On The Tension Mooring In Determining The Operating Limits When Flng Moored To A Jetty

Zein, Indah Aqnaita Tidar Yasmin (2021) Analysis Of The Effect Of Mooring Configuration Variations On The Tension Mooring In Determining The Operating Limits When Flng Moored To A Jetty. Undergraduate thesis, Institut teknologi Sepuluh Nopember.

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Abstract

Oil and gas exploration is mostly carried out offshore. So, it makes more efficient transportation for further processing of oil and gas on land, so FLNG is used as an effective and efficient means of transportation. To maintain and restrain the movement of FLNG during offloading, that it remains in a stable condition, it is necessary to build a mooring system facility. The methodology used includes literature studies and numerical modeling using software like Maxsurf, MOSES, and OrcaFlex.
In this final project, an analysis of FLNG mooring moored to a jetty with many waves conditions, there are 1-year, 100 years, and 1-year waves with swell effect. The variations used in this analysis are 3 different mooring configurations, 2-3-1, 3-3-2, and 4-4-3. The model will be analyzed with 4 load cases in each environmental condition, there is an light load without ballast, an light load with ballast, a full load without ballast, and a full load with ballast. Every model with a different scenario, will be entered into three environmental conditions with the same 5 loading directions, namely 0̊, 45̊, 90̊, 135̊, and 180̊. The highest motion response of the vessel will be continued with the analysis by entering 3 loading directions, 225o, 270o, and 315o.
The results of the mooring tension analysis can be solved by the time-domain method. It shows that the individual maximum tension value in each ship loading scenario and all environmental conditions have met the OCIMF safety factor criteria with no less than 2. Of all the analysis results, the most distinguished individual maximum tension value occurs at the direction of 90o environmental load in 100-years wave environment conditions, with full load condition without ballast 2-3-1 configuration. All simulated mooring configuration models have a tension value that is sufficient for safe operating limits in all load condition scenarios and environmental conditions, taking into account safe operating limits, as well as faster installations, the more effective configuration to use is the 2-3-1 configuration. Meanwhile, the simulation results in the loading direction of 225o, 270o, and 315o show that the reflection wave produces a very small tension value compared to the tension value caused by the incident wave. It means the reflection wave has not impact on mooring system design.
Keywords: FLNG, Mooring System, Jetty, Tension

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Batas Operasi, Jetty, Sistem Tambat, Tension FLNG, Mooring System, Jetty, Tension
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures V Naval Science > VK > VK361 Mooring of ships. Dry docks
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Indah Aqnaita Tidar Yasmin Zein
Date Deposited:	08 Aug 2021 16:22
Last Modified:	08 Aug 2021 16:22
URI:	http://repository.its.ac.id/id/eprint/85135

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