Studi Komparasi Perilaku Gerak Flng Masela Terhadap Internal Turret Mooring System Dan External Turret Mooring System

Daffa, Theolevi Rahman (2016) Studi Komparasi Perilaku Gerak Flng Masela Terhadap Internal Turret Mooring System Dan External Turret Mooring System. Undergraduate thesis, Institut Technology Sepuluh Nopember.

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Abstract

Turret mooring system merupakan sistem tambat yang sering digunakan untuk FLNG di perairan dalam. Tugas akhir ini membahas tentang studi komparasi perilaku gerak, offset, dan tension dari internal turret dan external turret. Analisa diawali dengan pemodelan FLNG menggunakan Hydrostar untuk mendapatkan model hull, dan RAO dalam keadaan free floating yang nantinya akan di input pada Ariane8, lalu pada Ariane8 dilakukan permodelan konfigurasi turret mooring 26m dibelakang FP dan didepan FP, setelah itu dilakukan analisa menggunakan time history domain selama 10800 detik untuk mendapatkan motion, tension dan offset. Diketahui untuk external turret non-collinear nilai tension signifikan terbesar terjadi di mooring lines 4 sebesar 2703,084 KN. Motion yang terjadi untuk mode gerakan roll sebesar (+) 3,978 deg, mode gerakan pitch (+) 0,217 deg, mode gerakan yaw (+) 46,688 deg. Nilai offset maksimum yang terjadi sebesar (-)385,844 m terhadap garis transversal dan sebesar (+)235,131 m terhadap garis longitudinal. Sementara nilai yang lebih kecil terjadi di konfigurasi internal turret non-collinear dimana nilai tension signifikan terbesar terjadi di mooring lines 4 sebesar 2075,015 KN. Motion yang terjadi untuk mode gerakan roll sebesar (+) 3,287 deg, mode gerakan pitch (+) 0,208 deg, mode gerakan yaw (+) 37,542 deg. Nilai offset maksimum yang terjadi sebesar (-)318,27 m terhadap garis transversal dan sebesar (+)193,984 m terhadap garis longitudinal. Kemudian dilakukan variasi jarak turret pada jarak 26m, 51,25m dan 71,75m dengan hasil nilai tension, offset dan motion external turret lebih signifikan dibandingkan internal turret di setiap variasi jarak. ======================================================================================================= Turret mooring is the most common system for mooring of FLNG. This final project discuss about comparative study of the behavior of motion, offset, and the tension of the internal turret mooring system and external turret mooring system. Analysis commenced with modeling FLNG using software Hydrostar to generate the hull model of FLNG, and RAO in free floating condition, which will be used as an input to software Ariane8 for further analysis. Ariane8 will be used for time history domain analysis of mooring system. The first stage of analysis on turret mooring system is modelled for 26m in front of FP and behind FP. The most significant tension for external turret mooring non-collinear is 2703.08 KN in line 4. The result of maximum value for external turret mooring are (+) 3.98 deg for roll motion, (+) 0.22 deg for pitch motion and (+) 37.54 deg for yaw motion. The maximum value for offset is (-) 385.84 m in transversal line and (+)235.13 m in longitudinal line. Whilst the smaller values occurred in the non-collinear internal turret mooring where the most significant tension is 2075,01 KN. The result of maximum value for internal turret mooring are (+) 3.29 deg for roll motion, (+) 0.21 deg for pitch motion and (+) 37.54 deg for yaw motion. The maximum value of offset is (-)318.27m in transversal line and (+)193.98 m in longitudinal line. Analysis is performed distance variation of the turret, at a distance of 26m, 51.25m and 71.75m from FP.These show the results of tension, offset and external turret motion are more significant than the internal turret at any distance variation.

Item Type: Thesis (Undergraduate)
Additional Information: RSKe 627.98 Daf s-
Uncontrolled Keywords: Turret mooring system, tension, motion, offset
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 25 Feb 2020 04:34
Last Modified: 25 Feb 2020 04:34
URI: http://repository.its.ac.id/id/eprint/75159

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