Analisis Tegangan Tali Tambat Akibat Pengaruh Ketidak Sejajaran (Non-Alignment) Konfigurasi Sistem Tambat

Budiman, Arief (2022) Analisis Tegangan Tali Tambat Akibat Pengaruh Ketidak Sejajaran (Non-Alignment) Konfigurasi Sistem Tambat. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Floating Storage Offloading (FSO) merupakan struktur terapung yang memilikikemampuan
untuk penyimpanan hidrokarbon. Pada kondisi operasi, FSO membutuhkan sistem tambat
untuk menjaganya agar tetap stabil pada posisinya. Salah satu yang umum digunakan adalah
Single Point Mooring (SPM). Diperlukan analisis terhadap sistem tambat untuk mengetahui
kekuatan sistem tambat tersebut sehingga operasi di lepas pantai dapat berjalan dengan
aman. Dalam penelitian tugas akhir ini, dilakukan analisis kekuatan chain stopper pada SPM
dengan dua konfigurasi sistem tambat. Hal ini dilakukan karena pergantian SPM dari sitem
4 stopper ke 6 stopper dengan posisi anchor chain yang sama. Dengan mengetahui perilaku
gerak dari SPM dan FSO akibat beban lingkungan pada kondisi free floating, maka akan
diketahui nilai tension dari mooring lines pada beberapa variasi pembebanan. Nilai RAO
pada FSO dan SPM cenderung mengalami kondisi maksimal pada kondisi full load ketika
mode gerakan roll saat arah datang gelombang dari beam sea (90⁰) serta frekuensi sebesar
0.57 rad/s. Hasil analisis untuk hasil tension pada chain stopper yang tidak sejajar sebesar
1589.68 kN pada konfigurasi 1, dan 2518.67 kN pada konfigurasi 2. Besar tegangan
maksimum (Von-Mises stress) dan deformasi pada chain stopper dengan konfigurasi 1
sebesar 259.82 MPa, dan 0.32 mm, sedangkan pada konfigurasi 2 sebesar 373.06 MPa, dan
0.33mm. Secara umum, nilai tension, tegangan von-mises, dan deformasi yang terjadi pada
konfigurasi 1 lebih kecil daripada konfigurasi 2.
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Floating Storage Offloading (FSO) is a floating structure that has the ability to store
hydrocarbons. Under operating conditions, the FSO requires a mooring system to keep it
stable in its position. One that is commonly used is Single Point Mooring (SPM). An analysis
of the mooring system is needed to determine the strength of the mooring system so that
offshore operations can run safely. In this final project, an analysis of the strength of the
chain stopper on SPM with two mooring system configurations is carried out. This was done
because the SPM was changed from a 4 stopper system to a 6 stopper with the same anchor
chain position. By knowing the motion behavior of SPM and FSO due to environmental
loads in free floating conditions, it will be known the value of the tension of the mooring
lines in several variations of loading. RAO values on FSO and SPM tend to experience
maximum conditions at full load conditions when the roll movement mode is in the direction
of the incoming wave from the beam sea (90⁰) and the frequency is 0.57 rad/s. The results of
the analysis for the results of tension on the chain stopper that are not parallel are 1589.68
kN in configuration 1, and 2518.67 kN in configuration 2. The maximum stress (Von-Mises
stress) and deformation on the chain stopper with configuration 1 is 259.82 MPa, and 0.32
mm, while the configuration 2 is 373.06 MPa, and 0.33mm. In general, the values of tension,
von-mises stress, and deformation that occur in configuration 1 are smaller than
configuration 2.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Chain stopper, single point moorin, Floating Storage and Offloading, Response Amplitude Operator, Tension, Von-mises Stress,
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM761 Stability of ships
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Arief Budiman
Date Deposited:	04 Feb 2022 03:35
Last Modified:	31 Oct 2022 02:24
URI:	http://repository.its.ac.id/id/eprint/92667

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