Aditia, Naufal Diaz (2017) Studi Analitis, Numerik dan Eksperimen Olah Gerak Struktur SPAR dan Dinamika Tegangan Sistem Tambat Tipe Taut Pada Kondisi Kegagalan Tali Tambat. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
SPAR (Single Point Anchor Reservoir) merupakan struktur lepas pantai berbentuk silinder
yang berfungsi untuk melakukan pengeboran, produksi, pemrosesan dan penyimpanan
minyak bumi. Untuk menjaga SPAR tetap pada posisi awal yang direncanakan, dibutuhkan
tali tambat yang dihubungkan ke jangkar dasar laut. Namun tingkat kegagalan sistem tali
tambat dari segala jenis industri cukup tinggi. Data menunjukan telah terjadi 107
kecelakaan dari tahun 1997 sampai dengan 2012. Pada penelitian ini akan dilakukan analisa
dinamika gerakan struktur dan tegangan tali yang terjadi ketika accidental limit state
dengan menggunakan tiga metode yaitu analitis, numerik dan eksperimen. Analisa kondisi
accidental pada penelitian ini menggunakan perangkat lunak OrcaFlex 9.2a. Kondisi
accidental di sini maksudnya kondisi di mana tali tambat terputus pada titik fairlead.
Terdapat kondisi accidental 1 dan accidental 2. Kondisi accidental 1 di mana line 1 terputus
didapatkan tegangan tertinggi terjadi pada line 4. Kemudian line 4 terputus karena tegangan
melebihi MBL, sehingga line 2 dan line 3 mengalami penurunan tegangan hingga menjadi
0 ton. Kondisi accidental 2 di mana line 2 diputus didapatkan hasil tegangan tertinggi
terjadi pada line 1 dengan nilai maksimum pada saat trancient sebesar 1354,70 ton dan saat
berada pada posisi kestabilan baru tegangan tali sebesar 862,92 ton.
==========================================================SPAR (Single Point Anchor Reservoir) is an offshore floating structure which has
cylindrical shape. SPAR has several functions that are drilling, production, processing and
as a storage of crude oil. SPAR needs mooring to stay on the designed position. But in the
last two decades, so many mooring accidents happened in this industry. There were 107
accidents from 1997 to 2012. Mooring accident leads the structure motion and the other
mooring line tension to unstable condition. In this research dynamical motion of the SPAR
and mooring tension due to accidental condition will be analyzed. There are three methods
will be used in this research to analyze free floating condition and tethered condition, they
are analitic, numeric and experiment. Analysis of mooring tension in the accidental
condition using sea-keeping software. Accidental condition in this research is condition
where one of the mooring line broken. There are two accidental conditions with different
broken line. When line 1 broken, tension of line 4 is bigger than the other lines. Afterward
tension of line 4 increase over MBL then line 4 collapsed, with the result that line 2 and 3
turn to loose that has no tension or 0 ton tension. In the condition where line 2 is broken,
line 1 has the biggest tension that is 1354,70 ton at transient and maximum tension at new
condition is 862,92 ton.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 627.23 Adi s |
| Uncontrolled Keywords: | SPAR, tension, mooring, accidental |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures V Naval Science > V Naval Science (General) |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Naufal Diaz Aditia |
| Date Deposited: | 31 Jan 2018 07:28 |
| Last Modified: | 08 Mar 2019 06:11 |
| URI: | http://repository.its.ac.id/id/eprint/45494 |
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