Wardana, Adam Wisnu (2016) Analisis Kekuatan Struktur Pondasi Winch Roller Streamer Pada Kapal Survei Sesmik. Undergraduate thesis, Institut Teknology Sepuluh Nopember.
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Abstract
Dalam proses explorasi migas diperlukan survei seismik untuk mengetahui posisi
kandungan migas potensial sehingga menghemat tenaga, waktu dan biaya operasi.
Dalam proses survei sesmik, kapal seismik menarik berbagai macam peralatan seismik
yang terbentang diatas laut dengan kecepatan laju 5 knot. Interaksi hidrodinamis antara
peralatan seismik dengan kondisi lingkungan menyebabkan gaya tarik terhadap
peralatan deck. Gaya tarik yang muncul ini terhubung pada roller streamer yang
ditahan oleh sepasang pilar dan girder penahan dan dihubungkan ke main deck
menggunakan pondasi berupa bracket. Untuk mendapatkan gaya tarik streamer maka
dilakukan analisis dengan memasukan berbagai parameter seperti response amplitude
operator (RAO), konfigurasi operasi survei, dan juga kondisi lingkungan. Gaya tarik
terbesar timbul pada arah pembebanan head seas (180o) yaitu pada line streamer no 4
sebesar 437.71 KN. Kemudian gaya tarik yang didapat digunakan untuk pembebanan
pada konstruksi winch roller streamer. Pada tahap akhir dilakukan analisis lokal pada
struktur pondasi bracket untuk mendapatkan tegangan von mises maksimum dan
deformasi yang terjadi. Hasil dari analisis ini didapatkan tegangan von mises
maksimum 44.312 MPa dan deformasi sebesar 0.06 mm pada pondasi bracket. Setelah
didapat nilai tegangan yang terjadi kemudian dilakukan pengecekan kekuatan terhadap
yield strength materialnya. Kriteria aman diambil dari DNV yakni dengan
menambahkan load design factor sebesar 1.1 dari tegangan yang terjadi. Berdasarkan
kriteria tersebut dapat dikatakan bahwa struktur pondasi bracket dari winch roller
streamer aman atau kuat saat beroperasi.
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In the process of oil and gas exploration, seismic survey is required to determine the
position of a potential oil and gas content, so it saves labor, time and operating costs.
In the process of seismic surveys, seismic vessel tow a wide range of seismic equipment
laying on water sea level with 5 knots speed. Hydrodynamic interactions between
seismic equipment and environmental conditions cause tension on deck equipment.
Tension arising relies on a roller streamer holded by a couple of coloum and girder
connected to the main deck to the structure of the foundation in the form of a bracket.
To get the tension streamer, then an analysis should be performed by entering various
parameters such as Response Amplitude Operator (RAO), the configuration of survey
operation, and the environmental conditions. The maximum tension arises in the
direction of loading head seas (180o) on line streamer no 4, 437.71 KN. Tension from
previous analysis used for loading condition on winch roller streamer structure. In the
final stages performed a local analysis on the winch roller streamer to get the maximum
von mises stress and deformation. The results of this analysis is maximum von mises
44.312 MPa at bracket foundation and deformation 0.36 mm at the top of roller. A
strength check of structure is performed against the yield strength. Safety criteria taken
from DNV by adding load factor of 1.1 from the actual stress. According to these
criteria can be said that the foundation structure winch roller streamer safe or strong
during operation.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 624.177 65 War a |
| Uncontrolled Keywords: | Streamer, Survei seismik, Winch roller |
| 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: | 29 Jan 2020 02:23 |
| Last Modified: | 29 Jan 2020 02:23 |
| URI: | http://repository.its.ac.id/id/eprint/73613 |
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