Wibowo, Rizki Kresna (2016) Analisis Dampak Variasi Kedalaman Air Terhadap Performa Calm Buoy Untuk Kondisi Perairan Dangkal. Undergraduate thesis, Institut Teknology Sepuluh Nopember.
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Abstract
SPM CALM Buoy merupakan sebuah sarana tertambat lepas pantai untuk
melakukan proses loading/unloading minyak mentah untuk didistribusikan. SPM
CALM Buoy di Indonesia banyak dioperasikan pada perairan dangkal sebagai
penghubung antara kapal tanker dengan terminal transit yang ada di darat.
Karakteristik perairan dangkal yang berbeda dengan perairan menengah maupun
perairan dalam menyebabkan perlunya dilakukan analisis tentang dampak variasi
kedalaman terhadap performa CALM Buoy. Hasil analisa gerakan kapal kondisi
free floating pada kondisi gelombang reguler maupun spektra respon
menunjukkan gerakan surge, sway dan yaw dipengaruhi oleh variasi kedalaman,
sedangkan heave, roll dan pitch dipengaruhi frekuensi. Untuk CALM Buoy, semua
gerakan dipengaruhi oleh variasi kedalaman. Hasil analisa kondisi tertambat,
diketahui bahwa tension pada mooring line dan offset pada CALM Buoy
dipengaruhi oleh variasi kedalaman dan tidak terpengaruh oleh gaya dari tarikan
kapal. Semakin dalam wilayah perairan, nilai tension dan offset semakin besar.
Pada kedalaman 21 m hingga 42 m menggunakan pre-tension sebesar 10% dari
MBL, sedangkan pada kedalaman 50 m menggunakan pre-tension 15% dari MBL
karena pre-tension awal yang sebesar 10% sudah tidak mampu mengakomodasi
gerakan dari CALM Buoy. Hal ini dikarenakan beban gelombang second order
lebih berpengaruh pada struktur tertambat seperti CALM Buoy.
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SPM CALM Buoy is an offshore structure operated to aid loading / unloading
crude oil to be distributed. In Indonesia, SPM CALM Buoy was operated in
shallow water to bridge between the tanker to transit to fuel terminal on shore.
The differences of characteristic for shallow water intermediate and deep water
direct to the need for analysis of the impact of depth water variation te the
performance of CALM Buoy. Results of motion analysis on ship in free floating
condition in regular and random wave shows the surge, sway and yaw are
influenced by depth variation, while heave, roll and pitch influenced by wave
frequencies. For CALM Buoy, all mode of motion are influenced by the depth
variation. Result of analysis for moored condition, indicated that the tension on
the mooring line and offset at CALM Buoy influenced by variation in depth and is
not affected by tension from the vessel. The deeper the waters, the value of
tension and offset are greater. At a depth of 21 m to 42 m the Pre-tension 10% of
MBL is used, whereas at a depth of 50 m Pre-tension 15% of MBL is used,
because for initial pre-tension by 10% MBL is not able to accommodate the
motion of CALM Buoy. It is found that the load of the second order wave have
more influence on the moored structure like CALM Buoy.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 627.924 Wib a |
| Uncontrolled Keywords: | CALM Buoy, offset, perairan dangkal, second order, tension. |
| Subjects: | L Education > LB Theory and practice of education > LB1029.S53 Educational games. Simulation methods |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 26 Dec 2019 02:18 |
| Last Modified: | 26 Dec 2019 02:18 |
| URI: | http://repository.its.ac.id/id/eprint/72470 |
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