Analisis Dampak Variasi Kedalaman Air Terhadap Performa Calm Buoy Untuk Kondisi Perairan Dangkal

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. ======================================================================================================== 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 > 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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