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ITS » Undergraduate Theses » Fisika
Posted by dewi007 at 30/10/2008 16:44:05  •  16006 Views


ANALISA KEKUATAN SPREAD MOORING AKIBAT MOTION PADA FPSO BERBASIS TIME DOMAIN

STRENGTH ANALYSIS ON SPREAD MOORING SYSTEM DUE TO INFLUENCE OF FPSO MOTION BASED ON A TIME DOMAIN SIMULATION

Created by :
Rozak, Abdul 



SubjectKapal
model
kapal
jangkar
KeywordFPSO
mooring system
safety factor
excursion
ULS
transient
steady

Description:

Floating Production Storage and Offloading (FPSO) adalah fasilitas terapung untuk produksi dan penyimpanan sementara minyak dan gas bumi berbentuk kapal yang secara permanen ditambatkan di lokasi operasi. Sistem tambat menyebar (spread mooring system) merupakan salah satu mooring system yang digunakan untuk meredam gerakan dinamis pada FPSO akibat beban lingkungan. Tugas akhir ini melakukan analisa terhadap karakteristik gerakan FPSO dengan spread mooring system. Tension maksimum pada chain line dan excursion FPSO menggunakan software MOSES ver.6.0. Dari hasil penelitian yang dilakukan terhadap FPSO 140 KDWT kondisi moored, dapat diambil kesimpulan bahwa mooring system dengan konfigurasi 12 chain line (φ = 117 mm) merupakan mooring system yang paling sesuai untuk digunakan pada FPSO yang mengalami kondisi pembebanan ultimate limit state (ULS) paling ekstrem. Gerakan ekstrem yang paling mungkin terjadi untuk surge, sway dan yaw adalah sebesar 0.554 m, 1.898 m dan 0.840 deg. Masing-masing terjadi pada heading 45o, 90o dan 135o. Excursion maksimum untuk kondisi transient pada heading 180o sebesar 5.52 m arah X dan 0.02 m arah Y dan excursion maksimum untuk kondisi steady pada heading 180o sebesar 4.57 m arah X dan 0.00 m arah Y. Excursion tersebut tidak melampaui persyaratan fungsionalnya, yaitu sebesar 20% kedalaman perairan. Pada kondisi transient, tension rata-rata terbesar adalah 75.5 ton dan tension signifikan terbesar adalah 123.5 ton yang terjadi pada chain line no 1 heading 180o. Sedangkan untuk kondisi steady, tension rata-rata terbesar adalah 65.75 ton terjadi pada chain line no 12 untuk heading 45o dan tension signifikan terbesar adalah 81.5 ton terjadi pada chain line no 8 untuk heading 135o. Harga safety factor (SF) terkecil 1.86 untuk kondisi transient dan 7.80 untuk kondisi steady. Menurut API RP 2SK 2nd edition, SF minimal untuk kondisi ULS adalah 1.67, sehingga dapat disimpulkan bahwa chain line (φ = 117 mm) aman untuk digunakan sebagai mooring system.


Alt. Description

Floating Production Storage and Offloading (FPSO) is a floating facility for producing and temporarily storage oil and/or gas, which is permanently moored in the field. Spread mooring system is one of the alternatives to reduce the dynamic motion of FPSO due to environmental loads. This final project is aimed at analyzing the characteristic of FPSO motion with spread mooring system. Maximum tension at the chain line and the excursion of FPSO were identified using analytical software MOSES ver.6.0. From the investigation on a moored 140 KDWT FPSO, it can be concluded that mooring system with configuration of 12 chain line (φ = 117 mm) is the most suitable mooring system to withstand the extreme loading condition under ultimate limit state (ULS) criteria. The extreme motion that has the largest possibility of occurrence for surge, sway and yaw are 0.554 m, 1.898 m and 0.840 deg due to the wave heading of 45o, 90o and 135o. Respectively, maximum excursion at transient condition was found to occur at wave heading 180o for value 5.52 m in X direction and 0.02 m in Y direction, while in steady condition will occurs in wave heading of 180o with the value 4.57 m in X direction and 0.00 m in Y direction. The criteria of maximum excursion for functional requirement should be less than 20% of water depth, so the excursion of the current FPSO within the allowable limit. For transient condition, maximum mean tension is 75.5 ton and maximum significant tension is 123.5 ton which occurred at the chain line number 1 for wave heading of 180 o. For steady condition, maximum mean tension is 65.75 ton at the chain line number 12 for wave heading of 45o and maximum significant tension is 81.5 ton on chain line number 8 for wave heading of 135o. The lowest safety factor (SF) is 1.86 for transient and 7.80 for steady condition. According to API RP 2SK 2nd edition, minimum SF for ULS condition is 1.67, therefore it can be concluded that the chain line (φ = 117 mm) is safe to be applied for the mooring system.

Contributor:
  1. Dr. Ir. Eko Budi Djatmiko, M.Sc.
    Ir. Murdjito, M.Sc, Eng.
Date Create:30/10/2008
Type:Text
Format:pdf.
Language:Indonesian
Identifier:ITS-Undergraduate-3100007030404
Collection ID:3100007030404
Call Number:RSKe 627.32 Roz a


Source :
Ocean Engineering, RSKe 627.32 Roz a, 2007

Coverage :
ITS Community Only

Rights :
Copyright @2007 by ITS Library. This publication is protected by copyright and permission should be obtained from the ITS Library prior to any prohibited reproduction, storage in a retrievel system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to ITS Library


Publication URL :
http://digilib.its.ac.id/analisa-kekuatan-spread-mooring-akibat-motionpada-fpso-berbasis-time-domain-2107.html




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