Analisis Keandalan Kekuatan Sistem Tambat Single Point Mooring Dengan Modifikasi Konfigurasi Pada Mooring Line

Silfiani, Madea Eka (2024) Analisis Keandalan Kekuatan Sistem Tambat Single Point Mooring Dengan Modifikasi Konfigurasi Pada Mooring Line. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pengangkutan produk minyak bumi dari Tanker ke terminal akhir dilakukan melalui pipa dan terminal minyak. Jenis terminal yang paling umum adalah Single Point Mooring (SPM). Single Point Mooring (SPM) dapat menambat Tanker dan menyalurkan minyak bumi dari tanker melalui floating hose yang tersambung dengan SPM dan kemudian disalurkan ke darat melalui pipa bawah laut. Struktur Single Point Mooring (SPM) dalam masa operasinya selalu dilakukan inspeksi berkala. Struktur Single Point Mooring (SPM) milik Pertamina adalah salah satunya. Pada saat dilakukan inspeksi, SPM 17.500 DWT dinyatakan harus segera dilakukan overhaul. Agar operasi loading-unoading bahan bakar minyak tetap berjalan, maka dibutuhkan SPM pengganti. SPM pengganti yang digunakan adalah SPM 150.000 DWT Pertamina. SPM 17.500 DWT selama masa operasinya ditambat dengan 6 mooring line dengan diameter 63,5 mm, sedangkan SPM 150.000 DWT ditambat dengan 4 mooring line berdiameter 135 mm. Karena perbedaan jumlah mooring line dan diameter mooring line tersebut, diperlukan modifikasi konfigurasi dari 6 mooring line ke 4 mooring line. Modifikasi yang dilakukan adalah dengan menggabungkan mooring line existing (63,5 mm) dengan mooring line baru (135 mm) yang disambungkan dengan triangle plate. Dalam tesis ini menganalisis keandalan modifikasi konfigurasi mooring system, yaitu komponen mooring line, triangle plate, dan chain stopper dengan variasi peletakan triangle plate pada mooring line. Metode yang digunakan dalan analisis keandalan yaitu, Mean Value First Order Second Moment (MVFOSM). Dari hasil penelitian didapatkan bahwa konfigurasi mooring system memenuhi kriteria API RP 2SK, baik pada kondisi Intact maupun damaged. Hasil dari analisis tegangan lokal pada triangle plate dan chain stopper juga memenuhi allowable stress. Analisis keandalan untuk kondisi intact dan damaged pada semua pembebanan menunjukkan bahwa konfigurasi paling handal pada mooring line dengan posisi triangle plate 26 m, dilanjutkan dengan 31 m, dan terakhir di posisi 36 m dengan keandalan 0,990398295 pada kondisi intact dan 0,966042213 pada kondisi damaged.
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Transportation of crude oil products from tankers to final terminals is carried out through pipelines and oil terminals. The most common type of terminal is Single Point Mooring (SPM). Single Point Mooring (SPM) can moor tankers and connected crude oil from the tanker via floating hoses to the SPM and then distribute it to terminal via underwater pipes. The Single Point Mooring (SPM) structure is always inspected periodically during its operational period. Pertamina's Single Point Mooring (SPM) structure is one of them. During the inspection, it was stated that the SPM 17,500 DWT needed to be overhauled immediately. In order to continue loading and unloading operations of crude oil, a replacement SPM is needed. The replacement SPM used is Pertamina's SPM 150,000 DWT. During its operational period, the SPM 17,500 DWT was moored with 6 mooring lines with a diameter of 63.5 mm, while the SPM 150,000 DWT was moored with 4 mooring lines with a diameter of 135 mm. Due to differences in the number of mooring lines and mooring lines diameters, it is necessary to modify the configuration from 6 mooring lines to 4 mooring lines. The modification made was by combining the existing mooring lines (63.5 mm) with a new mooring lines (135 mm) which was connected to a triangle plate. In this thesis, a reliability analysis of the modification of the mooring system configuration, namely mooring line, triangle plates and chain stopper with variations in the placement of the triangle plates on the mooring line. The method used in analysis is Mean Value First Order Second Moment (MVFOSM). From the research results, it was found that the mooring system configuration meets the API RP 2SK criteria, both in intact and damaged condition. The results of local stress analysis on the triangle plate and chain support also meet the allowable stress. Reliability analysis for intact and damaged conditions at all loads shows that the most reliable configuration is the mooring line with a triangle plate position of 26 m, followed by 31 m, and last at the 36 m position with a reliability of 0,990398295 in the intact condition and 0,966042213 in the damaged condition.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Keandalan, Reliability, Mean Value First Order Second Moment, MVFOSM, Single Point Mooring, mooring line, triangle plate, chain stopper
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38101-(S2) Master Thesis
Depositing User:	Madea Eka Silfiani
Date Deposited:	01 Aug 2024 06:17
Last Modified:	17 Sep 2024 08:46
URI:	http://repository.its.ac.id/id/eprint/111080

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