Analisis Operabilitas Wet Parking Tension-leg Platform Terhadap Variasi Sistem Tambat di Perairan Selat Makassar

Putri, Hanna Ressica (2025) Analisis Operabilitas Wet Parking Tension-leg Platform Terhadap Variasi Sistem Tambat di Perairan Selat Makassar. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5020211062-Undergraduate_Thesis.pdf Restricted to Repository staff only Download (25MB) | Request a copy

Abstract

Tension-leg Platform (TLP) merupakah satu dari berbagai struktur apung lepas pantai yang digunakan dalam industri minyak dan gas untuk mengebor dan memproduksi minyak atau gas dari bawah laut. TLP yang sudah dibangun sejak tahun 2003 telah melewati masa operasional dan direncanakan untuk dilakukan decommissioning dengan metode wet parking dari lokasi awal menuju lokasi yang diakomodir. Pada penelitian kali ini terfokus pada analisis dinamis struktur TLP kondisi free floating dan analisis operabilitas struktur yang meliputi analisis sistem tambat dan anchor holding capacity. Pada hasil analisis dinamis struktur, didapatkan kesusuaian standard pada parameter validasi hidrostatis yang mengacu pada codes IACS. Response Amplitude Operator (RAO) struktur kondisi free floating disimulasikan pada heading 0°, 45°, 180°, 135°, 90°, 225°, 270° & 315 mendapatkan hasil dominasi gerakan translasional surge 180° (0.847 m/m) dan gerakan rotasional roll 135° (0.691 deg/m). Hasil verifikasi stabilitas struktur terhadap sistem ballast berada pada kondisi terbaik di 30% ballast water dengan nilai rasio 10.87. Pada analisis sistem tambat konfigurasi 2×4 menggunakan dua variasi mooring line, yaitu wire rope dan chain yang disimulasikan pada kondisi ULS dan ALS. Hasil simulasi ULS di kedalaman 30-m dan 50-m mendapat tension paling kritis pada tali mooring L3 dengan dominasi heading 225°. Tali mooring L3 diputus sebagai “one broken line” untuk analisis kondisi ALS yang menghasilkan tension paling kritis pada tali mooring L4 dengan dominasi heading sama dengan kondisi ULS. Variasi grade mooring yang memiliki nilai SF maksimum (SF ≥ 1.67) jenis wire rope & chain adalah 89mm IWRC & 81mm R3 Studless. Pada analisis anchor holding capacity menggunakan nilai UHC dan maksimum tension (End B) pada tiap kedalaman berdasarkan jenis tanah (sand & clay), sehingga dihasilkan jenis drag anchor (Stevpris MK6 & FTTS MK4) lebih baik untuk menahan beban mooring dibandingkan jenis driven pile yang disebabkan oleh ketidakmampuannya dalam menahan beban lateral lebih besar.
==================================================================================================================================
The Tension-Leg Platform (TLP) is one of various floating offshore structures used in the oil and gas industry for drilling and producing oil or gas from beneath the sea. A TLP constructed since 2003 has completed its operational period and is planned for decommissioning using the wet parking method, moving from its initial location to an accommodated site. This research focuses on dynamic analysis of the TLP in free-floating conditions and operability assessment of the structure, including mooring system analysis and anchor holding capacity evaluation. The dynamic structural analysis results showed compliance with hydrostatic validation parameters referring to IACS standards. The Response Amplitude Operator (RAO) of the free-floating structure was simulated at headings of 0°, 45°, 180°, 135°, 90°, 225°, 270°, and 315°, revealing dominant surge motion at 180° (0.847 m/m) and rotational roll motion at 135° (0.691 deg/m). Stability verification of the structure against the ballast system showed optimal conditions at 30% ballast water with a ratio of 10.87. The mooring system analysis used a 2×4 configuration with two mooring line variations (wire rope and chain), simulated under ULS and ALS conditions. ULS simulation results at 30-m and 50-m depths showed the most critical tension in mooring line L3, predominantly at 225° heading. Mooring line L3 was disconnected as a "one broken line" for ALS condition analysis, resulting in the most critical tension occurring in mooring line L4 at the same heading as the ULS condition. The mooring grade variations that achieved the maximum safety factor (SF ≥ 1.67) were 89mm IWRC for wire rope and 81mm R3 Studless for chain. The anchor holding capacity analysis used UHC and maximum tension (End B) values at each depth based on soil type (sand and clay), demonstrating that drag anchors (Stevpris MK6 and FTTS MK4) performed better in resisting mooring loads compared to driven piles due to the latter's inability to withstand larger lateral loads.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Kapasitas Jangkar, Sistem Tambat, Tension-leg Platform, Wet Parking
Subjects:	Q Science > QC Physics Q Science > QC Physics > QC151 Fluid dynamics V Naval Science > VK > VK361 Mooring of ships. Dry docks V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM1 Ballast (Ships) V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM761 Stability of ships
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Hanna Ressica Putri
Date Deposited:	14 Jul 2025 01:30
Last Modified:	14 Jul 2025 01:30
URI:	http://repository.its.ac.id/id/eprint/119567

Actions (login required)

View Item