Analisis Ultimate Strength Berbasis Keandalan Pada Conductor Supported Wellhead Platform Di Swamp Area

Nurlette, Arsyi Muthia Zenita (2026) Analisis Ultimate Strength Berbasis Keandalan Pada Conductor Supported Wellhead Platform Di Swamp Area. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Conductor Supported Wellhead Platform (CSWP) merupakan sebuah struktur minimalis yang menggunakan pipa konduktor sebagai penopang utama struktur. Penelitian ini mengevaluasi integritas struktur CSWP di wilayah swamp Delta Mahakam melalui analisis ultimate strength guna memperoleh Reserve Strength Ratio (RSR) dan System Redundancy (SR). Analisis dilakukan menggunakan perangkat lunak SACS dengan metode Full Plastic Collapse Analysis. Hasil analisis in place menunjukkan Unity Check (UC) terbesar sebesar 0,81 pada kondisi badai. Berdasarkan analisis pushover, diperoleh nilai RSR terkecil sebesar 5,45 pada pembebanan arah 0° yang merupakan arah paling kritis. Peluang kegagalan (Probability of Failure, PoF) sistem yang dihitung melalui simulasi Monte Carlo dengan 50.000 iterasi pada MATLAB menghasilkan nilai PoF sebesar 3.343 × 10^(-3)dengan indeks keandalan (β) 2,712. Berdasarkan standar DNV-RP-G101, struktur ini diklasifikasikan dalam kategori medium to high probability of failure, sehingga memerlukan pengawasan ketat selama masa operasionalnya.
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A Conductor Supported Wellhead Platform (CSWP) is a minimalist structure that uses conductor pipes as the main structural supports. This study evaluates the structural integrity of a CSWP in the swamp area of the Mahakam Delta through ultimate strength analysis to obtain the Reserve Strength Ratio (RSR) and System Redundancy (SR). The analysis was carried out using SACS software with the Full Plastic Collapse Analysis method. The in-place analysis results show that the maximum Unity Check (UC) value is 0.81 under storm conditions. Based on the pushover analysis, the minimum RSR value obtained is 5.45 under loading from 0°, which represents the most critical direction. The system Probability of Failure (PoF), calculated using Monte Carlo simulation with 50,000 iterations in MATLAB, yields a PoF value of 3.343 × 10⁻³, with a reliability index (β) of 2.712. According to DNV-RP-G101, the structure is classified as having a medium to high probability of failure and therefore requires close monitoring during operation.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	CSWP, Ultimate Strength, Pushover, RSR, Probability of Failure, CSWP, Ultimate Strength, Pushover, RSR, Probability of Failure
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Arsyi Muthia Zenita Nurlette
Date Deposited:	20 Jan 2026 07:13
Last Modified:	20 Jan 2026 07:13
URI:	http://repository.its.ac.id/id/eprint/129840

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