Analisis Pengaruh Scouring Pada Jacket Platform Tipe Grouting Berbasis Keandalan

Mahfiro, Ainul (2023) Analisis Pengaruh Scouring Pada Jacket Platform Tipe Grouting Berbasis Keandalan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Jacket platform merupakan struktur lepas pantai yang digunakan untuk menopang fasilitas produksi minyak dan gas di perairan dalam. Scouring adalah proses pengikisan atau erosi dasar laut yang dapat mempengaruhi stabilitas dan keandalan struktur jacket platform. Terjadinya scouring dapat menyebabkan kegagalan struktur. Apabila terjadi kegagalan, struktur dapat mengalami berbagai kemungkinan konsekuensi yang bisa menimbulkan bahaya hingga kerugian. Mengingat konsekuensi dan kerugian yang mungkin terjadi maka penting untuk memahami pengaruh scouring terhadap keandalan struktur dan mengembangkan metode analisis yang tepat untuk mengestimasi risiko kegagalan. Oleh karena itu, dilakukan analisis keandalan pada struktur dengan variasi kedalaman scouring hingga struktur mengalami keruntuhan. Analisis keruntuhan dilakukan dengan meningkatkan beban lingkungan kondisi badai secara bertahap hingga struktur mengalami keruntuhan karena terbentuknya member plastis. Member plastis akan digunakan dalam analisis keandalan, dimana peluang kegagalan member dihitung dengan simulasi Monte Carlo dengan menggunakan Random Number Generator (RNG). Kedalaman maksimum scouring yang diizinkan agar struktur masih layak beroperasi sesuai API RP 2A WSD 21st edition adalah sebesar 7.4 meter dengan Reserve Strength Ratio (RSR) terkecil yakni 1.848. Analisis keandalan dilakukan untuk kondisi non scouring hinga kondisi scouring 7.4 meter dengan keandalan pile terkecil sebesar 0.43623 dan Probability of Failure (PoF) sebesar 0.56378. Setelah dilakukan grouting pada pile, nilai keandalan pile terkecil sebesar 0,318 dan Probability of Failure (PoF) sebesar 0,682
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The jacket platform is an offshore structure used to support oil and gas production facilities in deep waters. Scouring is the process of seabed erosion that can affect the stability and reliability of the jacket platform structure. The occurrence of scouring can lead to structural failure. In the event of failure, the structure can experience various potential consequences that can pose dangers and losses. Considering the possible consequences and losses, it is important to understand the influence of scouring on the structural reliability and develop appropriate analysis methods to estimate the risk of failure.Therefore, a reliability analysis is conducted on the structure with varying depths of scouring until the structure experiences collapse. The collapse analysis is carried out by gradually increasing the environmental loads under storm conditions until the structure collapses due to the formation of plastic members. The plastic members will be used in the reliability analysis, where the failure probability of the members is calculated using Monte Carlo simulation with a Random Number Generator (RNG). The maximum allowable scouring depth for the structure to remain operational, according to API RP 2A WSD 21st edition, is 7.4 meters with the smallest Reserve Strength Ratio (RSR) being 1.848. The reliability analysis is performed for both non-scouring conditions and scouring conditions up to 7.4 meters, with the smallest pile reliability being 0.43623 and the Probability of Failure (PoF) being 0.56378. After grouting is done on the pile, the smallest pile reliability value is 0.318 and the Probability of Failure (PoF) is 0.682.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	scouring, jacket platform, grouting, keandalan
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA780 Piles and pile-driving T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials. T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	AINUL MAHFIRO
Date Deposited:	25 Jul 2023 07:06
Last Modified:	25 Jul 2023 07:06
URI:	http://repository.its.ac.id/id/eprint/99249

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