Pengaruh Subsidence Terhadap Rasio Kekuatan Cadangan Minimum Wellhead Platform 3 Kaki dan Analisis Tegangan Lokal Pada Sambungan Kritis

Setiawan, Hans Aristo (2024) Pengaruh Subsidence Terhadap Rasio Kekuatan Cadangan Minimum Wellhead Platform 3 Kaki dan Analisis Tegangan Lokal Pada Sambungan Kritis. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dalam beberapa tahun terakhir, telah ada upaya penyelidikan eksperimental dan analitis yang dilakukan Jacket Platform adalah salah satu jenis struktur lepas pantai yang bersifat tetap. Banyak anjungan minyak dan gas yang beroperasi di perairan Indonesia saat ini menghadapi tantangan serius terkait ketahanan struktur menghadapi subsidence pada operasi mereka. Oleh karena itu, penelitian ini akan berfokus pada analisis kekuatan ultimate untuk mengetahui RSR terhadap efek beban dan subsidence dan juga analsis tegangan lokal pada joint kritis. Berdasarkan analisis yang telah dilakukan Nilai Unity Check terbesar pada kondisi non subsidence terdapat pada member 0102-702L dengan besar UC yaitu 0.801. dan untuk kondisi subsidence 2.9 m yaitu dengan nilai UC sebesar 0.996. Nilai Reserve Strength Ratio terkecil pada kondisi non-subsidence terjadi pada arah 180° dengan nilai 1.368926. Kemudian untuk nilai RSR terkecil pada kondisi subsidence 2.9 m didapatkan sebesar 0.816255. Tegangan tertinggi joint kritis 702L kondisi non-subsidence terjadi pada brace 1 berlokasi di braceside dengan besar tegangan 127.89 MPa, sedangkan tegangan minimum terjadi pada brace 3 berlokasi di chordside yaitu sebesar 1.5843 MPa. Tegangan rata – rata tertinggi terjadi pada brace 1 berlokasi di braceside dengan nilai sebesar 48.316 MPa. Kemudian untuk tegangan tertinggi joint kritis 702L kondisi subsidence 2.9 m terjadi pada brace 1 berlokasi di braceside dengan besar tegangan 151.12 MPa, sedangkan tegangan minimum terjadi pada brace 3 berlokasi di chordside yaitu sebesar 1.4288 MPa. Tegangan rata – rata tertinggi terjadi pada brace 1 berlokasi di braceside dengan nilai sebesar 60.165 MPa
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In recent years, there have been experimental and analytical investigation efforts carried out. Jacket platforms are a type of fixed offshore structure. Many oil and gas platforms operating in Indonesian waters are currently facing serious challenges regarding structural resilience in the face of subsidence in their operations. Therefore, this research will focus on ultimate strength analysis to determine RSR on the effects of load and subsidence and also local stress analysis at critical joints. Based on the analysis that has been carried out, the largest Unity Check value in non-subsidence conditions is found in member 0102-702L with a UC value of 0.801. and for subsidence conditions of 2.9 m, namely with a UC value of 0.996. The smallest Reserve Strength Ratio value in non-subsidence conditions occurs in the 180° direction with a value of 1.368926. Then, the smallest RSR value in the subsidence condition of 2.9 m is 0.816255. The highest stress of the 702L critical joint in non-subsidence conditions occurs in brace 1 located on the braceside with a stress of 127.89 MPa, while the minimum stress occurs in brace 3 located on the chordside, namely 1.5843 MPa. The highest average stress occurred in brace 1 located on the braceside with a value of 48,316 MPa. Then, for the highest stress of the 702L critical joint, a subsidence condition of 2.9 m occurs in brace 1 located on the braceside with a stress of 151.12 MPa, while the minimum stress occurs in brace 3 located on the chordside, namely 1.4288 MPa. The highest average stress occurs in brace 1 located on the braceside with a value of 60,165 MPa

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Fixed Offshore Platform, Subsidence, Pushover Analysis, Reserve Strenght Ratio, Fixed Offshore Platform, Subsidence, Pushover Analysis, Reserve Strenght Ratio
Subjects:	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:	Hans Aristo Setiawan
Date Deposited:	22 Jul 2024 07:13
Last Modified:	22 Jul 2024 07:13
URI:	http://repository.its.ac.id/id/eprint/108631

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