Penentuan Strategi Inspeksi Pada Platform X Berbasis Risk Based Inspection (RBI) Berdasarkan Kekuatan Struktur

Nugraha, Christoforus Marchiavelly (2023) Penentuan Strategi Inspeksi Pada Platform X Berbasis Risk Based Inspection (RBI) Berdasarkan Kekuatan Struktur. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Indonesia merupakan salah satu penghasil minyak dan gas bumi dengan anjungan lepas pantai yang berjumlah ratusan yang tersebar di perairan Indonesia. Sebagian besar dari anjungan lepas pantai tersebut umumnya berjenis fixed offshore platform dan 72.08% diantaranya berumur dua kali atau bahkan lebih dari service life-nya. Seiring dengan penuaan umur, risiko anjungan lepas pantai pun meningkat yang ditandai dengan penurunan integritas struktur. Maka dari itu agar platform masih dapat memperpanjang umur operasi dan melanjutkan layanannya, perlu dilakukan identifikasi pada integritas struktur yang ada dan disiapkan langkah mitigasi yang tepat serta perawatan dan juga inspeksi. Untuk mengoptimalkan inspeksi agar efektif, strategi inspeksi harus ditentukan dengan tepat agar tidak terjadi kerusakan yang berkelanjutan pada platform serta kerugian biaya akibat over inspection. Sehingga, perlu adanya penentuan interval dan scope inpeksi yang tepat menggunakan metode Risk Based Inspection (RBI) dan didukung dengan mempertimbangkan kekuatan struktur melalui evaluasi integritas struktur. Evaluasi integritas struktur digunakan untuk mengetahui kondisi kekuatan struktur terkini berdasarkan hasil inspeksi terakhir sehingga dapat menentukan strategi mitigasi risiko yang tepat. RBI dapat menentukan kategori risiko platform, interval dan scope inspeksi yang tepat untuk platform tersebut. Hasil dari penelitian ini didapatkan terdapat beberapa member nilai UC>1 dengan nilai UC terbesar terjadi pada member 901-970 dengan nilai UC 2.88. Dari hasil analisis RBI didapatkan kondisi risiko Platform X berada pada kondisi medium dan interval inspeksi yang dijadwalkan adalah 9 tahun, sehingga Platform X akan melaksanakan inspeksi bawah air pada tahun 2027 (dihitung dari 2018) dengan scope inspeksi adalah L2, L3 dan L4 sesuai codes API RP 2SIM. Untuk meminimalisir potensi risiko yang terjadi, dilakukan mitigasi menggunakan metode strengthening pada member yang memiliki nilai UC>1. Setelah ditambahkan stiffener plate ketiga member tersebut memiliki nilai UC<1 dan berada pada kondisi aman, yaitu sebesar 0.67 untuk member 901-970, 0.82 untuk member 949-949, dan 0.54 untuk member 949-901.
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Indonesia is one of the oil and natural gas producers with hundreds of offshore platforms scattered throughout the country. Most of these offshore platforms are of the fixed offshore platform type, and 72.08% of them have exceeded their service life, aging twice or even more. With aging, the risk of offshore platforms increases, indicated by a decline in structural integrity. Therefore, to extend the operational life and continue their services, it is necessary to identify the existing structural integrity and prepare appropriate mitigation steps, maintenance, and inspections. To optimize inspections effectively, the inspection strategy must be accurately determined to avoid continuous damage to the platforms and cost losses due to over-inspection. Hence, it is essential to determine the appropriate inspection intervals and scopes using the Risk-Based Inspection (RBI) method, considering the structural strength through structural integrity evaluations. The evaluation of structural integrity is used to assess the current structural strength based on the latest inspection results, enabling the determination of the appropriate risk mitigation strategy. RBI can determine the risk category of the platform, as well as the suitable inspection intervals and scopes for that platform. From the results of this study, several members with UC values greater than 1 were found, with the highest UC value occurring in members 901-970 with a UC value of 2.88. Based on the RBI analysis, the risk condition of Platform X is categorized as medium, and the scheduled inspection interval is 9 years. Therefore, Platform X will undergo underwater inspections in the year 2027 (calculated from 2018) with inspection scopes of L2, L3, and L4 according to API RP 2SIM. To minimize potential risks, mitigation is performed using strengthening methods on members with UC values greater than 1. After adding stiffener plates, these three members have UC values less than 1, ensuring their safety, with values of 0.67 for member 901-970, 0.82 for member 949-949, and 0.54 for member 949-901.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Inspeksi platform, Jacket Platform, Risk Based Inspection (RBI), Strengthening, Structural Integrity Management (SIM)
Subjects:	H Social Sciences > HD Industries. Land use. Labor > HD3656 Inspection. Factory inspection T Technology > T Technology (General) > T174.5 Technology--Risk assessment. T Technology > TC Hydraulic engineering. Ocean engineering 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:	Christoforus Marchiavelly Nugraha
Date Deposited:	22 Jul 2023 08:05
Last Modified:	22 Jul 2023 08:05
URI:	http://repository.its.ac.id/id/eprint/98851

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