Analisis Perpanjangan Umur Operasi Wellhead X Platform dengan Metode Cumulative Damage dan Fracture Mechanics

Yusri, Nabila Hisanah (2026) Analisis Perpanjangan Umur Operasi Wellhead X Platform dengan Metode Cumulative Damage dan Fracture Mechanics. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dalam perancangan struktur lepas pantai, aspek keamanan terhadap potensi kegagalan akibat beban lingkungan dan kelelahan material menjadi faktor penting yang harus diperhatikan. Kelelahan atau fatigue sering kali menjadi penyebab utama munculnya retakan pada sambungan las (weld joint), khususnya di area joint can yang memiliki geometri kompleks dan menerima beban dinamis tinggi. Dalam penelitian ini, kasus yang dikaji adalah Wellhead X Platform yang berlokasi di Selat Madura. Telah beroperasi sejak tahun 2002, struktur tersebut memiliki design life selama 25 tahun dan direncanakan untuk diperpanjang umur operasinya hingga 29 tahun. Untuk memastikan kelayakan struktur selama masa operasi tambahan tersebut, dilakukan evaluasi terhadap integritas dan umur kelelahan struktur melalui dua pendekatan, yaitu metode fatigue cumulative damage dan fracture mechanics. Berdasarkan pendekatan ISO 19902, dalam menganalisis umur kelelahan diperlukan umur kelelahan minimum yang harus dipenuhi dan dalam penelitian ini umur kelelahan minimum berusia 54 tahun. Hasil analisis fatigue cumulative damage didapatkan umur kelelahan struktur terendah adalah 2,28 tahun pada joint 502L. Joint tersebut dianggap sebagai joint kritis dan dianalisis lebih lanjut umur kelelahannya dengan metode fracture mechanics. Didapatkan hasil bahwa umur kelelahan struktur pada joint 502L sebesar 2,30 tahun. Dari kedua metode tersebut, maka struktur Wellhead X Platform hanya mampu beroperasi selama 27 tahun. Apabila ingin diperpanjang umur operasinya selama 29 tahun maka tubular kaki struktur perlu dilakukan penguatan dengan metode repair Fiber-Reinforce Polymer (FRP) karena dapat memberikan proses perbaikan yang cepat, tahan korosi, dan memiliki kemampuan aplikasi di bawah air yang andal.
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In the design of offshore structures, safety aspects against potential failures caused by environmental loads and material fatigue are critical factors that must be considered. Fatigue is often the main cause of crack initiation in welded joints, particularly in the joint can area, which has complex geometry and is subjected to high dynamic loads. The case studied in this research is the Wellhead X Platform located in the Madura Strait. The structure has been in operation since 2002 with a design life of 25 years and is planned to be extended to 29 years. To ensure the structural integrity during the extended operational period, an evaluation of the structure’s integrity and remaining service life is conducted using two approaches. There is fatigue cumulative damage method and fracture mechanics method. Based on the ISO 19902 approach, in analyzing fatigue life, a minimum fatigue life is required to be met and in this study the minimum fatigue life is 54 years. The results of fatigue cumulative damage analysis obtained the lowest structural fatigue life is 2.28 years at joint 502L. This joint is considered as critical joint and its fatigue life is further explained using fracture mechanics method. The results showed that with fracture mechanics approach, the structural fatigue life was 2.30 years. Using both methods, the Wellhead X Platform structure could only operate for 27 years. To extend its service life to 29 years, the jacket leg structure would need to be reinforced using the Fiber-Reinforced Polymer (FRP) repair method, as it offers a fast repair process, is corrosion-resistant, and offers reliable underwater application capabilities.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Fatigue Cumulative Damage, Fracture Mechanics, Perpanjangan Umur Operasi,Umur Kelelahan Struktur, Wellhead X Platform, Fatigue Cumulative Damage, Fatigue Life, Fracture Mechanics, Service Life, Wellhead X Platform
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering)
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Nabila Hisanah Yusri
Date Deposited:	21 Jul 2026 02:54
Last Modified:	21 Jul 2026 02:54
URI:	http://repository.its.ac.id/id/eprint/135757

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