Wicaksono, Adhe (2025) Analisis Umur Kelelahan Pada Well Tripod Platform yang mengalami Ageing Corrosion Dengan Variasi Marine Growth. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Fixed jacket platform telah banyak digunakan dalam eksploitasi migas, terutama pada perairan di Indonesia yang tidak tidak terlalu dalam. Permasalahan yang sering ditemui adalah adanya penipisan wall thickness akibat korosi dan penebalan marine growth pada struktur jacket. Pada Tugas Akhir ini, penulis akan menganalisis pengaruh marine growth terhadap umur kelelahan pada struktur yang mengalami ageing corrosion. Analisis umur kelelahan dilakukan dengan menggunakan metode cumulative damage dan fracture mechanic untuk memprediksi waktu kegagalan pada struktur jacket. Analisis awal yang dilakukan dengan memprediksi laju korosi berdasarkan data inspeksi. Data pertumbuhan marine growth yang juga berdasarkan hasil data inspeksi pada struktur jacket platform. Hasil analisis menunjukkan laju korosi yang terbesar yaitu 0.051 mm/years. Dalam analisis umur kelelahan menggunakan metode cumulative damage didapatkan bahwa struktur mengalami kegagalan ketika adanya pertumbuhan marine growth pada joint 301 member 301 - 205. Hal tersebut ditunjukkan pada model 1 dengan adanya tidak adanya korosi didapatkan sebesar 542 tahun dan model 2 dengan adanya korosi didapatkan sebesar 518 tahun. Lalu, pada struktur yang diberikan marine growth menghasilkan umur kelelahan yang ditunjukkan pada model 3 dengan tidak adanya korosi didapatkan sebesar 57 tahun dan model 4 dengan adanya korosi 53 tahun. Pada analisis selanjutnya menggunakan metode fracture mechanic akan dianalisis secara lokal dengan mengasumsikan adanya retak berbentuk semi elliptical dengan retak awal 0.0197 inch. Hasil yang didapatkan yaitu laju perambatan retak sebesar 9,7464E-05 in/cycle. Dari hasil laju perambatan retak pada struktur didapatkan hasil umur kelelahan kelelahan sebesar 20 tahun. Dari hasil kedua analisis tersebut menunjukkan bahwa umur kelelahan pada mengalami penurunan jika terdapat adanya pertumbuhan marine growth pada struktur jacket
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Fixed jacket platforms have been widely used in oil and gas exploitation, especially in waters in Indonesia that are not too deep. The problems that are often encountered are the thinning of the wall thickness due to corrosion and the thickening of marine growth on the jacket structure. In this Final Project, the author will analyze the effect of marine growth on the fatigue life of structures experiencing aging corrosion. Fatigue life analysis is carried out using the cumulative damage and fracture mechanic methods to predict the time of failure of the jacket structure. The initial analysis was carried out by predicting the corrosion rate based on inspection data. Marine growth data is also based on the results of inspection data on the jacket platform structure. The results of the analysis show the largest corrosion rate of 0.051 mm / years. In the fatigue life analysis using the cumulative damage method, it was found that the structure failed when there was marine growth on the joint 301 member 301 - 205. This is shown in model 1 with the absence of corrosion obtained 542 years and model 2 with corrosion obtained 518 years. Then, the structure given marine growth produces a fatigue life shown in model 3 with the absence of corrosion obtained 57 years and model 4 with corrosion 53 years. In the next analysis using the fracture mechanic method, it will be analyzed locally by assuming a semi-elliptical crack with an initial crack of 0.0197 inches. The results obtained are a crack propagation rate of 9.7464E-05 in/cycle. From the results of the crack propagation rate in the structure, the fatigue life of 20 years was obtained. The results of the two analyses indicate that the fatigue life decreases if there is marine growth in the jacket structure
Item Type: | Thesis (Other) |
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Uncontrolled Keywords: | Ageing Corrosion, Marine growth, Kelelahan, Cumulative Damage, Fracture Mechanic Ageing Corrosion, Marine growth, Fatigue,Cumulative Damage, Fracture Mechanic |
Subjects: | V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering |
Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
Depositing User: | Adhe Wicaksono |
Date Deposited: | 20 Jan 2025 07:30 |
Last Modified: | 20 Jan 2025 07:30 |
URI: | http://repository.its.ac.id/id/eprint/116437 |
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