Analisis Kelelahan pada Pipeline Saat Instalasi dengan Variasi Radius Curvature of Stinger dan Kedalaman Laut

Ardiansyah, Ardi (2019) Analisis Kelelahan pada Pipeline Saat Instalasi dengan Variasi Radius Curvature of Stinger dan Kedalaman Laut. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Instalasi pipa bawah laut merupakan langkah awal untuk memulai ekspliotasi minyak di lepas pantai, pipa bawah laut telah menjadi media transportasi minyak dan gas yang paling banyak digunakan di seluruh dunia, hal ini karena penggunaan pipa bawah laut lebih menghemat biaya dibanding dengan media transportasi lain. Hal yang perlu diperhatikan saat instalasi pipa bawah laut adalah barge standby time, dimana pada kondisi ini barge berada pada kondisi standby. Kondisi ini dapat disebabkan karena kerusakan peralatan penunjang instalasi pipa bawah laut seperti tensioner, roller, atau welder sehingga instalasi pipa bawah laut harus dihentikan. Oleh karena itu dalam penelitian ini dilakukan analisis kelelahan pada pipeline saat instalasi dengan variasi radius curvature of stinger dan kedalaman laut. Analisis tegangan dan regangan dilakukan dengan menggunakan software OFFPipe sedangkan analisis fatigue damage dilakukan dengan menggunakan software J-Rain. Dari hasil analisis diketahui bahwa tegangan dan regangan telah memenuhi syarat DNV-OS-F101 dimana tegangan tidak boleh melebihi 87% SMYS dan regangan tidak boleh melebihi 0.305%. Semakin besar nilai radius curvature of stinger maka nilai tegangan dan regangan semakin besar dan semakin dalam perairan maka semakin besar tegangan dan regangannya. Selanjutnya nilai barge standby time terbesar terjadi pada kedalaman 34 m pada radius curvature of stinger 150 m dengan nilai 15.37 hari dan nilai barge standby time terkecil terjadi pada kedalaman 42 m pada radius curvature of stinger 170 m dengan nilai 2.45 hari. =============================================================================================== Subsea pipeline installation is the very first step to start the oil exploitation in offshore area, subsea pipeline has been the most famous transportation media for oil and gas, it is because subsea pipeline is cheaper than the other transportation media. One of the important thing that must be observed during subsea pipeline installation is barge standby time, in this condition the barge is in stanby condition. This condition can be caused by damage of the pipeline installation’s tools such as tensioner, roller, or welder so the pipeline installation process must be terminated. So this paper is analysing the fatigue analysis on subsea pipeline during installation with variation of radius curvature of stinger and water depth. The stress and strain analysis were calculated using OFFPipe software and the fatigue damage was calculated using J-Rain software. It is found from the analysis that the stress has meet the minimum requirement according to DNV-OS-F101 which the stress must below 87% SMYS and the strain must below 0.305%. If the radius curvature of stinger is longer, then the the stress and strain are bigger and if the ocean is deeper, then the stress and strain are bigger. The biggest barge standby time is 15.37 days, it is occured in 34 m water depth on radius curvature of stinger 150 m. And the smallest barge standby time is 2.45 days, it is occured in 42 m water depth on radius curvature of stinger 170 m.

Item Type: Thesis (Undergraduate)
Additional Information: RSKe 621.867 2 Ard a-1 2019
Uncontrolled Keywords: pipeline, tegangan, regangan, fatigue damage, barge standby time
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures
T Technology > TJ Mechanical engineering and machinery > TJ930 Pipelines (General). Underwater pipelines.
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics
Divisions: Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User: Ardi Ardiansyah
Date Deposited: 04 Jun 2021 03:55
Last Modified: 12 Jun 2021 04:47
URI: https://repository.its.ac.id/id/eprint/60303

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