Stress analysis for an offshore pipeline containing embedded cracks

Offshore pipelines have been crucial in the transportation of oil and gas for energy purposes over time. Carbon steels have emerged as a popular material for constructing cost-effective offshore pipelines. Given that these pipelines can span hundreds of kilometers, the welding of multiple shorter pi...

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Main Author: Sun, Jiaxin
Other Authors: Xiao Zhongmin
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2023
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Online Access:https://hdl.handle.net/10356/168317
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1683172023-06-17T16:52:46Z Stress analysis for an offshore pipeline containing embedded cracks Sun, Jiaxin Xiao Zhongmin School of Mechanical and Aerospace Engineering MZXIAO@ntu.edu.sg Engineering::Mechanical engineering Offshore pipelines have been crucial in the transportation of oil and gas for energy purposes over time. Carbon steels have emerged as a popular material for constructing cost-effective offshore pipelines. Given that these pipelines can span hundreds of kilometers, the welding of multiple shorter pipes is often necessary. However, the welding process can result in defects like cracks and porosity, which are difficult to avoid. These defects may reduce the lifespan of the pipes and even cause pipe failure under stress loadings underwater. In certain instances, the presence of cracks that are close to each other may cause a crack to propagate at a faster rate and ultimately merge with adjacent cracks. This phenomenon can significantly accelerate the growth of fatigue cracks and has important implications for the failure analysis and prevention of offshore pipelines, potentially reducing their lifespan. The objective of this report is to examine how the different directional stress loading could affect the propagation of the cracks. In addition, to compare the material properties that are commonly used for subsea pipelines. To achieve this objective, computational simulations were conducted using ANSYS Workbench 19.2, a Finite Element Software. The primary focus was to investigate the fatigue lifespan of the pipeline. Bachelor of Engineering (Mechanical Engineering) 2023-06-12T01:07:05Z 2023-06-12T01:07:05Z 2023 Final Year Project (FYP) Sun, J. (2023). Stress analysis for an offshore pipeline containing embedded cracks. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/168317 https://hdl.handle.net/10356/168317 en application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Mechanical engineering
spellingShingle Engineering::Mechanical engineering
Sun, Jiaxin
Stress analysis for an offshore pipeline containing embedded cracks
description Offshore pipelines have been crucial in the transportation of oil and gas for energy purposes over time. Carbon steels have emerged as a popular material for constructing cost-effective offshore pipelines. Given that these pipelines can span hundreds of kilometers, the welding of multiple shorter pipes is often necessary. However, the welding process can result in defects like cracks and porosity, which are difficult to avoid. These defects may reduce the lifespan of the pipes and even cause pipe failure under stress loadings underwater. In certain instances, the presence of cracks that are close to each other may cause a crack to propagate at a faster rate and ultimately merge with adjacent cracks. This phenomenon can significantly accelerate the growth of fatigue cracks and has important implications for the failure analysis and prevention of offshore pipelines, potentially reducing their lifespan. The objective of this report is to examine how the different directional stress loading could affect the propagation of the cracks. In addition, to compare the material properties that are commonly used for subsea pipelines. To achieve this objective, computational simulations were conducted using ANSYS Workbench 19.2, a Finite Element Software. The primary focus was to investigate the fatigue lifespan of the pipeline.
author2 Xiao Zhongmin
author_facet Xiao Zhongmin
Sun, Jiaxin
format Final Year Project
author Sun, Jiaxin
author_sort Sun, Jiaxin
title Stress analysis for an offshore pipeline containing embedded cracks
title_short Stress analysis for an offshore pipeline containing embedded cracks
title_full Stress analysis for an offshore pipeline containing embedded cracks
title_fullStr Stress analysis for an offshore pipeline containing embedded cracks
title_full_unstemmed Stress analysis for an offshore pipeline containing embedded cracks
title_sort stress analysis for an offshore pipeline containing embedded cracks
publisher Nanyang Technological University
publishDate 2023
url https://hdl.handle.net/10356/168317
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