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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| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
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Nanyang Technological University
2023
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| Online Access: | https://hdl.handle.net/10356/168317 |
| _version_ | 1811688653126107136 |
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| author | Sun, Jiaxin |
| author2 | Xiao Zhongmin |
| author_facet | Xiao Zhongmin Sun, Jiaxin |
| author_sort | Sun, Jiaxin |
| collection | NTU |
| 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. |
| first_indexed | 2024-10-01T05:35:37Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/168317 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:35:37Z |
| publishDate | 2023 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-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 |
| spellingShingle | Engineering::Mechanical engineering Sun, Jiaxin Stress analysis for an offshore pipeline containing embedded cracks |
| title | 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_short | Stress analysis for an offshore pipeline containing embedded cracks |
| title_sort | stress analysis for an offshore pipeline containing embedded cracks |
| topic | Engineering::Mechanical engineering |
| url | https://hdl.handle.net/10356/168317 |
| work_keys_str_mv | AT sunjiaxin stressanalysisforanoffshorepipelinecontainingembeddedcracks |