Safety assessment of incomplete penetration defects at the root of girth welds in pipelines
| Autor: | Wen Wang, Zhan-Feng Chen, He Yang, Keqing Lu, Jia-Qi Lin |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
Materials science business.industry 020209 energy Ocean Engineering 02 engineering and technology Structural engineering Welding Penetration (firestop) 01 natural sciences Girth (geometry) Finite element method 010305 fluids & plasmas law.invention Residual strength Stress (mechanics) Pipeline transport law 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Submarine pipeline business |
| Zdroj: | Ocean Engineering. 230:109003 |
| ISSN: | 0029-8018 |
| Popis: | The connection between two submarine pipelines is usually made by welding. In the process of welding, the incomplete penetration, incomplete fusion, porosity, cracks and other welding defects are hardly preventable. The incomplete penetration defects at the root of pipeline girth welds can greatly reduce the safety of submarine pipelines and increase the risk of pipeline failure. In this paper, the safety assessment of incomplete penetration defects at the root of pipeline girth welds are studied. Firstly, a novel model of incomplete penetration defects at the root of girth weld pipelines is provided. Then, an analytical solution of the novel model is obtained according to stress function method. Next, the residual strength equation of the incomplete penetration defects at the root of pipeline girth welds is derived based on the analytical solution. In the end, the calculated results of the residual strength equation are verified by finite element method (FEM) and experiment. The results indicate that the calculated values are in good agreement with the FEM and experiment. In addition, the results indicate that the safety assessment method of incomplete penetration defects at the root of pipeline girth welds is feasible. It is beneficial for the safety assessment of pipelines with incomplete penetration defects. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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