A calculation method for limit load of the gas pipelines with girth weld surface cracks
In this paper, a finite element model with girth weld defects considering crack tip singularity was established in order to facilitate the accurate and rapid safety assessment on girth weld defects of long distance gas Transmission pipeline. Then the J-integral of girth weld cracks in pipes with dif...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2019-10-01
|
| Series: | Natural Gas Industry B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352854019300920 |
| _version_ | 1827265289688973312 |
|---|---|
| author | Xu Wang Jian Shuai |
| author_facet | Xu Wang Jian Shuai |
| author_sort | Xu Wang |
| collection | DOAJ |
| description | In this paper, a finite element model with girth weld defects considering crack tip singularity was established in order to facilitate the accurate and rapid safety assessment on girth weld defects of long distance gas Transmission pipeline. Then the J-integral of girth weld cracks in pipes with different defect sizes was calculated, and the influence of weld matching coefficient and material hardening index on J-integral is analyzed. Furthermore, the influence factors of limit load of pipeline with girth weld defects based on J-integral theory are studied. Based on this, the engineering calculation formula which can calculate J-integral and limit load rapidly in the situations with specific matching coefficient and material hardening index was proposed. And the following research results were obtained. First, the engineering calculation formula based on the fitting of finite element calculation results has high accuracy, which can calculate the J-integral of defects in a large geometric range and the limit load of pipelines with girth weld cracks. Second, the J-integral of cracks in pipes with girth weld defects is closely related to defect size, material properties and weld matching coefficient, and the limit load of pipes with defects decreases as the crack size increases and increases as the material hardening index increases. Third, for the X80 pipes with surface cracks at the centerline of the girth weld, the load carrying capacity of the pipes with low-strength matched weld are lower than that with high-strength or equivalent-matched weld. In conclusion, the research results can be used as reference for the safety evaluation and integrity management of in-service gas pipelines. Keywords: X80 gas pipeline, Girth weld defect, J-integral, Limit load, Safety assessment |
| first_indexed | 2024-03-07T16:39:10Z |
| format | Article |
| id | doaj.art-35c94f3eea0a40778cd72396145d88c2 |
| institution | Directory Open Access Journal |
| issn | 2352-8540 |
| language | English |
| last_indexed | 2025-03-22T03:59:36Z |
| publishDate | 2019-10-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Natural Gas Industry B |
| spelling | doaj.art-35c94f3eea0a40778cd72396145d88c22024-04-28T10:34:37ZengKeAi Communications Co., Ltd.Natural Gas Industry B2352-85402019-10-0165481487A calculation method for limit load of the gas pipelines with girth weld surface cracksXu Wang0Jian Shuai1Corresponding author.; College of Safety and Ocean Engineering, China University of Petroleum, Beijing 102249, ChinaCollege of Safety and Ocean Engineering, China University of Petroleum, Beijing 102249, ChinaIn this paper, a finite element model with girth weld defects considering crack tip singularity was established in order to facilitate the accurate and rapid safety assessment on girth weld defects of long distance gas Transmission pipeline. Then the J-integral of girth weld cracks in pipes with different defect sizes was calculated, and the influence of weld matching coefficient and material hardening index on J-integral is analyzed. Furthermore, the influence factors of limit load of pipeline with girth weld defects based on J-integral theory are studied. Based on this, the engineering calculation formula which can calculate J-integral and limit load rapidly in the situations with specific matching coefficient and material hardening index was proposed. And the following research results were obtained. First, the engineering calculation formula based on the fitting of finite element calculation results has high accuracy, which can calculate the J-integral of defects in a large geometric range and the limit load of pipelines with girth weld cracks. Second, the J-integral of cracks in pipes with girth weld defects is closely related to defect size, material properties and weld matching coefficient, and the limit load of pipes with defects decreases as the crack size increases and increases as the material hardening index increases. Third, for the X80 pipes with surface cracks at the centerline of the girth weld, the load carrying capacity of the pipes with low-strength matched weld are lower than that with high-strength or equivalent-matched weld. In conclusion, the research results can be used as reference for the safety evaluation and integrity management of in-service gas pipelines. Keywords: X80 gas pipeline, Girth weld defect, J-integral, Limit load, Safety assessmenthttp://www.sciencedirect.com/science/article/pii/S2352854019300920 |
| spellingShingle | Xu Wang Jian Shuai A calculation method for limit load of the gas pipelines with girth weld surface cracks Natural Gas Industry B |
| title | A calculation method for limit load of the gas pipelines with girth weld surface cracks |
| title_full | A calculation method for limit load of the gas pipelines with girth weld surface cracks |
| title_fullStr | A calculation method for limit load of the gas pipelines with girth weld surface cracks |
| title_full_unstemmed | A calculation method for limit load of the gas pipelines with girth weld surface cracks |
| title_short | A calculation method for limit load of the gas pipelines with girth weld surface cracks |
| title_sort | calculation method for limit load of the gas pipelines with girth weld surface cracks |
| url | http://www.sciencedirect.com/science/article/pii/S2352854019300920 |
| work_keys_str_mv | AT xuwang acalculationmethodforlimitloadofthegaspipelineswithgirthweldsurfacecracks AT jianshuai acalculationmethodforlimitloadofthegaspipelineswithgirthweldsurfacecracks AT xuwang calculationmethodforlimitloadofthegaspipelineswithgirthweldsurfacecracks AT jianshuai calculationmethodforlimitloadofthegaspipelineswithgirthweldsurfacecracks |