Safety assessment on girth welds of large-diameter X80 pipelines in water network area
As the soil in the water network area is soft and has large water content, it is very easy to settle, which applies an axial load to the pipeline, and the girth weld under the action of tensile load has a higher risk of failure. In order to ensure the intrinsic safety of the pipeline, a nonlinear fi...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Oil & Gas Storage and Transportation
2023-10-01
|
| Series: | You-qi chuyun |
| Subjects: | |
| Online Access: | https://yqcy.pipechina.com.cn/cn/article/doi/10.6047/j.issn.1000-8241.2023.10.006 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841525890844983296 |
|---|---|
| author | Yuqing LIU Zhenyong ZHANG Shengsi WU Beilei JI Hong ZHANG Xiaoben LIU |
| author_facet | Yuqing LIU Zhenyong ZHANG Shengsi WU Beilei JI Hong ZHANG Xiaoben LIU |
| author_sort | Yuqing LIU |
| collection | DOAJ |
| description | As the soil in the water network area is soft and has large water content, it is very easy to settle, which applies an axial load to the pipeline, and the girth weld under the action of tensile load has a higher risk of failure. In order to ensure the intrinsic safety of the pipeline, a nonlinear finite element method was adopted to establish a numerical calculation model for the axial stress and strain of the pipeline under sudden settlement of soft soil based on the X80 pipeline with a diameter of 1 422 mm in the water network area, and thus the influence of different settlement displacements of soft soil on the size and distribution of the axial load of pipeline under the most unfavorable sudden displacement condition was studied. On this basis, the safety of pipeline welds at different locations in the soft soil settlement area was evaluated according to the Guide to Methods for Assessing the Acceptability of Flaws in Metallic Structures (BS 7910-2019). Meanwhile, the influence of external load conditions and weld misalignment was analyzed, which indicates that the increase of misalignment leads to an increase in the load ratio and toughness ratio used in the assessment, with the conservativeness reduced for the safety of pipeline. If the critical Crack Tip Opening Displacement (CTOD) is taken to be 0.25 mm in the current standard, and the level-1 assessment curve is adopted, the welds of X80 pipeline in the water network area are always in a safe state. If the level-2 assessment curve is used, the X80 pipeline weld is in a critical safe state when the critical CTOD is reduced to 0.08 mm and the settlement displacement takes the maximum value of 1 m. |
| format | Article |
| id | doaj-art-e421b997ee114357b9cc151aefd10ad4 |
| institution | Kabale University |
| issn | 1000-8241 |
| language | zho |
| publishDate | 2023-10-01 |
| publisher | Editorial Office of Oil & Gas Storage and Transportation |
| record_format | Article |
| series | You-qi chuyun |
| spelling | doaj-art-e421b997ee114357b9cc151aefd10ad42025-01-17T06:49:20ZzhoEditorial Office of Oil & Gas Storage and TransportationYou-qi chuyun1000-82412023-10-0142101128113610.6047/j.issn.1000-8241.2023.10.006yqcy-42-10-1128Safety assessment on girth welds of large-diameter X80 pipelines in water network areaYuqing LIU0Zhenyong ZHANG1Shengsi WU2Beilei JI3Hong ZHANG4Xiaoben LIU5China Petroleum Pipeline Engineering CorporationChina Petroleum Pipeline Engineering CorporationChina University of Petroleum (Beijing)//National Engineering Research Center for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil and Gas Distribution TechnologyChina University of Petroleum (Beijing)//National Engineering Research Center for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil and Gas Distribution TechnologyChina University of Petroleum (Beijing)//National Engineering Research Center for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil and Gas Distribution TechnologyChina University of Petroleum (Beijing)//National Engineering Research Center for Pipeline Safety//MOE Key Laboratory of Petroleum Engineering//Beijing Key Laboratory of Urban Oil and Gas Distribution TechnologyAs the soil in the water network area is soft and has large water content, it is very easy to settle, which applies an axial load to the pipeline, and the girth weld under the action of tensile load has a higher risk of failure. In order to ensure the intrinsic safety of the pipeline, a nonlinear finite element method was adopted to establish a numerical calculation model for the axial stress and strain of the pipeline under sudden settlement of soft soil based on the X80 pipeline with a diameter of 1 422 mm in the water network area, and thus the influence of different settlement displacements of soft soil on the size and distribution of the axial load of pipeline under the most unfavorable sudden displacement condition was studied. On this basis, the safety of pipeline welds at different locations in the soft soil settlement area was evaluated according to the Guide to Methods for Assessing the Acceptability of Flaws in Metallic Structures (BS 7910-2019). Meanwhile, the influence of external load conditions and weld misalignment was analyzed, which indicates that the increase of misalignment leads to an increase in the load ratio and toughness ratio used in the assessment, with the conservativeness reduced for the safety of pipeline. If the critical Crack Tip Opening Displacement (CTOD) is taken to be 0.25 mm in the current standard, and the level-1 assessment curve is adopted, the welds of X80 pipeline in the water network area are always in a safe state. If the level-2 assessment curve is used, the X80 pipeline weld is in a critical safe state when the critical CTOD is reduced to 0.08 mm and the settlement displacement takes the maximum value of 1 m.https://yqcy.pipechina.com.cn/cn/article/doi/10.6047/j.issn.1000-8241.2023.10.006x80 pipelinewater network areagirth weldfinite element analysisfailure assessment diagram (fad)applicability assessment |
| spellingShingle | Yuqing LIU Zhenyong ZHANG Shengsi WU Beilei JI Hong ZHANG Xiaoben LIU Safety assessment on girth welds of large-diameter X80 pipelines in water network area You-qi chuyun x80 pipeline water network area girth weld finite element analysis failure assessment diagram (fad) applicability assessment |
| title | Safety assessment on girth welds of large-diameter X80 pipelines in water network area |
| title_full | Safety assessment on girth welds of large-diameter X80 pipelines in water network area |
| title_fullStr | Safety assessment on girth welds of large-diameter X80 pipelines in water network area |
| title_full_unstemmed | Safety assessment on girth welds of large-diameter X80 pipelines in water network area |
| title_short | Safety assessment on girth welds of large-diameter X80 pipelines in water network area |
| title_sort | safety assessment on girth welds of large diameter x80 pipelines in water network area |
| topic | x80 pipeline water network area girth weld finite element analysis failure assessment diagram (fad) applicability assessment |
| url | https://yqcy.pipechina.com.cn/cn/article/doi/10.6047/j.issn.1000-8241.2023.10.006 |
| work_keys_str_mv | AT yuqingliu safetyassessmentongirthweldsoflargediameterx80pipelinesinwaternetworkarea AT zhenyongzhang safetyassessmentongirthweldsoflargediameterx80pipelinesinwaternetworkarea AT shengsiwu safetyassessmentongirthweldsoflargediameterx80pipelinesinwaternetworkarea AT beileiji safetyassessmentongirthweldsoflargediameterx80pipelinesinwaternetworkarea AT hongzhang safetyassessmentongirthweldsoflargediameterx80pipelinesinwaternetworkarea AT xiaobenliu safetyassessmentongirthweldsoflargediameterx80pipelinesinwaternetworkarea |