DocumentCode
3438771
Title
Notice of Retraction
Reliability-based integrity assessment of pipeline girth weld defects
Author
Jian Chen ; Qing-Shan Feng ; Hai-Liang Zhang ; Ming-Fei Li ; Fu-Xiang Wang ; Song Lin
Author_Institution
PetroChina Pipeline R&D Center, Langfang, China
fYear
2013
fDate
15-18 July 2013
Firstpage
965
Lastpage
968
Abstract
Notice of Retraction
After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.
We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.
The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.
A large number of girth weld defects were found by tri-axial MFL in-line inspection of one natural gas transmission pipeline of PetroChina. In one certain inspection region of 70.9 km, 7392 girth weld defects were reported. These defects were found to be welding defects formed in the construction period through excavation validation. The integrity assessment method in code BS 7910 is used to assess the acceptability of these defects and to make repair decisions. However, the deterministic assessment result is significantly affected by different selected partial safety factors due to the uncertainties of defect sizing and material properties. In this paper, a reliability-based integrity assessment method is proposed. A Monte Carlo simulation method is used to estimate the failure probabilities of girth weld defects. Parameter distributions are discussed and the failure probabilities are calculated using a Matlab program. The assessment result of the reliability-based method is compared with that of deterministic assessment method. As a conclusion, the reliability-based method proposed in this paper can be used in the integrity assessment procedure to provide some important references for making repair decisions.
After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.
We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.
The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.
A large number of girth weld defects were found by tri-axial MFL in-line inspection of one natural gas transmission pipeline of PetroChina. In one certain inspection region of 70.9 km, 7392 girth weld defects were reported. These defects were found to be welding defects formed in the construction period through excavation validation. The integrity assessment method in code BS 7910 is used to assess the acceptability of these defects and to make repair decisions. However, the deterministic assessment result is significantly affected by different selected partial safety factors due to the uncertainties of defect sizing and material properties. In this paper, a reliability-based integrity assessment method is proposed. A Monte Carlo simulation method is used to estimate the failure probabilities of girth weld defects. Parameter distributions are discussed and the failure probabilities are calculated using a Matlab program. The assessment result of the reliability-based method is compared with that of deterministic assessment method. As a conclusion, the reliability-based method proposed in this paper can be used in the integrity assessment procedure to provide some important references for making repair decisions.
Keywords
Monte Carlo methods; estimation theory; failure analysis; flaw detection; inspection; maintenance engineering; natural gas technology; pipelines; reliability; welding; welds; Matlab program; Monte Carlo simulation method; PetroChina; code BS 7910; construction period; defect sizing; deterministic assessment method; excavation validation; failure probability estimation; inspection region; integrity assessment procedure; material property; natural gas transmission pipeline; parameter distributions; partial safety factors; pipeline girth weld defects; reliability-based integrity assessment method; reliability-based method; repair decisions; tri-axial MFL in-line inspection; welding defects; Maintenance engineering; Monte Carlo methods; Optical fibers; Pipelines; Reliability; Safety; Welding; Monte Carlo simulation; girth weld defect; integrity assessment; pipeline; reliability;
fLanguage
English
Publisher
ieee
Conference_Titel
Quality, Reliability, Risk, Maintenance, and Safety Engineering (QR2MSE), 2013 International Conference on
Conference_Location
Chengdu
Print_ISBN
978-1-4799-1014-4
Type
conf
DOI
10.1109/QR2MSE.2013.6625727
Filename
6625727
Link To Document