E25 Proposal of Defect Assessment Methods in New Mg Casting Alloy

In the pipeline construction, the girth welds tend to be the weakness because of defects and microstructural heterogeneities. The importance of suitable assessment of various defects in the weld is not only to prevent the cracks from unstable growth to cause catastrophic accident but also can effectively reduce the weld repair to reduce construction cost. Although many welding defects assessment methods and codes have been applied in this field, there are many differences among them. In this paper, the application of weld defect assessment methods was extensively studied. The key points of ECA applications, such as the pipeline axial stress and toughness, have been introduced. Furthermore, some suggestions were given on the application of girth weld ECA assessment.

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How Do Defect Assessment Methods Influence the Choice and Construction of In-Line Inspection Tools

4th International Pipeline Conference, Parts A and B ◽

10.1115/ipc2002-27391 ◽

2002 ◽

Cited By ~ 2

Author(s):

Konrad Reber ◽

Michael Beller ◽

Neb I. Uzelac

Keyword(s):

Fracture Mechanics ◽

Crack Detection ◽

Assessment Methods ◽

Defect Assessment ◽

Minimum Requirements

The paper describes which aspects of tool accuracy are important for the choice of ILI tools and design of new ones. It is discussed what constitutes an inspection run comparison. What kind of work is carried out, especially if several ILI vendors are involved? What kind of integrity statement can be deduced and how is this influenced by tool accuracy? Finally, the paper will discuss how some aspects of fracture mechanics affect the design of crack detection pigs. What are the minimum requirements for an ILI tool to allow for reasonable defect assessment? In addition, relation between companies performing In-Line Inspection (ILI) and those providing defect assessment is discussed. To what degree should an inspection company also deal with issues of pipeline integrity?

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Review of Defect Distributions for Probabilistic Structural Integrity Assessment

21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 3 ◽

10.1115/omae2002-28616 ◽

2002 ◽

Cited By ~ 4

Author(s):

W. Zhao ◽

A. Stacey

Keyword(s):

Future Development ◽

Structural Integrity ◽

Assessment Methods ◽

Considerable Variability ◽

Welded Structures ◽

Defect Distribution ◽

Integrity Assessment ◽

Defect Assessment ◽

Considerable Research ◽

The Subject

The defect distribution is a particularly important parameter in the application of probabilistic defect assessment methods to the integrity assessment of welded structures. However, the subject is complex and, despite considerable research efforts in this area and the availability of a significant body of data, this defect distribution is subject to considerable variability and uncertainty. This paper reviews the data in the literature, providing a status review of defect distributions and the identification of areas requiring further investigation, with a view to assisting with the future development of probabilistic defect assessment methods.

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Investigation of fast and accurate reticle defect assessment methods using STARlight for chrome-on-glass reticle defects

10.1117/12.392033 ◽

2000 ◽

Author(s):

Ingrid B. Peterson ◽

Kaustuve Bhattacharyya ◽

Enio L. Carpi ◽

Darius Brown ◽

Martin Verbeek ◽

...

Keyword(s):

Assessment Methods ◽

Defect Assessment

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Engineering Critical Assessment for the Flaws in the Pipeline Steel Girth Weld

Materials Science Forum ◽

10.4028/www.scientific.net/msf.850.881 ◽

2016 ◽

Vol 850 ◽

pp. 881-888

Author(s):

Jiang Qiao Wu ◽

Deng Zun Yao ◽

Xin Ran Yuan ◽

Tian Qi Wang ◽

Long Zhang

Keyword(s):

Pipeline Steel ◽

Critical Assessment ◽

Assessment Methods ◽

Key Factors ◽

Weld Repair ◽

Defect Assessment ◽

Welding Defects ◽

Welding Defect ◽

Girth Welds ◽

Level 2

In the pipeline construction, the girth welds tend to be the weakness because of defects and microstructure. The importance of suitable assessment of various defects in the weld is not only to prevent the cracks from unstable growth to cause catastrophic accident but also can effectively reduce the weld repair to reduce construction cost. Although many welding defects assessment methods and codes are used in this field, there are many differences among them. In this paper, the welding defect assessment methods, such as API 1104 and BS7910, were studied. The results show the key factors that affect the result of these assessment methods. The application of these methods was also discussed. The results indicate that API 1104 level1 has the highest conservatism, while API 1104 level 2 is next.

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A comparison of high temperature defect assessment methods

Materials at High Temperatures ◽

10.1080/09603409.1998.11689620 ◽

1998 ◽

Vol 15 (3-4) ◽

pp. 337-346 ◽

Cited By ~ 17

Author(s):

G.A. Webster ◽

K.M. Nikbin ◽

M.R. Chorlton ◽

N.J.C. Celard ◽

M. Ober

Keyword(s):

High Temperature ◽

Assessment Methods ◽

Defect Assessment

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Strength Assessment of Corroded Pipelines — Finite Element Simulations and Parametric Studies

International Journal of Structural Stability and Dynamics ◽

10.1142/s0219455417500699 ◽

2017 ◽

Vol 17 (07) ◽

pp. 1750069 ◽

Cited By ~ 5

Author(s):

Chanyalew Taye Belachew ◽

Mokhtar Che Ismail ◽

Saravanan Karuppanan

Keyword(s):

Finite Element ◽

Assessment Method ◽

Assessment Methods ◽

Mechanical Resistance ◽

Safe Operation ◽

Strength Assessment ◽

Defect Assessment ◽

Parametric Studies ◽

Operation Cost ◽

Test Database

Pipelines are one of the most efficient means for transporting hydrocarbons from one point to the other. However, there is a great risk of pipelines operation failure due to the detrimental effects of corrosion. At the point of corrosion, the pipe wall becomes thinner and loses its mechanical resistance. In such cases, reliable defect assessment methods are necessary to decide whether to resume continual operation or to shut down for maintenance or replacement. However, the available assessment methods are over-conservative, which enforce either unnecessary maintenance or premature replacement. Furthermore, the defect assessment methods should not only ensure safe operation, but also optimized operation cost. Therefore, a new assessment method was developed based on the nonlinear finite element (FE) analysis and a parametric study of geometric parameters related to the corrosion defect. The new method was validated with burst test database, which can predict the burst pressure of corroded pipelines with better accuracy and consistency.

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