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

2002 ◽  
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?

Application of State of the Art Assessment for Pipeline Girth Weld

2017 ◽  
Vol 898 ◽  
pp. 1063-1068
Author(s):  
Deng Zun Yao ◽  
Zhi Wen Li ◽  
Jian Wu Liu ◽  
Lin Chen
Keyword(s):  
State Of The Art ◽  
Axial Stress ◽  
Construction Cost ◽  
Assessment Methods ◽  
Weld Repair ◽  
Defect Assessment ◽  
Weld Defect ◽  
Key Points ◽  
Welding Defects ◽  
Girth Welds

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.

Improvement of Probabilistic Fracture Mechanics Analysis Code PASCAL-SP With Regardto PWSCC

2019 ◽  
Vol 5 (3) ◽  
Author(s):  
Akihiro Mano ◽  
Yoshihito Yamaguchi ◽  
Jinya Katsuyama ◽  
Yinsheng Li
Keyword(s):  
Fracture Mechanics ◽  
Failure Probability ◽  
Power Plants ◽  
Crack Detection ◽  
Structural Integrity ◽  
Energy Agency ◽  
Pressurized Water ◽  
Integrity Assessment ◽  
Probabilistic Fracture Mechanics ◽  
Failure Probabilities

Probabilistic fracture mechanics (PFM) analysis is expected to be a rational method for structural integrity assessment because it can consider the uncertainties of various influence factors and evaluate the quantitative values such as failure probability of a cracked component as the solution. In the Japan Atomic Energy Agency, a PFM analysis code PASCAL-SP has been developed for structural integrity assessment of piping welds in nuclear power plants (NPP). In the past few decades, a number of cracks due to primary water stress corrosion cracking (PWSCC) have been detected in nickel-based alloy welds in the primary piping of pressurized water reactors (PWRs). Thus, structural integrity assessments considering PWSCC have become important. In this study, PASCAL-SP was improved considering PWSCC by introducing several analytical functions such as the models for evaluation of crack initiation time, crack growth rate (CGR), and probability of crack detection. By using the improved version of PASCAL-SP, the failure probabilities of pipes with a circumferential crack or an axial crack due to PWSCC were numerically evaluated. Moreover, the influence of leak detection and nondestructive examination (NDE) on failure probabilities was detected. Based on the obtained numerical results, it was concluded that the improved version of PASCAL-SP is useful for evaluating the failure probability of a pipe considering PWSCC.

Texture Analysis for Crack Detection in Fracture Mechanics

2018 ◽  
Vol 18 (3) ◽  
pp. 526-537
Author(s):  
Fernando A. Fardo ◽  
Gustavo H. B. Donato ◽  
Paulo S. Rodrigues
Keyword(s):  
Fracture Mechanics ◽  
Texture Analysis ◽  
Crack Detection

Review of Defect Distributions for Probabilistic Structural Integrity Assessment

2002 ◽  
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.

scholarly journals E25 Proposal of Defect Assessment Methods in New Mg Casting Alloy

2008 ◽  
Vol 2008.61 (0) ◽  
pp. 155-156
Author(s):  
Ryota EGASHIRA ◽  
Shigeru HAMADA ◽  
Hiroshi NOGUCHI
Keyword(s):  
Assessment Methods ◽  
Casting Alloy ◽  
Defect Assessment

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

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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