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- W2530996155 abstract "Appendix A of sixteenth edition of API standard 1104 allows relaxation of the flaw acceptance criteria, as defined in the standard, provided that specified minimum fracture toughness values are achieved (Ref.1). The fracture toughness is measured using the crack tip opening displacement (CTOD) test procedure as described in BS 5762 published by the British Standards Institute. In allowing relaxed defect acceptance criteria, the achievement of a specified CTOD value ensures that the flaws in girth welds will remain stable during installation and service. Thus, despite the presence of flaws, the pipeline can be operated safely without risk of unstable fracture, e.g. brittle fracture. However, to ensure that this is the case, it is vital that the testing procedure be designed to identify and quantify the lowest toughness region. If this is not done, there is a risk that the flaw will sample low toughness material and initiate an unstable fracture leading to failure of the girth weld. This report describes a research project to investigate different notching techniques with the objective of determining the most appropriate method for selecting the notch location for CTOD specimens notched into the Heat-Affected-Zone (HAZ) region of pipeline girth welds. The intent is to ensuremore » that HAZ fracture toughness testing procedures produce results representative of the HAZ and which can be used safely to permit relaxation of the flaw acceptance criteria allowed in Appendix A of API 1104.« less" @default.
- W2530996155 created "2016-10-21" @default.
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- W2530996155 date "1991-02-18" @default.
- W2530996155 modified "2023-09-27" @default.
- W2530996155 title "Optimizing techniques for CTOD testing of girth welds in linepipe. Final report" @default.
- W2530996155 hasPublicationYear "1991" @default.
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