NDLI: Modelling of Dent and Gouges, and the Effect on the Failure Probability of Pipelines

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Seevam, Patricia Lyons, Chris Hopkins, Phil Toft, Malcolm
Copyright Year	2008
Abstract	One of the main causes of the failure, and resulting casualties, in onshore and offshore transmission pipelines is external interference (also known as ‘mechanical damage’, or ‘third party damage’). External interference can result in a dent, a gouge, or a combination of the two. The combination of dents and gouges is a severe pipeline defect. It creates an unstable stress state at the defect root where work hardening and micro-cracking may be present. This can lead to a variety of immediate and delayed failures in pipelines. The available assessment models for a dent containing a gouge contain significant variability which leads to both conservative predictions of failure pressure and wide scatter when compared to test data. Additionally, these models are used extensively in pipeline risk analysis, and the differing models can cause wide variation in pipeline failure frequency predictions. This paper is a critical evaluation of existing dent/gouge models, using the full scale test database from the ‘Pipeline Defect Assessment Manual’ (PDAM). It compares two published methodologies for assessing dents containing gouges to determine the most robust model. The paper then uses probabilistic methods to determine the effect of these models on the probability of pipeline failure in a range of pipeline geometries. The paper ends with a gap analysis on dent and gouge models, and identifies requirements for targeting further research in this area, and also makes recommendations for ‘PDAM’.
Sponsorship	International Petroleum Technology Institute and the Pipeline Division
Starting Page	103
Ending Page	116
Page Count	14
File Format	PDF
ISBN	9780791848586
DOI	10.1115/IPC2008-64061
e-ISBN	9780791838358
Volume Number	2008 7th International Pipeline Conference, Volume 2
Conference Proceedings	2008 7th International Pipeline Conference
Language	English
Publisher Date	2008-09-29
Publisher Place	Calgary, Alberta, Canada
Access Restriction	Subscribed
Subject Keyword	Cracking (materials) Work hardening Pipelines Probability Chisels Risk analysis Modeling Pressure Stress Fracture (process) Databases Electromagnetic scattering Ocean engineering Failure
Content Type	Text
Resource Type	Article

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