NDLI: Advanced Engineering Critical Assessments of Seam Weld Features in Pressure Cycled Hazardous Liquid Pipelines

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Spencer, Kevin Santamaria, Wilson Dawson, Jane Lu, Hong
Copyright Year	2008
Abstract	The performance of older ERW pipelines has raised concerns regarding their ability to reliably transport product to market. Low toughness or “dirty” steels combined with time dependent threats such as surface breaking defects, selective corrosion and hook cracks are especially of concern in hazardous liquid pipelines that are inevitably subject to cyclic loading, increasing both the probability and rate of crack growth. The existing methods of evaluating seam weld flaws by hydrostatically testing the pipeline or In-Line Inspection (ILI) with an appropriate technology are well established. Hydrostatic testing, whilst providing a quantified level of safety is often impracticable due to associated costs, logistics and the possibility of multiple failures during the test. ILI technologies have become more sophisticated and as a result can accurately detect and size both critical and sub-critical flaws within the pipeline. However, the vast amounts of data generated can often be daunting for a pipeline operator especially when tool tolerances and future growth are required to be accounted for. For either method, extensive knowledge of the benefits and disadvantages are required to assess which is the more appropriate for a particular pipeline segment. This paper will describe advances in the interpretation of seam weld flaws detected by ILI and how they can be applied to an Integrity Management Plan. Signal processing improvements, validated by in-field verifications have enabled detailed profiles of surface breaking defects at seam welds for ERW pipelines to be determined. Using these profiles along with established fracture and fatigue analysis methods allows for reductions in the unnecessary conservatism previously associated with the assessment of seam weld flaws detected by ILI. Combining these results with other available data, e.g. dig verifications, previous hydrostatic testing records, enables more realistic and better-informed integrity and maintenance planning decisions to be made. A real case study conducted in association with a pipeline operator is detailed in the paper and quantifies the benefits that can be realised by using these advanced assessment techniques, to safely and economically manage their assets going forward.
Sponsorship	International Petroleum Technology Institute and the Pipeline Division
Starting Page	471
Ending Page	479
Page Count	9
File Format	PDF
ISBN	9780791848586
DOI	10.1115/IPC2008-64312
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	Pipelines Inspection Probability Fracture (materials) Maintenance Appropriate technology Fatigue analysis Steel Pressure Fracture toughness Welded joints Corrosion Hydrostatic testing Signal processing Safety Failure Logistics Testing
Content Type	Text
Resource Type	Article

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Validation of Fatigue Models for ERW Seam Weld Cracking

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