NDLI: Limit Load Solution and Crack Driving Force Estimation Scheme for Embedded Flaws in Pipeline Girth Welds

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Pépin, Aurélien Tkaczyk, Tomasz O’dowd, Noel Nikbin, Kamran
Copyright Year	2015
Abstract	The acceptability of flaws in a subsea rigid pipeline is usually sanctioned based on the results of an engineering criticality assessment (ECA), carried out considering all loads seen by the pipeline from fabrication to the end of service life. Reel-lay is an efficient installation method, frequently used for installing subsea pipelines. Unlike surface breaking flaws, embedded flaws are not directly assessed in a reeling ECA because the available assessment solutions are too conservative. A work around approach is often used, whereby acceptable surface breaking flaw sizes are deemed acceptable beneath the surface, provided that the embedment depth is equal to or greater than half of the flaw height. However, the results of more recent research work suggest that this approach could be non-conservative in some cases. In this work, a parametric finite-element (FE) study was carried out to assess the effect of the embedment depth, the crack length and the crack height on the load required to cause collapse of the shorter ligament of an embedded flaw. Subsequently, a closed form limit load solution was developed, and compared against available solutions for pipes subjected to tension. A J-based crack driving force (CDF) estimation scheme was developed for a selected material behaviour. Finally, recommendations were made for the direct reeling ECA of subsea pipelines with embedded flaws.
Sponsorship	Pressure Vessels and Piping Division
File Format	PDF
ISBN	9780791856963
DOI	10.1115/PVP2015-45702
Volume Number	Volume 3: Design and Analysis
Conference Proceedings	ASME 2015 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2015-07-19
Publisher Place	Boston, Massachusetts, USA
Access Restriction	Subscribed
Subject Keyword	Collapse Pipelines Service life (equipment) Fracture (materials) Stress Cable reels Welded joints Ocean engineering Tension Finite element analysis Manufacturing Underwater pipelines Pipes
Content Type	Text
Resource Type	Article

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