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Title: A dynamic boundary ductile-fracture-propagation model for CO2 pipelines
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Catalog No.: 2217s
Date of Publication: Dec 1 2010 12:00AM
Price: $25.00 US
Authors: Prof. Haroun Mahgrefteh, Solomon Brown, and Peng Zhang
Abstract: THE DEVELOPMENT and testing of a dynamic boundary ductile-fracture-propagation model for pressurized CO2 pipelines is presented. The model accounts for all the important fluid-structure interactions governing the fracture process. These include expansion-wave propagation, real fluid behaviour, pipe/wall fiction, and heat transfer, as well as the rapidly diminishing dynamic loading effects as the crack tip opens. The resistance to crack-tip propagation is determined based on the drop-weight tear test energy approach. The performance of the fracture model is tested by comparison of its predictions of the crack-propagation velocity versus crack length against real data. The latter include the High-Strength Line Pipe Committee, ECSC X100 and Alliance full-scale burst tests conducted for pipes containing either air or rich gas mixtures. In all cases good agreement is obtained between the model predictions and the real data. The validated model is used to test the propensity of a hypothetical but realistic pressurised CO2 pipeline to ductile fracture propagation failure. The simulations indicate the remarkably significant role of the starting line temperature on fracture propagation in CO2 pipelines.
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