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Title: Pressure tests on 30-in diameter X65 grade pipes with dent-crack defects
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: 2282s
Date of Publication: 2013-03-01
Price: $25.00 US
Authors: Hossein Ghaednia, Jorge Silva, Sara Kenno, Prof. Sreekanta Das, Rick Wang, and Richard Kania
Abstract: PIPELINES CAN BE exposed to external interference and corrosive environments and, as a result, damage in the form of dents, corrosion, cracks, and gouges can form in the pipe wall. Such damage can reduce the pressure capacity of the pipeline. Combinations of multiple defects could be even more alarming, and provide serious concerns for the line’s safety and operation. One such combination is the formation of a dent and crack together at the same location of the linepipe. This type of defect is called a ‘dent-crack’ defect in this paper. A long-term research programme is currently underway at the University of Windsor to study the influence of various parameters, such as the level of internal pressure, dent depth, dent shape, crack length, and crack depth, on the pressure capacity of 30-in diameter and X65 grade pipes with D/t of 90. From the study completed so far it has been found that the crack depth of 2 mm or smaller does not have much damaging effect on the pressure capacity of this pipe. This paper discusses the test specimens, test set-up, test procedure, and test results obtained from this study.
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