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Title: Defect propagation from fatigue loading in 13%Cr pipelines
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Catalog No.: 2239s
Date of Publication: Sep 1 2011 12:00AM
Price: $25.00 US
Authors: Antoon A Lefevre, Maurits Waaijenberg, Elliot Aylwin, and Hennie M Triel
Abstract: WINTERSHALL NOORDZEE BV is investigating the potentials of a novel installation technique for offshore laying of smaller-diameter pipe as an alternative for reeling known as Easypipe. As part of this feasibility study, the possible adverse effects of fatigue loading during tow-out are being investigated. To that end, full-scale four-point bend-fatigue tests have been performed on welded 13% Cr pipes of 10.75-in diameter and 14.3-mm wall thickness, provided with artificial planar surface defects in the HAZ of the girth welds. For comparison purposes, similar tests have been conducted on a ‘conventional’ CMn (X65) welded pipe. The programme has shown that the fatigue-crack initiation and propagation resistance of the 13% Cr pipes is significantly lower than that of CMn pipes. The reason(s) why fatigue-crack propagation rates are much higher in the HAZ of the 13% Cr pipes could not be identified. It is recommended that further experimental work is performed to elucidate this.
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