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- Title
Defect propagation from fatigue loading in 13%Cr pipelines.
- Authors
Lefevre, Antoon A.; Waaijenberg, Maurits; Aylwin, Elliot; Triel, Hennie M.
- 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.
- Subjects
PIPELINES; MANUFACTURING defects; MATERIAL fatigue; FEASIBILITY studies; WELDING
- Publication
Journal of Pipeline Engineering, 2011, Vol 10, Issue 3, p181
- ISSN
1753-2116
- Publication type
Article