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02088 ASSESSMENT OF CORROSION IN LOW TOUGHNESS PIPE MATERIAL

Product Number: 51300-02088-SG
ISBN: 02088 2002 CP
Author: Julia Race and Stephen Peet
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Corrosion is an increasing problem in ageing pipelines world-wide, and the conditions under which a corrosion defect fails have been the subject of extensive world-wide research in the last 30 years. Various organisations have conducted full-scale tests on artificial and real corrosion defects, which have allowed the development of defect assessment criteria. In modern linepipe with high toughness, smooth corrosion defects will fail by ductile initiation and plastic collapse. In this case, the remaining strength of pipelines can be assessed using codified methods. However, for low toughness pipe material the dominant failure mode may be brittle fracture. This is of particular concern in older pipelines, in early Electric Resistance Welded (ERW) welded pipe and pipelines operating at low temperature. In this case, plastic collapse methods may be inappropriate and unconservative and careful consideration must be given to the selection of assessment methods. This paper reviews the available assessment methods for corrosion in low toughness pipe material and demonstrates how these methods are selected and applied to corrosion defects detected in intelligent pig inspections.
Corrosion is an increasing problem in ageing pipelines world-wide, and the conditions under which a corrosion defect fails have been the subject of extensive world-wide research in the last 30 years. Various organisations have conducted full-scale tests on artificial and real corrosion defects, which have allowed the development of defect assessment criteria. In modern linepipe with high toughness, smooth corrosion defects will fail by ductile initiation and plastic collapse. In this case, the remaining strength of pipelines can be assessed using codified methods. However, for low toughness pipe material the dominant failure mode may be brittle fracture. This is of particular concern in older pipelines, in early Electric Resistance Welded (ERW) welded pipe and pipelines operating at low temperature. In this case, plastic collapse methods may be inappropriate and unconservative and careful consideration must be given to the selection of assessment methods. This paper reviews the available assessment methods for corrosion in low toughness pipe material and demonstrates how these methods are selected and applied to corrosion defects detected in intelligent pig inspections.
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