Describes the principal types of problems that pipeline operators can expect to have with pipelines comprised of older pipe materials with electric resistance welded (ERW) seams. It also provides some suggestions for continuing to operate such…
A review of the quality of' some manufacturers' ERW welding processes and the future reliability of pipeline segments containing defective ERW seam welds. This technical report, which is based on the OPS accident information database and other…
The PRCI project IM-3-1 "Performance Capabilities Evaluation of ILI for Long Seam Features in ERW Pipe" is part of an integrated multi-year, multi-phased program and systematic approach for evaluating the performance capabilities and limitations of…
While the general fracture mechanics methodology for calculating fatigue lives is well documented and validated, its application in the definition of pipeline system fatigue lives have differed from field experience. The source and magnitude of the…
Postweld heat treatments originally were applied to improve the strength and toughness of the weld. Recent information has indicated that postweld heat treatments also can have a significant effect on the resistance of the weld line to selective…
A notched-tensile test procedure was developed that requires two test specimens, a side-notched transverse flattened strap and an unnotched axial specimen. The weld ductility is defined in terms of the ratio of the notched to unnotched tensile…
The objective of this research project was to determine the fatigue characteristics of the weld zone of electric resistance welded (ERW) pipe. The project involved: (1) characterizing pipe samples in terms of initial defects, tensile and yield…
This report describes in full detail the calculations used by KAI in its software product PIPELIFE which is used to calculate fatigue crack-growth life. The results of analyses performed for standard benchmark cases supplied by PRCI were reported for…
The general fracture mechanics based approaches to estimating fatigue life are well established and have been available for some time. Application of these methods are used in various software which utilize slightly different approaches (i.e.,…