Girth weld failure by plastic collapse is often viewed more likely than brittle fracture in modem pipelines, where material toughness is typically 'high'. Selection of an appropriate plastic collapse solution is often difficult partly due to the 'over-abundance' of the available solutions, but also because there is often very limited information on the applicable range of these solutions. This paper focuses on plastic collapse solutions relevant to the girth welds of gas transmission pipelines containing surface-breaking circumferential defects. A total of nine plastic collapse solutions are reviewed and compared with available experimental data. Both pure bending and the combined internal pressure and bending are considered. It was found that experimental data relevant to large D/t pipes containing relatively long circumferential defects are few, although there is a large number of experimental data of pipes with smaller D/t ratios from the stand point of typical gas transmission pipelines. The review of the experimental data shows that more tests are needed if the defect length greater than 10% of the circumference were to be allowed in gas transmission pipelines.
Plastic collapse analysis of pipelines containing surface-braking circumferential defects
Analyse des plastischen Zusammenbruchs von Pipelines mit oberflächenunterbrechenden Rundnahtdefekten
2000
19 Seiten, 4 Bilder, 10 Tabellen, 44 Quellen
Conference paper
English
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