The West-East Pipeline is the first high pressure, high-grade steel (X-70) large-diameter (1,016 mm; 40-inch) gas transmission pipeline in China. Previous study had shown that the strength mismatch between girth weld and pipe material greatly affects the integrity of the pipeline. Overmatch has been preferred for low-grade pipeline (X-60 or less). For higher strength steel pipe, undermatching has been recommended to reduce the sensitivity to cold cracking, HIC (hydrogen-induced cracking), and SCC (stress corrosion cracking). This article is based on mechanical tests for the effect of different mismatched girth welds used on the West-East Pipeline. The study indicated that mismatches girth welds affect such properites of the line pipe as limit load, fracture toughness, and treshold defect sizes. Based on the research results, some advice for design, maintenance, and repair of the pipeline is presented.
Study for West-East gas pipeline shows safety benefits of overmatched girth welds
Sicherheit bei Umfangsschweißungen bei der Ost-West-Pipeline in China
Oil and Gas Journal ; 101 , 10 ; 62-65
2003
4 Seiten, 6 Bilder, 2 Tabellen, 9 Quellen
Article (Journal)
English
Pipeline , Umfang , Schweißung , Korrosion , Sicherheit
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