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©2010 BlueScope Steel is a registered trademark of BlueScope Steel Limited. ABN 16 000 011 058. You can rely on Australia’s experts in steel Page 1 WELDING THE FIRST ERW X80 GRADE PIPELINE Barbaro F J, Bowie G F and Holmes W ABSTRACT Pipeline materials and construction costs are the most significant components of major transmission pipelines. In Australia these costs have been contained over the past two decades by the utilisation of high strength thin walled pipe. API 5L X70 grade pipe is common place and 13km of X80 grade pipe has been installed in a looping section of the Roma - Brisbane pipeline. The aim of the Roma - Brisbane looping project was to fully evaluate the economic benefits associated with the use of 8.8mm thick, 406mm diameter X80 grade pipe. The evaluation involved development of weld procedures using both the conventional cellulosic manual metal arc (MMA) process and a mechanised gas metal arc welding (GMAW) system to determine the influence of weld metal strength on allowable girth weld defect tolerance. Although currently available cellulosic consumables have been shown to undermatch the strength of X80 pipe, the full section pipe tension test demonstrated tolerance to both Tier 1 and Tier 2 girth weld defect allowances. These results support recent research which has shown that the tolerable level of weld metal strength undermatching is related to the pipe wall thickness and the defect depth assumption Weld metal strength matching with an appropriate level of toughness was shown using engineering critical assessment procedures to provide increased defect tolerance. Defect tolerance under axial yield stress loading is more accurately determined using destructive test methods. KEYWORDS Pipelines, X80, GMAW, Cellulosic, Full section pipe tension test, Defect acceptance, ECA, Destructive test. AUTHOR DETAILS Frank J Barbaro, Chief Development Officer and Graham F Bowie, Senior Development Officer, BHP Steel Flat Products, Port Kembla Steelworks, New South Wales and William Holmes, Technology Manager Pipeline & Coatings, Agility Team Build, Fyshwick Canberra, ACT First published in the proceedings of the Welding Technology Institute of Australia International Conference on ‘Pipeline Construction Technolog’, 4-5 March 2002, Novotel North Beach, Wollongong, Australia. STEEL FOR PIPELINES
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