NDLI: Ultra Heavy Wall Linepipe X65: Double Joint Girth Weld Performances for Severe Applications

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Vito, Luigi Di Mannucci, Gianluca Morana, Roberto Lucci, Antonio Tintori, Federico Crippa, Stefano Armengol, Mariano Mota, Noe´ Pelcastre, Mauricio Ruiz, Eduardo Quintanilla, He´ctor Darcis, Philippe
Copyright Year	2011
Abstract	Tenaris and Centro Sviluppo Materiali (CSM) launched a Joint Industrial Project aimed at developing heavy wall line pipes. The suitability for very severe applications, involving high service pressures and temperatures, the latter causing large strain fluctuations, in presence of an aggressive sour environment, is analyzed both theoretically and experimentally, including small and full scale pipe models. The full project program aims at developing a new generation heavy wall product, supported by: comprehensive laboratory analysis of the material response under severe mechanical loading in aggressive environment; and full scale testing program, including both pipe and girth weld. Both investigations are mainly addressed to the basic understanding of impact on design criteria from interaction between severe loading and aggressive environment. Three papers have been already presented, in previous OMAE conferences, on this project. In the present paper, main outcomes of laboratory testing activities of the above program on girth welds for double jointing (fill passes by Submerged Arc Welding) are reported. A fitted for purpose special testing program, including mechanical and SSC laboratory scale testing, has been executed. Full thickness longitudinal specimens were extracted crossing girth weld to apply severe strain cycling. The strain cycling has been defined as extreme in terms of resistance against ratcheting for the pressurized pipeline, as deduced in a work reported in one of the previously mentioned papers. The girth welds exhibited very satisfactory performance during severe cyclic straining. Furthermore, mechanical and stress-corrosion properties of the As-Weld girth joint have been compared with the corresponding properties after severe straining and ageing. This comparison highlighted high level of mechanical and SSC resistance, even after the application of severe straining and ageing.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	617
Ending Page	626
Page Count	10
File Format	PDF
ISBN	9780791844366
DOI	10.1115/OMAE2011-49715
Volume Number	Volume 4: Pipeline and Riser Technology
Conference Proceedings	ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2011-06-19
Publisher Place	Rotterdam, The Netherlands
Access Restriction	Subscribed
Subject Keyword	Design Welded joints Temperature Fluctuations (physics) Pressure pipes Stress corrosion cracking Arc welding Performance Pipes Testing
Content Type	Text
Resource Type	Article

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