Additionally, non-destructive tests, Charpy-V impact tests and metallographic characterization were undertaken. The welded joints produced were evaluated according to the API 1104 specification, which requires: side bend, nick- break and tensile tests. The fill and cap passes were executed with E-10018-G electrodes. The hot pass, applied over the root pass, was performed with an E-9010-G electrode. The root pass was carried out with an E-6010 electrode to avoid incomplete joint penetration. Three types of electrodes were utilized for the basic tasks the root pass, the hot pass and fill and cap passes.
The current stage of this program involves the characterization and performance evaluation/qualification of girth welds produced by Shield Metal Arc Weld (SMAW) under simulated field conditions, with tubes fixed in the horizontal position. E-mail: present work is a part of an extensive program for the development of API 5L Gr.X80 grade steel, produced by the well-known UOE production process, for pipeline fabrication. (author)Ĭircumferential welding of API X80 steel pipes Soldagem circunferencial em tubos de aco da classe API X80Ĭastello Branco, J.F. Difficulties were detected regarding construction and assembly stage and showing the need of revision of PETROBRAS standard N-464. Regarding API 5L-X80 pipe fabrication, the obtained results were reported, proving that this aspect was already overcome, showing the viability of its production in Brazil. An evaluation of the expected gains when choosing API 5L Grade X80 steels were done, regarding reduction of costs and pipe weight. At the design stage, a comparison between pipelines designed using API 5L-X70 and API 5L-X80 was carried out approaching the aspects of variation of thickness, pressure design and design factor. H - 2004 Dec) and the experience consolidated in pipelines construction abroad were presented.
The implications in cost, productivity, inspection and integrity, with the application of these high resistance steels, complying with PETROBRAS Standard N - 464 Construcao, Montagem e Condicionamento de Dutos Terrestres (Rev. In the pipeline construction point of view, the use of line pipes API 5L Grade X80 provide some advantages, however some difficulties must be expected in several stages of the construction and assembly. The use of line pipes API 5L Grade X80, at the point of view of designer allows: reduction of wall thickness and pipe weight or increase of design pressure. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil) X80Įnergy Technology Data Exchange (ETDEWEB) Construction and assembly of pipelines using API 5L grade X80 tubes - considerations to be observed with high-strength steels Construcao e montagem de dutos terrestres utilizando tubos API 5L Gr.
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