This paper presents the design and qualification work undertaken for the development of seamless and weldable X-65 grade riser sections with thick upset ends. This is one of the four solutions developed and qualified in a JIP during 2004 to 2007. The development effort focused on their application as a design solution for fatigue improvement at the touch down zone (TDZ) of a steel catenary riser (SCR). The manufacturing of riser sections with thick upset ends with weldable properties provided challenges, and required specific set of tooling and considerations in chemical composition, manufacturing and heat treatment processes to obtain the required performance. The proof of weldability of very thick upset ends was done as per API RP 2Z procedures, and welding procedures were developed with select weld consumables, weld type, and surface conditioning for use in full scale fatigue tests. TenarisTamsa undertook manufacturing of samples and qualification testing program for two 273.1 mm outer diameter (10.75'' OD) production riser cases with varying thickness and performance requirements for upset ends, per JIP case studies for applications in deepwater Gulf of Mexico and West of Africa. The design development and qualification work included alloy design, upsetting tool design, development of a welding procedure specification, definition of industrial manufacturing route, conventional destructive, fracture mechanics and corrosion testing, girth welds fabrication for qualification and for full scale fatigue tests. These are summarized and key results and findings are presented for two cases. Through this effort the feasibility of upsetting riser sections with very thick ends and their weldability and fatigue performance have been proven. In addition, an improved procedure for onshore/shop welds at thick upset ends has been qualified with its ability to significantly increase the fatigue performance. The Technology Readiness Level (TRL) of this solution has been improved and it is available for use in deepwater projects.


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    Titel :

    Qualification of weldable X65 grade riser sections with upset ends to improve fatigue performance of deepwater steel catenary risers


    Weitere Titelangaben:

    Qualifizierung schweißbarer X65-Riser-Sektionen mit gestauchten Enden zur Verbesserung der Ermüdungsfestigkeit von Stahlketten-Risern für den Tiefwasserbereich


    Beteiligte:
    Izquierdo, Alfonso (Autor:in) / Aggarwal, Rajiv (Autor:in) / Quintanilla, Hector (Autor:in) / Garcia, Enrique (Autor:in) / Lopez, Victor (Autor:in) / Richard, Gilles (Autor:in) / Marques, Elsa (Autor:in) / Dell'Erba, Diego (Autor:in) / Vito, Luigi Di (Autor:in)


    Erscheinungsdatum :

    2008


    Format / Umfang :

    9 Seiten, 19 Bilder, 6 Tabellen, 11 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




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