Main target for expanding the possibilities of SCR (steel caternary riser) application is the development of optimized setup and welding parameters which lead to a significant fatigue life enhancement. PURE (premium upset riser ends) is a ready for service solution for on- and offshore applications developed by V&M (Vallourec & Mannesmann) Tubes and qualified in cooperation with TWI (The Welding Institute). It provides among others an assured pipe end match, minimum stress concentration factors as well as an unaffected media flow. This paper will highlight the key activities of design development and qualification. The design benefit and the welding technology on property profile were determined by comparing the results of PURE design with plain ends. FEM calculations were used to investigate the influence of design parameters on SCF (stress concentration factor). A specific GMAW (gas metal arc welding) technology was applied as joining technology. Complex heat treatment and an optimized chemical composition resulted in an assured X-65 over the entire upset end line pipe. The testing program comprised besides mechanical testing and all weld test on girth weld and HAZ, resonance full scale fatigue tests of single weld pipes to determine fatigue life and location of failure (post mortem investigation).
PURE (premium upset riser ends): Expanding the possibilities of SCR application
2010
8 Seiten, 3 Quellen
Aufsatz (Konferenz)
Englisch
Expanding possibilities for miniaturisation
Emerald Group Publishing | 2004
Engineering Index Backfile | 1952