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Structural integrity of circumferential welded joints in pipelines and risers

Grant number: 09/54229-3
Support Opportunities:Regular Research Grants
Duration: May 01, 2011 - October 31, 2013
Field of knowledge:Engineering - Naval and Oceanic Engineering - Marine and Ocean Structures
Principal Investigator:Claudio Ruggieri
Grantee:Claudio Ruggieri
Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil


The technological challenges for oil and gas drilling and production in the newly discovered Pre-Salt layer are enormous and have strongly motivated the development of more efficient and yet innovative offshore production systems capable to meet the complex and stringent design and operation requirements for ultradeep waters. Within this scenario, the riser system for oil and gas export from the well head to the floating production unit plays a key role in ensuring high levels of structural integrity and safe operation of the offshore infrastructure. This research plan addresses a numerical and methodological investigation of strength mismatch effects on the fracture behavior of circumferential welded joints for risers and pipeline systems. The approach is further extended to defect assessment procedures in such structural components based on the ECA methodology. A central objective is to develop more advanced and yet more accurate defect assessment procedures which are applicable to riser installation by the reeling method. The project is divided into 04 subtasks as follows: i) SET-SOL - Development of SE(T) fracture specimens applicable to fracture testing of weldments; ii) JCRISER - Evaluation of J and CTOD crack driving forces for welded joints in risers containing circumferential defects; iii) ACRSOL - Critical engineering assessments of welded joints in risers e iv) FRACTOOL - Development of the research code FracTool. (AU)

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Scientific publications (5)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DE SOUZA, RODOLFO F.; RUGGIERI, CLAUDIO. J-dominance and size requirements in strength-mismatched fracture specimens with weld centerline cracks. Journal of the Brazilian Society of Mechanical Sciences and Engineering, v. 37, n. 4, p. 1083-1096, . (09/54229-3)
PAREDES, MARCELO; RUGGIERI, CLAUDIO. Further results in J and CTOD estimation procedures for SE(T) fracture specimens - Part II: Weld centerline cracks. ENGINEERING FRACTURE MECHANICS, v. 89, p. 24-39, . (09/54229-3)
SAVIOLI, RAFAEL G.; RUGGIERI, CLAUDIO. J and CTOD estimation formulas for C(T) fracture specimens including effects of weld strength overmatch. INTERNATIONAL JOURNAL OF FRACTURE, v. 179, n. 1-2, p. 109-127, . (09/54229-3)
RUGGIERI, CLAUDIO. Further results in J and CTOD estimation procedures for SE(T) fracture specimens - Part I: Homogeneous materials. ENGINEERING FRACTURE MECHANICS, v. 79, p. 245-265, . (09/54229-3)
MATHIAS, LEONARDO L. S.; SARZOSA, DIEGO F. B.; RUGGIERI, CLAUDIO. Effects of specimen geometry and loading mode on crack growth resistance curves of a high-strength pipeline girth weld. INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING, v. 111, p. 106-119, . (09/54229-3)

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