Magnetic non-destructive evaluation of ruptures of tensile armor in oil risers

Author(s)

Perez-Benitez, J. A. ^[1] ; Padovese, L. R. ^[2]

Affiliation

^[1] IPNESIME SEPI, LENDE, Mexico City 07738, DF - Mexico

^[2] Univ Sao Paulo, Dept Engn Mecan, Escola Politecn, BR-05508900 Sao Paulo - Brazil

• Document type: Journal article
• Source: MEASUREMENT SCIENCE & TECHNOLOGY; v. 23, n. 4 APR 2012.
• Web of Science Citations: 1

Abstract

Risers are flexible multilayered pipes formed by an inner flexible metal structure surrounded by polymer layers and spiral wound steel ligaments, also known as armor wires. Since these risers are used to link subsea pipelines to floating oil and gas production installations, and their failure could produce catastrophic consequences, some methods have been proposed to monitor the armor integrity. However, until now there is no practical method that allows the automatic non-destructive detection of individual armor wire rupture. In this work we show a method using magnetic Barkhausen noise that has shown high efficiency in the detection of armor wire rupture. The results are examined under the cyclic and static load conditions of the riser. This work also analyzes the theory behind the singular dependence of the magnetic Barkhausen noise on the applied tension in riser armor wires. (AU)

• FAPESP's process: 08/10859-0 - Expert System for Magnetic Non Destructive Testing
• Grantee: José Alberto Pérez Benitez
• Support Opportunities: Scholarships in Brazil - Post-Doctoral