Detecting failures of flexible multistrand steel structures

Details Detecting failures of flexible multistrand steel structures Detecting failures of flexible multistrand steel structures

G - Physics

01

N

G01N 27/82 (2006.01) G01N 27/83 (2006.01)

Patent

CA 2534769

A flexible elongate structure, such as a flexible riser (10), comprising at least one layer (20) of steel wires near the surface which extend at least partly along the length of the structure, can be monitored by inducing a small, alternating magnetic field in the steel wires using an electromagnetic coil, and monitoring the magnetic flux density near the surface of the structure so as to asses the stress and hence detect if any wires have broken. By using an array of stress-measuring electromagnetic probes (24) around the structure some spatial resolution can be provided as to the location of any break in the wires.

L'invention concerne une structure allongée flexible telle qu'un tuyau flexible de montée (10), comprenant au moins une couche (20) de fils d'acier à proximité de la surface qui s'étend au moins partiellement le long de la structure. Cette structure peut être surveillée par l'induction d'un faible champ magnétique alternatif dans les fils d'acier à l'aide d'une bobine électromagnétique, et la surveillance de l'intensité du flux magnétique à proximité de la surface de la structure pour évaluer la charge et donc détecter l'éventuelle rupture de fils. L'utilisation d'un réseau de sondes électromagnétiques (24) mesurant la charge et situées autour de la structure, permet d'obtenir une résolution spatiale permettant de localiser toute rupture des fils.

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