Development of an ultrasonic corrosion probe


Corrosion monitoring is one of the most efficacious mechanisms that allow controlling the integrity of pipelines and its application is required by international standards in several situations. The ordinary technology used in corrosion probes, like mass coupons, has some limitations regarding costs and QHSE issues; it leads to the development of alternative technologies. In the case of subsea pipelines, the use of the traditional coupons is limited to the “topside” section of the pipelines, usually in its beginning and end. It restrains the process of integrity assurance in subsea pipelines. This paper describes the development of an ultrasound system of high sensibility to overcome these limitations. It is called “PROVUS” and it is able to estimate corrosion rates very accurately. This system presents many advantages when compared to the traditional coupons, such as: they are non-intrusive, easy to handle/deploy, safer and more flexible. This paper details the present stage of development of the ultrasonic corrosion probe, detailing: the validation process by means of over 6000 hours of “blind tests”, i.e., tests in which the applied corrosion rate was only informed after its detection by the ultrasonic system; the applications for onshore and subsead pipelines; the mechanical design and the adjusts in course to turn the tool suitable for ROV (Remotely Operated Vehicle) operation.

PATUSCO, Carlos A. P.; CAMERINI, Claudio S.; ADAMOWSKI, Júlio C.; BUIOCHI, Flávio; SUSUKI, Marcos S. T.; ALMEIDA, Neusvaldo Lira de. Development of an ultrasonic corrosion probe. In: OFFSHORE TECHNOLOGY CONFERENCE, 2013, Rio de Janeiro. Procededings… OTC903. 13 p.

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