Application os stray current mapper technique in study of corrosion in buried pipeline influenced by interference current

Abstract:

Stray currents circulating in the ground, when find metallic structures buried are captured by these structures and driven by them, up to point of return of the circuit. These currents can be dynamic or static and are able to promote serious damage to structures, classified as stray current corrosion. The precise mapping of these currents can guide more effective mitigation measures. The SCM (Stray Current Mapper) is a non-intrusive technique based on the principle that the current flowing in the conductor is associated with a magnetic field. Thus, in the case of buried pipelines, knowing the magnetic field in the duct, it is possible to obtain information about the intensity and direction of current and to identify possible sources of interference, as well as the entry point current and output. In addition, this technique can be useful for evaluating the efficiency of cathodic protection systems and whether the ducts are connected or not, discover the boundary of the current injected by the rectifiers and if third structures are also protected by the cathodic protection systems of a particular structure. In this work, experimental applications in petroleum transportation pipelines and derivatives under the influence of static and dynamic interference currents will be discussed.


Reference:
ALMEIDA, Neusvaldo Lira de; PIMENTA, G S.; LAURINO, E W.; ALMEIDA, Marcio Bispo de; MAGYAR, Paulo. Application of stray current mapper technique in study of corrrosion in buried pipeline influenced by interference current. In: RIO PIPELINE CONFERENCE & EXPOSITION, 2015, Rio de Janeiro. Proceedings… IBP 1277-15. 6 p.

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