INVESTIGADORES
OSELLA Ana Maria
artículos
Título:
CORROSION RATES IN BURIED PIPELINES DUE TO GEOMAGNETIC STORMS
Autor/es:
OSELLA, A.,; FAVETTO, A.; LÓPEZ, ERNESTO
Revista:
CORROSION
Editorial:
NATL ASSOC CORROSION ENG
Referencias:
Año: 1999 vol. 55 p. 699 - 705
ISSN:
0010-9312
Resumen:
Telluric effects associated to geomagnetic field variations cause currents to flow in buried pipelines, and this presents a continuing problem to monitoring cathodic protection. Protection methods, involving the application of a non-corrosive coating together with a cathodic protection, should present the circulation of erratic currents. Nevertheless, often these currents can not be compensated. During days of high geomagnetic activity an excess of current, which cannot be drained, circulates along the pipe. This effect has a strong dependence on the electrical resistivity of the host soil , produces a strong current channeling along the pipes and increases the risk of corrosion. Within this frame, a method is proposed to quantify the corrosion effects over the pipelines, assuming the geomagnetic field as the external source responsible for the erratic currents. Non-disturbed fields and geomagnetic storms are modeled and pipeline currents are calculated as a function of the characteristics of the soils and pipe sizes, using a numerical code previously developed. Finally, taking into account the statistical distribution of geomagnetic storms, the increase in corrosion rates associated to cumulative effects is estimated