Czasopismo | OCHRONA PRZED KOROZJĄ | Rocznik 2013 - zeszyt 8

Specifi c protection of pipeline against stray d.c. currents using high quality insulating coatings

nr katalogowy: 78721

Stray d.c. current infl uence on pipe/soil potential in pipelines coated with high quality insulating coatings is specifi c. When measuring on-potentials (Eon) along the pipeline, it can be concluded that the infl uence of stray currents is spread over a large area. However, there is usually no current fl ow between the pipeline and the soil, because of the general lack of coating defects. The values and the pattern of changes in the stray current depend, among others, on the distance between the reference electrode and the coating defect. Interference assessment is diffi cult and using the conventional correlation technique may lead to faulty conclusions that there is a risk of corrosion, when in fact there is none. On the other hand, new opportunities have emerged in the area of corrosion protection of such pipelines, including interaction characteristics modulation. Keywords: pipeline, coating, cathodic protection, casing, stray current.1. Introduction The issued described in the abstract above will be discussed on the basis of a particular pipeline. In November 2012, the construction of an important pipeline was completed in Gdansk Pomerania. The pipeline connects the national transmission system built at the Bay of Puck with an underground gas storage cavern. Many interesting measures have been employed to protect the pipeline against corrosion, which the authors mentioned in their earlier papers [1-5], making the pipeline very unique, at least compared to other technologies used in Poland. The DN500, MOP 8.4 MPa 22.4 km pipeline has been laid on moraininc hills of the Tri-City Landscape Park and on the low-lying wetlands of the Kashubian Urstromtal. The pipeline also lies in the city of Gdansk itself, in an urban area, including an area close to a large shopping centre. The potential risk of pipeline corrosion along most of its parts is very signifi cant. These hazards mainly include stray anodic current interactio[...]

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