DBPapers
DOI:10.5593/SGEM2013/BC3/S12.056

WATER QUALITY - MONITORING OF CORROSION LOSSES AND CORROSION RATE IN WATER PIPES

V. Dubova, M. Sokac
Monday 5 August 2013 by Libadmin2013

References: 13th SGEM GeoConference on Water Resources. Forest, Marine And Ocean Ecosystems, www.sgem.org, SGEM2013 Conference Proceedings, ISBN 978-619-7105-02-5 / ISSN 1314-2704, June 16-22, 2013, 441 - 448 pp

ABSTRACT

Water pipes in municipal and industrial distribution systems are often constructed of metal tubes, which beside to its good properties has also tendency to corrosion. Occurrence of corrosion processes affect significantly not only the pipe life-time, reliability of the whole supply system, it’s failure rate, but also changes hydraulic behaviour of the water supply system and may result in poor water quality.
Increase of the water price water caused a water consumption decrease and thus the travel time extension of the water in distribution system. This also influences the interaction of the transported water and pipe material. For the reasons, stated above, we observed the corrosive effect of the water from water source Pernek on the pipe with the short- and long- term corrosion tests. Tests are based on measurements of the weight loss difference of the test sample after 30 and 60 day exposure to flowing water. Since short time (30-60 day) test does not always give an accurate picture of the interaction between water and pipe, we extend the test up to two years. During these long term test we have observed not only the corrosion losses and the corrosion speed, but also the formation of the corrosion layer and its thickness.
Corrosion losses between 30 and 60 day were almost in linear course, but during longer tests corrosion losses speed decreases and the average corrosion rate for 2-year test reached only about 39% of the corrosion rate determined from short term tests. The paper presents measured temporal changes of corrosion losses after statistical processing.

Keywords: corrosion of water pipes, corrosion rate, corrosion losses, corrosion layer