Volume 5, Issue 3, September 2020, Page: 47-56
A Classification Approach for Corrosion Rating of Soil to Buried Water Pipelines: A Case Study in Budhanilkantha-Maharajganj Roadway Areas of Nepal
Abiral Poudel, Central Department of Chemistry, Tribhuvan University, Kirtipur, Nepal
Kumar Prasad Dahal, Central Department of Chemistry, Tribhuvan University, Kirtipur, Nepal
Dinesh K. C., Central Department of Chemistry, Tribhuvan University, Kirtipur, Nepal
Jagadeesh Bhattarai, Central Department of Chemistry, Tribhuvan University, Kirtipur, Nepal
Received: Aug. 13, 2020;       Accepted: Aug. 24, 2020;       Published: Oct. 22, 2020
DOI: 10.11648/j.wjac.20200503.12      View  68      Downloads  28
Abstract
The present study was focused to estimate six characteristics of soil specimens taken from 0.3 to 1.5 m sampling depth of six sampling sites of Budhanilkantha-Maharajganj roadsides using standard methods, and was assessed their corrosive nature to the buried-metallic pipelines using an empirical corrosion rating model. The estimated soil pH, moisture, resistivity, redox potential (ORP), chloride and sulfate ions were 6.4-7.9, 7-45%, 4.5 × 103-45.5 × 103 Ohm. cm, 317-514 mV (SHE), 12-86 ppm, and 40-294 ppm, respectively, in all the soil sample specimens. The experimental results indicated that the soils could be rated as mildly corrosive to less corrosive groups to the buried galvanized-steel and cast iron pipes in the study areas. A good positive or negative correlation coefficient between resistivity, moisture, chloride and sulfate contents implies that these soil parameters have an equal contribution to the rating of soil corrosivity. A polyethylene-sheet wrapping (i.e., encasement) around the galvanized-steel and cast iron water pipelines or the use of non-conducting materials of gravel/sand around the burying ground could be sufficient for the extension of their life up to 50 years or more. The empirical model is successfully applied for the corrosion rating of soil samples and could be progressive in the future for soil corrosion rating of soils to the underground waterworks. Present findings would be insightful and suggestive in making the corrosive land maps of the studied areas which would be helpful for the potable water pipeline works in other urban areas of Nepal.
Keywords
Buried-pipelines, Empirical Model, Salt Ions, Soil Resistivity, Sub-corrosive Group, Water Amount
To cite this article
Abiral Poudel, Kumar Prasad Dahal, Dinesh K. C., Jagadeesh Bhattarai, A Classification Approach for Corrosion Rating of Soil to Buried Water Pipelines: A Case Study in Budhanilkantha-Maharajganj Roadway Areas of Nepal, World Journal of Applied Chemistry. Vol. 5, No. 3, 2020, pp. 47-56. doi: 10.11648/j.wjac.20200503.12
Copyright
Copyright © 2020 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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