Spatial variability of soil resistivity and rational sampling for corrosion assessment of carbon steel in Daqing area |
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| Authors: | Liangshan QU Cuiwei DU Xiaogang LI Jianlong ZHOU |
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| Affiliation: | 1. Corrosion and Protection Center, Institute of Advanced Materials, Ministry of Education Key Laboratory for Corrosion and Protection, University of Science and Technology Beijing, Beijing 100083, China;
2. Oilfield Construction Design & Research Institute, Daqing Oil Limited Company, Daqing 163712, China |
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| Abstract: | Soil resistivity is one of the key indicators of the corrosive classification assessment on metal materials in soil environment. This paper presents variance characters of various quantity of soil resistivity samples data based on the semi-variance function methods of Geo-statistical Analysis by analyzing the regional soil resistivity sampling data in Daqing area. Furthermore, the variance of the soil resistivity as well as entire soil circumstance due to different sampling amounts are also analyzed and compared by means of using the characteristic parameters of the semi-variance function. In addition, this work also studied the rational sampling quantities according to various measurement errors required and evaluated the local soil corrosivity on carbon steel based on the actual measuring data in this area. |
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| Keywords: | Soil resistivity Spatial variability Sampling Corrosion of carbon steel |
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