(677g) Investigation of Soil Corrosive Effect on Buried Gas Pipeline: New Correlation Development

One important category of transportation infrastructure is underground pipelines. Corrosion of theseburied pipeline may cause pipeline failures with the attendant hazards of property loss andfatalities. Therefore, developing the capability to estimate the soil corrosivity is important for designing and preserving materials. In this work, corrosion behavior of pipelines buried in soil for Fars province in Iran was investigated. Influence of parameters such as electrical resistivity, pH, structure and composition of soil on the corrosion behavior of buried pipeline were studied. Thus, a new standard criteria methodology has been proposed, illustrated, and validated for the analysis of external corrosion of buried pipelines which they were coated by three type of coating e.g., Coal-tar, three-layer polyethylene and Bituseal. It was noted that this method for soil corrosivity is directly based on Dechema lab procedure. Results indicated that the Bituseal enamel was more resistive than Coal-tar and 3LPE coatings so that there was no change on the current density when Bituseal enamel had been used. On the other hand, the Coal-tar was lower corrosive resistivity than others due to existence of more porosity in its structure. As the same way, the current density consumption and its gradient by changing soil parameters were higher than 3LPE and Bituseal enamel coatings.