DTRS56-04-T-0002 Determining Reassessment Intervals Through Corrosion

The objectives of this program are to develop methods based on sound fundamental principles to estimate: (1) external corrosion rates, especially in CP shielded areas, and (2) internal corrosion rates by considering pipeline-relevant factors for gas and liquid lines. Mathematical models will be developed to achieve the above goal. The models will be compared with field and laboratory data for validity and the models will be simplified to a format that is applicable to pipeline operators to estimate pipeline external or/and internal corrosion rate. It is recognized that the development of fundamental, physics-based models to predict corrosion rates for each of these areas is a daunting task. Therefore, this project aims to develop models that can be used to predict the pipeline corrosion rate in some scenarios that are relatively conservative and are expected to occur more commonly in the field. The goals were (1) external corrosion rate calculation, (2) internal corrosion rate calculation, (3) validation of the external corrosion rate calculation, (4) field validation of the internal corrosion rate calculation, and (5) reporting and recommendations.