A Case Study of the Crack Sizing Performance of the Ultrasonic Phased Array Combined Crack and Wall Loss Inspection Tool on the Centennial Pipeline, the Defect Evaluation, Including the Defect Evaluation, Field Feature Verification and Tool Performance Validation (Performed by Marathon Oil, DNV and GE Oil & Gas)

GE performed an ultrasonic phased-array (USCD DUO) in-line inspection (ILI) survey of a 24-inch and 26-inch products pipeline. The primary purpose of this ILI survey was to detect and characterize stress corrosion cracking (SCC). A dig verification was subsequently performed throughout 2008 in order to establish a higher level of confidence in the detection and depth-sizing capabilities of this technology. Presented herein is an overview of the USCD technology and experience, the method used for validating the ILI survey results, enhancements to the ILI data analysis, and the impact on managing the integrity of the subject line section.