To support pipeline integrity initiatives, Spectra Energy (Spectra) undertook to verify the pipeline coating condition on certain pipeline assets by performing DCVG or ACVG surveys on Class 2 and Class 3 locations and in HCA’s. The process undertaken was to consider the alignment of coating anomaly indications with ILI anomaly indications and to compare the results of direct examinations to anomaly indications. The alignment and comparison of the data is based upon the analysis of DCVG, ACVG, CIS and ILI data. The results of the direct examinations at the sites in the affected segments were reviewed to evaluate the condition of the pipelines as it relates to specific severity of the identified coating anomalies.
This paper will discuss the results and findings of those studies.