Atteris reviewed the available datasets and highlighted the locations of interest (KP locations) where pipeline integrity may have been compromised.
The following information was used as part of the review scope:
- Previous reports on pipeline movement;
- Marine hydrographic survey data;
- XYZ strain data;
- Pipeline positional survey data.
A methodical approach was adopted where the various survey datasets were collated and compared along each pipeline section. The assessment covered strain comparisons, burial comparisons, scour detection and survey data (SSS, MBES etc.) comparisons from the various datasets. The level of accuracy of each dataset was also considered in the review. This information was then screened, reviewed and checked for correlations to provide a robust quantitative interpretation of the pipeline’s integrity. Imminent integrity threats were highlighted. Atteris also provided recommendations for future work to further quantify the risk at locations of interest.