INGU’s Pipers determine metal features within pipelines by measuring residual magnetization using 3D digital magnetic sensors. Magnetic flux in a pipeline is a combination of magnetic characteristics created during manufacture and construction, and changes that take place over its operational lifespan. Magnetic characteristics can be used to identify changes in the pipeline’s composition or to identify different pipeline sections, such as differences in material, grade or variance in construction date. During an initial Pipers screening, the magnetic flux is measured by calculating the statistical spread in the data over the entire length of the pipeline. In some lines, breakpoints in the magnetic flux are identified, for example at license changes, and the statistical spread over these sections is calculated individually. Measurements that exceed the statistical spread, excluding joints, are identified as outliers and are further investigated as potential anomalies.
Survey length: 0.4 km
Pipe diameter: 2-inch
Pipe composition: steel
Resource carried: oil well effluent
Our client bought 25-year-old assets with an unknown history. One of the lines failed and, as a result, the client wanted to have an indication of the condition of the other pipelines in the field. The acquired assets consisted of 2-inch and 3-inch pipelines that were inaccessible to conventional inline inspection tools. Deploying Pipers technology, they gained full inspection access to multiple lines in the field. The survey results revealed pipelines that were in poor condition. The client conducted verification digs to confirm that their assets were, indeed, in poor condition. The results supported our findings and operations in the field was suspended.