RMR is a German pipeline operator with a multi-product pipeline network with a total length of 524 km through western Germany. On one pipeline section an illegal tap was expected based on ultrasonic pig data. To confirm and locate the expected illegal tap, the pipeline section was inspected using EMPIT’s Current Magnetometry Inspection (CMI) technology.
CMI creates a self-applied magnetic field around electrically conductive pipelines using a multifrequency AC source. Analyzing the magnetic field and current behavior enables advanced 3-dimensional mapping, combined coating defect localization with corrosion assessment, as well as individual requests such as anomaly identification.
During the inspection run, EMPIT’s team detected deformed magnetic field lines, while B-field gradient analysis revealed current loss from the pipeline into the ground. These findings indicated an external metallic connection. Multi-frequency analysis confirmed an ohmic pipeline-to-soil contact, and a measurable DC funnel at the surface verified bare steel exposure with low resistance.
The identified anomaly coordinates were provided the same day of the inspection, resulting in the rapid removal of the illegal tap within the next day. The overall time between request and removal of the tap was less than a week.
Minimal preparations are required on the operator’s side, providing only basic pipeline information. One major advantage for the pipeline operator is the ability to detect illegal taps without requiring an active or leaking connection, unlike ultrasonic pigs or sniffer dogs. This enables the detection of well-hidden and tight taps and avoids delays experienced in the past.
During inspection, the overall pipeline operation – including CP systems - can be operated without interruption, allowing a short-term and flexible assignment. In addition, the high spatial resolution directly delivers accurate coordinates, which allows for prompt intervention if required.
Overall, this case is an example of the efficiency and accuracy of CMI.