After one of our client ran a geometry tool it was determined that a standard single- or dual diameter Magnetic Flux Leakage (MFL) inline inspection tool would not be able to pass the pipeline, and it was also found that the pipeline contained 1.5D bends. While the operator’s current ILI vendor had a multi-diameter tool, it could not navigate the tight bend radius. With deadlines looming, it was imperative that a time-sensitive and economic inspection solution be found quickly.
The ROSEN Group eagerly accepted the challenge. A team of design engineers at our Technology and Research Center in Lingen, Germany, conducted a feasibility study and produced a tool design that would be able to inspect pipelines with diameter changes by as much as 6-inches, as well negotiate bends of 1.5D or greater.
Another design challenge they considered was product flow. A problem inherent to multi-diameter pipelines is that the product tends to surge where the pipe changes from one diameter to another, which can affect the accuracy of the data collected. ROSEN’s active bypass speed control unit provided the solution.
Within a very tight time frame of only nine months, ROSEN managed the challenge from concept to job site. The 30×36-inch MFL tool completed the survey successfully on the first run.
By providing our client the ability to utilize the inline inspection method, they were able to avoid using other more costly, time consuming, and less accurate inspection methods such as direct assessment or hydro-testing. The project was completed ahead of schedule, on budget and allowed the operator to meet their deadlines according to their Integrity Management Plan.
ROSEN is committed to creating inspection solutions for challenging pipeline segments.