Magnetic flux leakage ยท in-line inspection
How a tool inside a pipe finds lost metal
Two interactive isometric figures. Drag the tool sideways, or leave it to play its tour. Where the pipe wall is thinner, magnetic flux leaks out of the steel, and a ring of sensors riding the wall reads it.
Pipeline run
The tool is launched from a trap, runs four welded spools under a road and is caught in the receiver. Welds and three kinds of metal loss build up on an eight-row record.
Single spool
The tool on its own in a cut-away test spool: magnets, brushes, the sensor ring and the leak at one external pit.
A4 sheets
Printable versions of the pipeline run.