Fig 2MFL pipeline rundrag · arrows · space to playisolated pit · odo 127
Magnetic flux in the wall, leaking out at metal lossMetal loss: on the pipe, a triangle on the record, in the listGirth weld: on the pipe, a bar on the record, in the listTool, traps, valves, supports, road crossingIllustrative, not to scale. The tool is launched from the barrel on the left by flow through the kicker line, runs the pipeline under the road and is caught in the barrel on the right. As it passes a feature, the sensors read the flux that leaks from the wall there. Girth welds answer on every row of the record at once; metal loss only on the rows at its position round the pipe. The peaks are qualitative: their shape is not a size, depth or severity. Odometer ticks have no unit.