Corrosion Mapping

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Large volumes of plant and equipment such as pipework, pressure vessels, bends and elbows can be inspected using Sonomatic’s Seescan – a pulse-echo ultrasonic technique that produces colour graphic imaging of the area scanned. An integral part of our non-intrusive inspection offering, the video-tracking technology is available in both fully-automated and free-hand versions. For non-intrusive work, scans typically cover 0.25sq metre per scan as a maximum, multi-scans are then are compiled into a composite to show the complete colour graphic image of the inner surface. Recent developments include the capability to inspect plant on-line in temperatures of up to 350C.

Corrosion mapping involves scanning one or more straight beam probes over a prescribed, dual axis scan pattern over a pipe or pressure vessel surface whilst taking thickness measurements. The measurements are converted into digital values which are color-coded to create topographic maps of the vessel or pipe wall thickness profile. Various types of crawler are available, ranging from our ruggedized, track-mounted Nautilus scanner, the magnetic wheeled crawler, Mimic, (bottom right), and our UT corrosion mapping system, MicroMap, with video-tracking of probe position.

Images (C-scans) from individual scan areas can be assembled together to create composite images covering large areas of material. This is a very powerful technique for management reporting or to observe widespread effects. The MicroMap system enables difficult access or awkward geometry components to be inspected by ultrasonic C-scan or corrosion mapping. This includes elbows, Tees, manifolds, sumps, dished ends, nozzles, etc.