Subsea and splash zone robotic crawler

The TSC Subsea MagCrawler represents the latest in remote subsea inspection technology. It was developed specifically to enable the ROV deployment of TSC Subsea’s exclusive Alternating Current Field Measurement (ACFM®) Array Probes to inspect subsea geometries such as circumferential welds in pipes/tubulars, fillet and full-penetration welds in plates.


The MagCrawler™ provides access to areas that are restricted, dangerous or expensive to reach using divers, such as the splash zone and confined compartments.

The MagCrawler™ offers smart deployment and operation:

  • Once the MagCrawler™ magnetically attaches to the inspection surface, the ROV releases it.
  • Two rubber caterpillar tracks provide crawler traction and are easily manoeuvrable to steer the crawler over the inspection surface.
  • Motorised mechanisms allow the probe to be deployed accurately over the weld to be inspected.
  • A 360° rotational head allows flange welds to be inspected with full coverage of the weld and the heat-affected zone.
  • Passive compliance holds the probe in contact with the inspection surface, ensuring the probe is aligned correctly with the inspection surface during operation.
  • Dedicated control software follows simple weld paths.
  • Positional adjustments can be made in both longitudinal and transverse directions, which allows full coverage of the area to be inspected.
  • The MagCrawler™ captures high-quality Non-Destructive Testing (NDT) data with fine motor controls, and on-board, backlit cameras provide real-time visual feedback to verify that the stipulated scan criteria are being met.

The MagCrawler:

  • Can be deployed by ROV or via deck launch
  • Can be deployed with ACFM®, ART, SPA™, or PEC
  • Has typical inspection speeds of 30mm/s (1.18ins/s), with a multiple pass inspection being 15 mins/m
  • Is rated for water depths up to 150m (493ft)
  • Can easily maneuver on diameters greater than 760mm (30 ins)
  • Uses a closed-loop feedback motor control for accurate weld tracking and a uniform scan speed
  • Can inspect through paint and other coatings
  • Is tolerant of residual marine growth


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