TSC Launch New Subsea Inspection Tool: the ACFM Magcrawler™
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11 August 2015
Following on from a successful diverless ACFM® inspection campaign in the Norwegian sector of the North Sea, a new development has evolved in the arena of subsea inspection - the ACFM MagCrawler™
TSC’s ACFM® inspection method is widely used for subsea weld inspection, deployed by diver. This specialised solution enables accurate inspection of subsea welds where access can be difficult or costly to reach with divers. Advanced control software, enables the ACFM MagCrawler™ to track a wide range of weld geometries, typically found on fixed and floating structures.
The ACFM® MagCrawler™ is magnetically attached to the inspection surface. Two rubber caterpillar tracks provide the traction and allow accurate steering of the ACFM MagCrawler™ across the surface. When deployed by ROV the ACFM MagCrawler™ is delivered to the structure and operates autonomously with the ROV stood off. This minimizes the station keeping requirements of the ROV.
The ACFM MagCrawler™ can manoeuvre easily on flat surfaces or tubulars with a diameter greater than 30 inches (760mm). Motorised adjustments of probe position can be made in both parallel and transverse directions, allowing full coverage of the area to be inspected. The probe is held in contact with the inspection surface using passive compliance, ensuring that the probe is aligned correctly at all times. A 360o degree rotation head means flange welds can be inspected with full coverage of the weld and heat affected zone.
The combination of TSC’s ACFM inspection technology with the ACFM Magcrawler™ deployment can deliver particularly high inspection performance with a capability to detect and size defects as small as 15mm long by 1mm deep in welded connections, even when inspected through a protective coating.