Hull Crawler Inspection of Floating Structures using Alternating Current Field Measurement (ACFM)

Jarime Baethge, Project Manager, Oceaneering
Ensuring the integrity of your floating assets is essential for keeping your operations running successfully. Oceaneering has a long track record of providing offshore floating asset inspections including providing services such as Ultrasonic Testing (UT) thickness measurements on dock pile, 3D photogrammetry of the internal structure of platform caissons, and alternating current field measurement (ACFM) weld seam inspections.

Oceaneering utilizes magnetic crawler systems that are small compact platforms that provide flexible options for data acquisition, which can range from simple general visual to close visual inspections with full HD cameras with 360-degree viewing. More complex options include 3D laser imaging and 3D photogrammetry.

Additional data acquisition options that can be installed onto the crawler platform include technology for material analysis. Such technologies include testing cathodic protection systems, ultrasonic thickness measurement tools for measuring material loss, and weld seem crack detection with ACFM.

The magnetic crawler systems provide both topside and subsea inspection versatility that help eliminate or reduce the need for divers and or swing rope access teams. With the crawler platform versatility and their ability to be deployed and installed by a working class Remotely Operated Vehicle (ROV) system, we have provided clients a cost-effective option to use ACFM technology to meet their asset class inspection needs. This service helped our client meet their inspection requirement, reduced their offshore personnel footprint, decrease operational risk with the elimination of divers, and with an added bonus by lowering their carbon consumption by utilizing incumbent systems to meet or exceed their deliverables.