Certain jacket nodes—fatigue-sensitive nodes—are subject to significant dynamic loading and require regular inspections to detect the initiation of fatigue cracks. The complex nature of the welds rule out inspections via ‘direct scanning,’ even with the best work-class ROVs, and the difficult access and dangerous conditions are often outside the capabilities of divers.


TSC Subsea’s field-proven NodeScanner™ system addresses these issues. An ROV places the NodeScanner on the brace, then stands back and monitors the inspection progress. The NodeScanner’s unique teach-and-learn system provides the dexterity and control needed to quickly and accurately scan the area in question.

The NodeScanner system, designed to work in tandem with ROVs in the deployment of TSC Subsea’s ACFM® Array probes, inspects difficult-to-reach areas and complex geometries such as tubular welded node joints. The multi-element arrays ensure maximum weld coverage and POD, whilst limiting false calls.

The NodeScanner:

  • Can be deployed with TSC Subsea’s ACFM®, ART, or PEC systems
  • Is designed to fit the diameter of any brace
  • Offers buoyancy that reduces its weight, reducing drag on the ROV
  • Uses precise, motorized movement to accurately track the geometry of the weld
  • Uses passive compliance to reduce the effects of an uneven inspection surface
  • Provides camera views that allow operators to predict a correct scan path
  • Offers an optional wheelbase that can be used instead of the unit’s frame

Our Services

Subsea Structures

Splash Zone

Vessels and FPSOs

Flexible Risers



Case Studies

Acoustic Resonance Technology External Measurement Inspection System

The purpose of the inspection was to measure effective steel thickness through 4 inches of pipeline insulations made of Glass syntactic polypropylene and injection moulded polypropylene. Scanning operations were carried out at 2000 meters water depth. More than 40...

Remote Subsea Inspections

Remote Subsea Inspections

The challenge Risers, and the riser guides that hold them in place, are subject to severe environmental conditions that often lead to fatigue damage. Failure of these structures could be potentially catastrophic so they must be inspected regularly to ensure structure...