Subsea Pipeline Inspection

Precision Pipeline Integrity: Accurate Wall Thickness Measurements and Corrosion Mapping

Subsea pipeline inspections require the highest level of accuracy to produce high-quality data. Pipeline integrity depends on it. TSC Subsea ARTEMIS® and the vCompact, incorporating TSC Subsea’s industry-leading Acoustic Resonance Technology (ART), offer unique solutions for inspecting unpiggable pipes. ART is the only high-resolution technology that penetrates and inspects through thick subsea coating with lightweight, high-precision 3-axis scanning to produce high accuracy wall thickness measurements and corrosion mapping.

Subsea Pipeline Inspection Services

  • Validation of In-Line Inspection (ILI) surveys.
  • Evaluation of internal pipeline corrosion and erosion.
  • Unpiggable and piggable coated and uncoated subsea pipelines.
  • Tethered In-Line Inspection (ILI) solutions.
  • Oil and gas pipelines and flow lines.
  • Detection and measurement of weld defects.
  • Subsea corrosion mapping.
  • Corrosion Under Insulation (CUI) assessment.
  • Measurement of pipeline geometry, including ovality/out-of-roundness and dents.
  • Wall thickness measurement of pipe bends and elbows.
  • Detection and measurement of hydrates.
Subsea Pipeline Inspection with TSC Subsea ARTEMIS

In-Service External Subsea Pipeline Scanners



The TSC Subsea ARTEMIS ART system enables subsea pipeline inspection via ROV without the need for field joint coating removal. This greatly reduces integrity risk and the cost of expensive inspection operations. The ARTEMIS is compatible with most work-class ROVs and delivers real time data that provides a 2D image of the wall thickness of the inspected area. The inspection can also provide information about coating thickness and identifies whether a loss of wall thickness is on the outside or inside of the inspection area of the pipe.

It has a wide range of applications including through-coating inspections, piggyback solutions and field joint inspections.

Key benefits of TSC Subsea ARTEMIS, with ART technology, include:

  • Remotely deployed by inspection or WROV.
  • Provides direct quantitative wall thickness measurement with highly accurate depth sizing (± 0.2mm).
  • Full 360-degree subsea corrosion mapping.
  • Versatile design for axial and circumferential measurements.
  • Instant data capture with live topside feed for audit and comparison purposes.
  • Lightweight with minimal dredging requirements.
  • Minimal vessel time required.
  • Enhances life extension of the equipment.
ARTEMIS inspecting piggyback line



The TSC Subsea vCompact is a smaller, lightweight, more-flexible version of the standard ARTEMIS. Incorporating TSC Subsea’s ART technology in its design, it has all the capabilities of ARTEMIS with some additional features. Its smaller size and more flexible frame makes it the ideal solution for tight access field joint, right access tubular, subsea jumpers, risers and riser guides and hot tapping locations inspection without the need for coating removal.

Designed to work in tandem with inspection class ROV for the remote inspection of pipelines and structures, the tooling uses motorised and encoded manipulators which enable the probe to accurately follow the areas to be inspected. Inspection data is transferred to a topside computer and can be analysed from anywhere in the world.

Key additional benefits of TSC Subsea vCompact, incorporating ART technology, include:

  • Tight access semi-automated precision scanner with ART.
  • Diameters range 89 mm (3 in) to 3000 mm (118 in).
  • Dedicated ‘teach and learn’ software to follow complex geometries.
  • Magnetically attached for efficient deployment.
vCompact ROV deployment
Spectrogram showing the acoustic response from the pipe. Defects are clearly visible on the C-scan.
C-scan showing wall thickness measurement.

Internal Pipeline Scanners


Un-piggable pipeline inspection with tethered in-line inspection crawler

TSC Subsea revolutionises internal pipeline integrity assessments for un-piggable or challenging-to-inspect pipelines with its innovative Bi-directional Tethered In-line Inspection (ILI) TRITON solution. These solutions are equipped with advanced Non-destructive Testing (NDT) technologies tailored to the unique challenges posed by such pipelines or relevant damage mechanisms.

The system features triple independently powered tracks and a versatile tripod chassis, allowing it to conduct intricate inspections across a range of pipe sizes and orientations. Its capabilities extend to navigating horizontal, vertical, and multiple 90-degree bends in both dry and wet conditions.

Key benefits of TSC Subsea TRITON include:

  • Inspect un-piggable or non-piggable pipelines.
  • Suited for pipelines featuring a singular entry and exit point.
  • Navigate horizontally and vertically, and negotiate bends within the pipes.
  • Provides diverse configuration choices to adapt to distinct pipe arrangements or internal components.
  • Capable of scanning depths of up to 150 m (492 ft) in flooded pipelines.
  • Cover distances of up to 300 m (1000 ft).
  • Conduct comprehensive 360-degree circumferential scans.
  • Applicable for use in both dry and wet conditions.
tethered in-line inspection with Triton


Case Studies

4” of Coating no Match for ART and ARTEMIS

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.

High-resolution integrity inspection of a 24-year-old water injection pipeline

A major North Sea operator required accurate, high-resolution wall-thickness data to determine the integrity of a 24-year-old water injection pipeline. The measurements would enable the operator to assess corrosion growth to inform a risk-based inspection strategy.

Inspecting Concrete Weighed Pipes with SPECTA

TSC Subsea was contracted by a client to carry out wall thickness assessment of Condensate Export Pipeline (CEP) and Pipeline End Manifold (PLEM) without removing the protective concrete weight coat (CWC).

See all case studies

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