Bi-directional Tethered In-line Inspection (ILI) Pipeline Integrity Solutions

TSC Subsea’s Triton Bi-directional Tethered In-line Inspection (ILI) solution redefines internal pipeline integrity assessments of unpiggable or non-piggable pipelines. The robotic internal pipe crawler utilises triple independently powered tracks to ensure traction even in the most challenging conditions. Triton can deliver multiple NDT techniques to the inspection surface even at distances up to 300 m (1000 ft) or in submersed or flooded conditions up to depths of 150 m (492 ft).

Tethered In-line Inspection (ILI) Pipeline Solutions

Ensuring the integrity of pipeline systems is crucial for optimising efficiency and production rates while minimising environmental impact and ensuring the safety of personnel and the public. Neglecting the maintenance of pipelines can result in decreased production and, in the worst-case scenario, lead to catastrophic failures due to unidentified cracks or corrosion.

Pipeline operators commonly opt for in-line inspection (ILI) pigging solutions, but these methods require specific pig launching and receiving facilities. When such facilities are unavailable, the pipeline is typically labelled as non-piggable, unpiggable, or challenging to inspect. This is where Triton comes into its element.

tethered ILI pipe inspection

Triton – Inspecting Unpiggable Pipelines

Land based un-piggable pipeline
  • Inspection of pipelines that are challenging for traditional piggable methods.
  • Ideal for pipes with a single entry and exit point.
  • Travel horizontally, vertically and through pipe bends.
  • Offers various configuration options to accommodate different pipe setups or internal components.
  • Capable of reaching depths of up to 150 m (492 ft) of flooded pipes.
  • Travel a distance of up to 300 m (1000 ft).
  • Capable of full 360-degree circumferential scanning.
  • Suitable for both dry and wet conditions.

Equipped with advanced Non-destructive Testing (NDT) technologies and engineered for the challenges of un-piggable pipelines, this powerhouse combines triple independently powered tracks and an adaptable tripod chassis for intricate inspections across various pipe sizes and orientations, including the ability to navigate horizontal, vertical and even multiple 90-degree bends in both dry and wet conditions.

Manufactured from anodised aluminium and stainless steel, the Triton withstands rugged conditions. A 150 m (492 ft) depth rating ensures confident inspection in water and humidity-prone environments. Inspection areas are illuminated with powerful LED lighting while onboard cameras capture high-resolution video.

tethered in-line inspection with Triton

Advanced NDT Techniques

The adaptable Triton ILI internal pipe crawler can operate in both dry and wet environments. It can integrate various NDT techniques based on the inspection requirement, including corrosion mapping, wall thickness measurements, ovality and dents assessment, crack detection and sizing in welds, remote visual inspection and through coating or unprepared heavily corroded surfaces inspections.

ILI Laser Scanner
  • Alternating Current Field Measurement (ACFM®) for detecting surface-breaking cracks and sizing welds.
  • Phased Array Ultrasonics (PAUT) for high-resolution quantitative wall thickness measurements, corrosion mapping, and volumetric weld inspection.
  • Acoustic Resonance Technology (ART) for quantitative wall thickness measurements, through coating and unprepared surfaces.
  • Pulsed Eddy Current (PEC) for inspecting highly corroded and scab surfaces.
  • Remote Visual Inspection (RVI) with a high-resolution PTZ camera.
  • Laser Scanning for a comprehensive 360-degree internal assessment.


Case Studies

Tethered ILI Robotic Solution for Internal unpiggable Riser Inspection

bp approached TSC Subsea with a unique challenge: to conduct an internal inspection of an unused riser located on one of their North Sea offshore platforms. Due to an upcoming development project, bp aimed to commission the riser for service.

External Subsea Inspection of Flexible Risers

Flooded annulus due to an external sheath breach has proven to be one of the top failure modes of flexible riser systems. It has also been found that CO2 permeation from produced fluids can accelerate armor wire corrosion, leading to flexible riser failure.

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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