Subsea NDT for Oil and Gas

Inspection services for critical subsea assets

TSC Subsea distinguishes itself by offering a wide array of advanced Non-Destructive Testing (NDT) methods tailored for the subsea oil and gas sector.

Our robotic inspection systems, equipped with NDT capabilities, can be deployed by remotely operated vehicles (ROVs) or diver assistance. This versatility enables us to carefully choose and utilise the most suitable NDT methods that align with the unique needs of our customers.

Subsea Pipeline Inspection

Subsea pipeline inspections require the highest level of accuracy to produce high-quality, dependable inspection data. The pipeline’s integrity depends on it. TSC Subsea ARTEMIS and the vCompact™, incorporating TSC Subsea’s industry-leading Acoustic Resonance Technology (ART) or Subsea Pulsed Eddy Current Testing Array (SPECTA™), offer unique solutions for inspecting subsea pipelines, unpiggable pipes, flowlines, risers, and jumpers.

With the capability to conduct wall thickness measurement inspections even through paint, thick attenuative coatings, and soft marine growth while maintaining exceptional accuracy and eliminating the need for radioactive sources, TSC Subsea is the preferred NDT inspection service provider for many major operators.

Pipeline inspection with ARTEMIS

Rigid and Flexible Riser Inspection

Flexible riser inspection

The use of flexible piping has increased tremendously in the past decade. Its layered structure poses a major challenge for the oil and gas industry. If the outer sheath of the flexible pipe is breached, seawater can mix with the gases in the annulus, creating a corrosive atmosphere that leads to failure. Therefore, a reliable non-destructive testing (NDT) method, which can penetrate the riser’s structural layers, is necessary. The technology of choice for many major operators is Acoustic Resonance Technology (ART). Combined with the ARTEMIS® robotic delivery method, it has a proven capability in annulus diagnostics for the large variety of flexible riser designs used by global suppliers, classifying annulus conditions, with insulation thickness of up to several inches, as wet or dry.

Subsea Structure Inspection

Examining subsea structures, including assessing their structural welds, is paramount in maintaining the integrity of oil and gas production activities. The complex nature of subsea structures means inspecting these assets can be challenging, expensive, and even dangerous, especially with traditional diver-assisted inspections.

With a wealth of experience, TSC Subsea has effectively executed numerous inspections utilising various NDT technologies on critical welds within subsea structures using a variety of our subsea robotic solutions, including the MagCrawler™ and NodeScanner™.

Being a DNV-approved service supplier for Alternating Current Field Measurement (ACFM®) for Offshore Projects and Offshore Units/Components demonstrates our competence and expertise.

NDT of subsea structures

Flooded Member Detection (FMD)

Flooded member detection

TSC Subsea utilises its proprietary radiation-free Acoustic Resonance Technology (ART) to detect seawater in a member. In contrast to alternative FMD techniques, such as Ultrasonic Testing (UT), the ART probe maintains a standoff distance from the inspection surface.

This feature reduces the need for extensive cleaning and eliminates the potential for probe damage, making it a highly effective and efficient method for flooded member detection.

Floating Production, Storage, and Offloading Vessels (FPSOs)

Regular inspections of the FPSO hull and bilge welds are crucial to identify cracks and defects resulting from dynamic loading.
TSC Subsea’s advanced Alternating Current Field Measurement (ACFM®) electromagnetic inspection technology combined with the MagCrawler™ can support underwater inspections instead of drydock (UWILD) inspection campaigns by safely detecting and sizing subsea surface-breaking cracks in critical welds such as bilge keels while the vessel remains in service.

FPSO hull inspection survey

Grout Integrity Verification

Offshore Grout inspection

Numerous offshore operators have structures featuring grouted connections. Until recently, there was no viable method for confirming the presence and integrity of the grouting.

TSC Subsea’s solution can verify the grouting integrity behind the pile sleeve and look for features and inconsistencies, such as voids and cracks in the grout, behind the pile sleeve and dis-bonding between the pile sleeve and grout, which may have developed over time in subsea grouting connections.

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Case Studies

Smooth Sailing with ACFM Crack Assessment on Cargo Ship Propellers.

The Archon Gabriel Bulk Carrier was navigating the cold waters of the Gulf of Finland. The harsh sea conditions, laden with sea ice, posed significant navigational challenges and resulted in the ship’s 6-meter diameter bronze propeller suffering ice damage. Given the...


Our Services

Subsea Structures

Splash Zone

Vessels and FPSOs

Flexible Risers