Flexible Riser Inspection

The use of flexible piping has increased tremendously in the past decade. Its layered structure poses challenges for the inspection industry. If the outer sheath of flexible pipe is  breached, sea water can mix with the gases in the annulus, creating a corrosive atmosphere leading to failure. A reliable non-destructive inspection, which is able to penetrate the structural layers of the pipe, is therefore necessary. Acoustic Resonance Technology (ART) enables the medium detection in the critical annulus area of the flexible pipe.

Flexible Riser Inspection

Since flexible risers have been in service, there has been a need and requirement to determine the medium within the annulus of the flexible pipe. Flexible pipe annulus medium detection is a challenge due to the complexity of the multi layered and multimaterial structure in combination with the external forces caused by water depth. Providing a reliable non-intrusive inspection of the flexible pipe’s annulus has proven to be an industry challenge.

TSC Subsea solves this challenge by using its acoustic resonance technology (ART), a cost-effective, non-intrusive method to inspect flexible risers and flowlines. The technology was first commercialized for subsea inspections by DNV in the 1990’s; since then the technology was transferred to Halfwave and is now part of the TSC Subsea technologies group. The sensitivity of ART is very well suited to annulus medium detection solutions and was first patented in 2006. TSC Subsea has over many years developed deepwater subsea inspection systems, application solutions including studies, and testing focused on annulus medium detection.

ARTEMIS™ is TSC Subsea’s ROV-deployable inspection tool developed for external inspection of rigid and flexible pipelines, flowlines, and risers. It can be installed on most ROVs and easily deployed. The ARTEMIS™ tool is able to penetrate layers of material and is adjustable for a range of pipe sizes.

ARTEMIS™ technology:
• Characterizes the medium within the annulus
• Evaluates the outer sheath’s condition
• Provides structural information for integrity analysis

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...