ExtradosScanner™ and LineScanner™
Wall Thickness Measurements of Subsea Pipe Bends
Subsea pipe bends serve as crucial connection points between main or branch pipelines, playing a vital role in directing the internal contents. Ensuring the integrity of these sections can be difficult, as pipe elbows are prone to erosion and corrosion within a pipe system.
The high velocity of fluid passing through the pipe and turbulence contributes to the erosion and corrosion of the material. Turbulence is high, especially where the pipe bends or is at an angle. This makes such angular edges the weaker point in a pipeline. Corrosion can encourage stress-induced cracks giving rise to pipe leaks or ruptures. The inspection of small diameter pipe elbows poses a significant challenge due to the surface shape change between the intrados and extrados.
Extrados Scanner
The remote deployable automated scanner facilitates the inspection of the extrados of 3in and 4in bends. This innovative device is capable of precisely locating and tracking the extrados of the bend while scanning critical areas that require high-risk inspection. It’s intuitive design incorporates magnetic drive wheels and self-aligning features to ensure seamless traversal along the bend radius.
LineScanner
A motorised scanner designed for inspecting non-ferrous subsea pipe elbows. Equipped with an internal encoder for distance measurement can be positioned on the bend using an ROV. Once released by the ROV, the scanner automatically clamps onto the pipe, enabling it to be driven along the extrados. This automated process streamlines the inspection procedure and enhances efficiency.
NDT Technology Options
Data-Rich Inspection Information
Subsea Phased Array
The SPA system is designed to offer the very best inspection solution for detecting wall thickness reductions due to corrosion, abrasion and erosion. The system’s high resolution is achieved by utilising an effective ultrasonic beam that is 60mm wide and can collect A-Scan information every 0.5mm. This ensures 100% coverage of the inspection area.
Case Studies
Subsea Phased Array (SPA) for Duplex Bends
TSC Subsea were challenged to investigate sand erosion concerns on subsea structure piping off the coast of Western Australia. The inspection campaign covered multiple assets, including Pipeline End Manifold (PLEM), tie-in spool and subsea cooling skid.
Custom Designed Extrados Scanner for Inspection of Subsea Gas Lift Riser
TSC Subsea rises to the challenge of scanning and data collection on small diameter pipe bends by developing a custom designed “extrados scanner” for inspection of gas lift risers.
Deploying dual NDT Methods for the Inspection of Complex Welds
The Challenge TSC Subsea received a request from a major operator, Equinor AS, to evaluate the feasibility of inspecting subsea risers coated with thermally sprayed aluminium (TSA).
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