Innovative Solutions for Challenging Splash Zone & Subsea Inspection

Innovative Solutions for Challenging Splash Zone & Subsea Inspection

While corrosion poses a substantial threat to the integrity of ageing subsea assets, the inspection and integrity assessment of the subsea assets is often challenging and costly due to accessibility issues and difficult inspection conditions such as water depth, visibility and temperature.

Despite that, there is an increasing requirement for splash zone and subsea inspection in order to determine the fitness-for-service for lifetime extension and condition monitoring of the assets such as risers, caissons, conductors, flexible risers, subsea pipelines and structures, etc.

In respond to market demands for the inspection and lifetime assessment support of splash zone and subsea assets, Innospection has developed over the past few years cost effective technology solutions combined with smart, multi-function MEC-Combi inspection tools that have been designed and built to target inspection, deployment and subsea accessibility challenges.

Based on the next generation MEC (Magnetic Eddy Current) technique, the multi-function MEC-Combi inspection tools have been designed to provide comprehensive inspection data within a single deployment. Supporting add-on inspection techniques such as high resolution Ultrasonic mapping, Pulsed Eddy Current for average wall thickness measurement, laser triangulation system for geometry scan and camera system for visual inspection can easily be incorporated into the versatile MEC-Combi tools to provide high density inspection data.

MEC (Magnetic Eddy Current) Technique

The next generation MEC technique is used by Innospection as a key tool for integrity assessment support.

Operating on high frequency magnetic field controlled Eddy Current in combination with specially developed Eddy Current sensors, the MEC technique is capable of inspecting through higher wall and coating thicknesses to detect internal and external defects including isolated pits of very small diameter and volume caused by bacterial corrosion.

The MEC technique is also capable of direct sizing the defects during scanning without the need for Ultrasonic verification.

As MEC is an electromagnetic technique, the asset needs not be cleaned down to the bare metal for the inspection to take place and for good quality inspection data to be produced. This is a major advantage over Ultrasonic capabilities for splash zone and subsea inspection.

MEC-MPS Scanners for Splash Zone Inspection

The fleet of marinised MEC-MPS Scanners has been designed and built to support the non-intrusive splash zone condition assessment of rigid risers, caissons, conductors and subsea structures including through the neoprene coating and Monel cladding.

Deployed from the topside by rope access personnel or by divers, the MEC-MPS Scanners are capable of a smooth transition from topside directly into the splash zone and subsea area without a break in the continuity of the remotely controlled scanning.

The incorporation of an advanced cleaning system to the MEC-MPS Scanners enables a cost effective simultaneous marine growth removal and inspection operation.

MEC-Combi Crawlers for Subsea Inspection

While large amount of the subsea pipelines are non-piggable and the internal inspection with the installation of subsea launcher and receiver involving huge costs, Innospection has developed the fleet for the external inspection of non-piggable subsea pipelines, subsea flowlines and manifold pipes.

Deployed from support vessels by divers or work-class / inspection-class ROV systems, the MEC-Combi Crawlers are capable of self-crawling along the inspection surface to perform the scanning while maintaining its stable contact despite the turbulences due to its integral buoyancy, hydraulic wheels and magnetic system.

For the inspection of concrete-coated subsea pipelines, Innospection offers the latest generation of PECT (Pulsed Eddy Current Testing) technology in a diver or ROV deployed inspection system. The PECT technique is capable of inspecting through 250mm coating. A semi-automatic scanning ring has also been developed to improve the inspection performance, particularly the timing and result reproducibility.

MEC-Hug Crawlers for Flexible Riser & Pipe Inspection

The patented MEC-FIT™ technique has been developed to deliver a reliable and technically advanced solution for the inspection of flexible risers and flexible pipes in-situ, mooring lines and umbilicals. The MEC-FIT™ technique is capable of detecting cracking, pitting, corrosion, wire misalignment and gaps in the single wire and multiple wires in up to three metallic layers of the flexible risers and pipes.

To deploy the MEC-FIT™ technique onto the flexible risers and pipes at their working locations, the fleet of sophisticated self-crawling MEC-Hug Crawlers have been built to perform the inspection. The MEC-Hug Crawlers are capable of axial and circumferential scanning to accommodate the various degrees of wire angle structures of the flexible risers and pipes.

Underwater Inspection In-Lieu of Drydocking (UWILD)

To enable the Operators perform the hull cleaning and inspection of the marine assets such as vessels, FPSOs, FSOs, semi-submersible pontoons and drill risers at their working location without the need for dry docking, Innospection is currently developing a MEC-Combi Robot.

The MEC-Combi Robot is remote controlled, topside deployed robotic inspection system that is based on the next generation MEC technique with high detection sensitivity for internal and external corrosion and defects. It is also a smart inspection system aimed at replacing the need for diver activities in the UWILD inspections.

R&D Solutions

As Innospection stands for Innovative Inspection, a large in-house R&D team supports the company in the development of optimum inspection solutions and equipment to help Clients solve their niche inspection challenges and integrity targets of the splash zone and subsea assets.

http://innospection.com

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Subsea and Offshore Service Magazine is produced by Crystal Design & Media Ltd (No. 07640081)

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