(With link to video) A robot designed to hook onto, and scale up and down, large mooring chains, both at sub-sea level and in the air – with a non-destructive testing (NDT), ultrasonic imaging system on board that scans for critical defects – has recently undergone successful field trials.
The new climbing robot, named RIMCAW (Robotic Inspection of Mooring Chains in Air and Water), is the result of a year-long, fast-track project that secured funding from Innovate UK, a Government agency. It is being delivered by collaborative partners Computerised Information Technology Ltd, Innovative Technology and Science Ltd, London South Bank University and TWI Ltd.
Autonomous Inspection
The inspection of large mooring chains, of the type most commonly used in the oil and gas industry, presents challenges due to the dynamic service conditions of both the underwater and atmospheric environments. RIMCAW can autonomously move up and down a mooring chain, and handle the catenary curve, as directed from a top-side control system. It will start scanning for flaws as soon as it is deployed. It will identify issues such as fatigue cracking as it progresses, and record the scanned data for subsequent downloading and analysis once it has completed its inspection.
Field Trials
The field trials took place in the diving facility at TWI, Middlesbrough. The robot was tested for being neutrally buoyant, watertight and functional as anticipated, whilst simultaneously putting its sophisticated hardware through its paces. These simulated trials have proved that RIMCAW is fit-for-purpose, as well as commercially viable, thereby paving the way for further field trials in real-world operating conditions.
Watch a short video of the field trials on the TWI Facebook page.
Inspected While in Service
Channa Nageswaran, RIMCAW Project Leader and NDT Team Manager at TWI explained: ‘The RIMCAW robot will enable chains to be inspected in service for the first time and can be rapidly deployed on demand. In combination with its ability to scan each mooring chain link separately for critical defects, using the on-board NDT technology, it will offer significant benefits to industry. These include: provision of data on the emergence of critical fatigue cracking to inform traceability of mooring chain lifetime monitoring; diminished risk to the environment, improved health and safety for personnel; and potential cost savings as a result of the enhanced inspection procedures,’ he said.
Picture: RIMCAW being deployed into the water.
