UNDERWATER INSPECTION
Above: Rovco 3D equipped ROV.
of up to 80% compared with traditional survey methods.
At Rovco we use the latest camera technology to generate accurate co-ordinates of a given object. These co-ordinates are processed, along with additional steps, to generate a 3D reconstruction of an object. The data can then be used for asset management, predictive analytics, inspection, repair and maintenance programmes.
The system can be deployed to depths of 6000m using a Remotely Operated Vehicle (ROV) or Autonomous Underwater Vehicle (AUV), to collect raw 3D data which is then processed by imaging software to obtain 3D volumetric information, ensuring a true representation of the subsea environment. This enables the system to be mounted at sea with little site preparation required, removing the need for a large specialist or technical support team.
The level of detail provides more useful information which in turn allows for easy visualisation and advanced analysis. All data is processed on-board and can be directly streamed and viewed topside.
Digital 3D photogrammetry also
allows for data to be captured from hard to reach, challenging or hazardous areas. It is best suited for the measurement and inspection of large objects in challenging settings where environmental factors such as vibration, movement and extreme temperatures are often found. With digital photogrammetric systems, precise measurements can be captured in even the harshest underwater environments.
The technology can also be used to verify and determine the damage or impact caused by offshore incidents. Notably, it was used by BP to help visualise and resolve damage following the Macondo Deepwater Horizon disaster in the Gulf of Mexico.
3D models are constructed by matching pixels between overlapping images and using algorithms to determine component geometry through a series of iterations.
The results provide an accurate representation of existing component conditions and can be measured to determine the geometry of damage or anomalies. The 3D models can be exported to industry-standard CAD (computer-aided design) packages, enabling improved future project
planning through smoother distribution of information between involved parties.
This technology also offers an alternative to 2D contour charts often used to outline seabed structures. It’s possible to zoom in and out and navigate along the seabed. This allows for immediate decision making even during the most complex subsea operations around the globe.
I believe that the demand for 3D photogrammetry will increase in line with the growing need for large volumes of accurate data for critical analysis. Frequent risk-based inspections are vital in assessing the condition and integrity of subsea equipment.
To determine the state of equipment that is often thousands of meters below the ocean’s surface is no easy task, however as technology continues to advance, we will be gaining an even greater perspective view of the subsea world. 3D photogrammetry is a huge breakthrough for the industry as a means to identify, diagnose, and provide solutions for underwater assets.
For more information about Rovco, visit:
www.rovco.com May 2017 |
www.sosmagazine.biz | p35
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