Total Marine Technology ULS-200 Asset Scanning
2G Robotics with Total Marine Technology demonstrated the efficacy of the underwater laser scanners for detailed and comprehensive asset modelling.
Total Marine Technology (TMT) is an Australian company that provides locally built Work Class Remotely Operated Vehicles (ROV’s) and intervention tooling designed specifically for the offshore drilling and production industry. TMT sought to test 2G Robotics’ ULS-200 by scanning a Subsea Intervention Device (SID), an H4 Wellhead Connector with ROV Interface Panel, and a Light Well Intervention (LWI) Device. Those three pieces of equipment were scanned in an open air environment. Two smaller objects, a short pipe with a flange welded to it and an aluminum cylinder, were also scanned during the trials. Those two objects were scanned in an open air environment as well as in water in a test tank.
The scans were conducted at a range of 2.5m from the target objects and were registered using overlapping areas of adjacent scans. The data processing was primarily completed using the open source software, CloudCompare. TMT also used Hexagon’s 3D Reshaper to create a mesh from the point cloud data and then overlay a photo taken with an SLR camera on the mesh. After processing the data, TMT measured points within a single point cloud and within the merged clouds of each object. TMT then obtained physical measurements to compare to the measurements obtained from the point clouds to validate the accuracy of the system. The comparison confirmed the ability of the ULS-200 to provide millimetre-level measurement accuracy point to point for a single object and point to point between separate objects.
The tests definitively showed the superiority of 2G Robotics’ Laser Scanners over the current methods TMT had been employing. TMT Survey Manager, Adam Hamilton, stated that “the ULS-200 performed equally well in both environments” and Technical Coordinator, Roger Garnett, commented on how the ability of the ULS-200 to “store data directly to the command computer allowed for fast quality control and prompt post-processing capabilities.”
Hamilton went on to say “the ULS-200 proved to perform to the highest degree of accuracy and precision.” With the purchase of a system, TMT has begun using the scanner to obtain accurate dimensional information for applications including “damage analysis of objects such as cracks and deformation, marine growth measurement, and pipe and flange face measurements.”