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Sonardyne, Oceaneering Demonstrate ROV Capabilities in U.S. Gulf
A recent trials partnership between Sonardyne International Ltd. and Oceaneering International, Inc. has resulted in the development of a Fly-By-Wire (FBW) system for ROV (Remotely Operated Vehicle) control in any water depth, allowing the vehicle to hold station indefinitely and navigate to real-world coordinates automatically.
A Sonardyne SPRINT system was installed on one of Oceaneering’s Maxximum ROVs and integrated with a Sonardyne Ranger 2 Ultra Short Baseline (USBL) system for acoustic aiding of the Inertial Navigation System (INS). The trials took place in the Gulf of Mexico in water depths of 3,057 metres (10,030 ft) and results showed that continuous hovering of the ROV in mid-water beyond Doppler Velocity Log (DVL) range was possible, as well as automatic navigation to waypoints.
The majority of ROV navigation systems utilize an Attitude and Heading Reference System (AHRS) and DVL to provide a relative or dead reckoned position. These systems are subject to time and distance based position errors and only operate close to the seabed, meaning mid-water operations are conducted via manual control so real world or relative coordinates cannot be easily used by the ROV pilot. To address these limitations, Sonardyne and Oceaneering have developed a novel navigation and control system solution utilising the dual output of INS and AHRS data from SPRINT to provide ROV Dynamic Positioning (DP) in all water depths with capabilities beyond current state-of-the-art, without affecting reliability or ease of use.
The system has two methods of ROV control: ‘Navigation’ and ‘Passthru’. In ‘Navigation’ mode, the ROV control system uses INS positioning optimised for DP with real-world position, velocity and attitude data at high output rates. This speeds up ROV operations by improving vehicle control precision, automating station keeping and delivering FBW capability. ‘Navigation’ mode is available continuously in all water depths when USBL data is available. If the INS solution should become degraded or is unavailable, the system automatically reverts to ‘Passthru’ mode. ‘Passthru’ mode is a dead reckoned solution using self contained AHRS data that is inherently robust and reliable when combined with DVL data.
The results of the trial showed that continuous hovering of the ROV in mid-water beyond DVL range was possible, as well as automatic navigation to waypoints. When the ROV was in DVL range of the seabed the ‘Navigation’ mode performed equally as well as the ‘Passthru’ mode but with the added benefit of real-world referenced positioning data from the USBL system. The faster update rate (20 Hz, compared to the 5 Hz rate of the DVL) has the potential to refine vehicle control precision.
Commenting on the development, Mark Carter, Business Development Manager for Inertial Systems at Sonardyne said, “Fly-By-Wire ROV control using real-world coordinates significantly improves operational efficiency compared to relative-only positioning methods. Faster navigation updates, automatic registering of waypoints and indefinite mid-water station keeping speed up ROV operations and ultimately save ROV and vessel time.”
Mark Philip, ROV Technology Manager at Oceaneering stated that, “Autonomous flight control is an increasingly important feature for ROVs. Oceaneering’s Fly-By-Wire system has greatly enhanced the efficiency of the service we provide to our customers since its introduction several years ago. The integration of the SPRINT inertial navigation system further enhances this capability by providing hands-free hovering and navigation throughout the entire water column. We place high importance on ease of operation and redundancy and are confident that our collaboration with Sonardyne satisfies these requirements.”
Sonardyne, Oceaneering Demonstrate ROV Capabilities in U.S. Gulf| Offshore Energy Today.
- Canyon Offshore’s Olympic Triton Returns to the Gulf of Mexico (mb50.wordpress.com)
Helix ROV Support Vessel Ready for North Sea
Helix Energy Solutions Group’s newbuild charter ROV support vessel, Grand Canyon, recently completed sea trials and is ready to begin operations in the North Sea. During the sea trials the vessel’s propulsion system, dynamic positioning system and all her cranes were tested.
The vessel recently completed its outfitting in Norway after the initial hull construction was completed in Turkey. Grand Canyon is capable of launching five ROVs at once and will be operated by Helix ESG’s robotics subsidiary, Canyon Offshore.
The vessel will be the new home for another recently completed asset, the T1200 trenching unit. Used primarily to bury large diameter power cables leading from offshore windfarms, the T1200 is also capable of working on oil and gas projects to bury production pipelines.
The Grand Canyon was designed to provide a high capacity, stable working platform for lay, burial and general offshore construction work while still retaining a shallow draft, which is crucial when operating close to the coastline, and common in the renewable energy sector.Grand Canyon’s DP3 capability allows her to operate in any sector, providing offshore support in a wide variety of roles.
The vessel’s deck structure is specifically designed to accept trenching and flexible pipe or cable lay systems for safe and efficient mobilizations. A key focus throughout the design and build of Grand Canyon was to optimize the vessel and equipment design to facilitate efficient mobilizations.
Helix ROV Support Vessel Ready for North Sea | Offshore Energy Today.
- ROV Support Vessel Grand Canyon Completes Sea Trials (Norway) (worldmaritimenews.com)
- North Sea Rig Rates May Push Higher as Midwater Market Heats Up (gcaptain.com)
- UK: Helix Well Ops Charters Skandi Constructor from DOF Subsea (mb50.wordpress.com)
Forum Subsea Deploys Perry T-1200 Trencher in UK
Forum Subsea Technologies, a business line of Forum Energy Technologies, Inc. announces the completed deployment and successful operation of the new Perry T-1200 Trencher for Canyon Offshore, a subsidiary of Helix Energy Solutions Group.
The T-1200 is mobilized to bury power cables at Sheringham Shoals, an offshore wind farm in the United Kingdom that is owned equally by Statoil and Statkraft through joint-venture company Scira Offshore Energy Limited. The wind farm, which is currently under construction, has 88 wind turbine generators, located 17 to 23 km offshore from the coastal town of Sheringham, North Norfolk.
Perry trenching systems are recognized by many clients as a market leader in this technology due to their design, reliability and capability and have been successfully utilised in challenging trenching environments throughout the world. The T-1200 Trencher is an update of the successful T-750 trencher also owned and operated by Canyon Offshore since 2004.
Forum Subsea Technologies is a business line of Forum Energy Technologies, Inc. Their ROV product line ranges from electric observation class ROVs to large hydraulic work-class vehicles used for inspection, survey and deep-water construction, as well as other remote intervention technologies and services. Forum Subsea Technologies is positioned to support its customers through a global sales team and a worldwide network of distributors and service centres.
Forum Energy Technologies Inc.,headquartered in Houston, Texas, is a global provider of manufactured technologies and applied products to the energy industry. With approximately 3,300 employees located throughout the world, Forum is well positioned to provide the products and technologies essential to solving the increasingly complex challenges of the subsea, drilling and production sectors of the oil and gas industry.
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