INTER-ARRAY CABLE INSTALLATION
FEATURE SPONSOR
SUCCESSFUL DEPLOYMENT ON RACE
BANK OFFSHORE WINDFARM PROJECT Coda Octopus are delighted to report successful deployment of the Echoscope real-time 3D sonar system on the Race Bank offshore windfarm project by DeepOcean
The Echoscope was used for a vast number of tasks including live cable touch-down monitoring and position recording, monitoring of first and second end pull-ins, cable-cut marking and survey of the as-laid inter-array cables.
FIRST PHASE
continuous monitoring of the cable, carrying out live measurements between the cable, the sea-bed and the monopole to ensure the pull-in operation could be completed safely and effectively without any risk of cable damage.
Following extensive trials in early 2016, DeepOcean deployed the Echoscope complete with Integrated Pan and Tilt dual axis rotator on the Deep Helder for the first phase of the Race Bank project in late 2016. The company required a system which could continuously generate images of the inter-array cable during installation irrespective of water visibility.
The system is a real-time 3D volumetric imaging and mapping sonar, which generates 3D images instantly on the topsides software, Underwater Survey Explorer (USE). When coupled with an accurate RTK position and attitude sensor the system can also be used as a hydrographic survey and mapping tool, providing instant bathymetric data without the requirement for post-processing.
PRIMARY TASK
The image of the cable was generated on the Coda Octopus software Underwater Survey Explorer on the Deep Helder and instantly transmitted to the cable installation vessel using an NCentric wireless link. This gave both the survey team on the Deep Helder and the installation team on the cable lay vessel access to the same real-time 3D information.
CABLE TOUCH-DOWN IMAGING AND POSITION RECORDING
Following successful completion of the first phase of the Race Bank project, the team re-deployed to the second phase of Race Bank where the same set-up was used. As the projects developed, the installation and survey teams relied less on the ROV supplied data and more on the Echoscope data.
The system was utilised on a range of additional tasks which included… » Providing cable cut-marker positions » As-laid cable surveys » Structure and scour protection inspection
» Monitoring the quadrant during laydown
» Omega scan and correction and producing 3D volume rendered mapping of the as-laid cable
BENEFIT
Overall the Echoscope real-time 3D data reduced the reliance on the ROV support, ensuring operations could continue in unfavourable weather, current and visibility conditions, saving time and helping DeepOcean deliver a valuable project for Dong Energy.
In addition to monitoring the cable during the pull-in process, the system was used to monitor the cable touch-down position during the cable lay process. The touch- down point was recorded and output to the Deep Helder navigation platform, providing a real-time feed of the cable position. This removed any requirement to survey the as-laid position of the cable after installation, saving vessel time and cost. On the Race Bank project the team were able to benefit from the recent USE V7 software updates which included an improved measurement tool, improving the efficiency of the monitoring and recording operation.
SECOND PHASE
Initially, the primary task for the Echoscope was to provide images of the cable during the first and second end pull-ins. The system’s unique ability to generate real-time 3D data gave the installation teams a tool which enabled
82
www.windenergynetwork.co.uk Coda Octopus
DELIVERING AT A COMPETITIVE PRICE Blair Cunningham, Coda Octopus President of Technology stated: “Offshore Wind projects rely on innovative technology to reduce the installation costs and deliver renewable energy at a competitive price for the consumer.
“DeepOcean’s successful use of the Echoscope on the Race Bank and Bligh Bank projects has shown the versatility and wide range of tasks which can be completed with a single system, reducing reliance on ROVs, generating planning certainty and reducing cost for the project.”
WEBSITE
PRODUCTION
EMAIL
SCAN/CLICK
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83
