Subsea 7 Utilise C-Worker 7 Autonomous Surface Vessel In Mediterranean Operation
Wednesday 24 January 2018
ASV Global is delighted to announce the successful deployment of one of its C-Worker 7 class of autonomous surface vessels for Subsea 7. The 7m autonomous surface vessel was used to support a pipelay operation off the coast of Egypt.
Fitted with a survey suite comprising a multibeam echosounder and side scan sonar, the C-Worker 7 carried out touchdown monitoring in support of the Seven Antares pipelay vessel.
The C-Worker 7 operated for a total of 37 days. Use of the autonomous C-Worker 7 replaced the need for an additional survey vessel resulting in significant cost savings. The C-Worker 7 also provided greater operational flexibility due to its superior endurance and improved availability compared to an equivalent manned vessel.
In addition, use of the C-Worker 7 resolved the technical challenge of surveying in very shallow waters whilst also removing the risk to personnel working at sea in small craft.
A custom payload frame was designed to house the specified survey suite. The modular frame slotted into the C-Worker 7’s moonpool to mount and deploy the sensors. Extensive testing confirmed that repeated sensor deployment was achieved within millimetre accuracy ensuring that no further survey sensor calibrations were required. Vessel trials and testing took place in the Solent, UK before the vessel was mobilised from ASV’s UK facility.
Throughout the operation the C-Worker 7 was controlled and monitored using the ASView control system from a control station set up onboard the Seven Antares. Subsea 7 Survey personnel piloted the C-Worker 7 and operated the survey sensors to ensure data accuracy and quality.