Equipped with a multibeam echosounder, the ROV system is being used to perform deep sea bathymetric surveys in the context of a vast seawater air conditioning project.
In June 2012, Cadden supplied Copetech-SM with a complete system for performing high precision deep sea bathymetric surveys. These surveys are being performed in preparation for the SWAC (Sea Water Air Conditioning) project to be implemented in La Reunion by GDF Suez Energy Services.
This energy efficiency project is fully in line with sustainable development principles. Basically, it involves pumping cold seawater from more than 1000 m deep up to the 27 sites to be air conditioned, located in Saint-Denis and Sainte-Marie.
The Marseilles-based engineering consultancy firm was contracted to map a reliable route for the installation of approximately 20 km of subsea pipelines.
High precision surveys at abyssal depths require onboard sensors capable of capturing the data as close as possible to the areas being surveyed. The ROVs carrying the equipment typically weigh nearly one tonne, requiring large vessels for transport.
Copetech-SM, however, developed an original approach and came up with a different solution, which was a decisive factor in their winning the contract. The ROV used is extremely compact. Weighing less than 200 kg, with an adjustable payload from 18 to 40 kg, it can be transported and shipped more easily, significantly reducing the overall cost of operations.
The underwater vehicle sold by Cadden comes with a leased Sonic 2022 multibeam echosounder (R2 Sonic), a Lodestar attitude and heading reference system (Sonardyne) and a Doppler velocity log (LinkQuest).
The SWAC system has already been used successfully in Bora Bora in French Polynesia to provide air conditioning in a hotel. The preliminary deep sea study for that project was conducted by Créocéan, also a Cadden client.