Services > Missions Pipes and flooded tunnels inspection Pipe visual inspection (internal and external) 3D modelling and pipe profiling Thickness measurement Use case Inspection of the water main between Crépieux water treatment plant and Bruyères tank Grand Lyon, France - 2016 Within the framework of structural and operational assessment of the Grand Lyon's water supply network, Subsea Tech carried out the inspection of two DN800 water mains located between a production plant and a stroage tank. Thanks to the pipe profiling system embedded on a mini-ROV, 3D profiles of the pipes were created over 100m length. Thickness measurements were also realized with a Cygnus US gauge mounted on the ROV. Objectives Visual inspection, profiling and thickness measurement of the water mains Used equipment MiniROVCygnus MiniROV Mini-ROV GuardianMini-ROV Guardian 831A