Inspection
Our Scope and Activities
ROV Inspection Applications
- Hydro Power and Dam Flooded tunnel surveys
- Offshore construction support
- Cable and pipeline surveys
- Marine growth removal
- Offshore wind farm and renewables
- Salvage location search and survey
- Archaeological site surveys
ROV Configurations
Tunnel Survey
Tilting Lights
Profile sonar
Altimeter
Thickness measurement
Low light cameras
Laser scaling
Cable Tracking
Magnetometer
USBL
3D Visualisation
Tilting cameras and lights
Diffused Lighting
4K /1080p
Laser scaling
Construction support
Multibeam sonar
Rear camera
CP
Gripstick
Optical Gyro
ROV Peripherals
Seaeye Falcon
- Choice of umbilical winches; 340m,1120m fibre optic cable
- Lock latch launch / recovery system
- 1Gb Ethernet dedicated fibre
- Multibeam Sonar USBL Tracking
- Umbilical tension monitoring
- Fitted control van - towable to site
ROV Sensor Pick List
- Video Formats
- 3G / 6G
- HD/SDI
- 1K /4K
- PAL Composite
- HD Digital Stills
- 3D Photogrammetry
- Diffused LED lights
- Tilting lights
- Bathymetry
- Ultrasonic Thickness
- Photogrammetry
- Laser Scaling Dots
- Profiling Sonar
- Doppler Velocity Log
- USBL
- Cable Tracking
- Multibeam Sonar
- Single Beam Sonar
- Ethernet 1GB
- Auxiliary Survey Pod:
- 4 x Ethernet
- 4 x Camera
- SeaEye Bus
- 485/232
- Laser Scaling
- Umbilical tension monitoring
- Tilting Lights
- Aft umbilical attachment
ROV Tunnel Survey
To survey inclined water filled tunnels 4.5m diameter to depth of 400m
Negotiate bifurcation at 280m depth
To survey horizontal water filled tunnel diameter 7m and length 950m to depth of 30m
Inspect quadrification passages at 950m distance, 2.5m wide by 2.5m high
Inspect variety of built features at various points.
- Determine ROV position in the tunnel with respect to a datum
- Locate individual features of interest at specific locations
- Manage umbilical over the distance
- Ensure sufficient lighting to record clear video along prescribed paths
- Falcon ROV c/w with Fiber Optic upgrade & 400m depth upgrade
- Imagenex sonar to locate landmark features
- Continuous colour video with frame grab
- On screen captioning
- Umbilical winch odometer to record distance from Datum
ROV Cable Survey
To inspect electricity supply cables between islands in the Aegean
Work at water depths from shore to 390m
Determine the position of the cable
Follow the path of cables where buried
Record track of ROV precisely
- Transport System by Airfreight
- Mobilise on Client vessel
- Operate at 390m
- Locate the cable
- Determine cable position
- Manage the umbilical cable
- Ensure sufficient lighting to record clear video along prescribed paths
- Falcon ROV c/w with Fiber Optic upgrade & 400m depth upgrade
- Continuous colour video with frame grab
- Electric powered umbilical winch
- Smartrak 9 cable detection system
- USBL positioning linked to DGPS
- Qinsy survey software
Photogrammetry
Newly discovered cracks in the brick lining of a sluice which has been in operation over 130 years
Cracking is circumferential around the axis of the tunnel
Cracks are highly irregular in path and width.
Measurements to be taken at six month intervals to evaluate rate of expansion
Measurements by hand are subject to accurately measuring across the same points
- To make successive measurements on points reliably
- To measure any crack wider than 2mm
- To measure the depth at locations
- Achieve equally good data on floor, walls & roof arch. Given 3D imaging is the solution
- Provide adequate lighting without creating shadows
- Develop and build suitable camera system
- Ensure correct camera settings for light conditions
- Digital photogrammetry - Create a 3D model of the ‘crack‘
- Diffused lighting reduces shadows
- Remote control of camera settings allows adjustment ‘on the fly’
- The yellow rectangle is placed as a scaling reference. In this case a 100mm square.
- This model is a 3D composite from over 1500 images
