FPSO Ballast Tank Class Inspection using mini-ROVs

Summary of Benefits
•  Efficient surveys – project durations can be reduced by up-manning to 24 hour operations or 2 work fronts.
•  Longer dive times (compared to divers) :

•  No dive time limits
•  Quick deployments and permit processes
•  Higher operating limits – Wave Height 4 m and 2 knot current- diving normally ceases at Hs 3m and
1 knots)
•  ROV configured to complete multiple tasks in one dive to reduce reconfiguration, multiple dives on
one component: water blasting, CP and visual inspection (HD video).

•  Reduced team sizes (3-4 POB compared to > 8 POB plus client rep for divers )
•  Eliminating support vessels, significantly reducing operational costs and disruption to operations.
•  Reduced costs – over 3 times cheaper than (asset deployed) divers
•  Eliminating HSEQ Risk – removing divers/manned entry.
•  Rapid mobilization – air freight.
•  Improved data quality
•  Integrated Geo Oceans and Vertech Group – Single contractor with multidiscipline ROV, tank, hull and
rope access offshore inspection team
•  Zero downtime – Flexible deployment options and scopes to coordinate fallback work (e.g. tanks) in times
of poor weather

Mini-ROV Class Survey System – Asset Deployed ROV Technology

Each Mini-ROV Class Survey System (CSS) for asset deployed remote hull UWILD and tank

Class inspection consists of the following technology components:

ROV
2 x Teledyne Seabotix vLBV300 ROV
Advanced spares and tool kit
Fibre Optic Tether Termination / Repair Kit
vLBV300 Hull Crawler Unit (vLBC)
Magnetic stabilisation system
1 x 300m ROV deck Lead and 3 x subsea tethers
ROV Launch and Recovery System
ROV Tether Management System inc. tight line installed aft to fwd
Digital Video Recorder (Digital Edge) and Data Management

Cameras
2 x HD Cameras
3 X SD tooling cameras
Stereo 3D Camera System (modelling)
Probe camera (22mm OD with 4 m spool)

Navigation
Scanning Sonar
Sonar reflectors

Cleaning
5000 psi High Pressure Water Blaster
Mechanical Sport Cleaning Tool

Tools
Two Function Actuator Arm
Grabber Arm
Chain Calliper / Gauge

NDT / Sensors
A-scan Ultrasonic Thickness Probe
Cathodic Protection Contact Probe
Cathodic Protection Proximity Probe
Inclinometer

Mini-ROV Class Survey System Technology

Other technology integrated with the Mini-ROV CSS:

NDT / Sensors
ACFM weld crack defects
C-scan UT – corrosion mapping
TOFD
Leak detection
Water quality profilers (e.g. ADCP)

Tools
Penetration isolation plugs
Torque tool
Seabed sediment collection

Navigation / Survey
Survey-grade positioning
Multi-beam sonar
Laser scanner or profiler

Cleaning tools
Cavitation cleaner
Mechanical scraper