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Subsea
DOF Subsea Atlantic Region
Bergen Aberdeen Oslo
DOF Subsea was established in 1979. Main office is located in Bergen, Norway.
Geoconsult, purchased by DOF ASA in May 2005, changed name to DOF Subsea
Norway in September 2007.
The company now has Offices in Bergen, Aberdeen, Luanda, Accra and Oslo (Semar).
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Subsea
DOF Subsea Atlantic Personnel
Geophysicists
Geologists
Data Processors
Surveyors
Hydrographic Surveyors
Carthograpers
Technical drafters
GIS experts
ROV pilots
Cswip 3.4u Engineers/Coordinators
Engineers
Subsea
DOF Subsea Atlantic Fleet
Skandi Achiever Skandi Singapore Skandi Neptune Skandi Skansen
Diving Support Vessel
STX DSV06
Built - 2007
LOA - 105.9m
Breadth - 21.0m
Draught - 6.6m
Deck - 735m²
Offshore Crane - 140t
Accommodation - 100
Triton XLX WROV x 2
Portable LARS x 2
Air diving system - depth
rating 50 MSW
Saturation diving - depth
rating 350 MSW
Sat diving spread - 18
Diving Support Vessel
STX DSV06
Built - 2011
LOA - 107.1m
Breadth - 21.0m
Draught - 6.6m
Deck - 900m²
Offshore Crane - 140t
Accommodation - 100
Triton XLX WROV x 2
Portable LARS x 2
Air diving system - depth
rating 50 MSW
Saturation diving - depth
rating 350 MSW
Sat diving spread - 18
Construction Support Vessel
CONV MT6016
Built - 2001
LOA - 104.2m
Breadth - 24.0m
Draught - 6.3m
Deck - 1180m²
Offshore Crane - 250t
Accommodation - 106
Schilling UHD WROV x 2
Moonpool 7.2 x 7.2m
Mooring Installation Vessel
AH 04
Built - 2011
LOA - 107.2m
Breadth - 24.0m
Draught - 7.8m
Deck - 970m²
Deck Capacity – 1840t
Offshore Crane - 250t
Accommodation - 90
Schilling UHD WROV x 2
Moonpool 7.2 x 7.2m
Bollard Pull - 349t
A-Frame - 350t
Chain Locker 4 x 299m³
Shark Jaws 3 x 800t
Subsea
DOF Subsea Atlantic Fleet
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Geosund Skandi Seven Skandi Constructor Skandi Iceman
Light Construction Support
Vessel
UT 745
Built – 2001/2006
LOA - 98.5m
Breadth - 18.8m
Draught - 5.9m
Deck - 720m²
Deck Capacity - 1200t
Offshore Crane - 100t
Accommodation - 88
Schilling UHD WROV x 2
Moonpool 7.1 x 6.0m
Construction Support Vessel
STX OSCV 03
Built - 2008
LOA - 120.7m
Breadth - 23.0m
Draught - 7.0m
Deck - 1300m²
Deck Capacity - 3150t
Offshore Crane - 250t
Accommodation - 119
Triton XLX WROV x 2
Moonpool 7.2 x 7.2m
Light Construction Support
Vessel
SX121
Built - 2009
LOA - 120.2m
Breadth - 25.0m
Draught - 8.0m
Deck - 1470m²
Deck Capacity - 1600t
Offshore Crane - 140t
Accommodation - 100
Triton XLX WROV x 2
Moonpool 8.0 x 8.0m
Mooring Installation Vessel
VARD AH12
Built - 2013
LOA - 93.6m
Breadth - 24.0m
Draught - 7.8m
Deck - 780m²
Deck Capacity - 2300t
Accommodation - 45
Triton XLX WROV x 1
Bollard Pull – 280t
Chain locker 4 x 250m³
Shark Jaws x 800t
Subsea
ROV
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DOF Subsea operates over 62 ROVs in its fleet
5 new ROVs on order
Work class ROV systems (UHD / Triton)
Inspection Class ROV Systems (Comanche and Tiger)
Most vessels have two dedicated built-in systems
2 AUVs (Kongsberg Hugin) for seabed mapping and inspection
2 FOCUS II ROTVs
Subsea
DOF Subsea ROV Fleet
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Seaeye Tiger Schilling HD Schilling UHD
Kystdesign Triton XL Triton XLX
Subsea 14
Desktop Study
Route Survey
UXO Survey
Clearance Survey
Prelay Survey
Geotechnical Survey
Cable Lay/Trenching
Cable detection survey
Geophysical Seabed Mapping
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• ROV Surveys
• INS on all survey projects since 2003
• Dual Head MBE, R2Sonic and Reson 8125
• Edgetech SSS/SBP, HD Video
• Advanced processing of INS and compilation of all
aquired data
• Delivery of all data in NaviModel and GIS
Geophysical Seabed Mapping
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• AUV operations
• Hugin 1000, 3000 meter depth capability
• Modular variable length mid section for batteries and
sensors.
• System Sensors: Kongsberg EM2040 MBE, Edgetech
2200 SSS/SBP, advanced forward looking Sonar,
Doppler Aided Navigation System, Digital Stills
camera.
• Terrain following and Collision Avoidance system.
• Pressure tolerant rechargeable Lithium-Polymer
Battery System.
• Mission Endurance 22 hours.
Deep Water Geohazard Lines
Continental Shelf
Continental Slope
Shelf Breakline
Slope Baseline
Pipeline/Cable Inspections
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• Using Dual Head MBE for better data coverage over
pipeline
• Use INS on all our ROV and ROTV operations to
achive better positioning data to improve the overall
data quality.
• System Sensors: R2Sonic 2024 MBE, Edgetech SSS,
Pipetracker, Doppler Aided Navigation System, HD
video.
• Processing solution NaviModel and Visualsoft.
• Project deliveries in NaviModel, Visualsoft and/or
SSDM GIS deliveries.
Structure Inspections
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• General Visual Inspection
• Close Visual Inspection
• Flooded Member Detection
• Marine Growth Measurement and Removal
• UT Testing
• Phase Ray/Eddy current Inspection of flexible flowlines
and gas lift lines
• Cathodic Potential Measurements with Stab and
Proximity equipment
• UV tracer leak detections
• Cswip personnel
Survey & Positioning Services
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• Typical Survey Services
• Construction support
• Subsea positioning
• Metrology - acoustic
• Metrology - theoretical
• 3D/4D Visualisation Software
• Rig move / structure tow out / installation
• Acoustic array installation
• Dimensional control Services
• Laser scanning
• Data processing
Pre-Lay Route Survey 2016
• Grapnel Hook to remove cables from route
• Gather detailed geophysical and video data from
the two centrelines using ROV mounted systems
(362km x 2 passes)
• Expand hairpin joint survey area with Hull based
MBE and SBP
• UXO survey and removal of potentially
hazardous targets within the corridor
• Geotechnical Sampling (CPT/Vibrocore)
DOF Subsea 22
DOF Subsea 29
Internal Reflector within Sandwave Area
Isopach map with burial depth to internal reflector
DOF Subsea 36
SBP data example of compressional structure related to collapse
structures from MBE data observed on the seabed