a step change in subsea installation
TRANSCRIPT
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Subsea Deployment Systems Ltd.
A LOW RISK, LOW COST METHOD FOR THE
INSTALLATION OF SUBSEA STRUCTURES
A STEP CHANGE IN SUBSEA INSTALLATION
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Subsea Deployment Systems Ltd.
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The Task
• Large structures
• Deep water
• Hostile environments
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Subsea Deployment Systems Ltd.
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Installation Problems
• Vessel capacity
• Weather restrictions
• Vessel availability
• Schedule constraints and delays
• Cost
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Subsea Deployment Systems Ltd.
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The Subsea Deployment System
• Simple, safe
• Water depth 80m to 3000m
• Capacity 100t to several 1000t
• Essentially independent of weather
• Low cost
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Subsea Deployment Systems Ltd.
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SDS Key Differences
• Structure connected to a buoyancy frame
• Submerged tow to site
• Payload depressed to seabed
• Negligible dynamic loading
• Very soft set-down
• No “point of no return”
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Subsea Deployment Systems Ltd.
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The Tool / System Main Components
PATENT
GB2464714
PCT/GB2009/051383
CONTROL CHAIN
CONTROL CHAIN TOWER
TOW CHAIN CLUMP WEIGHT
CASTLE
TOW BRIDLE
STRUCTURE
SOLID BUOYANCY
FULLY FLOODABLE
HULL
(OPTIONAL)
TRANSVERSE
SUPPORT FRAME
BALLAST LOCKER
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Subsea Deployment Systems Ltd.
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Control Chain Towers
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Subsea Deployment Systems Ltd.
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Dynamics
• Natural period > 120s
• Response < 20% of vessel motions (regular waves)
• Minimal dynamic loading
• Low set-down velocity (< 0.1m/s)
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Subsea Deployment Systems Ltd.
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Operating Window
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Subsea Deployment Systems Ltd.
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Operation
Tow
• Shallow surface tow
• Deep surface tow
• Transition
• Submerged tow
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Subsea Deployment Systems Ltd.
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Operation
Parking
• Lower clump
weight
• System floats
above seabed
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Subsea Deployment Systems Ltd.
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Operation
Installation
• Lower control chains
• Position
• Lower to seabed
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Subsea Deployment Systems Ltd.
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Operation
Ballast
• Install ballast weight to
balance the payload
weight
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Subsea Deployment Systems Ltd.
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Operation
Disconnect
• Activate release system
• Reconnect control chains
• Raise chains
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Subsea Deployment Systems Ltd.
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Inherent Safety
• Critical operations avoided offshore
• Operations can be suspended at any time
• Insensitive to weather changes
• Negligible dynamic loading
• Reduced risk of catastrophic failure
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Subsea Deployment Systems Ltd.
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Tank Test
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Summary
• Installation and decommissioning
• Basic proven technology
• Low risk / inherently safe
• High capacity
• Deep water & harsh environments
• Low cost
• Good solutions are simple
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Subsea Deployment Systems Ltd.
A STEP CHANGE IN SUBSEA
INSTALLATION