Safe Practice for Vessel Positioning With Mooring Analysis(Orcaflex)
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Transcript of Safe Practice for Vessel Positioning With Mooring Analysis(Orcaflex)
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Vedam
VEDAM DESIGN & TECHNICAL CONSULTANCY PVT. LTD.
504-506, Acropolis, Military Road, Marol, Andheri (E), Mumbai-59, INDIA
+91-22-67109192 , +91-22- 67257237 [email protected], www.vedamindia.com
Design & Technology Center
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Design & Technology Center
Vedam
Challenges in present Station Keeping
Mooring Analysis A glance
Mooring Analysis Usage
Mooring Analysis Stages, Categories
Advantage with FUGRO-Vedam collaboration
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Design & Technology Center
Vedam
Complex platform and sub-sea infrastructure
Vessel positioning in close proximity to assets
Stringent safety requirement
Longer mooring durations
Operational requirement: gangway connections, helicopter operations
Vessel response under accidental damage of a line
Support vessels movement in close proximity to barge
Unconventional requirements: Connection to Jacket leg, DP buoys etc..
MOORING ANALYSIS IS A TOOL TO SIMULATE COMPLEX NATURE OF STATION KEEPING
TO ENSURE SAFETY AND REDUCE RISK DURING OFFSHORE OPERATION
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Design & Technology Center
Vedam
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Design & Technology Center
Vedam
Field
Survey
Anchor
Pattern
Mooring
Analysis
CLIENT/MWS
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Design & Technology Center
Vedam
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Design & Technology Center
Vedam
Motion analysis & determining RAO
Modelling of mooring pattern
Quasi-static Mooring Analysis (equilibrium
position)
Rule Check as per API/ISO/DNV
Standards
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Design & Technology Center
Vedam
Catenary shape & positioning of mooring
buoy
o Safe vertical distance from sub-sea
pipelines
o Limiting anchor loads
o Chain lengths for DP buoys
One line Damage analysis
o Limiting line tensions
o Limiting vessel excursions
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Design & Technology Center
Vedam
Transient analysis
o Vessel trajectory after breakage
of a line
o Maximum vessel offsets from
platform/assets.
Detailed Report and Anchor Pattern
with catenary diagrams,
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Design & Technology Center
Vedam
Derivation of exact catenary shapes
Correct estimation of distance between subsea structure and
mooring lines/anchors.
Mooring optimization to meet stringent safety requirement
Stabilisation of vessel motion, excursion
Clash Check
Usage of Damage Prevention Buoys
Derivation of limiting weather
Vessel Relocation Capability
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Design & Technology Center
Vedam
Deployed wire length
Initial tension in the wire
Load on Anchor
Location and size of DP buoys
Load on vessels mooring fittings
Safe navigation zone around
moored vessel
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Design & Technology Center
Vedam
Limiting Vessel excursion
Distance from pipe lines
Distance from floating bodies
Uneven distribution of spread
mooring
Support from Jacket Leg
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Design & Technology Center
Vedam
Effect of different directional
weather
Effect of extreme weather condition
Effect of one line damage condition
Limitation to excursion
Factor of Safety of anchor, line &
mooring fittings
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Design & Technology Center
Vedam
Limiting vessel roll & pitch motion
Limiting vessels heave motion for
Better habitability
Safe operation of gangway, crane etc
Safe platform repair work
Limiting vessel excursion
For position keeping for subsea
repair work
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Design & Technology Center
Vedam
Platform to barge safe distance
Anchor to pipe line distance
Across the pipe
Along the pipe
Mooring line to subsea pipe distance
Line to line distance in cross mooring
Distance from platform helideck or flare
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Design & Technology Center
Vedam
DP Buoy parameters for effective
lifting of mooring line
Location
Capacity or size
Buoy chain length
Catenary shape with effect of DP
buoys
Optimum usage of DP buoys
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Design & Technology Center
Vedam
Analysis with extreme weather condition
Derivation limiting weather condition for
safe working condition
Contingency plan beyond limiting weather
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Design & Technology Center
Vedam
Transient Analysis for relocating
the vessel
Line tension and catenary for
relocation operation
Weather condition for safe
relocation operation
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Marine Consulting | Basic Design | Production Design | Conversion Design | New Building & Repair Supervision | Stability Analysis | Structural FEM Analysis | Mooring Analysis | Shipboard Manuals | Inclining Experiment |
Vedam Design & Technology Center
VEDAM DESIGN & TECHNICAL CONSULTANCY PVT. LTD.
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