Vedam VEDAM DESIGN & TECHNICAL CONSULTANCY PVT. LTD , Acropolis, Military Road, Marol, Andheri (E), Mumbai-59, INDIA , 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

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 vessel’s 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

Design & Technology Center Vedam

Design & Technology Center Vedam Field Survey Anchor Pattern Mooring Analysis CLIENT/MWS

Design & Technology Center Vedam

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

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

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,

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

Design & Technology Center Vedam  Deployed wire length  Initial tension in the wire  Load on Anchor  Location and size of DP buoys  Load on vessel’s mooring fittings  Safe navigation zone around moored vessel

Design & Technology Center Vedam  Limiting Vessel excursion  Distance from pipe lines  Distance from floating bodies  Uneven distribution of spread mooring  Support from Jacket Leg

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

Design & Technology Center Vedam  Limiting vessel roll & pitch motion  Limiting vessel’s 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

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

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

Design & Technology Center Vedam  Analysis with extreme weather condition  Derivation limiting weather condition for safe working condition  Contingency plan beyond limiting weather

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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