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energy engineering
Subsea Dropped Object Analysis
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Content
• Company Background • Subsea Dropped Objects • Current Mitigation Techniques • Subsea Installation Analysis • Finite Element Analysis (FEA) • Computational Fluid Dynamics (CFD) • Case Studies • Questions
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Company Background
• Founded 1999 – Became part of Superior group Dec 2009
• Multidiscipline services – Design – Analysis – Management
• International Resources – Aberdeen, Derby, Houston, Singapore
• Client Orientated – Focus purely on client needs to provide a fast effective service of
the highest quality
Subsea Dropped Objects
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Subsea Asset Protection
• Modern Oilfield – Large subsea infrastructure
• Congested seabed – High Risk of dropped objects impacting and damaging assets
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Current Mitigation Techniques
• DROPS potential consequence table – Lookup table for range of objects with potential to be dropped – Gives approximate drop cone, velocity and impact
• Recommended Practice – DNV-RP-F107 2010 – Probability based quantification of events – Drag coefficients and terminal velocity highly generalised based on
shape
• Explicit Analysis – Use of latest software and analysis techniques – Fully quantify numerical values and potential consequences
Prospect Dropped Object Analysis
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Prospect Drop Analysis Tools
Prospect can provide; • Real world behaviour
– Physics based simulations which replicate real events
• Numbers behind the risks – Mitigation methods can be tested and compared
• Worst case scenarios – Outcomes if the worst does happen
• Front end engineering – Prevent incidents rather than react
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Subsea Installation Analysis
• Simulate an asset during move from vessel to subsea location – Pipe Lay – Cable Lay – Subsea Hardware – Splash Zone Deployment
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Finite Element Analysis (FEA)
• Computer modelling of component stress and deflection • Dropped object impact
– Forces on impact – Visualise outcomes – Quantify events
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Computational Fluid Dynamics (CFD)
• Computer modelling of fluid dynamics and subsequent loading – Determine where a dropped object is likely to land – “Virtual Wind Tunnel” for sea currents – Displacement forces – Objects drag coefficient – Determine an objects likely impact velocity
Case Studies
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Dropped Object - Installation
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Flexible Riser Impact (FEA)
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Subsea Manifold Impact (FEA)
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Subsea Manifold Impact (FEA)
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Subsea Manifold Impact (FEA)
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Questions
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Contact
John Eddie Prospect Cumberland House Endeavour Drive Westhill Aberdeenshire AB32 6UF T: +44 1224 651831 www.prospect-fs.com