Alexandre Duran, Naval Architect, Nautilus Marine Consultants talks about the advances in newbuild FPSO hull design

1. RATIONAL DESIGN OF FPSO HULLS
Advances in new-build FPSO hull design
Alexandre DURAN
NAUTILUS MARINE CONSULTANTS PTE. LTD.
20 Cecil Street, #14-01, Equity Plaza, Singapore 049705
Singapore, 28 September 2010

2. Introduction
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3. SHIP-SHAPED OFFSHORE UNITS
F FLOATING
P PRODUCTION
S STORAGE
O OFFLOADING OPERATIONS
Rational design of FPSO Hulls
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4. MODERN FPSO HULL CONCEPTS
NEW BUILD HULL DESIGN PARAMETERS
The RATIONAL FPSO Hull Concept
FUNCTIONAL FLOATER
PRODUCTION REQUIREMENTS
STORAGE OPTIMIZATION
OPERATIONAL CHARATERISTICS
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5. Floater Concept
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6. SPECIFIC HULL LINES
Functional hull design for an FPSO:
Balanced hull shape
minimal TPC variation between min and max drafts
Smaller volumes Fore and Aft
effectively reduce bare hull weight
Reduced Fore and Aft volumes
act to minimize Still Water Bending Moments
Aft end is specifically shaped
for optimal on-site environment directionality
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7. BALANCED FLOATER
Hydrostatic Stability
Longitudinal
Evolution of LCF vs. LCB center of
for trim = 1% (by the bow) buoyancy
173.00 Longitudinal
center of
LCF waterliner
172.50
LCB
172.00
171.50
Center (m)
171.00
170.50
170.00
169.50
169.00
15.000 16.000 17.000 18.000 19.000 20.000 21.000 22.000 23.000 24.000 25.000
Draft (m)
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8. Production Requirements
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9. HULL PROCESS TANKS
Include Process Functions in the Hull
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10. PRODUCTION CHEMICALS
Self-Supporting Tanks
Inside Hull
Stainless Steel
Non-Structural
Flush Interior
Segregated
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11. Storage Optimization
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12. HULL VOLUME UTILIZATION
Optimizing Hull Volumetric Parameters:
Minimum water Ballasting
Only FWD and AFT ballast tanks
for static balancing of FPSO
Process Deck
“Oil Ballasting” Philosophy 2M bbls storage
CO quasi-static balancing
between loading and offloading sequences
“Parcel” storage capacity
Full load for an FPSO ≠ Full load for a Tanker
“Dry Belt” Concept
Cargo Hold Zone is free of ballast tanks
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13. CARGO CAPACITY
Offloading philosophy
Dictates Storage Requirements
Typical example for a 2Mbbl Storage Capacity FPSO
Minimum
volume
needed:
1,732,000
bbl
82 h 28 h 114 h
4h
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th A.DURAN

14. Operational Characteristics
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15. “OIL BALLASTING” PHILOSOPHY
“Dry Belt” benefits
Reduced ballast deadweight = More cargo capacity
Void spaces only
Corrosion resistance Dry belt
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16. CORROSION ISSUES
Problem:
Corrosion in Ballast tanks
BHD next to Cargo Tanks
Reason:
Higher temperature in Corrosion witnessed after
5 years on new build FPSO
seawater environment
stimulates corrosive attack by
increasing the rate of
electrochemical reactions and
diffusion processes
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17. Corrosion Solutions
“Dry Belt” Solution
No ballast = non-corrosive environment in void spaces
Wing tank is protected Wing tank is highly
against corrosion susceptible to corrosion
high temperature gradient at BHD
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18. Other Innovations
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19. MOORING DESIGN
Mooring pattern of FPSO is fixed
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20. SIMPLIFIED DESIGN
Design innovations
Rational
Functional
Simplified
Example:
Mooring Fairleads
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21. FUNCTIONAL DESIGN
Multi-purpose riser porch
May be used for:
Pulling OOL
Pulling Risers
Pulling Umbilicals
Material Handling
Hydrate Remediation
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22. RATIONAL DESIGN
Multi-function riser porch
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23. PRACTICAL DESIGN
On-board
Coiled Tubing Intervention
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24. Conclusion
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25. RE-SHAPED OFFSHORE UNITS
F FLOATING
P PRODUCTION
S STORAGE
O OPERATIONS
Rational design of FPSO Hulls
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26. Future Challenges
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27. DESIGN FOR THE FUTURE
Rational Design of / for:
Hull Shape / Size Constructability
More Stringent Specifications Safety
Technical Challenges Ecology / Carbon Footprint
Deeper Waters Economy
Harsh Environments Operational Efficiency
New Technology Fast Track Projects
Operational Requirements Scale of Projects
Etc.
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28. Thanks
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29. Questions?
Alexandre DURAN
NAUTILUS MARINE CONSULTANTS PTE. LTD.
20 Cecil Street, #14-01, Equity Plaza, Singapore 049705
duranalex@live.com +65 9115 1830
Singapore, 28 September 2010