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Singapore, 28 September 2010
NAUTILUS MARINE CONSULTANTS PTE. LTD.20 Cecil Street, #14-01, Equity Plaza, Singapore 049705
RATIONAL DESIGN OF FPSO HULLS
Advances in new-build FPSO hull design
Alexandre DURAN
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Introduction
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SHIP-SHAPED OFFSHORE UNITS
F
P
S
O
FLOATING
PRODUCTION
STORAGE
OFFLOADING OPERATIONS
Rational design of FPSO Hulls
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MODERN FPSO HULL CONCEPTS
NEW BUILD HULL DESIGN PARAMETERS
TheRATIONALRATIONAL FPSO Hull Concept
FFUNCTIONAL FLOATER
PPRODUCTION REQUIREMENTS
SSTORAGE OPTIMIZATION
OOPERATIONAL CHARATERISTICS
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Floater Concept
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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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BALANCED FLOATER
Hydrostatic Stability
Evolution of LCF vs. LCB
for trim = 1% (by the bow)
169.00
169.50
170.00
170.50
171.00
171.50
172.00
172.50
173.00
15.000 16.000 17.000 18.000 19.000 20.000 21.000 22.000 23.000 24.000 25.000
Draft (m)
Center(m)
Longitudinal
center of
buoyancy
Longitudinal
center ofwaterliner
LCF
LCB
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Production Requirements
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HULL PROCESS TANKS
Include Process Functions in the Hull
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PRODUCTION CHEMICALS
Self-Supporting Tanks
Inside Hull
Stainless Steel
Non-Structural
Flush Interior
Segregated
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Storage Optimization
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2M bbls storage
Process Deck
HULL VOLUME UTILIZATION
Optimizing Hull Volumetric Parameters:
Minimum water Ballasting
Only FWD and AFT ballast tanks
for static balancing of FPSO
Oil Ballasting Philosophy
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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82 h 28 h 114 h
Minimumvolumeneeded:
1,732,000
bbl
4 h
CARGO CAPACITY
Offloading philosophyDictates Storage Requirements
Typical example for a 2Mbbl Storage Capacity FPSO
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Operational Characteristics
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CORROSION ISSUES
Problem:
Corrosion in Ballast tanks
BHD next to Cargo Tanks
Reason:
Higher temperature in
seawater environment
stimulates corrosive attack by
increasing the rate of
electrochemical reactions and
diffusion processes
Corrosion witnessed after
5 years on new build FPSO
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Corrosion Solutions
Dry Belt SolutionNo ballast = non-corrosive environment in void spaces
Wing tank is highly
susceptible to corrosion
Wing tank is protected
against corrosion
high temperature gradient at BHD
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Other Innovations
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MOORING DESIGN
Mooring pattern of FPSO is fixed
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SIMPLIFIED DESIGN
Design innovations
Rational
Functional
Simplified
Example:
Mooring Fairleads
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FUNCTIONAL DESIGN
Multi-purpose riser porch
May be used for:
Pulling OOL
Pulling Risers
Pulling Umbilicals
Material Handling
Hydrate Remediation
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RATIONAL DESIGN
Multi-function riser porch
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PRACTICAL DESIGN
On-boardCoiled Tubing Intervention
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Conclusion
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RE SHAPED OFFSHORE UNITS
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RE-SHAPED OFFSHORE UNITS
F
P
S
O
Rational design of FPSO Hulls
FLOATING
PRODUCTION
STORAGE
OPERATIONS
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Future Challenges
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DESIGN FOR THE FUTURE
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DESIGN FOR THE FUTURE
Rational Design of / for:
Hull Shape / Size
More Stringent Specifications
Technical Challenges
Deeper Waters
Harsh Environments
New Technology
Operational Requirements
Etc.
Constructability
Safety
Ecology / Carbon Footprint
Economy
Operational Efficiency
Fast Track Projects
Scale of Projects
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Thanks
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Singapore, 28 September 2010
NAUTILUS MARINE CONSULTANTS PTE. LTD.20 Cecil Street, #14-01, Equity Plaza, Singapore 049705
Questions?
Alexandre DURAN
[email protected] +65 9115 1830