Alexduran Final 120502034627 Phpapp02

7/31/2019 Alexduran Final 120502034627 Phpapp02

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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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2 11thAnnual FPSO Congress, Singapore, 28 September, 2010 A.DURAN

Introduction

2 -


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SHIP-SHAPED OFFSHORE UNITS

F

P

S

O

FLOATING

PRODUCTION

STORAGE

OFFLOADING OPERATIONS

Rational design of FPSO Hulls


4/294 11thAnnual FPSO Congress, Singapore, 28 September, 2010 A.DURAN

MODERN FPSO HULL CONCEPTS

NEW BUILD HULL DESIGN PARAMETERS

TheRATIONALRATIONAL FPSO Hull Concept

FFUNCTIONAL FLOATER

PPRODUCTION REQUIREMENTS

SSTORAGE OPTIMIZATION

OOPERATIONAL CHARATERISTICS



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



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



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

Documents

Alexduran Final 120502034627 Phpapp02