Rules and Regulations for FPSO

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RULES AND REGULATIONS FOR

FPSO

Dr.

Iwan

D. Aryawan

Senior Specialist Naval Architect for Floating

Structures

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PROGRAM

• FLOATING OFFSHORE INSTALLATIONS • FPSO CONCEPT

• RULES AND REGULATIONS FOR FPSO • RULES BASED ASSESSMENT

– Overview

– Hull Structures

– Positional Mooring • CLOSING REMARKS

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FLOATING OFFSHORE INSTALLATIONS

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Some Driving Factors

• Water depth

• Infrastructures around the field development • The size of the reservoir

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Floating Offshore Installations

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Barge (1%) Barge (1%) Spar (2%) Spar (2%) TLP (8%) TLP (8%) Jackup Jackup (11%) (11%) Semi Semi (26%) (26%) FPSO FPSO (52%) (52%) Asia (20) North Sea (14) West Africa (10)

Around 140 Operational Floating

Production Units

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Floating Platforms for Deepwater Development

(> 500m, 2004 onward)

Location Type of Floating Platform Number USA (GoM) Semi-submersible TLP Spar 3 3 7

South America FPSO

Semi-Submersible

10

2

Asia Pacific FPSO TLP 2 1 (West Seno-Unocal) West Africa FPSO TLP FSO 11 1 1 Source: Offshore Engineer, April’2005

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FPSO

F

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Characteristics of FPSO

• Large storage capacity

• Large topside area • Proven offloading

• ‘Fast track’ development • Re-usability

• Proven floating concept – (ship-shaped platform)

Rules and Regulations

FPSO = Ship ?

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RULES AND REGULATIONS FOR FPSO

Operation mode National Authority (Coastal State) Voyage mode International Regulation Flag State •SOLAS •MARPOL •Loadline •Tonnage Class Class. Societies (LR, ABS, DnV, etc.)

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CLASS RULE BASED ASSESSMENT

• LR Rules and Regulations for the Classification of Floating Offshore Installation at a Fixed

Location, July 1999.

• LR Rules: LR Rules and Regulations for the Classification of Ships, July 2004.

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Some Key Points

• Site-specific environmental conditions

• Cross-reference with the ship rules (scantlings) • Verification through first principal

approach/Model tests

– Hydrodynamic analyses/Model Tests – FEA (SDA)

– Fatigue Assessment (FDA)

• Other recognise codes/standards • Continuously developed

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Site

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Specific Environmental Conditions

• Water depth

• Wind • Wave • Current

• Temperature

• Sea bed/soil conditions • Marine growth

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100 Year Wave Contours

Hs

2 6 10 14 18 22 26 30 4 6 8 10 12 14 16 18 20 20 4

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Hull Assessment

• Structural Arrangements • Longitudinal Strength

• Hull Deflections and Accelerations • Structural Analysis

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Structural Arrangement

Ballast tanks • Tank arrangement

• Double sides/double bottom

• Accommodation fwd/aft

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Hull longitudinal strength

Maximum hogging

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0 50 100 150 200 250 D i s tan ce f ro m A f t P e rp e n d i cu l ar (m ) B e ndi ng M o m e n t D e e p D r a ft L R Ru le Lig h t D r a ft

Site

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0 50 100 150 200 250

D istance from Aft Perpendicular (m)

S h ea r F o r ce Deep Draft 100 Year Light Draft LR Ru le

Site

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Hull Bending Moment Capacity

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Deck Structures Deflections

•Elongation range for fatigue calculation

•Minimum (-) and maximum (+) deformations

Rigid Values increased _Rigid

BM

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Hull Accelerations

100year Criteria, Vessel Heading Sensitive

Trans. Trans. 0.20g 0.20g 0.20g0.20g 0.25g0.25g Long. Long. 0.40g 0.35g 0.45g0.40g 0.35g 0.45g Vert. Vert. 1.90g 1.30g 2.10g1.90g 1.30g 2.10g

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FEA Cargo Tank

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Turret Integration

–

FE Stress Plot

Loading

* Mooring system and risers * Hull girder SF & BM

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Topside Support

Gravity loading

Hull motions

Hull girder

stresses

Hull girder

deflections

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Sloshing

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Non

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Model Testing

• Analysis Calibration

– vessel motion (roll damping) – hull girder loads

• Greenwater, Slamming/Wave Impact • Mooring/Riser design

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Green Seas, Pitch, Sagging & Hogging

1

1 22

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Bow slamming Bow slamming

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MOORING ASSESSMENT

• Environmental Conditions • Design Aspects • Design Analysis • Material Aspects

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Mooring Configurations

Heidrun Heidrun

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YOKE MOORING

Sea Eagle

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SPREAD MOORING

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EXTERNAL TURRET MOORING

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Turret Mooring Systems

Large Internal Turret Small Internal Turret Riser Turret

Mooring

External Turret Mooring Buoyant

Turret

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MOORING COMPONENTS

Chain Wire rope

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Mooring Analysis

• Mean, Low- and Wave frequencies

• Wind, wave and current combinations

100 year waves + 100 year wind + 10 year current 100 year waves + 10 year wind + 100 year current

• Cross reference with API 2SK for fatigue assessment

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Wind, wave and current directions

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Crack in Transverse Web Frame

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Wire Rope Problems

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Anchor Chain Problems

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CLOSING REMARKS

• FPSO concept is by far the most popular floating offshore installations

• Class rules are a proven ‘performance standard’ for FPSO design

• FPSO is not simply a tanker with production facility on her deck

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Rules and regulations are

developed to make sure that

people don’t repeat mistakes !!

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Oepsss !!

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need no checks or some calcs first?

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told ya, my ………….. ssssssshh !!

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Thank you !!

iwan.aryawan@lr.org