Rules and Regulations for FPSO

RULES AND REGULATIONS FOR FPSO

Dr. Iwan D. Aryawan Senior Specialist Naval Architect for Floating Structures Workshop Deepwater Technology for Indonesian Water ITS-Surabaya, 22-23 November, 2005

PROGRAM

ITS-Surabaya

• FLOATING OFFSHORE INSTALLATIONS • FPSO CONCEPT • RULES AND REGULATIONS FOR FPSO • RULES BASED ASSESSMENT – Overview – Hull Structures – Positional Mooring • CLOSING REMARKS

Surabaya, 23 November 2005

ITS-Surabaya

FLOATING OFFSHORE INSTALLATIONS

Surabaya, 23 November 2005

Some Driving Factors

ITS-Surabaya

• Water depth • Infrastructures around the field development • The size of the reservoir • Demolition requirement

Surabaya, 23 November 2005

ITS-Surabaya

Floating Offshore Installations

Surabaya, 23 November 2005

ITS-Surabaya

Asia (20) North Sea (14) West Africa (10)

Barge (1%) Spar (2%) TLP (8%) Jackup (11%)

FPSO (52%)

Semi (26%)

Around 140 Operational Floating Production Units Surabaya, 23 November 2005

Floating Platforms for Deepwater Development (> 500m, 2004 onward)

ITS-Surabaya

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 Surabaya, 23 November 2005

ITS-Surabaya

FPSO Floating Production Storage and Offloading

Surabaya, 23 November 2005

Characteristics of FPSO

ITS-Surabaya

• Large storage capacity • Large topside area • Proven offloading • ‘Fast track’ development • Re-usability • Proven floating concept – (ship-shaped platform)

Rules and Regulations FPSO = Ship ? Surabaya, 23 November 2005

RULES AND REGULATIONS FOR FPSO

ITS-Surabaya

Operation mode

National Authority (Coastal State)

Class

Voyage mode

International Regulation Flag State •SOLAS •MARPOL •Loadline •Tonnage

Class. Societies (LR, ABS, DnV, etc.) Surabaya, 23 November 2005

ITS-Surabaya

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.

Surabaya, 23 November 2005

Some Key Points

ITS-Surabaya

• 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 Surabaya, 23 November 2005

Site-Specific Environmental Conditions

ITS-Surabaya

• Water depth • Wind • Wave • Current • Temperature • Sea bed/soil conditions • Marine growth Surabaya, 23 November 2005

100 Year Wave Contours 20

20

ITS-Surabaya

18

16

14

12

Hs 10

8

6

4

4 2 2

6

10

14 TP1

18 2 , i

, TP2

2 , i

, TP3

22 2 , i

26

30 30

Tp Surabaya, 23 November 2005

Hull Assessment

ITS-Surabaya

• Structural Arrangements • Longitudinal Strength • Hull Deflections and Accelerations • Structural Analysis • Model Tests

Surabaya, 23 November 2005

ITS-Surabaya

Structural Arrangement

Ballast tanks

• • • •

Tank arrangement Double sides/double bottom Accommodation fwd/aft Topside facilities location Surabaya, 23 November 2005

ITS-Surabaya

Surabaya, 23 November 2005

Hull longitudinal strength

ITS-Surabaya

Maximum hogging

Maximum sagging

Surabaya, 23 November 2005

Site-specific bending moment

LR Ru le

Bending M om ent

ITS-Surabaya

D eep D r a ft

Lig h t D r a ft

0

50

100

150

200

250

D i s tan ce fro m A ft Pe rp e n d i cu l ar (m )

Surabaya, 23 November 2005

100 Year Deep Draft

LR Ru le

Shear Force

ITS-Surabaya

Site-specific shear force

Light Draft

0

50

100

150

200

250

D istance from Aft Perpendicular (m)

Surabaya, 23 November 2005

ITS-Surabaya

Hull Bending Moment Capacity

Surabaya, 23 November 2005

ITS-Surabaya

Deck Structures Deflections •Elongation range for fatigue calculation •Minimum (-) and maximum (+) deformations BM Rigid

Values increased

Rigid

Surabaya, 23 November 2005

Hull Accelerations

ITS-Surabaya

100year Criteria, Vessel Heading Sensitive

Trans.

0.20g

0.20g

0.25g

Long.

0.40g

0.35g

0.45g

Vert.

1.90g

1.30g

2.10g

Due to rigid-body 6DOF components Surabaya, 23 November 2005

ITS-Surabaya

FEA Cargo Tank

Surabaya, 23 November 2005

ITS-Surabaya

Turret Integration – FE Stress Plot

Loading * Mooring system and risers * Hull girder SF & BM * Internal/external pressure

Surabaya, 23 November 2005

ITS-Surabaya

Topside Support „ „ „

„

Gravity loading Hull motions Hull girder stresses Hull girder deflections

Surabaya, 23 November 2005

ITS-Surabaya

Sloshing

Surabaya, 23 November 2005

ITS-Surabaya

Non-linear FEA

Surabaya, 23 November 2005

Model Testing

ITS-Surabaya

• Analysis Calibration –

vessel motion (roll damping)

–

hull girder loads

• Greenwater, Slamming/Wave Impact • Mooring/Riser design • FPSO/Shuttle tanker interaction

Surabaya, 23 November 2005

ITS-Surabaya

Green Seas, Pitch, Sagging & Hogging

1

2

3

4 Surabaya, 23 November 2005

ITS-Surabaya

Bow slamming

Surabaya, 23 November 2005

MOORING ASSESSMENT

ITS-Surabaya

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

Surabaya, 23 November 2005

ITS-Surabaya

Mooring Configurations

Heidrun Surabaya, 23 November 2005

ITS-Surabaya

YOKE MOORING

Sea Eagle Surabaya, 23 November 2005

ITS-Surabaya

SPREAD MOORING

Surabaya, 23 November 2005

ITS-Surabaya

EXTERNAL TURRET MOORING

Whakaaropai Surabaya, 23 November 2005

Turret Mooring Systems

ITS-Surabaya

Internal

Large Internal Turret

Buoyant Turret Mooring

External

Small Internal Turret Riser Turret Mooring

External Turret Mooring Submerged Turret Production

Surabaya, 23 November 2005

ITS-Surabaya

Surabaya, 23 November 2005

ITS-Surabaya

MOORING COMPONENTS

Chain Wire rope

Surabaya, 23 November 2005

ITS-Surabaya

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

Surabaya, 23 November 2005

ITS-Surabaya

Wind, wave and current directions

Surabaya, 23 November 2005

ITS-Surabaya

What could go wrong…?

Surabaya, 23 November 2005

ITS-Surabaya

Crack in Transverse Web Frame

Surabaya, 23 November 2005

ITS-Surabaya

Wire Rope Problems

Surabaya, 23 November 2005

ITS-Surabaya

Anchor Chain Problems

Surabaya, 23 November 2005

ITS-Surabaya

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

Surabaya, 23 November 2005

ITS-Surabaya

Rules and regulations are developed to make sure that people don’t repeat mistakes !!

Surabaya, 23 November 2005

ITS-Surabaya

We got a problem here !! Surabaya, 23 November 2005

ITS-Surabaya

No worry mate, this is a small job !! Surabaya, 23 November 2005

ITS-Surabaya my ‘engineering judgement’ always works !! Surabaya, 23 November 2005

ITS-Surabaya

Oepsss !! Surabaya, 23 November 2005

ITS-Surabaya

Don’t worry mate, we got a bigger truck !! Surabaya, 23 November 2005

ITS-Surabaya Told ya, my engineering judgement always works !! Surabaya, 23 November 2005

ITS-Surabaya You sure it will work for this one as well? ……..Yup!! Surabaya, 23 November 2005

ITS-Surabaya need no checks or some calcs first? ……..nope…just trust me will ya!! Surabaya, 23 November 2005

ITS-Surabaya

told ya, my ………….. ssssssshh !! Surabaya, 23 November 2005

ITS-Surabaya

Thank you !! [email protected]

Surabaya, 23 November 2005