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DeepGul f 2007

The Development and Installation of Mechanically

Connected Risers and Pipelines

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2DeepGulf 2007

U-Shaped Steel Offloading Lines

Existing Steel OOL in U:

AGBAMI, ERHA andGREATER PLUTONIO

Larger OOL Pipe Sizes Studied:

22-inch OOL

24-inch OOL

OOL Distance:

2000 m from FPSO toCALM Buoy

Field:

AGBAMI

Water Depth:

1370 mSteel Offloading

Lines

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OOL Fatigue Evaluation Conditions

Analysis Conditions:

Agbami Field

Stationary FPSO

CALM Buoy Dynamic Motions (20yr Life)

Fatigue Evaluation on CALM Buoy End

100% Occurrence Wind Sea, Swell-1 and Swell-2

S-N Curves DNV E and DNV C

Double-sided weld -ground flushConnector

Single-sidedfield weld

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Buoy Motions and Fatigue

Surge Amplitude Buoy RAOs

0.00

0.50

1.00

1.50

2.00

2.50

0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25

Wave Frequency (rad/sec)

Surgemotio

n(m/m)

Wave @ 160 deg Wave @ 180 deg Wave @ 200 deg

Wave @ 220 degr Wave @ 240 deg Wave @ 260 deg

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S-N Curves and Fatigue Life

Fatigue Life Comparison

(24-inch OOL System)

0

2000

4000

6000

8000

10000

12000

14000

0 200 400 600 800 1000 1200

Distance From Hang-Off (m)

FatigueLife

(Yr.)

DNV "C" Curve

DNV "C1" Curve

DNV "E" Curve

24x 1wt

500m with strakes1-3/8wt for 280m

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S-N Curves and Fatigue Life at Buoy

Fatigue Life Comparison

(24-inch OOL System - At Hang-Off Region)

0

250

500

750

1000

1250

1500

1750

2000

0 30 60 90 120 150 180 210 240 270 300

Distance From Hang-Off (m)

Fatigue

Life

(Yr.)

DNV "C" Curve

DNV "C1" Curve

DNV "E" Curve

Field Weld

200 yr. min.

Connector

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OOL Fatigue Life and Connector vs. Field Weld

Study Results:

22-inch Fatigue Life:

216 Years DNV C1 Connector

22 Years DNV E Field Weld

24-inch Fatigue Life:

228 Years DNV C1 Connector

23 Years DNV E Field Weld

Mechanical Connector Advantages:

Connector has 10X more fatigue life than field welds.

Pipe joints are fabricated onshore with coatings, insulation andNDT. Higher strength or corrosion resistant steels can be used.

Connector make-up is faster and less complicated than welding.

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SCR and OOL Connector Development

Weld-on pin and boxConcentric threadsCannot unscrew orloosen

Sizes: 10-inch orlarger

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Axial Make-up Procedure

Stab pin in boxInstall hydraulic clampHydraulically pressurizebetween threads

Axial clamp make-up

Pressure test

Hydraulic port

Hydraulic clamp

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Connector Make-up

Conical threadcrest-to-crestcontact

Stabbed position

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Pressurization and Clamping

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Connected Position

AbutmentSurface

Metal Seals

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20-inch Connector Qualification

per ISO 21329

Load Case 1

Test matrix for Pipeline

qualification

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Load Case 1 - Make-up Pressurization

6,300 psi (43.4 MPa)

von Mises Stresses

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15DeepGulf 2007

Deep Water Installation Vessel

MV Normand Installer

Loa = 124m

B = 28m

Power = 23MW

BP = 308mT

DP Class3

250T crane

50T crane

350T A-frame

500T winch

400T winch (2x)

200T winch

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Modular J-lay System on Normand Installer

Gimbal

Table

Loader ArmAssy

Stern GimbalTable

PipeHandlingEquipment

Sub SeaElevator

Active gimballing8thru 24PipeTriple J oints (37m).Up to 500te

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Subsea Elevator

Subsea Sheaves,1800mm Dia

Long BellmouthClamp

Collar Clamp

80mm Dia.Wire Ropes

Short BellmouthClamp

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J-Lay Cycle Times

J-LAY CYCLE TIME ANALYSIS

min. 4 8 12 16 20 24 28 32 36 40 44 48 52

Pipe Welding Operation:Clamp Pipe in Erector 1Raise Loader Arm 4

Lower Pipe and Align 2 52 minutesWeld 20NDT 4

Coat 10Release and Lower SS Elevator 4Lower Erector 4Close Upper Clamp 1

Release Lower Clamp 1Raise SS Elevator 1

Close Lower Clamp 1

Mechanical Connector Operation: 22 minutes 30 minutesClamp Pipe in Erector 1Raise Loader Arm 4Lower Pipe and Stab Connector 2Make-up Connector 5

Release and Lower SS Elevator 4Lower Erector 4Close Upper Clamp 1

Release Lower Clamp 1Raise SS Elevator 1

Close Lower Clamp 1

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Day Rate Savings

Day Rate Savings on Normand InstallerConnectors Welding

Cycle Time (min) 22 52

Efficiency 100% 100%

Joints per Day 65 28

Length (m) 37 37

km/day 2.4 1.0

Day Rate Savings/km 58%

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Pipelay with Mechanical Connectors

Summary:

Connectors improve SCR and OOL FatigueLife by a factor of 10X.

ISO 21329 Connector Qualification forPipelines.

Installation using Modular J-lay on theNormand Installer.

Connected Pipelines are Faster and Cheaper.

Enabling Technology for turnkey FPSO, SCR,

OOL and Buoy installation.