sbm - riggs
TRANSCRIPT
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DeepGul f 2007
The Development and Installation of Mechanically
Connected Risers and Pipelines
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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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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.