fundamentals of s-lay and engineering analysis using offpipe- gep
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Fundamentals of S-lay and Engineering Analysis using
OFFPIPEBy JBEIL Subsea Engineers Pvt. Ltd. – Oil & Gas Trainings
www.globalenergypanel.com
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• INTRODUCTION ABOUT OFFSHORE PIPELINE INSTALLATION
• OFFPIPE
• OFFSHORE PIPELINE INSTALLATION ANALYSIS
• CASE STUDY
Contents
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INTRODUCTION ABOUT OFFSHORE PIPELINE
INSTALLATION
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• Steel Pipe
• Corrosion
Coating• Concrete
Coating
•
Cutback• Field Joint
I. INTRODUCTION
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I. INTRODUCTION
J-Lay S-Lay Reel-Lay
Pipeline Tow
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I. INTRODUCTION
OFFSHORE PIPELINE INSTALLATION
Offshore pipeline installation is performed by specialized lay-vessels. There are several methods to install a
pipeline, the most common methods being S-lay, J-lay and reeling.
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I. INTRODUCTION
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I. INTRODUCTION
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I. INTRODUCTION
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I. INTRODUCTION
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I. INTRODUCTION
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PIPELAY BARGE
I. INTRODUCTION
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TENSIONER
I. INTRODUCTION
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STINGER
I. INTRODUCTION
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S-LAY CONFIGURATION
Touch Down Point
I. INTRODUCTION
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I. INTRODUCTION
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I. INTRODUCTION
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I. INTRODUCTION
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I. INTRODUCTION
STARTSTART UPUP
•Dead-man Anchor
•Elevated Hold Back
•Bow String
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I. INTRODUCTION
Dead-man Anchor Start up
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I. INTRODUCTION
Elevated Hold Back Start up
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I. INTRODUCTION
Bow string Start up
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ALLOWABLE STRESSES - Static
Overbend
Parameter On Barge On Stinger Sagbend
Allowable Stress 85% SMYS 72% SMYS 72% SMYS
Applicable code : DNV OS F101
I. INTRODUCTION
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OFFPIPE
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OFFPIPE is a finite element method based computer program. It has been developed specifically for
the modeling and structural analysis of nonlinear problems encountered in the installation and
operation of offshore pipelines.
Analysis capabilities include:
• Static and dynamic pipe laying analyses for many laybarge and stinger configurations, both
conventional and J-lay.
• Pipelay initiation, abandonment and recovery analyses;
• Calculates static pipe stresses, span lengths and deflections for irregular seabed scenarios;
• Static davit-lift analyses for conventional riser installations and subsea tie-ins
OFFPIPE
II. OFFPIPE
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The loads that are considered in the analyses are as follows:
1. Uniformly distributed pipeline self-weight including coatings.
2. Constant barge tension.
3. External hydrostatic pressure due to water column.
4. Reaction forces from the barge rollers
5. Vertical seabed reaction
OFFPIPE
II. OFFPIPE
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The pipeline and the barge are modeled as follows:
1. Lay barge is modeled from the center of the first station up to the last roller on the barge
stern then to the last roller of the stinger.
2. Lay barge is modeled through the input of the horizontal coordinates of the barge rollers and
vertical coordinates or the barge radius to form a smooth pipeline profile on the barge.
3. All roller supports are modeled in terms of simple supports that resist only the downwarddisplacement of the pipeline or cable. The pipeline or cable is free to lift off from the
support when appropriate.
4. The friction force of the barge roller is very minimal if compared to the applied tension.
Thus, for the purpose of analysis, the effect of frictional resistance between rollers and
pipeline has been ignored.
5. The properties of steel pipeline are assumed to be linear, therefore constant modulus ofelasticity has been introduced.
6. Pipeline or cable is divided into a finite number of elements.
7. The seabed is modeled as a discrete elastic foundation.
OFFPIPE
II. OFFPIPE
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COORDINATES IN OFFPIPE
X coordinate is the water surface direction
Y Coordinate is vertical direction
Z coordinate is lateral direction of the barge
Coordinate (0,0,0) is positioned at the stern ofthe barge (at seawater surface level)
II. OFFPIPE
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TRIM AND OFFSET
Trim angle is the angle between the barge
deck and seawater surface due to the barge
rotation in the Z coordinate
Offset is the distance of barge movement in
the X, Y, Z direction which is measured from
the original position of the barge.
Offset usually is used for abandon and
recovery and lifting analysis.
II. OFFPIPE
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CREATE NEW INPUT FILE
II. OFFPIPE
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Input / Output / Heading Data
For pipeline installation analysis, the field “HEAD” and “PRINT” should be defined.
II. OFFPIPE
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HEAD Screen
Input / Output / Heading Data
Problem input/output units :
“1” : English unit
“2” : SI unit
II. OFFPIPE
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PRIN Screen
Input / Output / Heading Data
II. OFFPIPE
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PRIN Screen
Input / Output / Heading Data
“1” means that the parameter shall be calculated and displayed in the OFFPIPE output,
“0” means that the parameter shall not be calculated and displayed in the OFFPIPE output (will be the same
if the field is left blank)
II. OFFPIPE
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Pipe and A&R Cable Data
“PIPE” and “COAT” field should be defined.
“CABL” is defined for the pipelay initiation and abandon and recovery analysis.
II. OFFPIPE
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Pipe and A&R Cable Data
PIPE – Pipe Properties
Pipeline length is defined for pipeline initiation only. Pipeline length indicates the pipeline length on the
barge which is measured from the first support position.
II. OFFPIPE
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Pipe and A&R Cable Data
COAT – Coating Properties
II. OFFPIPE
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Pipe and A&R Cable Data
COAT – Coating Properties
II. OFFPIPE
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Pipelay Vessel Data
“TENS” and “BARG” field should be defined for pipelay, abandon and recovery analysis.
For Davit lifting analysis, “DAVI’ should be defined, and the “TENS” is not defined.
II. OFFPIPE
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Pipelay Vessel Data
BARG – Barge Data and Geometry
Number of station is used to specify the number of the pipe nodes on the barge (include rollers and
tensioner). For davit lifting analysis, number of station is used to specify the number of davit lift.
The laybarge trim angle is the angle between the deck and the water surface.
II. OFFPIPE
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Pipelay Vessel Data
BARG – Barge Data and Geometry
“More -> Support Data” (Pipe Support Data and Geometry)
Note: * Davit Spacing is defined for davit lifting analysis only.
Horizontal distance of the
support (X), measured from the
stern of the barge. The X = 0 is
selected at the stern of the
barge.
Vertical distance or
height of support on
barge (Y), measured
from the deck of the
barge.
Support type:
“1” : Simple pipe support
“2” : Pipe tensioner/winch
II. OFFPIPE
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Pipelay Vessel Data
TENS – Tension
II. OFFPIPE
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Pipelay Vessel Data
TENS – Tension
II. OFFPIPE
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Stinger Data
II. OFFPIPE
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Stinger Data
STIN – Stinger Data and Geometry
II. OFFPIPE
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Stinger Data
STIN – Stinger Data and Geometry
“More -> Support Data (Support configuration on Stinger)”
Horizontal distance of the
support on stinger (X),
measured from stern of the
barge. Since the stinger
position is behind the stern,the negative value shall be
applied in this distance.
Vertical distance or height of
support on stinger (Y),
measured from surface water
elevation. Negative value
indicates the support positionis under the surface water
elevation.
II. OFFPIPE
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Sagbend and Seabed Data
“GEOM”, “SOIL”, and “CURR” should be defined for pipeline installation analysis.
II. OFFPIPE
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Sagbend and Seabed Data
GEOM – Sagbend Pipe Geometry Data
Sagbend element length is defined to determined the distance between nodes at the sagbend region.
The selected water depth is the maximum water depth, considering wave, tidal, and storm surge condition.
“X Coord. Of Free End” field is only defined for davit lifting analysis
II. OFFPIPE
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Sagbend and Seabed Data
SOIL – Seabed Soil Properties
II. OFFPIPE
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Sagbend and Seabed Data
SOIL – Seabed Soil Properties
This field is used to define the lateral friction of the soil.
II. OFFPIPE
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RUN / END / Misc. Data
II. OFFPIPE
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RUN / END / Misc. Data
II. OFFPIPE
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OFFPIPE RUN AND RESULT
Run the File
II. OFFPIPE
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Offpipe Result
OFFPIPE RUN AND RESULT
II. OFFPIPE
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Offpipe Result
OFFPIPE RUN AND RESULT
II. OFFPIPE
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Offpipe Result
OFFPIPE RUN AND RESULT
II. OFFPIPE
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Offpipe Result
OFFPIPE RUN AND RESULT
II. OFFPIPE
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Offpipe Result
OFFPIPE RUN AND RESULT
II. OFFPIPE
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Offpipe Result
OFFPIPE RUN AND RESULT
II. OFFPIPE
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II. OFFPIPE – Dynamic Analysis
J. Ray McDermott – Jebel Ali, Dubai
Modes of Motion
Linear
• Heave
• Surge
• Sway
Rotational
• Pitch• Roll
• Yaw
Oscillatory
• Heave
• Pitch
• Roll
Non-oscillatory
• Surge• Sway
• Yaw
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Wind Loading
Wind is treated as a Time-Invariant Environment
Force, 2
2
1
w D AU C f
Density of Air
A = Structure Projected Area normal to the wind flow
Uw
= mean wind velocity, generally taken at an
elevation of 10 m from the water surface
CD is the Wind Drag Coefficient
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Current Loading
Force2
2
1 AU C f D
fluid density
A = structure projected area normal to the flow
U = uniform flow velocity
CD is the Drag Coefficient.
Equation is similar to Wind Loading
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Waves
Sea comprises a myriadof waves.
Irregular or Randomwave is changing it’sform from time to time
It is a superposition ofmany simple, regular,
harmonic wavecomponents.
I l S
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J. Ray McDermott – Jebel Ali,
Dubai
Irregular Seaway
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J. Ray McDermott – Jebel Ali,
Dubai
Wave Spectra
Wave Energy ≈ Amplitude2
Intensity of the sea ischaracterized by it’s totalEnergy
Wave Energy Spectrum orWave Spectrum shows how thetotal energy of sea isdistributed according to the
frequencies of the various wavecomponents
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Wave Spectra
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J. Ray McDermott – Jebel Ali,
Dubai
Spectrum Models
Pierson Moskowitz
Bretschneider
ISSC
ITTC
JONSWAP
Ochi
II OFFPIPE
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II. OFFPIPE
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III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
USING OFFPIPE
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III OFFSHORE PIPELINE INSTALLATION ANALYSIS
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PIPELAY INITIATION ANALYSIS
III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
• Pipeline initiation is performed at the start-up water depth.
• Pipeline initiation is usually performed using DMA (Dead Man Anchored) Method.
• During pipeline initiation the pullhead at the end of pipeline is connected with the cable.
• During pipeline initiation activity, the pipe joint is added on the barge and welded until the pipeline
profile touch the seabed.
• The barge tension is maintained in order to result the acceptable stresses.
Pipeline Initiation Activity is performed by considering the increasing of pipeline length due to the pipe joint
addition. The considered case for pipeline initiation are given below.
• Pullhead position after tensioner
• Pullhead position near to the barge stern
• Pullhead position at the stinger
• Pullhead position just after the stinger
• Pullhead position at the sagbend region
• Pullhead position prior to rest on seabed
• Pulhead position resting on the seabed
III OFFSHORE PIPELINE INSTALLATION ANALYSIS
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III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
PIPELAY INITIATION ANALYSIS
The offpipe calculation is performed
for several times (depend on the
number of the case), by changing the
pipeline length value.
III OFFSHORE PIPELINE INSTALLATION ANALYSIS
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III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
PIPELAY INITIATION ANALYSIS - CASES
III OFFSHORE PIPELINE INSTALLATION ANALYSIS
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III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
PIPELAY INITIATION ANALYSIS - SUMMARY
III OFFSHORE PIPELINE INSTALLATION ANALYSIS
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III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
• Normal pipelay is performed at the various water depth in order to get the applied tensions and bargeconfiguration during installation activity.
• If any variation of wall thickness and coating parameters is applied along the pipeline route, static
installation analysis should be performed based on this wall thickness and coatings variation
NORMAL PIPELAY ANALYSIS
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III OFFSHORE PIPELINE INSTALLATION ANALYSIS
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III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
NORMAL PIPELAY ANALYSIS – CASE
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III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
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III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
NORMAL PIPELAY ANALYSIS – SUMMARY
III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
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III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
ABANDON AND RECOVERY ANALYSIS
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III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
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ABANDON AND RECOVERY ANALYSIS – CASES
III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
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ABANDON AND RECOVERY ANALYSIS – OFFPIPE INPUT LIST
III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
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87INTRODUCTION OF OFFPIPE
ABANDON AND RECOVERY ANALYSIS – OFFPIPE OUTPUT LIST
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III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
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89INTRODUCTION OF OFFPIPE
ABANDON AND RECOVERY ANALYSIS – OFFPIPE OUTPUT LIST
III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
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90INTRODUCTION OF OFFPIPE
ABANDON AND RECOVERY ANALYSIS – OFFPIPE OUTPUT LIST
III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
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91INTRODUCTION OF OFFPIPE
ABANDON AND RECOVERY ANALYSIS – OFFPIPE OUTPUT LIST
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III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
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94INTRODUCTION OF OFFPIPE
ABANDON AND RECOVERY ANALYSIS – OFFPIPE OUTPUT LIST
III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
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ABANDON AND RECOVERY ANALYSIS - SUMMARY
III. OFFSHORE PIPELINE INSTALLATION ANALYSIS
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Other Advanced Uses of OFFPIPE
• Single Point Lift
• Multi Point Davit Lift Analysis
• Midline Tie-in Analysis
• Riser analysis
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Disclaimer
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The information contained in these course/notes has been compiled from various sources and is
believed to be reliable and to represent the best current knowledge and opinion relative to the
subject.
Global Energy Panel offers no warranty, guarantee or representation as to its absolute
correctness or sufficiency.
Global Energy Panel has no responsibility in connection therewith; nor should it be assumed
that all acceptable safety and regulatory measures are contained herein, or that other or
additional information may be required under particular or exceptional circumstances.
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