Kevin Mullen, INTECSEA: Subsea Developments for FLNG Production
02 FEA in Pipeline Design using Ansys at INTECSEA -...
Transcript of 02 FEA in Pipeline Design using Ansys at INTECSEA -...
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Finite Element Analysis in Pipeline Design Finite Element Analysis in Pipeline Design
using Ansys at INTECSEAusing Ansys at INTECSEA
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Agenda:Agenda:
••IntroductionIntroduction
••Lateral BucklingLateral Buckling
••Pipeline WalkingPipeline Walking
••Free Span Detailed AnalysisFree Span Detailed Analysis
••OnOn--Shore Installation AnalysisShore Installation Analysis
••Structural DesignStructural Design
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IntroductionIntroduction
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“Global buckling is a response to compressive effective axial force and global buckling reduces the axial
carrying capacity. Pipelines exposed to potential global buckling are then either those with high effective
axial compressive forces, or pipelines with low buckling capacity, typically light pipelines with low lateral
pipe-soil resistance.” DNV-RP-F110
Lateral Buckling AnalysisLateral Buckling Analysis
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Lateral Buckling AnalysisLateral Buckling Analysis
Exposed Pipeline on Even Exposed Pipeline on Even
Seabed Seabed -- DNVDNV--RPRP--F110F110
ANSYS Routine PackageANSYS Routine Package
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Lateral Buckling AnalysisLateral Buckling Analysis
INPUT:INPUT:
•• Pipe propertiesPipe properties
•• Temperature e Pressure ProfileTemperature e Pressure Profile
•• Boundary ConditionsBoundary Conditions
•• Soil ParametersSoil Parameters
MODEL:MODEL:
••PIPE288 elementPIPE288 element
••Pipe soil interaction: Pipe soil interaction:
* Seabed: TARGE170* Seabed: TARGE170
* Pipe: CONTA175* Pipe: CONTA175
RESULT:RESULT:
•• Export axial force, internal pressure and Export axial force, internal pressure and
bending momentbending moment
•• Assess the Load Controlled Condition Assess the Load Controlled Condition
Check as per DNVCheck as per DNV--OSOS--F101F101
•• Plastic Strain can also be exported and Plastic Strain can also be exported and
used in the calculation of Displacement used in the calculation of Displacement
Controlled Condition Check as per DNVControlled Condition Check as per DNV--
OSOS--F101F101
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“Pipeline walking can occur for short free-ended pipelines subjected to cyclic loading. Pipeline walking
is a phenomena in which start-up / shut-down cycles cause a ratcheting response in the pipeline axial
displacement. Over a number of cycles this ratcheting can lead to very large global axial displacement
with associated overload of jumper or spool pieces.” SAFEBUCK
Pipeline WalkingPipeline Walking
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Pipeline WalkingPipeline Walking
There are three main mechanisms which drive pipeline walking:
•Thermal gradients during heat-up
•Seabed slope
•Riser tension
0
10
20
30
40
50
60
70
80
0 500 1000 1500 2000 2500 3000 3500 4000
KP (m)
Tem
pe
ratu
re (
ºC)
1st Transient 2nd Transient 3rd Transient 4th Transient Full Temperature
Seabed Elevation (m)
-1800
-1600
-1400
-1200
-1000
-800
-600
-400
-200
0
0 6000 12000 18000 24000 30000 36000 42000
KP (m)
Wate
r D
ep
th (
m)
Rig moveRig move
Riser Tension ForceRiser Tension Force
RiserRiser--Flowline ConnectionFlowline Connection
RiserRiser
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-0.2
-0.15
-0.1
-0.05
0
0.05
0 500 1000 1500 2000 2500 3000 3500 4000
Distance along pipeline (m)
Rela
tive A
xia
l D
isp
lacem
en
t (m
)
1st Cooldown
2nd Cooldown
3rd Coo ldown
4th Coo ldown
5th Coo ldown
Pipeline WalkingPipeline Walking
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Free Span AnalysisFree Span Analysis
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DNVDNV--RPRP--F105F105
In ANSYS, we basicallyIn ANSYS, we basically
calculate the mode shape calculate the mode shape
and the natural frequency.and the natural frequency.
Free Span Analysis Free Span Analysis
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“The free span analysis may be based on approximate response expressions or a refined FE“The free span analysis may be based on approximate response expressions or a refined FE
approach depending on the free span classification and response type, see Sec.6.” DNVapproach depending on the free span classification and response type, see Sec.6.” DNV--RPRP--F105F105
Approximate Response AnalysisApproximate Response Analysis
Free Span Analysis Free Span Analysis
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Free Span Analysis Free Span Analysis
-263.00
-261.00
-259.00
-257.00
-255.00
-253.00
-251.00
12003 12103 12203 12303 12403 12503 12603
KP (m)
Wate
r depth
(m
)
Seabed Profile Pipeline Profile
300m300m
Adjacent Length Adjacent Length
Critical Span
-0.20
0.00
0.20
0.40
0.60
0.80
1.00
1.20
201875 201975 202075 202175 202275 202375 202475
KP (m)
Mo
de s
hap
e
-356
-354
-352
-350
-348
-346
-344
-342
-340
-338
Wate
r d
ep
th (
m)
Mode Shape Seabed Profile Pipeline Profile
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Free Span Analysis Free Span Analysis
-263.00
-261.00
-259.00
-257.00
-255.00
-253.00
-251.00
12003 12103 12203 12303 12403 12503 12603
KP (m)
Wate
r depth
(m
)
Seabed Profile Pipeline Profile
300m300m
Adjacent Length Adjacent Length
Critical Span
-0.20
0.00
0.20
0.40
0.60
0.80
1.00
1.20
201875 201975 202075 202175 202275 202375 202475
KP (m)
Mo
de s
hap
e
-356
-354
-352
-350
-348
-346
-344
-342
-340
-338
Wate
r d
ep
th (
m)
Mode Shape Seabed Profile Pipeline Profile
-0-0-0-0.2.2.2.2.200000
0.00
0.20
0.40
0.60
0.80
1.00
1.20
201875875201875201875 201975 202075 202175 202275 202375375375
KP (m)
003 12103 12203 12303 12403 12503 12603
KP (m)m)m)
Seabed Profile Pipelinenenene P P Prorororofifififilelelele
300m300300300300m
Adjacent Length Ad Ad Adjacjacjacjacentententent Length
Critical Span
Mo
de s
hap
e
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OnOn--Shore Pipeline InstallationShore Pipeline Installation
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OnOn--Shore Pipeline InstallationShore Pipeline Installation
Analysis steps:Analysis steps:
1.1. Lay the pipe on the rollerLay the pipe on the roller
2.2. Lift the pipeLift the pipe
3.3. Move the pipe laterallyMove the pipe laterally
4.4. Lower the pipeLower the pipe
5.5. Lay the pipe on the rollerLay the pipe on the roller
6.6. Lift the pipeLift the pipe
7.7. Move the pipe laterallyMove the pipe laterally
8.8. Lower the pipeLower the pipe
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OnOn--Shore Pipeline InstallationShore Pipeline Installation
Analysis steps:Analysis steps:
1.1. Lay the pipe on the rollerLay the pipe on the roller
2.2. Lift the pipeLift the pipe
3.3. Move the pipe laterallyMove the pipe laterally
4.4. Lower the pipeLower the pipe
5.5. Lay the pipe on the rollerLay the pipe on the roller
6.6. Lift the pipeLift the pipe
7.7. Move the pipe laterallyMove the pipe laterally
8.8. Lower the pipeLower the pipe
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Client: PETROBRASClient: PETROBRAS
Project: Dutos SergipeProject: Dutos Sergipe
OnOn--Shore Pipeline InstallationShore Pipeline Installation
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Structural DesignStructural Design
#2500 12.75’’ Swivel Flange Design for Camorim #2500 12.75’’ Swivel Flange Design for Camorim
Field in SergipeField in Sergipe
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Structural DesignStructural Design
Riser Clamp Design for Dourado FieldRiser Clamp Design for Dourado Field
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Future Development:Future Development:
•Bottom Roughness Analysis
- Substitute SAGE as our main
Software for this type of analysis
•On-Bottom Stability Analysis
- Assess the anchoring effect of
the stable part of the pipeline
SAGE Profile 3DSAGE Profile 3D
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The EndThe End
Thank you All!Thank you All!