single hybrid riser under cyclonic loads - subsea uk · cyclones and shr parameter unit 100yr loads...
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Single Hybrid Riser Under Cyclonic Loads
Subsea Expo 2016
February, 2016McDermott International Inc.
© 2016 McDermott International, Inc. All rights reserved.
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Author’s Intro
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Eduardo Decnop – Lead Riser Engineer
Team leader for risers, umbilicals and flexibles in McDermott Epsom UK office.
He has 13 years experience in SURF including in-place and installation
Erich dos Santos – Senior Riser Engineer
Riser Engineer in McDermott Epsom UK office.
He has 8 years experience in risers and moorings analysis.
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SHR Concept
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SHR Concept
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SHR Global Behavior
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SHR Geographical Locations
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SHR Geographical Locations
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Cyclones
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Cyclones
‐2000
‐1800
‐1600
‐1400
‐1200
‐1000
‐800
‐600
‐400
‐200
00 0.5 1 1.5 2 2.5 3 3.5 4
Wat
er D
epth
(m)
Current Velocity (m/s)
Current Profile Comparison
100-yr
10.000-yr Cyclonic
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SHR: Cyclones and SHR
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Cyclones and SHR
10,000-yr loading
100-yr loading
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Cyclones and SHR
Parameter Unit 100yr Loads10,000yr CyclonicCondition
Max LFC Angle deg 11.6 14.9
Max UFC Angle deg 3.5 6.7
LFC Min Tension @ Foundation Connection kN 1467 1960
LFC Max Tension @ Foundation Connection kN 2365 2454
FJ Top Angle deg 19.0 54.2
FJ Max Effective Tension kN 1018 1127
FJ Min Effective Tension kN 77.5 29.1
Max Bend Moment along Riser Linepipe kN.m 554.1 688.7
Max Effective Tension along Riser Linepipe kN 4100 4336
BT Lateral Displacement m 143.2 301.6
Top BT Depth m -214 -235.6
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SHR Solutions: Top Tension
Increase of up thrust force
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SHR Solutions: Deeper B.T.
OrcaFlex 9.8c: D_DC2_F_10000yCurCycl_10000yWaveCycl_H35.39_T15.2.dat (modified 15:28 on 27/01/2015 by OrcaFlex 9.8a)Vertical Current Profile for 10000y_223deg_Cyclonic
Speed (m/s)43210
Z (m
)
0
-500
-1000
-1500
Lower buoyancy tank
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SHR is capable to be installed in harsh cyclonic regions Suitable for deepwater applications Advantage in export lines application Increasing the top tension impacts installation and
construction (cost) Lowering B.T. may impact flexible jumper specification SHR has great advantage compared with other riser solutions
for vessel limited pay-load capacity
SHR Conclusion
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Your questions?
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Slide 3: https://oilandgastechnologies.wordpress.com/2015/08/13/free‐standing‐hybrid‐risers‐fshr/
Slides 4‐5; 9‐14 : ©McDermott International, Inc. – Any reproduction or re‐use must be with prior written consent of McDermott.
Slide 8: http://www.newsofinterest.tv/global_warming/effects/storm_intensity/pdf_cyclones_1900.phphttp://www.greendiary.com/tiny‐aerosols‐soot‐giving‐more‐frequent‐and‐stronger‐winter‐cyclones‐to‐western‐us.html
Slide 6: http://lyrics.wikia.com/wiki/File:World_Map_(Simple).png Slide 7: http://www.learnnc.org/lp/editions/nchist‐recent/6248
References
© 2016 McDermott International, Inc. All rights reserved.