single hybrid riser under cyclonic loads - subsea uk · cyclones and shr parameter unit 100yr loads...

Single Hybrid Riser Under Cyclonic Loads

Subsea Expo 2016

February, 2016McDermott International Inc.

© 2016 McDermott International, Inc. All rights reserved.

Author’s Intro


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.

SHR Concept


SHR Global Behavior


SHR Geographical Locations


Cyclones


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


SHR: Cyclones and SHR


Cyclones and SHR

10,000-yr loading

100-yr loading


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


SHR Solutions: Top Tension

Increase of up thrust force


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

© McDermott International, Inc. All rights reserved.

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


Your questions?

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


single hybrid riser under cyclonic loads - subsea uk · cyclones and shr parameter unit 100yr loads...

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