Full Content is available to subscribers

Subscribe/Learn More  >

Deepwater Rigid Spools Slugging Flow Fatigue Design

[+] Author Affiliations
Tao Zhao, Philip Cooper

Intecsea (UK) Ltd., Knaphill, Surrey, UK

Joost Brugmans

Intecsea (Delft) BV, Delft, The Netherlands

Paper No. OMAE2010-20469, pp. 557-564; 8 pages
  • ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering
  • 29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 5, Parts A and B
  • Shanghai, China, June 6–11, 2010
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4913-2 | eISBN: 978-0-7918-3873-0
  • Copyright © 2010 by ASME


Tie-in spools form an important part of any deepwater flowline system. Successful designs have the potential to deliver significant savings in fabrication, transportation and installation costs, whilst protecting project schedules. For multiphase flowlines, slug-induced fatigue damage has emerged as a governing design criterion in recent projects. Spans have become the focus of attention for slug-induced fatigue damage. These may occur at tie-in spools used to connect flowlines in deepwater developments. Conventional piping design software tools are commonly used for rigid spools design. Limitations/disadvantages of conventional tools were identified by comparison with detailed simulation of critical aspects of the design using more advanced numerical simulation tools. Rigorous 3D numerical dynamic analysis was used to simulate gravity variation of the slugs and bubbles, and the dynamic impact effect due to the passage of slugs through bends. Resonance effects of spools exposed to slugging flow were inspected and the cause of spools resonance was investigated. The consequential fatigue damage was computed using a time-domain FEA and rainflow counting algorithm. While conducting slugging flow fatigue FEA, bespoke pipe-soil interaction models were developed to simulate cyclic lateral and vertical resistances of the very soft seabed soils typically found in deepwater fields. A contact technique with nonlinear normal and decoupled bi-axial tangential interactions was implemented using FORTRAN subroutines. The analysis procedures developed are outlined, and typical spool designs are presented. The paper seeks to understand the slugging flow effects to the deepwater spools fatigue design, fatigue design, especially while the spools resonance can not be mitigated, and provide the optimised spool configuration in which the slugging effects are minimised, taking due account of the complexities outlined above.

Copyright © 2010 by ASME



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In