0

Full Content is available to subscribers

Subscribe/Learn More  >

Dynamics of Heavy Deck Lift-Off From Transportation Barge

[+] Author Affiliations
Rahul Kanotra, Mohamed Aboumalwa, Chellakat Joe-Joe, Sajith Nair, Vijoy Koottungal

McDermott Middle East, Inc., Dubai, United Arab Emirates

Paper No. OMAE2012-83458, pp. 391-399; 9 pages
doi:10.1115/OMAE2012-83458
From:
  • ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology
  • Rio de Janeiro, Brazil, July 1–6, 2012
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4488-5
  • Copyright © 2012 by ASME

abstract

The size of present day offshore topsides are growing rapidly, with large capacity, complex modules being transported and lifted offshore. This increase in size results in offshore lift weights which are near crane capacity of HLVs (heavy lift vessels). The offshore installation operation involves lift-off of heavy modules from a transportation barge moored perpendicular to the stern of the HLV. Previous experiences with lift analyses indicate that most significant hook load occurs while the module is being lifted off the transportation barge. This can be attributed to the fact that the crane vessel, topside and the transportation barge are all dynamically coupled together and during the “lift-off” condition the module experiences upward and downward impulsive forces from the transportation barge, which in turn increase the apparent weight of the module and hence the hook loads. This paper studies the dynamics of heavy deck lift-off from the transportation barge, when the sea fastening from the module has been removed and all three bodies (transportation barge, HLV and Module) are mechanically coupled through slings, lashings and fenders. The effect of various crane line pretensions, wave, current and wind has been investigated and the resulting DAFs (dynamic amplification factors) of the hook loads have been compared. The effect of wind and current on the lift operation has also been investigated. The “lift in air” case has been studied and compared with the “lift off” case. Multi Operational Structural Engineering Simulator (MOSES) has been used to carry out 3D time domain analysis of lift off and lift in air cases. McDermott’s HLV, 300 class transport barge and a topside weight of 1,500MT have been analyzed for the study.

Copyright © 2012 by ASME

Figures

Tables

Interactive Graphics

Video

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

NOTE:
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