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Analysis of Duplex Yoke Mooring System for Tandem Offloading of LNG

[+] Author Affiliations
Yonghui (Allen) Liu, L. Terry Boatman

FMC Technology Energy System, Houston, TX

Paper No. OMAE2005-67119, pp. 265-272; 8 pages
  • ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
  • 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 1, Parts A and B
  • Halkidiki, Greece, June 12–17, 2005
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4195-2 | eISBN: 0-7918-3759-9
  • Copyright © 2005 by ASME


The technology for transferring LNG between two floating vessels offshore is a crucial component in floating LNG facilities now in the planning stage. A duplex yoke mooring system and conventional boom-to-tanker LNG offloading arms were recently developed to carry out tandem offloading of LNG in open sea areas with significant wave heights up to 5.5 meters. This paper will present a methodology to evaluate the operability of the LNG offloading in severe environments. The relative motions between the FPSO and the carrier were predicted by a frequency-domain method. A series of model tests have been carried out. A good agreement between the predictions and measurements has verified and validated the analysis method and procedures. Berthing operations in seastates with a significant wave height of 3.5 meters were also conducted successfully. Therefore, it can be concluded that the technology of the duplex yoke mooring and boom-to-tanker loading arms is ready to be implemented for a safe and reliable transfer of LNG in harsh open sea environments for LNG facilities.

Copyright © 2005 by ASME



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