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Experimental investigation on dynamic responses of FLNG connection system during side-by-side offloading operation

Lookup NU author(s): Professor Zhiqiang Hu



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


This paper presents an experimental investigation on dynamic responses of the connection system in the FLNG(Floating Liquefied Natural Gas) system during side-by-side offloading operations. A typical side-by-sideconnection system for an FLNG and LNG (Liquefied Natural Gas) carrier that includes 16 hawsers and 6 fendersis adopted. Three typical irregular wave cases are used in the model test. Relationships between relative vesselmotion and the load born by the connection system are obtained, and features of dynamic connection systemresponses are summarized based on the analysis results. The results show that hawsers and fenders at differentlocations are sensitive to different motion patterns; loads on connection systems have distinct dynamicproperties, and snap loading crucial to the safety of offloading processes can be induced. Moreover, for partiallyfilled conditions, sloshing effects on vessel motion and on the connection system are examined. FLNG andLNGC are subjected to large low frequency responses in side-by-side configurations due to hydrodynamicinteractions and sloshing effects. Furthermore, sensitivity analyses of the connection system relative to waveamplitudes and directions are conducted. According to our sensitivity studies, high wave amplitudes can excitepronounced relative motions and large loads on the connection system; heading and oblique waves significantlyaffect spring hawsers in mid-ship areas and breast hawsers in bow and stern areas; and positive shelteringeffects can be obtained when FLNG occupies the weather side.

Publication metadata

Author(s): Zhao D, Hu Z, Chen G

Publication type: Article

Publication status: Published

Journal: Ocean Engineering

Year: 2017

Volume: 136

Pages: 283-293

Print publication date: 15/05/2017

Online publication date: 22/03/2017

Acceptance date: 15/03/2017

Date deposited: 23/03/2017

ISSN (print): 0029-8018

ISSN (electronic): 1873-5258

Publisher: Elsevier


DOI: 10.1016/j.oceaneng.2017.03.034


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