(6) Risk assessment of LNG and FLNG vessels during manoeuvring in open sea

Nagi Abdussamie ^{a , ∗,} Mohamed Daboos ^b , Ismail Elferjani ^c , Chai Shuhong ^a , Abdusalam Alaktiwi ^b
a National Centre for Maritime Engineering and Hydrodynamics, Australian Maritime College, University of Tasmania, Launceston, Australia

b Marine and Offshore Engineering, Faculty of Engineering, University of Tripoli, PO Box 13275, Tripoli, Libya

c RMIT University, Melbourne VIC 3001, Australia

Received 22 June 2017; received in revised form 25 November 2017; accepted 13 December 2017
Available online 20 December 2017

Abstract
Manoeuvring of a Liquefied Natural Gas (LNG) carrier in open sea at Floating LNG (FLNG) terminals can be associated with several operational risks of potential consequences to human safety, the environment and economy. In this paper, a fuzzy set approach was developed to handle the uncertainty in expert opinions commonly used for qualitative risk assessment studies such as the risk matrix. Risk parameters were modelled using a number of fuzzy sets, and a fuzzy risk value was calculated for several hazardous scenarios at different phases during ship berthing operations. The calculated fuzzy risk values were found to be consistent with the results of the risk matrix technique.
© 2017 Shanghai Jiaotong University. Published by Elsevier B.V.
This is an open access article under the CC BY-NC-ND license. ( http://creativecommons.org/licenses/by-nc-nd/4.0/ )

Keywords: Offshore gas export; Floating gas terminals; Hazards during ship manoeuvring; Fuzzy logic.