Abstract: Taking the design scheme of LNG floating transfer barge as an example,the quantitative risk assessment is carried out for the high-risk scenario of LNG/NG leakage during the LNG transfer operation with 174,000 m³ and 30,000 m³ LNG carriers. The results of flammable vapor cloud diffusion after LNG leakage in different wind directions are superimposed according to the same concentration level,and the safe area for LNG transmission operation is determined accordingly.

Key words: LNG floating transfer barge, LNG/NG leakage, safe operation area, quantitative risk assessment