| 摘要 |
<p>PURPOSE:To reduce change in composition of LNG(liquidized natural gas) in a LNG tank by making a LNG receiving piping empty and holding the piping in precooling with leading BOG (vaporized gas) in low temperature generated in a LNG tank into the same. CONSTITUTION:A LNG receiving piping 2 between a receiving valve 5 for LNG and a LNG receiving valve 7 is in full liquid state with LNG, which is withdrawn to a LNG tank 1 and the an like with a LNG recovering pump 11, and the piping is made in empty state. Thereafter, BOG in low temperature generated in the LNG tank 1 is led in from an upper receiving piping 2b of the LNG receiving piping 2, and is sent to a BOG compressor 4 from the LNG receiving piping 2 through a BOG return piping 3b and a BOG exhaust pipe 3a via a bypass piping 9. Then LNG flows in the LNG receiving piping 2 between the receiving valve 5 for LNG and the LNG receiving valve 7 therefore the same is kept in low temperature state.</p> |
