System and method for transferring cryogenic fluids

F - Mech Eng,Light,Heat,Weapons – 17 – C

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F17C 5/02 (2006.01) F17C 6/00 (2006.01) F17C 7/02 (2006.01) F17C 9/00 (2006.01) F17C 13/00 (2006.01) F17C 13/04 (2006.01)

Patent

CA 2399194

A system and a method for transferring cryogenic fluids (e.g., LNG) between a first LNG storage tank (41) and a second LNG storage tank (42). The system has two transfer lines (43 and 44) which extend between the tanks and which are fluidly connected together to form a closed loop when the system is not in use. The transfer system includes a means for cooling the transfer lines (43 and 44) when the system is not in use. LNG is circulated at high pressure through the closed loop during idle intervals to keep the lines at a temperature at which LNG will remain in a single phase, i.e. liquid.

La présente invention concerne un système et un procédé de transfert de fluides cryogéniques (par exemples du gaz naturel liquéfié (GNL)) entre une première citerne (41) de stockage de GNL et une seconde citerne (42) de stockage de GNL. Ce système présente deux conduits de transfert (43 et 44) situés entre les citernes, qui sont fluidiquement connectés entre eux de façon à former un circuit fermé lorsqu'on n'utilise pas ce sytème. Ce système de transfert comprend un organe destiné à refroidir les conduits de transfert (43 et 44) lorsqu'on n'utilise pas ce système. On fait circuler le GNL à haute pression à travers ce circuit fermé durant les intervalles d'arrêt de façon à garder les conduits à une température à laquelle le GNL restera dans une seule phase, à savoir la phase liquide.

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