| 摘要 |
<p>PURPOSE:To shorten the time of prerefrigeration by using a system in which the direction of nozzle of a spray nozzle machine can be controlled and a necessary position of a liquefied gas tank can be prerefrigerated prior to the loading of the liquefied gas. CONSTITUTION:Liquefied gas is sprayed into a tank 6 from a sparay nozzle machine 5 in order to prerefrigerate the tank 6. The direction of nozzle of the spray nozzle machine is controlled by a control box set on the deck in such a way that refrigeration is focused on positions to be refrigerated, or the joint 11 between a tank supporter 10 and the tank 6 and the bottom portion. Then, the necessary portion of the tank is prerefrigerated prior to the loading the stored gas, and the prerefrigeration is continued in keeping with the loading work. Thus, the time of prerefrigeration can be shortened.</p> |
