| 摘要 |
PURPOSE:To prevent gasifying of liquefied gas in an inner pipe of a double pipe through utilization of gasification of liquefied gas in an outer pipe thereof, by causing the inner pipe to act as a pipe for transferring liquefied gas and connecting the outer pipe to a valve for discharging gasified gas of liquefied gas. CONSTITUTION:A pipe 1 in form of a double pipe for transferring liquefied gas is connected to a liquefied gas tank 2, and meanwhile, liquefied gas in an inner pipe 11 is fed to a liquefied gas reservoir in a dropping device 3. An outer pipe 12 is provided with a needle valve 4 on its end and the gas evaporated in the outer pipe 12 is released through a needle valve 4. By appropriately discharging gasified gas in the outer pipe 12, the pressure in the outer pipe 12 becomes lower than that in the inner pipe 11, and gasification of liquefied gas matching the reduction in a pressure takes place, resulting in the reduction in temperature by the evaporating latent heat. This prevents gasification of liquefied gas in the inner pipe 11 because of a pressure slightly higher than that in the outer pipe 12. |
