Patent ID: 8721788

Claim:
A method for charging with liquefied ammonia comprising sequentially: feeding gaseous ammonia in a condenser, converting the gaseous ammonia into a liquefied ammonia in the condenser, and feeding the liquefied ammonia formed in the condenser to a vessel to thereby charge the vessel with the liquefied ammonia; wherein the following process group (A) is carried out between the conversion to the liquefied ammonia and the charge with the liquefied ammonia, or the following process group (B) is carried out after the charge with the liquefied ammonia, or both the two process groups are carried out: [Process group (A)] feeding the liquefied ammonia formed in the condenser to the vessel and cooling the vessel by the latent heat of vaporization of the liquefied ammonia, and feeding the gaseous ammonia formed through vaporization of the liquefied ammonia to the condenser; [Process group (B)] metering the total ammonia amount M 1 existing inside the ammonia-charging apparatus and the ammonia amount M 2 existing inside the ammonia-charging apparatus except the vessel, under the condition of stopping the running of the liquefied ammonia in and out of the vessel, and discharging the liquefied ammonia out of the vessel in an amount corresponding to the difference, M 1 −M 2 −MC, wherein MC is a programmed liquefied ammonia-charging amount in the vessel.