Patent ID: 9657986
Date: 2017-05-23
CPC Classifications: F25J

Claim:
1. A plant for the production of liquid helium comprising: a refrigeration/liquefaction device, the refrigeration/liquefaction device comprising a working circuit in which a working fluid enriched in helium is subjected to a thermodynamic cycle in order to produce liquid helium, the circuit comprising at least one compressor to compress the working fluid and several heat exchangers in order to cool/reheat the fluid to predetermined temperature levels during the cycle; several recovery pipes for recovery of fluid having respective upstream ends which can be selectively joined to respective tanks which are mobile in order to transfer fluid from the tanks to the refrigeration/liquefaction device so that the working circuit is of the open type and selectively collects fluid external to the circuit at the recovery pipes; a first collecting pipe having an upstream end connected to the recovery pipes and a downstream end connected to a fluid storage device capable of feeding the working circuit with working fluid; at least one second collecting pipe; and at least one third collecting pipe, each of the at least one second and at least one third collecting pipes having an upstream end connected to the recovery pipes and a downstream end connected to the working circuit, the downstream ends of the second collecting pipe(s) and third collecting pipe(s) being joined to predetermined separate positions of the working circuit respectively corresponding to separate temperature levels of the working fluid in the working circuit.