Refrigeration – Low pressure cold trap process and apparatus
Patent
1983-01-28
1984-09-25
Capossela, Ronald C.
Refrigeration
Low pressure cold trap process and apparatus
222383, 417901, F17C 702
Patent
active
044729464
ABSTRACT:
A cryogenic storage tank with a built-in pump for pumping cryogen directly from the primary storage container consistent with low boil-off losses of cryogen has an outer vessel, an inner vessel and an evacuated insulation space therebetween. A pump mounting tube assembly extends into the interior of the inner vessel and includes an inner pump mounting tube and an outer pump mounting tube joined at their lower rims to define an insulating jacket between the two tubes. The inner pump mounting tube is affixed at its upper end to the outer vessel while the outer pump mounting tube is affixed at its upper end to the inner vessel. The inner pump mounting tube defines a relatively long heat path into the cryogenic container and is itself insulated from the liquid cryogen by a pocket of trapped gas formed within the inner pump mounting tube by heated cryogen. A pump may be introduced through the inner pump mounting tube and is also insulated against contact with liquid cryogen by the trapped gas such that only the lowermost end of the pump is immersed in cryogen thereby minimizing heat leakage into the tank.
REFERENCES:
patent: 2888879 (1959-06-01), Gaarder
patent: 2932310 (1960-04-01), Koblish
patent: 3109293 (1963-11-01), Williams et al.
patent: 3212280 (1965-10-01), Thomas et al.
patent: 3220202 (1965-11-01), Gottzmann
patent: 3276214 (1966-10-01), Wilson et al.
patent: 3431744 (1969-03-01), Veilex et al.
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