Refrigeration – Processes – Congealing flowable material – e.g. – ice making
Patent
1981-12-21
1983-11-22
King, Lloyd L.
Refrigeration
Processes
Congealing flowable material, e.g., ice making
62293, F25C 100
Patent
active
044161182
ABSTRACT:
Temporary plugs are formed in fluid transmission lines by circulating cryogenic fluid through a housing disposed on the exterior of the line to freeze a slug of liquid within the interior of the line. Flow of cryogenic fluid is controlled by sensing the temperature on the surface of the line and sensing the temperature in a housing vent line to indicate a predetermined maximum level of liquid. A temperature sensing and control apparatus is provided which includes dual temperature signal receiving and comparator circuits for operating control valves to open and close at minimum and maximum temperature set points. The control circuitry is operable to open and close the cryogenic fluid control valve in response to variation of the sensed temperature above or below the limit temperatures and in response to a change in temperature indicating an excess level of liquid cryogenic fluid in the chamber formed around the transmission line.
REFERENCES:
patent: 3742723 (1973-07-01), Grise
patent: 3926006 (1975-12-01), Brooks et al.
patent: 4112706 (1978-09-01), Brister
patent: 4220012 (1980-09-01), Brister
patent: 4267699 (1981-05-01), Bahrenburg
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