Process for delivering liquid cryogen

F - Mech Eng,Light,Heat,Weapons – 17 – D

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F17D 1/08 (2006.01) F17C 7/02 (2006.01) F17C 9/00 (2006.01)

Patent

CA 1164784

Process for Delivering Liquid Cryogen Abstract of the Disclosure A process for delivering a liquid cryogen to a use point in an essentially liquid phase at an about constant flow rate in the range of about 1 to about 40 pounds per hour, said use point having a variable internal pressure drop, comprising the following steps: (i) providing said liquid cryogen at a line pressure in the range of about 4 to about 10 times the maximum use point operating pressure; (ii) subcooling the liquid cryogen of step (i) to an equilibrium pressure of no greater than about one atmosphere while maintaining said line pressure; (iii) passing the liquid cryogen of step (ii) through a device having a flow coefficient in the range of about 0.0002 to about 0.005 while cooling said device externally to a temperature, which will maintain the liquid cryogen in essentially the liquid phase; and (iv) passing the liquid cryogen exiting the device in step (iii) through an insulated tube having an internal diameter in the range of about 0.020 inch to about 0.200 inch to the use point. S P E C I F I C A T I O N - 1 -

405895

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