FIELD: aeronautical engineering. SUBSTANCE: in pumping the cryogenic fluid to aircraft tank, vented vapors are directed to service reservoir. In draining liquefied natural gas from transfer lines, vented vapors are directed for pressurization of these lines together with self-pressurizing vapor. In case of probable return of liquefied gas from aircraft tank to service reservoir, vented vapors are directed for pressurization of aircraft tank together with self-pressurizing vapors. Required pressure of vapors in service reservoir is maintained through condensation of these vapors and regulation of supply of liquid to self-pressurizing evaporator. EFFECT: enhanced reliability. 1 dwg
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